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GSLV-F08/GSAT-6A Mission

The next flight of GSLV with indigenous cryogenic stage is scheduled to take place during the fourth quarter of 2017, which will launch the GSAT-6A communication satellite.

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(https://img.novosti-kosmonavtiki.ru/234103.jpg) (http://www.sac.gov.in/server/SacSliderI_Repository/Vyom/English/452/Gsat6A-front.jpg)

GSAT-6A Communication Payload Flagged off

GSAT-6A Communication Payload Flagged Off by Shri.Tapan Misra,Director SAC on November 18,2017.

ЦитироватьVSSC new director Somnath told TOI that his priorities will be on technology upgradation of launch vehicle design and to focus on immediate launches including GSLV-Mark (MK) II and PSLV-C41 in Feb. GSAT -MKII (F09) will be for the launch of communication satellite GSAT-6A

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TIRUCHI, FEBRUARY 23, 2018 00:00 IST
UPDATED: FEBRUARY 23, 2018 03:58 IST

...
Longevity of satellites

The ISRO would launch the GSLV GSAT 6A in the last week of March. ...

ЦитироватьMarch 24      GSLV Mk.2 • GSAT 6A
Launch time: TBD
Launch site: Satish Dhawan Space Center, Sriharikota, India

ЦитироватьGSAT-6A Flagged off to SDSC-SHAR Launch pad on 28th Feb, 2018

(https://img.novosti-kosmonavtiki.ru/230347.jpg) (https://img.novosti-kosmonavtiki.ru/230348.jpg) (https://img.novosti-kosmonavtiki.ru/230349.jpg)(https://img.novosti-kosmonavtiki.ru/230350.jpg)

Цитировать29న నింగిలోకి జీఎస్‌ఎల్‌వీ ఎఫ్‌ 08
Mar 02, 2018, 04:06 IST

(https://img.novosti-kosmonavtiki.ru/218439.jpg)
బెంగళూరు నుంచి షార్‌కు వెళుతున్న జీశాట్‌ 6ఏ ఉపగ్రహం

షార్‌కు చేరుకున్న జీశాట్‌ 6ఏ ఉపగ్రహం

శ్రీహరికోట (సూళ్లూరుపేట): భారత అంతరిక్ష పరిశోధనా సంస్థ(ఇస్రో) శ్రీహరికోటలోని సతీష్‌ ధావన్‌ స్పేస్‌ సెంటర్‌లోని రెండో ప్రయోగ వేదిక నుంచి ఈ నెల 29న జీఎస్‌ఎల్‌వీ ఎఫ్‌ 08 రాకెట్‌ను అంతరిక్షంలోకి పంపనుంది. ఈ ప్రయోగం ద్వారా నింగిలోకి పంపనున్న జీశాట్‌ 6ఏ ఉపగ్రహం గురువారం షార్‌కు చేరుకుంది.

బెంగళూరులోని ఉపగ్రహాల తయారీ కేంద్రం (ఐశాక్‌) నుంచి అత్యంత భారీ భద్రత నడుమ ఈ ఉపగ్రహం షార్‌కు చేరుకుంది. షార్‌లోని క్లీన్‌రూంలో ఉపగ్రహాన్ని భద్రపరిచి శుక్రవారం నుంచి పలు పరీక్షలు చేపట్టనున్నారు. రెండో ప్రయోగ వేదికకు సంబంధించిన రాకెట్‌ అనుసంధాన భవనంలో మూడు దశల రాకెట్‌ అనుసంధానాన్ని పూర్తి చేశారు. గత నెల 20న ఈ ప్రయోగం చేపట్టాలనుకున్నప్పటికీ ఉపగ్రహం షార్‌కు రావడంలో జాప్యం కావడంతో ఈ నెల 29కి వాయిదా వేసినట్లు ఇస్రో శాస్త్రవేత్తలు తెలిపారు.

ЦитироватьРакета GSLV F08 будет запущена 29 марта
Спутник GSAT-6A доставлен из Бенгалуру в Шрихарикоту

Шрихарикота: ISRO отправит ракету GSLV F-08 29-го числа этого месяца со второй стартовой площадки Космического Центра Сатиш-Дхаван в Шрихарикоте. Спутник GSAT-6A, который будет запущен на этой ракете, достиг КЦ в четверг.

Спутник прибыл в КЦ из центра спутникового производства в Бангалоре (ISAC)... Завершена сборка трех ступеней ракеты в здании сборки ракет второй стартовой пллощадки. Ученые ISRO заявили, что запуск запланирован на 29 марта...

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Индийская организация космических исследований (ISRO) готовится к очередному космическому запуску ракеты GSLV F08 24-го числа этого месяца с индийского космодрома Шрихарикота. На 2-й стартовой площадке в здании сборки ракет завершена сборка 3-х ступеней ракеты. Спутник GSAT-6A ISRO запускает для укрепления сети связи в стране. Он рассчитан на работу в течение десяти лет в случае успеха. Учёные проведут серию тестов ... в чистой комнате. После различных испытаний спутник будет установлен наверху ракеты для полёта. Если погода хорошая, ракетка GSLV F08 отправится в полёт 24 марта.
...

Цитировать29న నింగిలోకి జీఎస్‌ఎల్‌వీ ఎఫ్‌08!
Mar 14, 2018, 02:22 IST

(https://img.novosti-kosmonavtiki.ru/218438.jpg)

శ్రీహరికోట (సూళ్లూరుపేట): శ్రీ పొట్టి శ్రీ రాములు నెల్లూరు జిల్లా సూళ్లూరుపేట సమీపంలోని సతీష్‌ ధాలవన్‌ స్పేస్‌ సెంటర్‌ (షార్‌) రెండో ప్రయోగవేదిక నుంచి ఈ నెల 29న జీఎస్‌ఎల్‌వీ ఎఫ్‌08 రాకెట్‌ ప్రయోగిం చేందుకు శాస్త్రవేత్తలు సన్నాహాలు చేస్తున్నారు. ఈ నెల 11న రాకెట్‌ మూడోదశ అయిన క్రయోజనిక్‌ దశ అనుసంధానం పూర్తయింది. దీంతో మూడు దశల రాకెట్‌ అనుసంధానం పనులు పూర్తయ్యాయి.

ఈ మూడు దశల రాకెట్‌ పరీక్షలు నిర్వహించిన అనంతరం ఈనెల 19న రాకెట్‌ శిఖరభాగాన 2,140 కిలోల బరువు కలిగిన జీశాట్‌–6ఏ ఉపగ్రహాన్ని అమర్చనున్నారు. అనంతరం రెండు రోజుల పాటు రాకెట్‌కు అన్ని రకాల సాంకేతిక పరీక్షలు నిర్వహించి 23న మొదటి అసెంబ్లింగ్‌ బిల్డింగ్‌ (వ్యాబ్‌) నుంచి ప్రయోగవేదిక (ఉంబ్లికల్‌ టవర్‌)కు అనుసంధానించే పనులు చేపట్టనున్నారు. అక్కడ సుమారు ఆరు రోజుల పాటు అన్ని రకాల పరీక్షలు నిర్వహించిన అనంతరం 29న సాయంత్రం 3 నుంచి 4 గంటల మధ్యలో ప్రయోగించేందుకు సన్నాహాలు చేస్తున్నారు.

ЦитироватьПуск GSLV F08 - 29 марта
14 марта 2018, 02:22 IST

Шрихарикота: Ученые планируют запустить ракету GSLV F08 со второго пусковой площадки Космического центра Сатиша Дхавана (SHAR) 29-го числа этого месяца. 11-го числа этого месяца была завершена последняя стадия сборки ракеты - установлена третья ступень РН.

После завершения тестовых проверок РН 19 марта на ракету будет установлена полезная нагрузка - спутник GSAT-6A массой 2140 кг. После проведения различных проверок примерно в течении двух дней 23 марта планируется вывоз РН из здания сборки (VAB) на СК. На СК будут далее проведены шесть раундов тестирования РН в течении примерно шести дней, а затем ещё от трёх до четырёх проверок вечером 29-го марта.

ЦитироватьVOMF

A0595/18 (Issued for VOMF PART 1 OF 2) - GSLV-F08 ROCKET LAUNCH FM SHAR RANGE,SRIHARIKOTA WILL
TAKE PLACE AS PER FLW DETAILS. THE LAUNCH WILL BE ON
ANY ONE OF THE DAY DRG THIS PERIOD.  ACTUAL DATE OF
LAUNCH WILL BE INTIMATED 24HRS IN ADVANCE THROUGH A
SEPERATE NOTAM.
LAUNCH PAD COORD: 1343.2N 08013.8E
NO FLT IS PERMITTED OVER THE DNG ZONE.
A.DNG ZONE-1 IS A CIRCLE OF 10NM AROUND THE LAUNCHER
B.DNG ZONE-2 IS A RECTANGULAR AREA BOUNDED BY
1150N08515E 1235N08525E 1215N08625E 1130N 08615E 
C.DNG ZONE-3 IS A RECTANGULAR AREA BOUNDED BY
1040N 08905E 1120N 08915E  1045N 09045E   1005N 09035E
D.DNG ZONE-4 IS A RECTANGULAR AREA BOUNDED BY
0750N09515E 0930N09515E 0930N09605E 0750N09605E
RTE AFFECTED IN CHENNAI FIR ARE:
N571, P761, N877, W20, A465, P762, L510, P628,
L645, Q10, Q11, Q23, Q24, V3, V4, V9 AND V11  
CLOSURE/ALTN RTE:
1) N571 NOT AVBL BTN DORAM AND BIKEN
ALTN RTE: DORAM-DCT-MMV VOR-DCT AVGIR (123327N 0820041E)
-DCT BIKEN - N571  (BIDIRECTIONAL)
2) P761 NOT AVBL MMV VOR AND PPB VOR
ALTN RTE: MMV VOR - DCT -AVGIR (123327N 0820041E)- DCT BIKEN
-DCT- PTB 0940N09040E- DCT-PPB VOR (BIDIRECTIONAL)
END PART 1 OF 2. 1100-1500, 29 MAR 11:00 2018 UNTIL 27 APR 15:00 2018. CREATED:
20 MAR 12:15 2018

A0595/18 (Issued for VOMF PART 2 OF 2) - 3) N877 NOT AVBL BTN LAGOG AND ORARA
ALTN RTE: LAGOG-DCT-BASOP-DCT-ORARA (BIDIRECTIONAL)
4) W20 NOT AVBL BTN MMV VOR AND BODEL
ALTN RTE: MMV VOR-TR319/139DEG- 53NM-TTP VOR TR357/177DEG
- 81NM-BODEL (BIDIRECTIONAL)
5) A465 NOT AVBL BTN MMV VOR AND DOKET
ALTN RTE: MMV VOR-TR319/139DEG- DIST 53NM- TTP VOR -
TR034/214DEG-DIST 53NM-POINT A (142225N 0800303E) -
TR055/235DEG-126NM- DOKET-A465 (BIDIRECTIONAL)
6) P762 NOT AVBL PPB VOR AND XOKRO
ALTN RTE: PPB VOR- DCT-PT B 0940N 09040E-DCT-XOKRO-
P762 (BIDIRECTIONAL)
7) ATS RTE Q23 BTN ISPUL AND MMV VOR NOT AVBL
ALTN RTE: ISPUL-DCT-TTP VOR-DCT-MMV VOR
8 ) ATS RTE Q24 BTN MMV VOR AND BODEL NOT AVBL
ALTN RTE: MMV - DCT - VOR-TTP VOR-DCT-BODEL
9)ATS RTE L510 NOT AVBL BTN BIDEX AND EMRAN (DUE DNG ZONE -4)
10)ATS RTE P628 NOT AVBL BTN IGREX AND VATLA (DUE DNG ZONE -4)
11)ATS RTE L645 NOT AVBL BTN SULTO AND SAMAK (DUE DNG ZONE -4)
12)ATS RTE Q10, Q11, V3, V4, V9, V11 NOT AVBL.
13)CTC NR OF WATCH SUPERVISORY OFFICER, CHENNAI
(NODAL COORDINATOR)
00-91-4422560894/00-91-9840987941/00870762092877. GND - UNL) END PART 2 OF 2,
1100-1500, 29 MAR 11:00 2018 UNTIL 27 APR 15:00 2018. CREATED: 20 MAR 12:15 2018

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GSAT-6A Mission

GSAT-6A, similar to GSAT-6 is a high power S-band communication satellite configured around I-2K bus. The mission life of spacecraft planned is about 10 years. The satellite will also provide a platform for developing technologies such as demonstration of 6 m S-Band Unfurlable Antenna, handheld ground terminals and network management techniques that could be useful in satellite based mobile communication applications. GSAT-6A is scheduled to be launched by GSLV-F08.

GSLV -F08 / GSAT-6A Mission is scheduled to be launched on Thursday, March 29, 2018 at 16:56 Hrs (IST) from SDSC SHAR, Shriharikota.

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GSLV-F08/GSAT-6A Mission Gallery

(https://www.isro.gov.in/sites/default/files/styles/gallery_thumb/public/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/1-nozzleendsegmentofgslv-f08corestagebeingplacedonthemobilelaunchpedestal.jpg?itok=LTNBlTby) (https://www.isro.gov.in/sites/default/files/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/1-nozzleendsegmentofgslv-f08corestagebeingplacedonthemobilelaunchpedestal.jpg) (https://www.isro.gov.in/sites/default/files/styles/gallery_thumb/public/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/2-gslv-f08corestageintegrationisinprogress.jpg?itok=zVz2C2Fv) (https://www.isro.gov.in/sites/default/files/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/2-gslv-f08corestageintegrationisinprogress.jpg) (https://www.isro.gov.in/sites/default/files/styles/gallery_thumb/public/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/3-hoistingofcryogenicupperstageduringvehicleintegration.jpg?itok=nTIlefWx) (https://www.isro.gov.in/sites/default/files/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/3-hoistingofcryogenicupperstageduringvehicleintegration.jpg) (https://www.isro.gov.in/sites/default/files/styles/gallery_thumb/public/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/5-hoistingofcryogenicupperstageduringvehicleintegration.jpg?itok=uLbyTRJK) (https://www.isro.gov.in/sites/default/files/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/5-hoistingofcryogenicupperstageduringvehicleintegration.jpg) (https://www.isro.gov.in/sites/default/files/styles/gallery_thumb/public/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/6-cusintegrationunderprogress.jpg?itok=RTvHr1a6) (https://www.isro.gov.in/sites/default/files/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/6-cusintegrationunderprogress.jpg) (https://www.isro.gov.in/sites/default/files/styles/gallery_thumb/public/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/7-gsat-6aseenwithtwohalvesofpayloadfaringofgslv-f08.jpg?itok=sNZQP8mH) (https://www.isro.gov.in/sites/default/files/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/7-gsat-6aseenwithtwohalvesofpayloadfaringofgslv-f08.jpg) (https://www.isro.gov.in/sites/default/files/styles/gallery_thumb/public/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/8-gslv-f08heat-shieldisbeingclosedwithgsat-6asatellitesinside.jpg?itok=DjL2eJ5O) (https://www.isro.gov.in/sites/default/files/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/8-gslv-f08heat-shieldisbeingclosedwithgsat-6asatellitesinside.jpg) (https://www.isro.gov.in/sites/default/files/styles/gallery_thumb/public/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/9-payloadfairingwithgsat-6aisbeingintegrated.jpg?itok=eL073rBB) (https://www.isro.gov.in/sites/default/files/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/9-payloadfairingwithgsat-6aisbeingintegrated.jpg) (https://www.isro.gov.in/sites/default/files/styles/gallery_thumb/public/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/10-payloadfairingwithgsat-6aisbeingintegrated.jpg?itok=UDzV4ebu) (https://www.isro.gov.in/sites/default/files/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/10-payloadfairingwithgsat-6aisbeingintegrated.jpg) (https://www.isro.gov.in/sites/default/files/styles/gallery_thumb/public/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/11-gsat-6adisassembledmode.jpg?itok=aAGarhoP) (https://www.isro.gov.in/sites/default/files/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/11-gsat-6adisassembledmode.jpg) (https://www.isro.gov.in/sites/default/files/styles/gallery_thumb/public/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/12pho3298.jpg?itok=wpoFgAA_) (https://www.isro.gov.in/sites/default/files/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/12pho3298.jpg) (https://www.isro.gov.in/sites/default/files/styles/gallery_thumb/public/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/13pho4245.jpg?itok=8nHqA8J7) (https://www.isro.gov.in/sites/default/files/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/13pho4245.jpg) (https://www.isro.gov.in/sites/default/files/styles/gallery_thumb/public/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/14pho4895.jpg?itok=e0OvpuVL) (https://www.isro.gov.in/sites/default/files/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/14pho4895.jpg) (https://www.isro.gov.in/sites/default/files/styles/gallery_thumb/public/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/15-gsat-6asatellite.jpg?itok=sABLeFqw) (https://www.isro.gov.in/sites/default/files/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/15-gsat-6asatellite.jpg) (https://www.isro.gov.in/sites/default/files/styles/gallery_thumb/public/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/16-gsat-6asatelliteisbeingcontaineredfortransportationtosharfromisac.jpg?itok=-QDXdKRF) (https://www.isro.gov.in/sites/default/files/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/16-gsat-6asatelliteisbeingcontaineredfortransportationtosharfromisac.jpg)

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ЦитироватьMar 27, 2018

Mission Readiness Review (MRR) committee and Launch Authorization Board (LAB) have cleared the 27 hr countdown activities starting at 13:56hr IST on Wednesday, March 28, 2018 and the launch of GSLV-F08/GSAT-6A for Thursday, March 29, 2018 at 16:56hr IST

ЦитироватьMar 28, 2018

The 27 Hrs Countdown activities for the launch of GSLV-F08 / GSAT-6A Mission have started at 13:56 Hrs IST on Wednesday, March 28, 2018.

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GSLV-F08/GSAT-6A Mission Curtain Raiser Video - English

https://www.isro.gov.in/sites/default/files/videos/gslv-f08-english.mp4.mp4 (https://www.isro.gov.in/sites/default/files/videos/gslv-f08-english.mp4.mp4)
(video (https://www.isro.gov.in/sites/default/files/videos/gslv-f08-english.mp4.mp4))

Description: GSLV-F08/GSAT-6A Mission Curtain Raiser Video - English
Format : MP4
File Size : 69.81 MB
Duration : 00:08:20
Plugin : NA

ЦитироватьMar 28, 2018

Preparations for GSLV-F08 Second stage (GS2) propellant filling operation are under progress

ЦитироватьMar 28, 2018

Second Stage (GS2) N2O4 filling under progress

ЦитироватьMar 28, 2018

Second Stage (GS2) N2O4 filling completed by 16:15 hr IST

ЦитироватьMar 28, 2018

Preparation for Second Stage (GS2) UH25 filling is under progress

ЦитироватьMar 28, 2018

Second Stage (GS2) UH25 filling is under progress.

Цитировать(https://img.novosti-kosmonavtiki.ru/69464.jpg)ISRO‏Подлинная учетная запись @isro (https://twitter.com/isro) 12 ч. назад (https://twitter.com/isro/status/978833130416041984)

GSLV-F08/GSAT-6A Mission https://www.isro.gov.in/launcher/gslv-f08-gsat-6a-mission ... (https://t.co/YWvgUeyETw)
(https://img.novosti-kosmonavtiki.ru/174901.jpg)

ЦитироватьMar 28, 2018

Second Stage (GS2) UH25 filling is completed by 19:45 hr IST

ЦитироватьMar 28, 2018

Propellant filling operation of L40 Stages is under progress. Countdown is progressing normally.

ЦитироватьMar 29, 2018

Propellant filling operation of L40 Stages is completed by 02:20 hr IST.

ЦитироватьMar 29, 2018

Real Time System simulation checks Completed. Countdown is progressing normally.

ЦитироватьMar 29, 2018

Preparations for propellant filling of cryo stage are under progress

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Launch of GSLV-F08 / GSAT-6A Mission - Watch live from 16:30 hrs (IST)

(https://img.novosti-kosmonavtiki.ru/206472.png)

Цитировать(https://img.novosti-kosmonavtiki.ru/186040.jpg)Chris B - NSF‏ @NASASpaceflight (https://twitter.com/NASASpaceflight) 5 ч. назад (https://twitter.com/NASASpaceflight/status/979189891467763712)

ARTICLE: Indian GSLV set for GSAT-6A launch -

https://www.nasaspaceflight.com/2018/03/indian-gslv-set-for-gsat-6a-launch/ ... (https://t.co/RebC5R6Qv8)

- By William Graham
(https://img.novosti-kosmonavtiki.ru/174686.jpg)

Спойлер

(https://img.novosti-kosmonavtiki.ru/174687.jpg)
(https://img.novosti-kosmonavtiki.ru/174688.jpg)(https://img.novosti-kosmonavtiki.ru/174689.jpg)

[свернуть]

ЦитироватьLive coverage: Indian GSLV set for launch with communications satellite
March 29, 2018 (https://spaceflightnow.com/2018/03/) | Stephen Clark (https://spaceflightnow.com/author/stephen-clark/)

Upd ated: 03/29/2018 07:41 Stephen Clark

An Indian Geosynchronous Satellite Launch Vehicle debuting an upgraded higher-thrust second stage engine is set for liftoff Thursday with an S-band communications satellite.

The GSLV Mk.2 launcher is scheduled for takeoff at 1126 GMT (7:26 a.m. EDT; 4:56 p.m. Indian time) Thursday, flying off the Second Launch Pad at the Satish Dhawan Space Center on India's east coast.

Спойлер

Standing 161 feet (49 meters) tall, the GSLV Mk.2 aims to place the Indian-built GSAT 6A communications satellite into an elliptical transfer orbit, a drop-off point on the way to the spacecraft's final orbital perch in geostationary orbit nearly 22,300 miles (35,800 kilometers) over the equator.

Crews at the Indian spaceport on Sriharikota Island transferred the GSLV Mk.2 rocket to its launch pad earlier this month after its build-up inside a vertical hangar. The roughly kilometer-long rollout fr om the Vehicle Assembly Building to the space base's so-called Second Launch Pad occurred along rail tracks, and three swiveling access arms swung into position around the rocket after it arrived at the launch complex.

A launch authorization board convened Tuesday and gave approval to begin the GSLV Mk.2's 27-hour countdown Wednesday.

The mixture of hydrazine and nitrogen tetroxide propellants to be consumed by the rocket's second stage Vikas engine was loaded into the GSLV Mk.2 on Wednesday. The same propellant combination will be pumped into the rocket's four liquid-fueled boosters Thursday, followed by filling of the GSLV Mk.2's third stage with super-cold liquid hydrogen and liquid oxygen.

The launcher's first stage burns pre-packed solid propellants.

Thursday's launch will be the 12th flight of India's GSLV Mk.1 and Mk.2 rocket family since 2001, and the sixth to use an Indian-built cryogenic third stage engine. Six previous missions flown in the GSLV Mk.1 configuration launched with a Russian-manufactured upper stage engine before Indian engineers completed development of a domestic cryogenic engine.

The GSLV Mk.2 has logged four successful missions in a row after the four previous GSLV flights -- including both Mk.1 and Mk.2 versions -- suffered total or partial failures.

The rocket awaiting liftoff Thursday features two upgrades se t to fly for the first time.

The second stage's Vikas engine will generate 190,000 pounds of thrust during it's 2-minute, 12-second firing on Thursday's mission, codenamed GSLV-F08. That's a 6 percent increase in thrust over Vikas engines flown on earlier GSLV missions.

Indian engineers intend to verify the High Thrust Vikas Engine's performance Thursday before introducing the upgrade to the four Vikas engines that power the GSLV Mk.2's strap-on boosters.

The second stage will also employ electromechanical actuators for the first time, replacing hydraulic systems used on past missions. The technology change will make the rocket more reliable, Indian officials said.

The GSLV Mk.2's core stage and boosters will produce nearly 1.8 million pounds of thrust at peak power, steering the rocket downrange from Sriharikota to the east-southeast over the Bay of Bengal.

The rocket's boosters and center stage will fire for around two-and-a-half minutes, propelling the vehicle to an altitude of around 235,000 feet, or 72 kilometers. The second stage's Vikas engine will ignite and the GSLV Mk.2's lower section -- comprising the core stage and boosters -- will jettison in one piece.

The rocket's metallic 11.1-foot (3.4-meter) nose cone will fall away in a clamshell-like fashion at T+plus 3 minutes, 45 seconds, during the second stage burn.

Ignition of the third stage's hydrogen-fueled engine is planned at T+plus 4 minutes, 46 minutes, for a firing scheduled to last nearly 13 minutes.

In another first, the upper stage will be programmed to fire a few seconds longer than on past missions to deplete the engine's liquid oxygen supply, giving the GSAT 6A satellite an extra bit of energy toward its high-altitude orbit.

Separation of the GSAT 6A satellite from the GSLV launcher is expected at T+plus 17 minutes, 46 seconds. Officials expect the spacecraft to reach an egg-shaped orbit ranging in altitude between 105 miles (170 kilometers) and 22,353 miles (35,975 kilometers), with a track tilted 20.6 degrees to the equator.

GSAT 6A's on-board engine will circularize its orbit over the equator, parking at an altitude wh ere the satellite's velocity will match the rate of Earth's rotation.

Geostationary orbits are typically used by communications satellites, and GSAT 6A will operate from a position at 83 degrees east longitude, giving the craft's S-band beams coverage over India.

GSAT 6A will unfurl a 20-foot (6-meter) S-band antenna after launch. The new satellite's design is similar to the GSAT 6 telecom craft successfully launched by a GSLV Mk.2 rocket in 2015.

ISRO says the two satellites are designed for mobile communications services.

[свернуть]

ЦитироватьMar 29, 2018

Propellant filling operations of cryo stage are under progress

ЦитироватьIndian GSLV to Introduce First Incremental Engine Upgrade on GSAT-6A Launch
March 28, 2018 (http://spaceflight101.com/gslv-gsat-6a/upgraded-gslv-to-lift-gsat-6a/)

(https://img.novosti-kosmonavtiki.ru/152831.jpg) (http://spaceflight101.com/gslv-gsat-6a/wp-content/uploads/sites/218/2018/03/23-panoramicviewofgslv-f08onthemobilelaunchpedestalwiththevehicleassemblybuildinginthebackground.jpg)
GSLV Rolls out for March 29 Liftoff – Photo: ISRO

India is gearing up for the country's second space launch of the year, targeting Thursday to send a Geosynchronous Satellite Launch Vehicle toward a high-energy orbital destination with the GSAT-6A government- and military-use communications satellite. Sporting an upgraded engine on its second stage, GSLV Mk.II is set for launch at 11:26 UTC and will be in action for just under 18 minutes to send the ~2,140-Kilogram satellite into a standard Geostationary Transfer Orbit.

Спойлер

Thursday's launch will mark the 12th launch of India's GSLV Mk.I/II launch vehicle family, the sixth of the Mk.II variant with a home-grown Cryogenic Upper Stage and the fifth since the rocket's comeback mission in 2014 after a major design overhaul. All four GSLV missions since the 2014 return to flight have been successful and the Indian Space Research Organization hopes to keep up this reliability record on Thursday before GSLV will be tasked with the high-profile Chandrayaan-2 lunar exploration mission in October, involving a lunar orbiter, lander and a small rover.

(https://img.novosti-kosmonavtiki.ru/152827.jpg) (http://spaceflight101.com/gslv-gsat-6a/wp-content/uploads/sites/218/2018/03/12-gsat-6aseenwithtwohalvesofpayloadfaringofgslv-f08-1.jpg)
GSAT-6A prepares for launch on GSLV F08 – Photo: ISRO

India began design efforts in the 1990s to create a launch vehicle capable of launching Geosynchronous satellites while re-using a large number of proven components fr om the country's Polar Satellite Launch Vehicle which lacked the performance of lifting a meaningful payload mass into a Geotransfer orbit. The result, GSLV Mk. I, comprised the large solid-fueled core stage of PSLV, four liquid-fueled boosters relying on the proven Vikas engine, a hypergolic second stage also powered by Vikas and a cryogenic third stage procured fr om Russia.

This version of GSLV flew five times between 2001 and 2007 – to mediocre success as only two of the missions reached their target orbit.

GSLV Mk.II with an Indian Cryogenic Upper Stage debuted in 2010 but failed to reach orbit due to a failure of the Fuel Boost Pump on India's indigenous cryogenic engine. Another GSLV failure in 2010 sent the rocket back to the drawing board for a top-to-bottom review to identify design deficiencies and create a vehicle capable of satisfying the reliability demands of assured access to Geostationary Orbit from Indian soil.

(https://img.novosti-kosmonavtiki.ru/152828.jpg) (http://spaceflight101.com/gslv-gsat-6a/wp-content/uploads/sites/218/2018/03/17-fullyintegratedgslv-f08insidethevehicleassemblybuilding.jpg)
Photo: ISRO

Since its return in 2014 – implementing dozens of changes and reinforcements across the vehicle – GSLV has been flying successfully, lifting payloads between 2.0 and 2.2 metric tons into GTO. With reliability concerns finally alleviated, ISRO has shifted focus on extracting the most possible performance from the GSLV design through an incremental upgrade process that begins with Thursday's upcoming mission and will continue into 2019 to eventually improve the rocket's GTO payload capacity from 2.2 to up to 3.2 metric tons.

Thursday's GSLV launch introduces an upgraded version of the Vikas 4 engine serving on the rocket's second stage, known as the High Thrust Vikas Engine, HTVE.

Vikas goes back to a cooperation between the French Space Agency CNES and ISRO under which ISRO provided manpower for the development of the Viking 4 engine for the Ariane 2-4 launch vehicle fleet in exchange for licensing rights of the engine design for its own launch vehicle fleet.

>> GSLV Launch Vehicle Overview (http://spaceflight101.com/spacerockets/gslv-mk-ii/)

(https://img.novosti-kosmonavtiki.ru/152837.jpg) (http://spaceflight101.com/gslv-gsat-6a/wp-content/uploads/sites/218/2018/03/GS2-HTVE.jpg)
GSLV GS2 Stage with upgraded HTVE Engine – Photo: ISRO

ISRO adapted the original Viking design for domestic production in India, qualified the engine for longer burn times than on the Ariane rocket and went through a gradual upgrade process to arrive at the Vikas 2 and 4 engines flying on PSLV, GSLV and LVM3 today. In 2016, the Liquid Propulsion Systems Center announced it had successfully performed a 20-second hot-fire test of an upgraded Vikas that would eventually become the HTVE – offering a thrust increase of six percent.

According to ISRO, the vacuum version of the HTVE flying on the GS2 stage on Thursday will generate a thrust of 846.8 Kilonewtons, up from 799kN for the Vikas 4B through raising its chamber pressure from 58 to 62 bar. Consequently, the engine will burn propellant at a rate of 298 Kilograms per second and reduce the burn time of the second stage by seven seconds.

Future performance upgrades planned on the GSLV rocket include the replacement of the Vikas 2 engines on the four L40 boosters with sea-level versions of the HTVE (planned for Chandrayaan-2) and the Cryogenic Upper Stage, currently flying in its CUS-12 variant with 12,800kg propellant capacity, will be upgraded to CUS-15 in 2018 or 2019. Additional performance will be gained through dry mass reduction in various areas of the launch vehicle.

The payload of Thursday's GSLV F08 mission is GSAT-6A, an advanced S-Band communications satellite built by ISRO to provide capacity for mobile communications for use by the government and India's armed forces. Joining the similar GSAT-6 launched in 2015, the satellite will provide capacity expansion and continuity of mobile communication services into the mid-2020s.

(https://img.novosti-kosmonavtiki.ru/152834.jpg) (http://spaceflight101.com/gslv-gsat-6a/wp-content/uploads/sites/218/2018/03/5gsat-6asatelliteundergoingtestatisiteisac.jpg)
GSAT-6A – Photo: ISRO

Based on the I-2K satellite platform, GSAT-6A reportedly weighs in at 2,140 Kilograms and targets an orbital position of 83 degrees East, co-located with its sister craft. The satellite is aiming for an injection orbit of 170 by 35,975 Kilometers at an inclination of 20.63 degrees from wh ere it will conduct three large orbit raising maneuvers with a combined change in velocity of 1,656 meters per second to reach a spot in the Geostationary Belt.

The satellite's communications package consists of five 9 MHz C x S-Band transponders generating five S-Band downlink beams carrying communications from ground stations to mobile communications terminals while five 2.7 MHz S x C-Band transponders receive the uplink from mobile terminals and route it to a ground station hub. GSAT-6A hosts a six-meter Unfurlable S-Band antenna reflector, the largest such deployable launched by India to date; C-Band hub communications are handled through a conventional 0.8-meter antenna.

>> GSAT-6A Satellite Overview (http://spaceflight101.com/gslv-gsat-6a/gsat-6a/)

(https://img.novosti-kosmonavtiki.ru/152830.jpg) (http://spaceflight101.com/gslv-gsat-6a/wp-content/uploads/sites/218/2018/03/22-fullviewofgslv-f08onmobilelaunchpedestalproceedingtowardstheumbilicaltower1.jpg)
Photo: ISRO

The 49-meter tall GSLV rocket was rolled from its assembly building to the Second Launch Pad at the Satish Dhawan Space Center last week to enter final launch preparations. A final Launch Readiness Review on Tuesday cleared the rocket to press into a 27-hour countdown operation Wednesday afternoon, starting with tanking activities on the rocket's four boosters and the GS2 second stage that employ storable propellants while the Cryogenic Upper Stage will receive its dose of Liquid Hydrogen and Liquid Oxygen later in the countdown.

GSLV will come to life five seconds prior to liftoff when its four boosters are commanded to ignite followed by the ignition of the S139 Core Stage to lift the 415-metric-ton rocket off the ground with a total thrust of 800 metric-ton-force.

Heading east across the Indian Ocean, GSLV's core stage will consume 138 metric tons of packed solid propellant over the course of a minute and 47 seconds. One of the peculiarities of GSLV is that its core stage burns shorter than the four L40 boosters clustered around it, coming with the drawback of having to drag the dead weight of the core along for another 45 seconds but eliminating the need for four separation events as the L40/GS1 assembly separates as a whole once the boosters shut down.

Each burning 42,700 Kilograms of UH25/NTO propellants with their Vikas engine, the four boosters will accelerate the vehicle to a speed of 2.4 Kilometers per second. Separation of GS1 occurs 73 Kilometers in altitude at T+2 minutes and 31 seconds with the GS2 stage firing up its HTVE moments before separation systems are initiated. Tasked with a 132.38-second burn, the 11.6-meter long second stage will accelerate the stack by another 2.5 Kilometers per second before the Cryogenic Upper Stage takes over.

>> Flight Profile (http://spaceflight101.com/gslv-gsat-6a/flight-profile/)

(https://img.novosti-kosmonavtiki.ru/152844.jpg) (http://spaceflight101.com/gslv-gsat-6a/wp-content/uploads/sites/218/2018/03/GSLV-F08-Track.jpg)
Mission Ground Track – Image: ISRO

GSLV will drop its 3.4-meter diameter payload fairing three minutes and 45 seconds into the flight when passing through 115 Kilometers in altitude wh ere aerodynamic forces can no-longer harm the satellite. Separation of the GS2 stage occurs at T+4 minutes and 45 seconds and will be followed one second later by the ignition of the CE-7.5 cryo engine on a long burn of 12 minutes and 45 seconds – tasked with increasing the rocket's speed by almost five Kilometers per second to an injection velocity of 9.7 km/s.

India's cryogenic stage begins its burn in high-thrust mode providing 9,500kgf of thrust before reducing thrust to 7,500kgf for the remainder of the burn. GSAT-6A is expected to separate from the 12.8-meter long CUS at T+17 minutes and 46.5 seconds, sailing off on a mission of at least ten years delivering strategic communications.

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ЦитироватьMar 29, 2018

Propellant filling operations of cryo stage are completed

Цитировать(https://img.novosti-kosmonavtiki.ru/185376.jpg)Spaceflight101 LIVE‏ @S101_Live (https://twitter.com/S101_Live) 14 сек. назад (https://twitter.com/S101_Live/status/979313739622207494)

L-20 Minutes: Final flight control reconfigurations wrap up at this point in the countdown and GSAT-6A should be in the process of readying for liftoff by switching to internal power. Tracking Stations have reported launch readiness. http://bit.ly/2GaUIiY  (https://t.co/pBD9xKuFzb) #GSLV (https://twitter.com/hashtag/GSLV?src=hash)

Цитировать(https://img.novosti-kosmonavtiki.ru/185376.jpg)Spaceflight101 LIVE‏ @S101_Live (https://twitter.com/S101_Live) 1 мин. назад (https://twitter.com/S101_Live/status/979315381507588097)

#GSLV (https://twitter.com/hashtag/GSLV?src=hash) Flight Profile: http://bit.ly/2DVYEhC  (https://t.co/0CDhmf1xTi) S139 fires for under two minutes & will separate along with the boosters at T+2:31, followed by a 2 min & 15 sec burn of GS2. The Cryo Stage fires up at T+4:46 and burns for 12 min & 45 sec to push the satellite into a standard GTO.(https://img.novosti-kosmonavtiki.ru/174691.jpg)
(https://img.novosti-kosmonavtiki.ru/174692.jpg)

Цитировать(https://img.novosti-kosmonavtiki.ru/185376.jpg)Spaceflight101 LIVE‏ @S101_Live (https://twitter.com/S101_Live) 57 сек. назад (https://twitter.com/S101_Live/status/979315834987470849)

#GSLV (https://twitter.com/hashtag/GSLV?src=hash) is now entering its choreographed countdown sequence to switch to battery power, enable igniters, pressurize its tanks and transition its flight controls to launch mode.

Цитировать(https://img.novosti-kosmonavtiki.ru/185376.jpg)Spaceflight101 LIVE‏ @S101_Live (https://twitter.com/S101_Live) 20 сек. назад (https://twitter.com/S101_Live/status/979320764074782720)

Ten minutes are left on the Cryogenic Upper Stage. Flight trajectory so far appears right on the money. #GSLV (https://twitter.com/hashtag/GSLV?src=hash)
(https://img.novosti-kosmonavtiki.ru/174694.jpg)

Цитировать(https://img.novosti-kosmonavtiki.ru/185376.jpg)Spaceflight101 LIVE‏ @S101_Live (https://twitter.com/S101_Live) 2 мин. назад (https://twitter.com/S101_Live/status/979321326304399361)

T+10 Minutes: #GSLV (https://twitter.com/hashtag/GSLV?src=hash) is targeting an orbit of 170 by 35,975 Kilometers at an inclination of 20.63 degrees. This orbit will enable GSAT-6A to reach a stationary position in GEO with delta-v of 1,656 m/s.

Цитировать(https://img.novosti-kosmonavtiki.ru/185376.jpg)Spaceflight101 LIVE‏ @S101_Live (https://twitter.com/S101_Live) 2 мин.назад (https://twitter.com/S101_Live/status/979321918846316544)

Five minutes to go in this first and only burn of the Cryogenic Upper Stage. Trajectory is tracking down the nominal. #GSLV (https://twitter.com/hashtag/GSLV?src=hash)

Цитировать(https://img.novosti-kosmonavtiki.ru/185376.jpg)Spaceflight101 LIVE‏ @S101_Live (https://twitter.com/S101_Live) 4 мин. назад (https://twitter.com/S101_Live/status/979323341717803009)

SPACECRAFT SEPARATION - India's GSAT-6A sails off on its mission after receiving a smooth ride atop its #GSLV (https://twitter.com/hashtag/GSLV?src=hash) Mk. II rocket. The 2,140kg satellite will deliver S-Band coverage for mobile communications. Satellite Overview: http://bit.ly/2G9TIrC  (https://t.co/NOVJTbUu98)
(https://img.novosti-kosmonavtiki.ru/174706.jpg)

Цитировать(https://img.novosti-kosmonavtiki.ru/67530.jpg)Spaceflight Now‏ @SpaceflightNow (https://twitter.com/SpaceflightNow) 4 мин. назад (https://twitter.com/SpaceflightNow/status/979323804890599424)

India's launch team has confirmed the GSLV Mk.2 achieved an on-target orbit on today's mission, and the GSAT 6A communications satellite has been successfully deployed. https://spaceflightnow.com/2018/03/29/gslv-f08-mission-status-center/ ... (https://t.co/1fEnQcnzMg)
(https://img.novosti-kosmonavtiki.ru/174704.jpg)

Цитировать(https://img.novosti-kosmonavtiki.ru/186040.jpg)Chris B - NSF‏ @NASASpaceflight (https://twitter.com/NASASpaceflight) 33 мин. назад (https://twitter.com/NASASpaceflight/status/979323942925201408)

S/C Sep for GSAT-6A!

Article - by William Graham:

https://www.nasaspaceflight.com/2018/03/indian-gslv-set-for-gsat-6a-launch/ ... (https://t.co/RebC5R6Qv8)

(https://img.novosti-kosmonavtiki.ru/174705.jpg)(https://img.novosti-kosmonavtiki.ru/174702.jpg)

ЦитироватьThe Launch of ISRO's - GSLV-F08 / GSAT-6A Satellite from SHAR, Sriharikota

DoordarshanNational (https://www.youtube.com/channel/UCSjPe5kinQtwcyHcFJyyMfw)

Трансляция началась 1 час назад

The Launch of ISRO's GSLV-F08 / GSAT-6A Satellite from Satish Dhawan Space Centre (SHAR), Sriharikota

ЦитироватьMar 29, 2018

GSLV-F08 Successfully launches GSAT-6A

ЦитироватьGSLV-F08 launches GSAT-6A

SciNews (https://www.youtube.com/channel/UCjU6ZwoTQtKWfz1urL7XcbA)

Опубликовано: 29 мар. 2018 г.

ЦитироватьGSLV Rocket Soars to 5th Success in a Row with Upgraded Vikas Engine & new Shutdown Technique
 March 29, 2018 (http://spaceflight101.com/gslv-gsat-6a/gslv-f08-launch-success/)

(https://img.novosti-kosmonavtiki.ru/152840.jpg) (http://spaceflight101.com/gslv-gsat-6a/wp-content/uploads/sites/218/2018/03/gslvf08-4.jpg)
Photo: DD News / ISRO

India's Geosynchronous Satellite Launch Vehicle powered away from the country's Eastern Shore on Thursday, successfully placing the GSAT-6A advanced S-Band communications satellite into orbit and introducing an upgraded engine as the first of a number of improvements coming up on India's rockets in the coming years.

Riding on pillars of fire and smoke, GSLV Mk.II lifted off from the Satish Dhawan Space Center at 11:26 UTC under the power of its solid-fueled core stage and four boosters guzzling down a toxic propellant mixture of Hydrazine and Nitrogen Tetroxide. The combined boosters/first stage assembly dropped away after two and a half minutes and the new High Thrust Vikas Engine on the second stage fired for the next 132 seconds before India's indigenous Cryogenic Upper Stage took over for a long burn of nearly 13 minutes to accelerate the stack to an injection speed of 9.7 Kilometers per second and try out a new shutdown technique.

Спойлер

(https://img.novosti-kosmonavtiki.ru/152833.jpg) (http://spaceflight101.com/gslv-gsat-6a/wp-content/uploads/sites/218/2018/03/3-integrationofgsat-6asatelliteinprogress9.jpg)
GSAT-6A Satellite – Photo: ISRO

GSAT-6A sailed off on its mission 17 minutes and 45 seconds after liftoff and Indian Space Research Organization officials declared the launch a success after reviewing the orbital parameters achieved by the GSLV rocket. Thursday's launch was India's 12th GSLV mission, the sixth of the Mk.II variant with Indian upper stage and it improved GSLV's reliability record to 5-of-5 since returning from a major design overhaul in 2014.

The success of GSLV F08 was also extremely welcome news to India's research community since GSLV is set to launch the Chandrayaan-2 lunar research mission in October of this year that attempts to place an instrumented orbiter into a low orbit around the Moon and land a science platform and small rover on the lunar surface. The $125 million Chandrayaan-2 spacecraft is the first flagship mission launching on the GSLV and was contingent on the launcher proving its reliability via successful launches in 2016-18.

(https://img.novosti-kosmonavtiki.ru/152829.jpg) (http://spaceflight101.com/gslv-gsat-6a/wp-content/uploads/sites/218/2018/03/21-asideviewofgslv-f08onthemobilelaunchpedestalproceedingtowardstheumbilicaltower2.jpg)
Photo: ISRO

GSLV opened up a string of three orbital space launches planned on Thursday with a Chinese Long March 3B set to lift the next pair of Beidou-3 navigation satellites and a Russian Soyuz 2-1v lofting a classified satellite going by the name EMKA later in the day for the first trifecta of 2018; the last time three orbital missions went up on a single calendar day was on December 23, 2017.

GSLV Mk.II currently represents the intermediate-lift workhorse of the Indian space program, operating alongside the Polar Satellite Launch Vehicle that is called upon for Low Earth Orbit missions and some of the lighter GTO deliveries like India's navigation satellites while the LVM3 (also known as GSLV Mk.III) handles the heavy-lifting via a GTO capacity in excess of four metric tons.

Gaining an ability of launching sizeable communications satellites toward Geostationary Orbit has been a major objective of the Indian Space Program since the 1990s as the country was dependent on foreign launchers and to this day continues to place its heavier communications craft on Ariane 5 rockets.

GSLV Mk.II was developed over the 1990s with the goal of creating a launcher capable of lifting two-metric-ton-class satellites into Geostationary Transfer Orbit while re-using as many proven components from PSLV as possible.

(https://img.novosti-kosmonavtiki.ru/152838.jpg) (http://spaceflight101.com/gslv-gsat-6a/wp-content/uploads/sites/218/2018/03/gslv-f02failure.jpg)
GSLV F02 Failure – Credit: ISRO

But even that turned out to be anything but trivial as India struggled to master the technology of a full-cryogenic rocket stage which was the major development needed to achieve the desired performance for GTO missions. GSLV reached the launch pad in 2001 – re-using the S139 first stage of PSLV as a solid-fueled core with four Vikas-powered L40 boosters around it, a PSLV-derived second stage atop and a Russian Cryogenic Stage filling the role as interim third stage while India continued development efforts of its home-grown cryogenic stage.

This vehicle, known as GSLV Mk. I, flew five times through 2007 with mixed results – reaching its target orbit on two missions, achieving lower orbits on two flights and encountering one outright failure. GSLV Mk.II – sporting India's first cryo stage – launched in 2010 but failed to achieve orbit when the Fuel Boost Pump of the cryogenic engine malfunctioned within the first second of its operation. Another failure in 2010 set the GSLV back to a record of only two successes in seven missions – sending the vehicle back to the drawing board for a design overhaul.

GSLV Mk.II returned to flight in 2014 with dozens of modifications focused on reinforcing structural interfaces across the 49-meter tall rocket and increasing the reliability of the Cryogenic Upper Stage (CUS) and its hydrogen-fueled engine. Since its return to flight, GSLV kept up a spotless record, lifting the GSAT-14, 6 and 9 communications satellites, the INSAT-3DR weather satellite and adding to its success streak on Thursday with GSAT-6A.

(https://img.novosti-kosmonavtiki.ru/152837.jpg) (http://spaceflight101.com/gslv-gsat-6a/wp-content/uploads/sites/218/2018/03/GS2-HTVE.jpg)
GSLV GS2 Stage with upgraded HTVE Engine – Photo: ISRO

Now a vehicle of proven reliability, GSLV has entered the next phase of its evolution to reach its full potential through a series of incremental design upgrades, aiming to boost its GTO capacity from 2.23 metric tons to up to 3.2 metric tons, according to ISRO officials quoted by Indian news outlets. Improvements will be made in the form of dry mass reduction across the vehicle, upgrading its booster and second stage engines and placing a larger Cryogenic Upper Stage atop the future GSLV-Mk.IIA.

Instead of upgrading to the Mk.IIA in one step, ISRO will implement improved components as available on a flight-by-flight basis starting on Thursday's F08 mission with the introduction of the High Thrust Vikas Engine on the GS2 second stage, offering a 6% increase in vacuum thrust which translates to +70kg for the rocket's GTO performance.

Vikas is an adapted version of the European Viking engine developed in the 1970s under a cooperation between the French Space Agency and the Indian Space Research Organization under which ISRO provided manpower for the engine development effort in exchange for licensing rights of the Viking design for its own vehicle fleet. The original Viking design flying on the Ariane 2-4 series was modified by ISRO by qualifying it for the burn time and operational parameters found on the PSLV and GSLV rockets.

>> GSLV Launch Vehicle Overview (http://spaceflight101.com/spacerockets/gslv-mk-ii/)

(https://img.novosti-kosmonavtiki.ru/152846.jpg) (http://spaceflight101.com/gslv-gsat-6a/wp-content/uploads/sites/218/2018/03/Vikas-HTVE1.jpg)
Image: ISRO

Vikas is a central element of India's current line of rockets: its vacuum-optimized version serves on the second stages of the PSLV and GSLV Mk.II rockets while the Vikas 2 sea level variant powers the four L40 boosters of the Mk. II and a specialized Vikas-X propels L110 Core Stage of the LVM3. The High Thrust Vikas Engine (HTVE) was realized by increasing the mass flow through the engine by around 15 Kilograms per second to yield an increase in chamber pressure from 58 to 62 bar, translating to an increase in thrust from 799 to 846.8 Kilonewtons for the vacuum version of the engine.

Additionally, HTVE implements an electro-mechanical thrust vector control system replacing the hydraulically-driven system of the heritage engine to bolster its reliability through a simpler design. The sea level HTVE will be introduced on the GSLV Mk. II rocket later this year according to the Liquid Propulsion Systems Center, yielding another gain of 250 Kilograms of payload capacity – presumably referring to the rocket's GTO capabilities. PSLV will also receive a performance boost when eventually switching to the HTVE on its PS2 stage.

Another upgrade making its debut on Thursday was the introduction of a minimum propellant residuals shutdown on the Cryogenic Upper Stage – essentially allowing the cryogenic engine to fire until sensors within the propellant tanks detect that propellant has reached a minimal level for a safe shutdown upon which the engine will be cut off.

(https://img.novosti-kosmonavtiki.ru/152832.jpg) (http://spaceflight101.com/gslv-gsat-6a/wp-content/uploads/sites/218/2018/03/28indigenouscryogenicupperstageofgslv-f09atstagepreparationfacility.jpg)
CUS-12 Rocket Stage (F09) – Photo: ISRO

Previously, GSLV relied on a guidance-based shutdown, ending the upper stage burn when attaining the desired injection velocity which typically occurred when there was still propellants left in the tank due to conservative mission simulations.  Allowing the CUS to burn to depletion is expected to yield four to five seconds of additional burn time which translates to a performance gain of up to 75 meters per second.

The Cryogenic Upper Stage will also be the focus of another major GSLV upgrade late down the road. It currently flies in its CUS-12 variant with a propellant load of 12,800 Kilograms and will be replaced by the larger CUS-15 in 2018 or 2019 for another significant increase in vehicle performance.

From a performance point of view, Thursday's F08 mission did not necessarily require an upgraded GSLV launcher – lifting the 2,140-Kilogram GSAT-6A S-Band communications satellite into Geostationary Transfer Orbit. The satellite is joining a sister craft, GSAT-6 launched in 2015, to expand mobile communications capacity for the Indian government and armed forces.

(https://img.novosti-kosmonavtiki.ru/152836.jpg) (https://img.novosti-kosmonavtiki.ru/152836.jpg)
Image: ISRO

Built on ISRO's I-2K platform, GSAT-6A hosts an 0.8-meter C-Band antenna carrying communications between the satellite and ground hub stations in India while communications to & from mobile terminals are handled through S-Band with the help of a six-meter unfurlable antenna reflector – the largest of its kind flown by India to date. Five 2.7 MHz S x C-Band transponders are responsible for the terminal-to-hub link while five 9 MHz C x S-Band transponders carry communications from the hub station to deployed terminals.

GSAT-6A is expected to join its nearly identical sister craft at an orbital position of 83 degrees East in Geostationary Orbit, doubling the available S-Band capacity by adding another five downlink spot beams. The satellite also provides continuity of services into the second half of the 2020s via its planned ten-year operational life.

>> GSAT-6A Satellite Overview (http://spaceflight101.com/gslv-gsat-6a/gsat-6a/)

(https://img.novosti-kosmonavtiki.ru/152839.jpg) (http://spaceflight101.com/gslv-gsat-6a/wp-content/uploads/sites/218/2018/03/gslvf08-3.jpg)
Photo: DD News / ISRO

(https://img.novosti-kosmonavtiki.ru/152841.jpg) (http://spaceflight101.com/gslv-gsat-6a/wp-content/uploads/sites/218/2018/03/gslvf08-5.jpg)
Photo: DD News / ISRO

Thursday's launch was preceded by a 27-hour countdown operation starting Wednesday afternoon with loading the four L40 boosters and GS2 stage with a toxic mix of UH25 Hydrazine fuel and Nitrogen Tetroxide oxidizer – a storable propellant combination that self-ignites once coming into contact. The CUS received its dose of Liquid Hydrogen and Liquid Oxygen later in the countdown and was kept topped up while GSLV went through a final set of reconfigurations before entering its critical terminal countdown at T-12 minutes.

The 415-metric-ton rocket fired up its four boosters at T-4.8 seconds to allow them to reach operational conditions before the solid-fueled core stage ignited to lift the vehicle off the pad at an initial thrust-to-weight ratio near two. Thundering away from Sriharikota with a thrust of 800 metric ton-force, GSLV swung to the south-east – departing along a 106-degree launch azimuth that was modified by half a degree to reach the desired argument of perigee while accounting for the shorter GS2 burn time.

Burning 138 metric tons of packed propellant, GS1 ran out of propellant one minute and 49 seconds after liftoff while the four boosters continued firing their Vikas engines at full throttle – carrying the dead weight of the central core with them for another 42 seconds since the GS1/L40 assembly separates as a whole after booster shutdown. Each consuming 42,800 Kilograms of propellant, the booster helped push GSLV to a speed of 2.4 Kilometers per second with separation from the GS2 stage occurring two minutes and 33 seconds into the mission in hot staging mode.

(https://img.novosti-kosmonavtiki.ru/152842.jpg) (http://spaceflight101.com/gslv-gsat-6a/wp-content/uploads/sites/218/2018/03/gslvf08-6.jpg)
Photo: DD News / ISRO

Lighting up the HTVE-Vacuum engine, GS2 was set for a burn of 132.38 seconds, some seven seconds shorter than its predecessor due to the higher flowrate on the engine. GSLV passed 115 Kilometers in altitude at T+3 minutes and 46 seconds and dropped its 3.4-meter diameter fairing halves since aerodynamic forces were no-longer a danger to the delicate satellite structure.

Burning 39,480 Kilograms of hypergolic propellants, the second stage appeared to deliver good performance – staying right on the pre-flight prediction in terms of speed and altitude. Separation was called out four minutes and 47 seconds into the mission followed two seconds later by ignition of the cryo stage, starting out at a speed of 4.9 Kilometers per second and tasked with boosting the stack to target injection velocity of 9,754 meters per second.

(https://img.novosti-kosmonavtiki.ru/152843.jpg) (http://spaceflight101.com/gslv-gsat-6a/wp-content/uploads/sites/218/2018/03/gslvf08-8.jpg)
Onboard View GSAT-6A Separation – Photo: DD News / ISRO

The GSLV F08 mission was targeting an orbit of 170 by 35,975 Kilometers at an inclination of 20.63 degrees – to be achieved after a long CUS burn of 12 minutes and 45 seconds. Shutdown of the upper stage was confirmed right at the T+17.5-minute mark and the rocket's onboard navigation system indicated it achieved a very accurate orbit. GSLV was lauded once again for its precision by ISRO officials after the successful separation of GSAT-6A was confirmed at the 1,050-second mark into the flight.

Checking off its second orbital launch of the year, ISRO is looking forward to continuing a busy spaceflight year 2018 with ten planned missions. The next launch on the manifest is that of the IRNSS-1I navigation satellite, filling in for IRNSS-1H that was lost in last year's PSLV failure (http://spaceflight101.com/pslv-c39/) to take over for the defective IRNSS-1A satellite within India's Navic constellation. After that will likely be another PSLV followed by a heavy-lift mission of the LVM3 rocket, its second orbital launch.

[свернуть]

Цитировать(https://img.novosti-kosmonavtiki.ru/67516.jpg)Jonathan McDowell‏Подлинная учетная запись @planet4589 (https://twitter.com/planet4589) 3 мин. назад (https://twitter.com/planet4589/status/979358365821407236)

GSAT-6A and the cryogenic upper stage CUS have been cataloged in 149 x 36500 km x 20.7 deg geotransfer orbit after successful ascent.

ЦитироватьMar 29, 2018

GSLV Successfully Launches GSAT-6A Satellite

India's Geosynchronous Satellite Launch Vehicle (GSLV-F08 ) successfully launched GSAT-6A Satellite into Geosynchronous Transfer Orbit (GTO) today (March 29, 2018 ). Today's launch of GSLV was its twelfth and took place from the Second Launch Pad at Satish Dhawan Space Centre (SDSC) SHAR, Sriharikota, the spaceport of India. This is the fifth consecutive success achieved by GSLV carrying indigenously developed Cryogenic Upper Stage.

In its oval shaped GTO, GSAT-6A is now orbiting the Earth with a perigee (nearest point to Earth) of 169.4 km and an apogee (farthest point to Earth) of 36,692.5 km with an orbital inclination of 20.64 deg with respect to the equator.

Few seconds before the launch countdown reached zero, the four liquid propellant strap-on motors of GSLV-F08, each with nearly 43 tons of liquid propellants, were ignited. At count zero and after confirming the normal performance of all the four strap-on motors, the 139 ton solid propellant first stage core motor was ignited and GSLV lifted off at 16:56 IST, as scheduled. The major phases of the flight occurred as intended. About seventeen and a half minutes after lift-off, GSAT-6A was successfully placed in GTO.

Soon after separation from GSLV, the two solar arrays of GSAT-6A were automatically deployed in quick succession and the Master Control Facility (MCF) at Hassan in Karnataka assumed control of the satellite.

GSAT-6A is a communication satellite built by ISRO to provide mobile communication services through multi beam coverage. For this, it is equipped with S and C band transponders.

In the coming days, the orbit of GSAT-6A will be raised from its present GTO to the final circular Geostationary Orbit (GSO) by firing the satellite's Liquid Apogee Motor (LAM) in stages. The Satellite will be commissioned into service after the completion of orbit raising operations and its positioning in the designated slot in GSO following in-orbit testing of its payloads.

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GSLV-F08/GSAT-6A Mission Gallery

(https://img.novosti-kosmonavtiki.ru/206630.jpg) (https://www.isro.gov.in/sites/default/files/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/5logu2661.jpg) (https://img.novosti-kosmonavtiki.ru/206629.jpg) (https://www.isro.gov.in/sites/default/files/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/4avp0597.jpg) (https://img.novosti-kosmonavtiki.ru/206628.jpg) (https://www.isro.gov.in/sites/default/files/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/3f08l0113.jpg) (https://img.novosti-kosmonavtiki.ru/206627.jpg) (https://www.isro.gov.in/sites/default/files/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/2bjs0949.jpg) (https://img.novosti-kosmonavtiki.ru/206622.jpg) (https://www.isro.gov.in/sites/default/files/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/1logu2538.jpg) (https://img.novosti-kosmonavtiki.ru/206632.jpg) (https://www.isro.gov.in/sites/default/files/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/pade02h.jpg) (https://img.novosti-kosmonavtiki.ru/206633.jpg) (https://www.isro.gov.in/sites/default/files/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/pade02.jpg) (https://img.novosti-kosmonavtiki.ru/206631.jpg) (https://www.isro.gov.in/sites/default/files/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/pade01h.jpg) (https://img.novosti-kosmonavtiki.ru/206634.jpg) (https://www.isro.gov.in/sites/default/files/galleries/GSLV-F08/GSAT-6A%20Mission%20Gallery/padeh.jpg) (https://img.novosti-kosmonavtiki.ru/206573.jpg) (https://www.isro.gov.in/sites/default/files/galleries/%E0%A4%9C%E0%A5%80.%E0%A4%8F%E0%A4%B8.%E0%A4%8F%E0%A4%B2.%E0%A4%B5%E0%A5%80.-%E0%A4%8F%E0%A4%AB08/%E0%A4%9C%E0%A5%80%E0%A4%B8%E0%A5%88%E0%A4%9F-6%E0%A4%8F%20%20%E0%A4%AE%E0%A4%BF%E0%A4%B6%E0%A4%A8%20%E0%A4%A6%E0%A5%80%E0%A4%B0%E0%A5%8D%E0%A4%98%E0%A4%BE%20/24gslv-f08attheumbilicaltowerofthesecondlaunchpad.jpg)

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GSLV-F08 Onboard Camera Video

https://www.isro.gov.in/sites/default/files/videos/f08_final.mp4.mp4 (https://www.isro.gov.in/sites/default/files/videos/f08_final.mp4.mp4)
(Video (https://www.isro.gov.in/sites/default/files/videos/f08_final.mp4.mp4))
Description: GSLV-F08 Onboard Camera Video
Format : MP4
File Size : 13.7 MB
Duration : 00:01:41

ЦитироватьMar 30, 2018

The first orbit raising operation of GSAT-6A Satellite has been successfully carried out by LAM Engine firing for 2188 sec from 09:22hr IST on March 30, 2018.

Orbit Determination results from this LAM firing are:

[/li]
• apogee X perigee height was changed to 36412 km X 5054 km.
• Inclination is 11.93 deg.
• Orbital period is 12hr 45min.
  

ЦитироватьIndia tests upgraded engine tech in successful communications satellite launch
March 29, 2018 (https://spaceflightnow.com/2018/03/) | Stephen Clark (https://spaceflightnow.com/author/stephen-clark/)

(https://img.novosti-kosmonavtiki.ru/144080.jpg)
India's GSLV Mk.2 rocket takes off Thursday with the GSAT 6A communications satellite. Credit: ISRO

An Indian satellite built as a technological testbed for mobile communications successfully launched Thursday on top of a Geosynchronous Satellite Launch Vehicle, one of 10 space missions planned by India by the end of the year.

The GSAT 6A spacecraft, carrying a deployable S-band antenna and multiple communications beams, lifted off on top of India's Geosynchronous Satellite Launch Vehicle at 1126 GMT (7:26 a.m. EDT; 4:56 p.m. Indian time).

Спойлер

The 161-foot-tall (49-meter) GSLV Mk.2 rocket took off with nearly 1.8 million pounds of thrust fr om the Satish Dhawan Space Center, a coastal spaceport located on Sriharikota Island around 50 miles (80 kilometers) north of Chennai on the country's east coast.

Four liquid-fueled Vikas engines ignited in the final seconds of the countdown, and a core rocket motor consuming pre-packed solid propellant ignited to boost the GSLV Mk.2 into a clear late afternoon sky.

The rocket's guidance computer commanded the GSLV Mk.2 on a course east-southeast from the Sriharikota space base. The launcher's core stage emptied its solid propellant casing and burned out less than two minutes after liftoff, and the four Vikas booster engines shut down around two-and-a-half minutes into the flight.

A Vikas engine on the GSLV Mk.2's second stage ramped up to full power, generating around 190,000 pounds of thrust during a 2-minute, 12-second firing. That's a 6 percent increase in thrust over Vikas engines flown on earlier GSLV missions.

Indian engineers wanted to demonstrate the High Thrust Vikas Engine's performance Thursday before introducing the upgrade to the four Vikas engines that power the GSLV Mk.2's strap-on boosters on future missions.

The second stage also employed electromechanical actuators powered by lithium-ion batteries for the first time, replacing hydraulic systems used on past missions. The technology change will make the rocket more reliable, Indian officials said.

The rocket's metallic 11.1-foot (3.4-meter) nose cone dropped away in a clamshell-like fashion at T+plus 3 minutes, 45 seconds, during the second stage burn.

Ignition of the third stage's hydrogen-fueled engine occurred at approximately T+plus 4 minutes, 46 minutes, for a firing that lasted nearly 13 minutes.

In another first, the upper stage was programmed to fire a few seconds longer than on past missions to deplete the engine's liquid oxygen supply, giving the GSAT 6A satellite an extra bit of energy toward its high-altitude orbit.

Live video from an on-board camera showed the GSAT 6A satellite separating from the GSLV Mk.2's third stage around 18 minutes after liftoff. A round of applause inside the launch control center heralded the successful mission.

"Today, the fifth successive successful launch of GSLV with an indigenous cryogenic stage successfully placed the high-power S-band communications satellite GSAT 6A in the designated orbit precisely," said K. Sivan, chairman of the Indian Space Research Organization.

A rocket propulsion expert who took over ISRO's top post in January, Sivan said the GSLV Mk.2's performance enhancements are aimed at eventually increasing the rocket's lift capability to near 3 metric tons — about 6,600 pounds. The higher-thrust Vikas engines will be installed on the first stage boosters flown on future GSLV Mk.2 missions.

The GSAT 6A satellite launched Thursday is similar in design to the GSAT 6 telecom craft successfully launched by a GSLV Mk.2 rocket in 2015.

(https://img.novosti-kosmonavtiki.ru/144179.jpg)
Artist's concept of the GSAT 6A satellite in orbit. Credit: ISRO

"GSAT 6A is a complement to GSAT 6, which is already in orbit," Sivan said. "These two satellites combined are going to provide a platform for development of advanced technologies, such as unfurlable antennas, hand-held devices and ground networks for two-way point-to-point satellite communications," Sivan said.

The GSLV Mk.2's third stage released the GSAT 6A satellite into an elliptical transfer orbit stretching from a low altitude of around 92 miles (149 kilometers) to a peak altitude around 22,685 miles (36,508 kilometers), according to U.S. military tracking data. The orbit was tilted at an angle of 20.7 degrees to the equator.

The altitude and inclination parameters were close to pre-flight predictions.

Using three major orbit-raising maneuvers, GSAT 6A's on-board engine will circularize its orbit over the equator over the next week, parking at an altitude wh ere the satellite's velocity will match the rate of Earth's rotation.

Geostationary orbits are typically used by communications satellites, and GSAT 6A will operate from a position at 83 degrees east longitude, giving the craft's five S-band spot beams and single C-band beam coverage over India.

GSAT 6A will unfurl a 20-foot (6-meter) S-band antenna once it arrives in geostationary orbit. The new satellite is the second Indian spacecraft to feature such a large antenna.

The Indian military will be a prime user of GSAT 6A, using the satellite's ability to connect with small terminals on ships and in other mobile vehicles.

V. Ramanathan, ISRO's satellite director for the GSAT 6A satellite, said in remarks after the launch that the new spacecraft deployed its electricity-generating solar panels shortly after separation from the rocket's third stage.

Thursday's launch was the 12th flight of India's GSLV Mk.1 and Mk.2 rocket family since 2001, and the sixth to use an Indian-built cryogenic third stage engine. Six previous missions flown in the GSLV Mk.1 configuration launched with a Russian-manufactured upper stage engine before Indian engineers completed development of a domestic cryogenic engine.

With Thursday's launch, the GSLV Mk.2 has logged five successful missions in a row after the four previous GSLV flights — including both Mk.1 and Mk.2 versions — suffered total or partial failures.

"What is next? Definitely, ISRO has huge plans," Sivan said after Thursday's launch. "This year is going to be another high-profile year for ISRO.

"In the next nine months, we are going to have 10 missions of diverse applications like space science, Earth observation, communications and navigation. All the areas are going to have missions this year."

India's next space mission is set for launch April 12, when a Polar Satellite Launch Vehicle will loft the country's ninth navigation satellite from a different launch pad at Sriharikota. If workers at the spaceport keep the PSLV mission on track, it will mark the shortest time between two Indian space launches.

P. Kunhikrishnan, director of the Indian launch base, said the PSLV has been fully assembled on its launch pad in advance of the mid-April liftoff. The IRNSS 1I navigation satellite set to ride the PSLV into orbit has also arrived at the launch base.

The April 12 launch will be the first for India's navigation satellite program since a failed PSLV flight in August 2017, which left a navigation payload stranded on the rocket.

Preparations for the next launch of the GSLV Mk.3, India's most powerful rocket, have also started at Sriharikota's Solid Stage Assembly Building for a liftoff in the next couple of months with the GSAT 29 communications satellite.

The high-power GSAT 11 broadband satellite, the largest spacecraft ever produced by India, is scheduled for launch in May aboard a European Ariane 5 rocket in French Guiana.

And Chandrayaan 2, a robotic lunar rover, is expected to launch on another GSLV Mk.2 rocket in October or November, about six months later than Indian officials had previously announced. That will be India's second moon mission, after a lunar orbiter launched in 2008.

The high-thrust Vikas engine tested on Thursday's mission, codenamed GSLV-F08, will be used again on the Chandrayaan 2 launch.

"This mission, GSLV-F08, has achieved two goals in one stroke," said S. Pandian, director of the ISRO Propulsion Complex. "One is first putting GSAT 6A in its designated slot, and second is (testing) whatever essential elements are required to have confidence on Chandrayaan 2. Those elements have been proved, like the High-Thrust Vikas Engine, electromechanical actuators, lithium-ion batteries, etc."

"We are going to have highly-accurate, high-resolution satellites for remote sensing," Sivan said of ISRO's missions this year. "We are going to have a high-bandwidth satellite for communications purposes. This is going to make a revolution in India.

"Along with that, the major mission this year is Chandrayaan," Sivan said.

[свернуть]

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Status Update of GSAT-6A

The second orbit raising operation of GSAT-6A satellite has been successfully carried out by LAM Engine firing for about 53 minutes on March 31, 2018 in the morning.

After the successful long duration firings, when the satellite was on course to normal operating configuration for the third and the final firing, scheduled for April 1, 2018, communication from the satellite was lost.

Efforts are underway to establish the link with the satellite.

Цитировать(https://img.novosti-kosmonavtiki.ru/29262.jpg)Jeff Foust‏ @jeff_foust (https://twitter.com/jeff_foust) 7 мин.7 минут назад (https://twitter.com/jeff_foust/status/980427615436787712)


ISRO reports it lost contact with the GSAT-6A satellite, launched Thursday, between the second and third orbit-raising maneuvers.

ЦитироватьIndia's Newly Launched GSAT-6A Communications Satellite Falls Silent after 2nd Orbit-Raising Burn
 April 1, 2018 (http://spaceflight101.com/gsat-6a-loss-of-contact/)

(https://img.novosti-kosmonavtiki.ru/152825.jpg) (http://spaceflight101.com/gslv-gsat-6a/wp-content/uploads/2018/04/gsat-6aundergoingacoustictest.jpg)
GSAT-6A during final Testing – Photo: Indian Space Research Organization

India's GSAT-6A military communications satellite has unexpectedly gone silent after conducting a major engine burn on Saturday, indicating a potentially serious onboard anomaly had occurred less than two days after the craft's successful launch atop a GSLV rocket. The Indian Space Research Organization confirmed the anomaly on Sunday and said ground controllers were working to restore communications with the spacecraft.

Спойлер

The advanced S-Band satellite enjoyed a flawless ride (http://spaceflight101.com/gslv-gsat-6a/gslv-f08-launch-success/) into orbit on Thursday atop India's Geosynchronous Satellite Launch Vehicle, achieving its fifth successful orbital delivery in a row since coming back fr om a major design overhaul in 2014. GSLV lifted off from India's Eastern Shore at 11:26 UTC and successfully demonstrated a new high-thrust engine on its second stage and a minimum propellant residuals shutdown technique on the third stage, injecting the 2,140-Kilogram satellite at the 1,050-second mark into the flight.

(https://img.novosti-kosmonavtiki.ru/152845.jpg) (http://spaceflight101.com/gslv-gsat-6a/wp-content/uploads/sites/218/2018/03/pade02h.jpg)
GSAT-6A Launches from Sriharikota – Photo: ISRO

Tracking data provided by the U.S. Joint Space Operations Center showed the satellite in an initial orbit of 149 by 36,499 Kilometers, inclined 20.68 degrees – in family with previous GSLV missions, though with a slight overshoot on apogee which indicated the MRS shutdown technique on the Cryogenic Upper Stage did deliver some additional performance. From its injection orbit, GSAT-6A was to conduct three apogee maneuvers with its Liquid Apogee Motor to reach a near-Geostationary Orbit for final drifting into its operational position at 83 degrees East, co-located with its sister craft GSAT-6 that launched in 2015.

ISRO reported on Friday that GSAT-6A had successfully carried out a 2,188-second (36-minute 28-second) firing of the Liquid Apogee Motor at 3:52 UTC. This burn by the 440-Newton LAM lifted the satellite into an orbit of 5,030 by 36,445 Kilometers and accomplished a large reduction of inclination to 11.96 degrees.

(https://img.novosti-kosmonavtiki.ru/152826.jpg) (http://spaceflight101.com/gslv-gsat-6a/wp-content/uploads/2018/04/gsat-6aundergoingemi-emctest.jpg)
Photo: ISRO

The next LAM burn was expected on Saturday morning, Indian time, and a report on its outcome was expected on ISRO's website later in the day. Instead came rumors from Indian journalists that something was amiss with the newly launched spacecraft. Several journalists reported that GSAT-6A had likely been struck by a power system problem and had become unresponsive to ground commands.

The Indian Space Research Organization released a statement on Sunday, informing that the second orbit-raising maneuver had been successfully carried out by GSAT-6A but communications with the satellite were lost not long after. "After the successful long duration firings, when the satellite was on course to normal operating configuration for the third and the final firing, scheduled for April 1, 2018, communication from the satellite was lost."

ISRO did not provide upd ated orbital parameters for GSAT-6A and the Joint Space Operations Center appears to have temporarily lost the satellite which is quite common after large altitude and inclination changes.

(https://img.novosti-kosmonavtiki.ru/152836.jpg) (https://img.novosti-kosmonavtiki.ru/152836.jpg)
Depiction of GSAT-6A in its fully deployed configuration – Image: ISRO

According to the Times of India, GSAT-6A continued sending data for four minutes after concluding its 53-minute LAM firing and then suddenly went silent. Initial analysis points to a power failure somewh ere on the spacecraft.

Indian press outlets reported a number of meetings were underway throughout the day on Saturday to diagnose the power system problem and work out whether onboard redundancies are available to work around the affected component or components.

The impact of the power failure on the GSAT-6A mission remains to be seen. First and foremost, ISRO will be working to restore two-way communications with the satellite to obtain telemetry in order to collect additional data on the issue.

Another line of inquiry to be followed by ISRO will be detailed commonality analysis to determine whether other satellites already in orbit or currently preparing for launch may suffer from the same condition. GSAT-6A employs the I-2K satellite platform suitable for spacecraft in the two-metric-ton range; however, a number of common components are shared across the different sizes of India's Geostationary satellite platforms.

The next satellite se t for launch is the IRNSS-1I navigation satellite, built on the smaller I-1K platform suited for launch on the country's PSLV rocket. India's Navic constellation suffered a setback in recent years due to a systemic problem affecting the atomic clocks used as ultra-precise timekeepers on the satellites.

(https://img.novosti-kosmonavtiki.ru/152824.jpg) (http://spaceflight101.com/gslv-gsat-6a/wp-content/uploads/2018/04/gsat11isro.jpg)
GSAT-11 – Image: ISRO

IRNSS-1A, the first constellation satellite launched in 2013, lost all of its redundant clocks and was left in a degraded state – of little use for high-precision navigation. The plan was for a replacement, IRNSS-1H, to be sent up in 2017, but the satellite fell victim to a rare failure of India's PSLV rocket (http://spaceflight101.com/pslv-c39/pslv-launch-failure-irnss-h/) – placing some pressure on the upcoming IRNSS launches to ensure the constellation can stay at operational strength.

GSAT-11, an advanced high-throughput satellite built on ISRO's largest satellite platform to date, arrived at the Guiana Space Center on Wednesday in preparation for launch in May. The 5,870-Kilogram satellite is the largest ever built in India and utilizes the I-6K satellite platform – advertised as a game-changer for Indian communications satellite technology. Assessments of common parts and manufacturing batches shared with GSAT-6A will likely be conducted before the satellite will receive final approval for launch atop an Ariane 5 rocket.

(https://img.novosti-kosmonavtiki.ru/152835.jpg) (http://spaceflight101.com/gslv-gsat-6a/wp-content/uploads/sites/218/2018/03/9896905_orig.jpg)
GSAT-6 Antenna Reflector – Photo: ISRO

For GSAT-6A, the plan was for three apogee burns followed by some fine tuning to reach a stationary position in the neighborhood of GSAT-6. Next, the satellite was to deploy its six-meter Unfurlable S-Band Antenna Reflector and begin a series of checkout before entering operational service – doubling the S-Band capacity for mobile communications available to the Indian government and armed forces.

GSAT-6A employs an 0.8-meter C-Band antenna that provides the gateway connection between the satellite and a hub station in India while two-way communications with mobile terminals are handed in S-Band via the large antenna reflector and five spot beams spread across the Indian subcontinent. Five 2.7 MHz S x C-Band transponders are responsible for the terminal-to-hub link while five 9 MHz C x S-Band transponders carry communications from the hub station to deployed terminals.

GSAT-6A was expected to join its nearly identical sister craft at an orbital position of 83 degrees East in Geostationary Orbit, to add additional capacity and ensure continuity of services into the second half of the 2020s via its expected ten-year operational life.

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Код Выделить Развернуть

1 43241U 18027A   18089.59621502  .00000063  00000-0  00000+0 0  9996
2 43241  11.9630 298.8482 5792905 179.3367 125.2368  1.94436707    3143241 / 2018-027A
Epoch (UTC) 2018-03-30 14:18:32, 5030 km x 36445 km x 11.963°, 740.60 min

ЦитироватьИСРО не прописано, что пошло не так. Сообщения, однако, предполагают, что глюк был связан с энергетической системой спутника после того, как вчера было проведено второе упражнение по поднятию орбиты, после которого, по сообщениям, руководство ISRO ушло в ловушку, чтобы все исправить.

Цитироватьgsat-6А был второй из серии спутников gsat, построенный индийской организацией космических исследований (Исро) для предоставления высокоскоростного доступа в интернет на мобильных устройствах для вооруженных сил.
Запуск спутника состоялся 29 марта. "Если нам не удастся восстановить контакт со спутником, миссия будет объявлена мертвой. В ходе расследования будет предпринята попытка найти первопричину зацепа. Кроме того, теперь будут гораздо более строгие проверки качества, чтобы подобные инциденты не повторялись", - сказал исро-ученый. "Это означает, что будет задержка в строительстве других спутников."
Исро уже выстроились более 10 пусков, в том числе и gsat-7А, спутники дистанционного зондирования снимок cartosat-3, Oceansat-3 и Чандраян-2, луна миссии космическое агентство планирует посадить луноход на спутник Земли. 

Цитировать(https://img.novosti-kosmonavtiki.ru/67516.jpg)Jonathan McDowell‏Подлинная учетная запись @planet4589 (https://twitter.com/planet4589) 11 ч. назад (https://twitter.com/planet4589/status/981016215844982785)

The @ISRO (https://twitter.com/isro) GSAT-6a communications satellite is being tracked in a 25979 x 36368 km x 3.3 deg orbit, the first orbit data since its 2nd apogee burn. Contact with the satellite was lost just after the burn and as far as I know has not yet been regained

ЦитироватьАпр 03, 2018, 04.13 pm IST 

gsat-6А остались без связи с внешним миром на третий день после его запуска, даже как он двигался над Африкой, а затем к южной оконечности Индии, Сингапур, Папуа-Новая Гвинея и над Тихим океаном в понедельник.
Данные из США-канадского североамериканского аэрокосмического оборонного командования (Норад) показали все три этапа размещения его на орбите прошла без сучка и задоринки.
Источники сказали, что не было никаких признаков каких-либо неисправностей системы или колебаний во время или после запуска. "Каждый раз, когда есть несоответствие, есть признаки. На этот раз, он не мог увидеть или почувствовать, вот почему он принимает больше времени для установления контакта," председатель Исро к Сиван (https://z5h64q92x9.net/proxy_u/en-ru.ru/https/economictimes.indiatimes.com/topic/K-Sivan) сказал. 
Норад данных показала отсутствие функциональных или орбитальных проблем, как сейчас. "Проблема, похоже, в области применения космического аппарата", - сказал он. Источники сказали, что если спутник все-таки вернется на рельсы, у него будет достаточно топлива, чтобы добиться прогресса. Отрадно, что последняя связь со спутником показала хорошее состояние здоровья всех систем.

ЦитироватьISRO loses contact with new communications satellite             
 April 3, 2018 (https://spaceflightnow.com/2018/04/) Stephen Clark (https://spaceflightnow.com/author/stephen-clark/)           
 (https://img.novosti-kosmonavtiki.ru/144219.jpg)GSAT 6A before encapsulation inside the GSLV Mk.2 rocket's payload fairing. Credit: ISRO

Ground controllers have lost contact with an Indian communications satellite launched last week, and Indian news reports suggest engineers believe the spacecraft's power system is at fault.
The GSAT 6A communications satellite completed two orbital adjustment maneuvers following its launch Thursday aboard India's Geosynchronous Satellite Launch Vehicle, but engineers at the mission control center in Hassan, India, suddenly lost contact with the spacecraft Saturday.
The Indian Space Research Organization confirmed Sunday that GSAT 6A ran into trouble shortly after a second major orbit-raising burn by the satellite's main engine.
"Efforts are underway to establish the link with the satellite," ISRO said in a statement.
The GSLV Mk.2 rocket successfully placed the GSAT 6A spacecraft into a preliminary elliptical geosynchronous transfer orbit that took the satellite as close as 92 miles (149 kilometers) fr om Earth to as far as around 22,685 miles (36,508 kilometers).
ISRO managers said after Thursday's launch that GSAT 6A extended its solar panels and started generating its own electricity.

Спойлер

(https://img.novosti-kosmonavtiki.ru/144179.jpg)Artist's concept of the GSAT 6A satellite in orbit. Credit: ISRO

GSAT 6A's final operating orbit was planned to be at an altitude of nearly 22,300 miles (35,800 kilometers) over the equator, wh ere the laws of astrodynamics allow a satellite to move in its orbit at the same speed of Earth's rotation. Such geosynchronous orbits are ideal for most large data relay and television broadcast satellites.
The satellite's flight plan called for three burns of its on-board engine to circularize its orbit at geosynchronous altitude, and shift GSAT 6A's orbital track from one that oscillated between 20.7 degrees north and south latitude, to a position directly over the equator.
ISRO officials said the first two burns went according to plan, but controllers lost communications with GSAT 6A after the second maneuver.
K. Sivan, ISRO's chairman, told the Time of India newspaper that the satellite should have reset and entered a "safe mode" if it encountered a problem. Controllers should have been able to establish communications with GSAT 6A if it was in safe mode.
The Times of India reported the problem could be related to GSAT 6A's power system, and engineers were still trying to contact the satellite Tuesday.
 (https://img.novosti-kosmonavtiki.ru/144376.jpg)India's GSLV Mk.2 rocket lifts off with the GSAT 6A communications satellite. Credit: ISRO

GSAT 6A is currently flying in an elongated orbit ranging between around 16,150 miles (26,000 miles) and approximately 22,600 miles (36,370 kilometers), with its track tilted 3.3 degrees to the equator.
A third engine burn was planned to finish circularizing GSAT 6A's orbit.
Once GSAT 6A arrived in its final orbit, officials planned to park the satellite along the equator at 83 degrees east longitude, unfurl a 20-foot (6-meter) S-band antenna, and complete post-launch checkouts before entering operational service.
Valued at more than $41 million, GSAT 6A was designed for a 10-year mission providing communications services for remote users, including Indian government agencies and the Indian military. Its sister satellite, GSAT 6, launched in August 2015.
"These two satellites combined are going to provide a platform for development of advanced technologies, such as unfurlable antennas, hand-held devices and ground networks for two-way point-to-point satellite communications," Sivan said in remarks following Thursday's launch.
India is planning a busy year of launches, a pace that is set to continue as soon as April 12 with the liftoff of a Polar Satellite Launch Vehicle with an Indian navigation satellite.
A broadband communications satellite — India's most powerful telecom spacecraft — is set for launch in May on a European Ariane 5 rocket. India's Chandrayaan 2 lunar rover is also scheduled for liftoff on a GSLV Mk.2 rocket before the end of the year.
Although GSAT 6A's fate remains unknown, it is the second Indian space mission in less than a year to suffer a major problem.
India lost the IRNSS 1H navigation satellite during a failed PSLV flight in August 2017. The spacecraft was stranded on its launcher when the PSLV's payload shroud failed to jettison a few minutes after liftoff.

[свернуть]

Цитировать(https://img.novosti-kosmonavtiki.ru/185687.png)NewSpace India‏ @NewSpaceIndia (https://twitter.com/NewSpaceIndia) 5 ч.5 часов назад (https://twitter.com/NewSpaceIndia/status/982408378315030528)


Preliminary analysis indicates no problem with onboard systems of GSAT-6A, spacecraft likely went into safe mode due to some 'external disturbance' says K Sivan. Attempts at revival still on, future missions unaffected.

ЦитироватьLiss пишет:
 на орбите 25981x36368 км с периодом 1207 мин.

ЦитироватьСтарый пишет:

ЦитироватьLiss пишет:
 на орбите 25981x36368 км с периодом 1207 мин.

Уууу! Так это ж взрыв при включении апогейного двиателя.

ЦитироватьLiss пишет: 
С чего вдруг? На нем апогейный ЖРД, и подъем перигея со снижением наклонения производится несколькими последовательными импульсами. Два он выдал и после этого замолк. Взрыва для этого вовсе не нужно, это излишняя драматизация :-)

ЦитироватьWe now know the exact location of GSAT-6A communication satellite, says Isro chief

Surendra Singh (https://timesofindia.indiatimes.com/toireporter/author-Surendra-Singh-30991123.cms)| TNN | Updated: Apr 10, 2018, 22:47 IST

NEW DELHI: Indian Space Research Organisation (https://timesofindia.indiatimes.com/topic/Space-Research-Organisation) (Isro (https://timesofindia.indiatimes.com/topic/ISRO)) now knows the exact location of communication satellite GSAT-6A (https://timesofindia.indiatimes.com/topic/GSAT-6A) with which the signal link got snapped soon after its launch from Sriharikota (https://timesofindia.indiatimes.com/topic/south-asia-satellite) on March 29.

Talking to TOI, Isro chairman Dr K Sivan (https://timesofindia.indiatimes.com/topic/Dr-K-Sivan) said, "With the help of the satellite tracking system and other sources, we now know the exact location of GSAT-6A. Earlier, we were searching in the dark. But now we know the exact position of the satellite and keeping a close watch on its movement round-the-clock.

We are hopeful that at a particular orientation, it will capture the signal from the ground station and communication will be restored. Currently, GSAT-6A is moving in the geo transfer orbit at perigee of around 26,000km and apogee of about 33,000km."

On the power front, Dr Sivan said, "We expect that the satellite has the power as its solar panels are fully deployed and getting recharged."

ЦитироватьGSAT-6A located, hope to re-establish communication link: ISRO chairman

Isro chairman K Sivan speaks about the Chandrayaan II mission, first solar mission Adiyta L1 and his plans for India's space organisation.

INDIA (https://www.hindustantimes.com/india-news/) Updated: Apr 19, 2018 07:55 IST
Malavika Vyawahare
Hindustan Times

...
Is there any news about the GSAT 6A?

The launch was successful. The most tricky complex phase is the launch vehicle phase. Subsequently the satellite will take its own course, even if there are some issues we have time to correct them. Whereas the launch vehicle is a one time affair, if there is some problem it is gone.

For low earth orbit satellites the launch vehicle will inject the satellite into the correct orbit. In a case like the GSAT-6A the launch vehicle will place satellite into an orbit that is convenient for the vehicle, then satellites will use its own systems to take it further.

For GSAT-6A this problem happened during orbit raising manoeuvres when we lost communication (https://www.hindustantimes.com/india-news/isro-loses-contact-with-communication-satellite-gsat-6a-efforts-on-to-establish-link/story-321gnmEKtQ8532UuLIY2TN.html). But we have located the satellite, we are hoping to re-establish the communication link.
...

ЦитироватьPower system failure cost Isro GSAT-6A: VSSC chief

"We have already analysed and understood what could have gone wrong.The power system comprises the solar panel, battery and circuit."

T Ramavarman (https://energy.economictimes.indiatimes.com/author/479215338/t-ramavarman)  |  TNN  |  April 19, 2018, 15:06 IST

THRISSUR: A failure in the power system could have led to the Indian Space Research Organization (https://energy.economictimes.indiatimes.com/tag/indian+space+research+organization) (Isro (https://energy.economictimes.indiatimes.com/tag/isro)) losing contact with the recently launched GSAT-6A communication satellite, a senior official of the Vikram Sarabhai Space Centre (https://energy.economictimes.indiatimes.com/tag/vikram+sarabhai+space+centre)(VSSC (https://energy.economictimes.indiatimes.com/tag/vssc)) said on Wednesday. 

"We have already analysed and understood what could have gone wrong. The power system comprises the solar panel, battery and circuit. We assume a short has happened in the electrical circuit," VSSC director S Somanath (https://energy.economictimes.indiatimes.com/tag/s+somanath) said, adding that the protection circuits might not have become functional on time, leading to the damaging of wires.

He was speaking to reporters on the sidelines of the inauguration of the Isro pavilion at the Thrissur Pooram exhibition. Ruling out a possible sabotage, Somanath said that all systems were tested at various stages. He added that the scientists were still trying to control the satellite.

"We located the satellite immediately after the loss of contact, we are continuing to see the satellite, and we are trying to send some commands. But the satellite is tumbling, and is not under control. We hope that one day it will start receiving commands and we will be able to bring it to a safe mode. In the past, some satellites have responded after months of remaining out of contact,'' the VSSC director said. ...