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Цитировать(https://img.novosti-kosmonavtiki.ru/29906.jpg)Andrew Jones‏ @AJ_FI (https://twitter.com/AJ_FI) 58 мин. назад (https://twitter.com/AJ_FI/status/983588780421640192)

Well, China just sneakily launched 3 Yaogan-31 reconnaissance satellites into orbit from Jiuquan, using a Long March 4C rocket. That's 11 for 11 in 2018 for China. Launch was at 12:25 local, 04:25 UTC.
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Спойлер

(https://img.novosti-kosmonavtiki.ru/162790.jpg)
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Цитировать(https://img.novosti-kosmonavtiki.ru/29906.jpg)Andrew Jones‏ @AJ_FI (https://twitter.com/AJ_FI) 49 мин. назад (https://twitter.com/AJ_FI/status/983591754388639744)

Also on board was a 'micro/nano technology test satellite' (微纳技术试验卫星).
(https://img.novosti-kosmonavtiki.ru/162793.jpg)

Спойлер

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Цитировать(https://img.novosti-kosmonavtiki.ru/29906.jpg)Andrew Jones‏ @AJ_FI (https://twitter.com/AJ_FI) 15 мин. назад (https://twitter.com/AJ_FI/status/983601119380242432)

Some video action of today's Long March 4C launch of 3 x Yaogan-31 recon sats and a tiny tech test sat from Jiuquan.
https://video.twimg.com/tweet_video/DaZz79bXcAAMeci.mp4 (https://video.twimg.com/tweet_video/DaZz79bXcAAMeci.mp4)(video 0:09)

Цитировать(https://img.novosti-kosmonavtiki.ru/234454.jpg) (https://img.novosti-kosmonavtiki.ru/234454.jpg)
▲ 圆满成功

4月10日12点25分，在酒泉卫星发射中心，长征四号丙运载火箭成功执行"一箭四星"发射任务，将遥感卫星三十一号01组卫星及微纳技术试验卫星顺利送入预定轨道。

Цитировать▲ Полный успех

В 12:25 10 апреля, из Центра запуска спутников Цзюцюань ракета-носитель "Великий Поход-4C" успешно вывела на запланированную орбиту 01-ю группу КА дистанционного зондирования Яогань-31 и микронанотехнологический экспериментальный спутник.

ЦитироватьChina launches Yaogan-31 remote sensing satellites
Source: Xinhua | 2018-04-10 13:34:12 | Editor: Mengjie

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Спойлер

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A Long March-4C rocket carrying the first group of China's Yaogan-31 remote sensing satellites and a micro nano technology experiment satellite is launched from Jiuquan Satellite Launch Center in northwest China's Gansu Province, April 10, 2018. (Xinhua/Wang Jiangbo)

JIUQUAN, April 10 (Xinhua) -- The first group of China's Yaogan-31 remote sensing satellites were sent into space on Tuesday at 12:25 p.m. Beijing time from Jiuquan Satellite Launch Center in northwestern China.

The satellites were carried by a Long March-4C rocket, the 271st mission for the Long March rocket family.

The mission also sent a micro nano technology experiment satellite into orbit.

The satellites will be used for electromagnetic environment surveys and other related technology tests.

China launched the first "Yaogan" series satellite, Yaogan-1, in 2006.

ЦитироватьВ Китае успешно запущена первая группа спутников дистанционного зондирования Земли "Яогань-31"
2018-04-10 16:20:37丨Russian.News.Cn

Цзюцюань, 10 апреля /Синьхуа/ -- Во вторник в 12:25 при помощи ракеты-носителя "Чанчжэн-4С" с космодрома Цзюцюань на северо-западе Китая был успешно произведен запуск первой группы спутников дистанционного зондирования Земли "Яогань-31". Спутники выведены на намеченную орбиту.

Вместе со спутниками "Яогань-31" в космос был запущен экспериментальный нанотехнологический спутник. Аппараты будут использоваться для зондирования электромагнитной среды и проведения соответствующих технических испытаний.

Как стало известно, это 271-й полет ракет-носителей серии "Чанчжэн" /"Великий поход"/. -0-

ЦитироватьSurprise launch sees China loft three Yaogan-31 reconnaissance satellites from Jiuquan
by Andrew Jones (https://gbtimes.com/authors/658) | Apr 10, 2018 11:31 | JIUQUAN (https://gbtimes.com/tag/jiuquan) ● CASC (https://gbtimes.com/tag/casc) ● GOBI DESERT (https://gbtimes.com/tag/Gobi%20Desert)

(https://static.gbtimes.com/uploads/old/2016/08/10/yaogan-16-long-march-4c-jiuquan-slc-20121125-2.jpg)
A trio of Yaogan-16 satellites being launched from the Jiuquan Satellite Launch Centre in November 2012 by a Long March 4C rocket. CNS

China orchestrated the previously unannounced launch of three Yaogan-31 reconnaissance satellites and a technology test satellite via a Long March 4C rocket from the Jiuquan Satellite Launch Centre on Tuesday.

Launch from the site in the Gobi Desert took place at 12:25 local time (04:25 UTC) on April 10, with no indication of an imminent launch, usually signalled by airspace closure notices.

The China Aerospace Science and Technology Group (CASC), the main contractor for the country's space programme, announced the success of the launch around 90 minutes after liftoff.

Спойлер

The launch was China's 11th of 2018, all of which have been successful. The country aims to launch around 40 times this year (https://gbtimes.com/china-to-attempt-more-than-40-space-launches-in-2018-including-long-march-5-and-lunar-far-side-missions), including government and commercial missions.

Yaogan satellites

The Yaogan-31 satellites will be used for electromagnetic environment surveys and other related technology tests, according to Chinese media reports. International observers perceive the Yaogan satellite series to be designed for reconnaissance purposes for China's People's Liberation Army (PLA). The launch follows that of a fourth group of Yaogan-30 triplet satellites (https://gbtimes.com/chinas-fifth-launch-of-january-puts-three-yaogan-30-reconnaissance-satellites-and-nanosat-1a-in-orbit)in January from Xichang.

No information concerning the fourth passenger on the flight, a 'micro-nano experiment satellite', was immediately available.

(https://img.novosti-kosmonavtiki.ru/191936.png)
Stacking the Long March 4C rocket in preparation for the launch of three Yaogan-31 satellites from Jiuquan in April 2018. CASC

The Long March 4C was developed and manufactured by the Shanghai Academy of Spaceflight Technology (SAST), a CASC subordinate. The rocket carried out China's previous launch, lifting three Gaofen-1 (https://gbtimes.com/china-moves-to-10-for-10-in-2018-with-launch-of-three-gaofen-earth-observation-satellites) Earth observation satellites into orbit from Taiyuan on March 31.

Gaofen satellites are understood to be the civilian counterparts to Yaogan satellites, which are believed to be for military purposes. Gaofen-5 (http://space.skyrocket.de/doc_sdat/gf-5.htm) is expected to also launch this month.

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Цитировать(https://img.novosti-kosmonavtiki.ru/186040.jpg)Chris B - NSF‏ @NASASpaceflight (https://twitter.com/NASASpaceflight) 39 сек. назад (https://twitter.com/NASASpaceflight/status/983653847418769408)

ARTICLE: Surprise Chinese launch of the Yaogan Weixing-31-01 mission -

https://www.nasaspaceflight.com/2018/04/surprise-chinese-launch-yaogan-weixing-31-01/ ... (https://t.co/0wwtJVZlbC)

- by Rui C. Barbosa (@rmcsbarbosa (https://twitter.com/rmcsbarbosa))
(https://img.novosti-kosmonavtiki.ru/162430.jpg)

ЦитироватьБезумный Шляпник пишет:
Похоже, что в плоскость к тройке YG-17.
Если так - тогда группировка сейчас составляет шесть троек попарно в трех плоскостях: YG9+YG20, YG16+YG25 и YG17+YG31

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ID	编号	历时(UTC)	运行周期(分/圈)	轨道倾角	近地点 X 远地点
2018-034A	43275	2018.04.10 09:11:44	107.15 min	63.407	1090 x 1100 km
2018-034B	43276	2018.04.10 09:45:24	107.13 min	63.403	1089 x 1100 km
2018-034C	43277	2018.04.10 11:31:39	107.12 min	63.404	1088 x 1100 km
2018-034D	43278	2018.04.10 11:38:04	105.82 min	63.451	958 x 1109 km
2018-034E	43279	2018.04.10 11:31:39	107.10 min	63.408	1085 x 1100 km
2018-034F	43280	2018.04.10 09:45:09	107.10 min	63.405	1086 x 1100 km

ЦитироватьFirst batch of Yaogan-31 optical satellites launched into space

CGTN (https://www.youtube.com/channel/UCgrNz-aDmcr2uuto8_DL2jg)

Опубликовано: 10 апр. 2018 г.

China's first batch of Yaogan-31 optical satellites has been launched into space from the Jiuquan Satellite Launch Center in northwestern China.

ЦитироватьFirst batch of Yaogan-31 optical satellites launched into space

ЦитироватьChinese Long March 4C rocket deploys four satellites in orbit
April 10, 2018 (https://spaceflightnow.com/2018/04/) | Stephen Clark (https://spaceflightnow.com/author/stephen-clark/)

(https://img.novosti-kosmonavtiki.ru/144220.jpg)
A Long March 4C rocket lifts off Tuesday with four satellites. Credit: Xinhua

Three Chinese military surveillance spacecraft and an experimental nanosatellite rode a Long March 4C rocket into orbit Tuesday.

The Long March 4C rocket took off at 0425 GMT (12:25 a.m. EDT; 12:25 p.m. Beijing time) from the Jiuquan space center located in the Inner Mongolia region of northwestern China, according to the China Aerospace Science and Technology Corp.

The three-stage, liquid-fueled rocket placed four satellites in an orbit around 680 miles (nearly 1,100 kilometers) above Earth, with an inclination of 63.4 degrees to the equator, according to tracking data published by the U.S. military.

The trio of Yaogan 31 military payloads are believed by Western analysts to be maritime reconnaissance satellites, helping Chinese military authorities track foreign naval movements. A nanosatellite that launched with the Yaogan 31 payloads will conduct unspecified technological experiments in space, Chinese state media reported.

Спойлер

Five previous Chinese launches in 2010, 2012, 2013 and 2014 carried similar triplets of satellites into orbit under the Yaogan name, which is likely a codename for the country's military spy satellites.

All of the earlier missions used Long March 4C rockets launched from Jiuquan to place satellite triplets into the same 680-mile-high orbit inclined 63.4 degrees to the equator.

Tuesday's launch was a surprise to outside observers. China did not reveal plans for the mission through airspace closure notices, as it does for most space launches.

The launch Tuesday was the 11th for China this year — all successful. The country's space program aims for up to 40 space launches in 2018.

China's previous space launch March 31 also flew aboard a Long March 4C rocket, placing three Gaofen Earth-imaging satellites in orbit. The Gaofen series of Earth observations satellites are believed to be civilian-operated versions of the Yaogan satellite fleet, which are devoted to military purposes.

The China Aerospace Science and Technology Corp. said some members of the Long March 4C launch team will next travel to the Xichang space base in southwestern China to prepare for the liftoff of a communications relay craft for the Chang'e 4 lunar rover, which will attempt the first robotic landing on the far side of the moon late this year.

The Chang'e 4 relay satellite is scheduled for launch as soon as next month.

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ЦитироватьLong March-4C launches Yaogan-31 01 satellites (长征四号丙 / 遥感三十一)

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

Опубликовано: 10 апр. 2018 г.

ЦитироватьChinese Surprise Launch Lifts Yaogan-31 Electronic Reconnaissance Satellite Trio
 April 11, 2018 (http://spaceflight101.com/china-long-march-4c-yaogan-31-01-launch/) 

(https://img.novosti-kosmonavtiki.ru/154336.jpg) (http://spaceflight101.com/wp-content/uploads/2018/04/Yaogan-31-01-Launch1.jpg)
Photo: Xinhua

China pulled off a completely secretive space launch on Tuesday, firing into orbit a trio of naval reconnaissance satellites and a small technology test satellite via a Long March 4C rocket. China's eleventh launch of the year occurred at 4:25 UTC from the Jiuquan Satellite Launch Center in the Gobi Desert and orbital data confirmed the identity of the three Yaogan-31 satellites as a ship-tracking mission in line with previous Yaogan triplet launches.

No information on the launch was available beforehand and airspace closures were particularly cryptic in nature and did not allow them to be tied to space launch activity out of Jiuquan, located in Inner Mongolia. The China Aerospace Science and Technology Group (CASC) announced the success of the launch a little over 90 minutes after liftoff and tracking data showed the Yaogan-31-01 satellite group in an orbit of 1,090 by 1,100 Kilometers at an inclination of 63.4°, consistent with the country's naval reconnaissance satellite system.

Спойлер

(https://img.novosti-kosmonavtiki.ru/154306.jpg) (https://img.novosti-kosmonavtiki.ru/154306.jpg)
Image: Xian Satellite Control Center

Yaogan is China's primary reconnaissance program operated in Low Earth Orbit and consists of optical imaging and radar satellites as well as electronic intelligence satellites.

Comprising three members, the Yaogan-31-01 group is officially advertised "for electromagnetic environment surveys and other related technology tests." However, based on previous missions flying under the Yaogan designation and the orbit shown for the satellites, it is certain their real mission is of a military nature in the field of naval reconnaissance by pin-pointing the location of foreign ships by triangulating their radio emissions.

Yaogan was inaugurated in April 2006 with the launch of the first Synthetic Aperture Radar satellite for all-weather, round-the-clock imaging. The first optical satellite was launched in 2007 and the first triplet launch occurred in 2009 to mark the addition of an electronic-reconnaissance segment to Yaogan.

(https://img.novosti-kosmonavtiki.ru/154338.jpg) (http://spaceflight101.com/wp-content/uploads/2018/04/Yaogan-Legault.jpg)
Yaogan 16 Trio imaged by Thierry Legault in 2014 – Click here for Video (https://www.youtube.com/watch?v=TuPU04FiDOM)

Flying in precise triangular formations in an orbit of 1,080 by 1,000 Kilometers inclined 63.4°, the Yaogan triplets closely resemble the architecture of the original version of the U.S. Naval Ocean Surveillance System (NOSS). Using three satellites in a precise formation allows them to intercept radio signals from the ground and so calculate and track the position of warships in the world's oceans while also studying their activity based on their radio emissions.

The hypothesis of the Yaogan Triplets being China's Naval ELINT program was firmed up in 2012 when the next satellite trio, Yaogan 16, went up into a second orbital plane about 71 degrees west to that of Yaogan 9. Further expanding the constellation, China launched three Yaogan 17 satellites in 2013 into a plane 75 degrees east of Yaogan 9 – creating a fully operational system that closely resembles the pattern of NOSS satellites launched by the United States in 2007, 2011 and 2012, using a 74-degree spacing between planes.

(https://img.novosti-kosmonavtiki.ru/154340.jpg) (http://spaceflight101.com/wp-content/uploads/2018/04/Yaogan-Triplets2.jpg)
Orbital Planes of Yaogan Triplets – Image: Spaceflight101/JSatTrak

The Yaogan 20 and 25 launches in 2014 lifted their satellites into the orbital planes of Yaogan 9 and 16, likely in an effort to expand the constellation for faster revisit times and to ensure continuity of service should one triplet go out of service. Tuesday's launch placed its satellites in a quasi-co-planar orbit with Yaogan 17; the reason for this plane being replenished a full four years after the other two is not known.

According to orbital tracking data collected by the Joint Space Operations Center, all Yaogan triplets launched between 2009 and 2014 remain in triangular formation, indicating all remain in operation, spaced in three orbital planes with two active groups per plane.

China's Yaogan series saw a number of additions in recent months under the Yaogan-30 designation (http://spaceflight101.com/tag/yaogan-30/), involving triplet launches of a different nature than the Chinese NOSS-equivalent in that the Yaogan-30 constellation does not employ close formations of satellites and instead spaced its members evenly along their orbital planes to create a rapid-revisit constellation at an inclination of 35 degrees – suspected to be for tactical reconnaissance gathering. Whether Yaogan-30 involves electronic intelligence, optical imaging or a combination of the two remains up for debate.

(https://img.novosti-kosmonavtiki.ru/154339.jpg) (http://spaceflight101.com/wp-content/uploads/2018/04/Yaogan-Triplets1.jpg)
Image: Spaceflight101/JSatTrak

The designation of Yaogan-31-01 A/B/C for the latest group of satellites lifted into orbit may be an indication that additional Yaogan-31 groups can be expected in the future as China apparently changed its naming convention for multi-satellite systems as evident in the Yaogan-30 program and the recent additions to the civilian Gaofen program. (http://spaceflight101.com/long-march-4c-launches-three-gaofen-1-satellites/)

Tuesday's launch also carried a micro/nano technology test satellite as a secondary payload; however, no designation has emerged for the small satellite.

Tuesday's mission was the 271st launch of the Long March rocket family, according to Chinese state media, and the 23rd for the Long March 4C variant.  Long March 4C is derived from the CZ-4B Launcher, but features a re-startable upper stage and can accommodate a larger Payload Fairing. It is operated from the Jiuquan and Taiyuan Satellite Launch Centers.

CZ-4C has a liftoff mass of 250,000 Kilograms and is 45.8 meters in length with a diameter of 3.35 meters. It features several improvements over the CZ-4B such as new telemetry, tracking, control, and self-destruction systems that are smaller in size.

(https://img.novosti-kosmonavtiki.ru/154337.jpg) (http://spaceflight101.com/wp-content/uploads/2018/04/Yaogan-31-01-Launch3.jpg)
Photo: Xinhua

The first stage of the vehicle is powered by a YF-21B Rocket Engine which consists of a cluster of four YF-20B Engines each providing 814 Kilonewtons of Vacuum Thrust

At liftoff, the YF-21B provides a thrust of 2,962 Kilonewtons generating a total Thrust-to-Weight ratio of 1.21. The Engine Assembly has a weight of 2,850 Kilograms, is 3.3 meters in length and 3.5 meters in diameter. The engine nozzles are gimbaled for vehicle control. All three Stages of the vehicle use Nitrogen Tetroxide as oxidizer and Unsymmetrical Dimethylhydrazine as fuel. The first stage has a liftoff mass of 193,300 Kilograms including 183,300 Kilograms of propellants. It is 24.7 meters in length.

The second stage of the vehicle is powered by a YF-22B Main Engine providing 738 Kilonewtons of thrust and a four-chamber vernier yet designated YF-23F providing 46 Kilonewtons of thrust. The main engines is fixed while the four vernier nozzles can be gimbaled for attitude control during powered flight. The stage is 10.4 meters long and holds 35,370 Kilograms of storable propellants. Both, the first and second stage, are based on components that are flown on other CZ Rockets. The third stage however, is a specially designed rocket stage for the Long March 4C and its purposes.

The stage is 4.9 meters long and has a reduced diameter of 2.9 meters. Liftoff mass is 14,560 Kilograms including 12,800 Kilograms of propellants. It uses a 98-Kilonewton YF-40 Rocket Engine. YF-40 has a dry weight of approximately 166 Kilograms and a diameter of 0.65 meters. It provides re-ignition capability to the vehicle in order to target a variety of orbits and provide precise injection capabilities.

Long March 4C is capable of delivering payloads of up to 4,200 Kilograms to Low Earth Orbit. Sun Synchronous Orbit capability is 2,800 Kilograms and Payloads of up to 1,500 Kilograms can be delivered to Geostationary Transfer Orbit by the Long March 4C.

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Цитировать(https://img.novosti-kosmonavtiki.ru/29906.jpg)Andrew Jones‏ @AJ_FI (https://twitter.com/AJ_FI) 4 ч. назад (https://twitter.com/AJ_FI/status/984373032763510784)

Apparent first stage wreckage from Tuesday's launch of a Long March 4C rocket from Jiuquan, found in Jingyuan county, Gansu province. #spacedebris (https://twitter.com/hashtag/spacedebris?src=hash) nevermind #Tiangong1 (https://twitter.com/hashtag/Tiangong1?src=hash) https://gbtimes.com/surprise-launch-sees-china-loft-three-yaogan-31-reconnaissance-satellites-from-jiuquan ... (https://t.co/pAwX0upn0T)
https://video.twimg.com/tweet_video/Dakx5S5WkAA0NTu.mp4 (https://video.twimg.com/tweet_video/Dakx5S5WkAA0NTu.mp4)
(video (https://video.twimg.com/tweet_video/Dakx5S5WkAA0NTu.mp4) 0:10)