Mangalyaan (спутник Марса) - PSLV-C25 - 05.11.2013 13:08 ЛМВ - Шрихарикота

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Я апогей имел ввиду, сорри. Смысл в том, что перигей при этом будет проходится быстрее и времени на импульс будет меньше.
 Насчет 10 градусов. Если финальный импульс будет чамую малость больше v2, тогда, да, парабола будет мало отличаться от эллипса. Но в этом случае мы не попадем на гоман, а останемся на орбите лизкой к Земной. Соответственно нам надо в перигее набрать v2 + сколько там на гоман нынче надо, 3кмс? А чем больше будет этот плюс, тем сильнее будет разгибаться парабола. Это опять же, если импульс будет сгновенным. Если импульс динный, то эллипс будет еще и оттягиваться(разворачиваться) в направлении разгона. Так что всё не так очевидно. И уж совершенно точно, что если б.п.ось опорого эллипса будет по касательной к орбите земли, то улетим вообще не туда.
 
Кстати, время начала окончания предпоследнего и финального импульса есть у нас? Что мы мучаемся-то?
upd. Ага, все импульсы ночью, в первой половине. так что всё правильно на картинке.
 
upd2. вообще пишут, что при старте с Земли к Марсу по Гоману, надо будет гиперболическую скорость поиметь. Отсюда и всё.

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01-12-2013   

Medium Gain Antenna of the Mars Orbiter Spacecraft is powered for long distance communication, subsequent to successful Trans Mars Injection (TMI) manoeuvre

02-12-2013   

Spacecraft has travelled a distance of 5,36,000 km by 17:00 hrs (IST) of Dec 2, 2013. It has crossed the distance to Moon's orbit around Earth (mean distance 3,85,000 km) this morning.

04-12-2013   

Spacecraft has traversed beyond the Sphere of Influence (SOI) of Earth extending about 9,25,000 km at around 1:14 hrs (IST) on Dec 4, 2013.

http://www.isro.org/mars/updates.aspx

[napalm]

Что-то цифры по расстоянию странные ..

[Александр Ч.]

Одна запятая лишняя.

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11-12-2013   

The first Trajectory Correction Manoeuvre (TCM) of Spacecraft was carried out successfully at 06:30 hrs (IST) by firing the 22 Newton Thrusters for a duration of 40.5 seconds. The spacecraft is travelling at a distance of about 29 lakh (2.9 million) km away from Earth.

http://www.isro.org/mars/updates.aspx

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December 16, 2013

Caution Against Forged Social Media Profiles Floated in the Name of ISRO/Department of Space

ISRO started an official page on Facebook titled ISROs Mars Orbiter Mission ( https://www.facebook.com/isromom ) on October 22, 2013, to provide near real time authentic information about the programme.

It is observed that a number of pages in the social media (Facebook and Twitter) are floated in the name of ISRO / Department of Space/ Mangalyaan, etc., which have no authenticity and ISRO does not take any responsibility for any content hosted on these pages. Some of these FORGED pages are:

https://www.facebook.com/isro.org
https://www.facebook.com/pages/ISRO-Indian-Space-Research-Orgaisation/123014641053950
https://twitter.com/Mangalyaan1
https://twitter.com/ISRO_India
https://twitter.com/ISROBhuvan
Such impersonation of the organisation is construed to be a serious offence and stern legal actions against these pages/administrators of these pages are being initiated from ISRO/Department of Space to bring them to immediate closure.

http://www.isro.gov.in/pressrelease/scripts/pressreleasein.aspx?Dec16_2013

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Isro uses new method to locate Mars Orbiter Mission
Dec 26, 2013, 07.10AM IST

MUMBAI: Isro has employed a new method for the first time to locate the Mars Orbiter Mission (MOM) — currently over 65 lakh km away from earth.

According to Isro, the pointing direction of the ground station antenna directly gives the angular location of the spacecraft. "However, the accuracy one can achieve using this method is insufficient for interplanetary missions with stringent navigation requirements," Isro said in a statement.

The statement said that is why a new method was used on Tuesday. This involves receiving MOM's radio signals at two widely separated ground stations at different instances. The system is called "Delta differential one way ranging". The results were very satisfactory, Isro said.

Besides the Indian Deep Space Network at Byalalu near Bangalore, Nasa's communication facilities at Goldstone in California, Madrid and Canberra are also supporting MOM.

http://articles.timesofindia.indiatimes.com/2013-12-26/science/45591752_1_mars-orbiter-mission-isro-indian-deep-space-network

[Salo]

http://www.business-standard.com/article/current-affairs/mars-orbiter-mission-completes-100-days-114021200100_1.html

Mars Orbiter Mission completes 100 days

Isro says health parameters of all the payloads are normal
T E Narasimhan
February 12, 2014 Last Updated at 07:28 IST

India's first interplanetary probe completes 100 days of its mission on Wednesday. The Mars Orbiter Spacecraft, which was launched by PSLV-C25 at 1438 hours on November 5, 2013 fr om Satish Dhawan Space Centre, Sriharikota, is in its voyage towards Mars, the mission successfully completes 100 days in space today. Isro said the health parameters of all the payloads are normal.
 
The spacecraft is at a radio distance of 16 million km causing a one-way communication delay of approximately 55 seconds. After travelling the remaining distance of about 490 million km over the next 210 days, the spacecraft would be ins erted in to the Martian orbit on September 24, 2014.
 
Subsequent to six orbit raising manoeuvres around the Earth following the launch, the Trans Mars Injection (TMI) Manoeuvre on December 1, 2013 gave necessary thrust to the spacecraft to escape from Earth and to initiate the journey towards Mars, in a helio-centric orbit. This journey, of course, is long wherein the spacecraft has to travel 680 million km out of which a travel of 190 million km is completed so far.
 
The First Trajectory Correction Manoeuvre (TCM) was conducted on December 11, 2013. The trajectory of the spacecraft, till today, is as expected. Three more TCM operations are planned around April 2014, August 2014 and September 2014, said Isro.
 
The health of the spacecraft is normal. It is continuously monitored by the ground station of ISRO Telemetry, Tracking and Command Network (ISTRAC), located at Byalalu, near Bangalore. Except for a 40 minute break in the telemetry data received from the spacecraft to the ground station, data has been continuously available for all the 100 days.
 
The propulsion system of the spacecraft is configured for TCMs and the Mars Orbit Insertion (MOI) Operation. On February 6, 2014, all the five payloads on Mars Orbiter spacecraft were switched 'ON' to check their health.
 
The health parameters of all the payloads are normal. At present, the spacecraft is at a radio distance of 16 million km causing a one way communication delay of approximately 55 seconds. After travelling the remaining distance of about 490 million km over the next 210 days, the spacecraft would be ins erted in to the Martian Orbit on September 24, 2014.
 
The main objective of India's launch is to check whether Mars ever had an environment in which life evolved and to explore Mars' surface, topography, minerology and atmosphere.
 
India's MOM, besides technological objectives, also has ambitious science goals as well, including a search for methane, the gas should last about 200 years on Mars. On Earth, the chemical is strongly tied to life and a Reuters report stated that Methane, which also can be produced by non-biological processes, was first detected in the Martian atmosphere a decade ago.
 
The Mars orbiter will be the first Isro's first spacecraft to exit the sphere of the Earth's influence, to the tune of around 925,000km, and enter a heliocentric cruise phase wh ere the gravitational tugs of the Sun and the other planets will dominate. The 10-month journey will be crucial and challenging and reports noted that less than half the around 50 spacecraft sent by other countries towards Mars have been able to completed it.
 
The Rs 450 crore mission, the lowest in the history of Mars Mission in the World, was actually initiated in 2010 and it includes Rs 110 crore for building PSLV-C25 that would launch the Rs 150 crore spacecraft, while the balance spent on augmenting ground facilities, including those required for deep space communication.
 
Only a third of all the missions to the red planet have tasted success. Locking horns with this red dot in the skies is excruciatingly challenging in terms of the technological mettle required in the domains of Navigation, propulsion System design, deep space communication systems, ground segment and thermal and radiation management.

[che wi]

и по-русски

Индийский орбитальный зонд Марса отметил первые 100 дней в космосе
http://www.astronews.ru/cgi-bin/mng.cgi?page=news&news=5468

Индийский космический аппарат, который будет исследовать Марс – Mars Orbiter Mission или, сокращенно, MOM, провел в космосе более 100 дней.

После космического путешествия в течение десяти с половиной месяцев зонд MOM, вес которого 1350 килограммов, прибудет в место назначения 24 сентября 2014 года. Там аппарат будет заниматься исследованием атмосферы и искать следы метана.

12 февраля 2014 года стало «сотым днем MOM» с момента запуска 5 ноября 2013 года с индийского космодрома Шрихарикота при помощи ракеты PSLV (Polar Satellite Launch Vehicle) также индийского производства, которая вывела зонд на начальную орбиту вокруг Земли.

Потребовалось провести шесть последовательных маневров по подъему орбиты. 1 декабря 2013 года был выполнен последний маневр, благодаря чему аппарат удалось вывести на гелиоцентрическую эллиптическую траекторию к Красной планете.

Первый из четырех маневров по коррекции траектории полета, TCM-1, был выполнен путем включения двигателей Newton на 40.5 секунд 11 декабря 2013 года. Еще три дополнительных маневра запланированы приблизительно на апрель 2014, август 2014 и сентябрь 2014.

Конструкция и строительство MOM обошлись Индийской Космической Исследовательской Организации ISRO в 69 миллионов долларов.

За первые 100 дней полета зонд пролетел около 190 миллионов километров. За следующие 205 дней он должен преодолеть чуть менее 500 миллионов километров.

Проверка состояния аппарата, проведенная 6 февраля 2014 года подтвердила, что все пять научных приборов космического аппарата включены и функционируют нормально.

В настоящее время MOM находится на расстоянии 16 миллионов километров от Земли. Радио сигналы от зонда до нас доходят примерно за 55 секунд.

[che wi]

Indian Mars Orbiter in excellent Health - Course Correction skipped
http://www.spaceflight101.com/mars-orbiter-mission-updates.html

India's Mars Orbiter is reaching the halfway-mark of its journey from Earth to Mars and the spacecraft is right on track, allowing it to skip a scheduled Trajectory Correction Maneuver on Wednesday. Carrying on its flight to Mars in excellent health, the MOM spacecraft is set for its Mars Orbit Insertion maneuver on September 24, 2014.

Over the past two months, MOM enjoyed a quiet cruise as it made its way through the inner solar system. The spacecraft was in constant contact with ground stations on Earth and the mission team has been reviewing all telemetry data received from the vehicle. Periodically, MOM activated its five instruments for regular check ups to ensure all instruments remain functional throughout the cruise to Mars.

Keeping in touch with the spacecraft via the Indian Deep Space Network Stations and NASA's Deep Space Network, trajectory specialists used Delta DOR (Delta differential one-way ranging) measurements to precisely determine MOM's trajectory. The first Trajectory Correction Maneuver of the mission performed on December 11, 2013 achieved its goal of fine-tuning the vehicle's trajectory and correcting errors that occurred during Trans-Martian Insertion.

The TCM was very accurate and placed MOM on a precise trajectory verified through tracking from Earth. With MOM on its deigned trajectory, mission planners decided to skip the next TCM that would have occurred on Wednesday. The next Trajectory Correction Maneuver is now planned for June to set up the proper conditions for Mars Orbit Insertion in September.

On Wednesday at 4:20 UTC, the Mars Orbiter will hit the half-way point, having traveled 337.5 Kilometers on its journey from Earth to Mars. As of 16:00 UTC on Tuesday, the MOM spacecraft was 38.3 million Kilometers from Earth traveling at a relative speed of 30,820 Kilometers per hour. The one-way signal travel time was 2 minutes and 8 seconds. The spacecraft was 63.81 million Kilometers from Mars moving at a relative speed of 35,830 Kilometers per hour. Relative to the sun, MOM was traveling at 96,270 Kilometers per hour at a distance of 182.5 million Kilometers. Also heading to Mars, NASA's MAVEN spacecraft was 4.5 million Kilometers from India's Mars Orbiter.

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Mars Orbiter Spacecraft Crosses Half Way Mark of its Journey
April 09, 2014

Today (April 09, 2014) at 9:50 am IST, India's Mars Orbiter Spacecraft crossed the half-way mark of its journey to the Red Planet along the designated helio-centric trajectory.

Mars Orbiter Spacecraft was launched onboard PSLV-C25 on November 05, 2013. On December 01, 2013, Trans Mars Injection manoeuvre was conducted successfully and the Spacecraft was set in its course towards Planet Mars through a helio-centric trajectory. Soon after the Spacecraft crossed the sphere of influence of Earth, a Trajectory Correction Manoeuvre (TCM) was performed successfully on December 11, 2013.

ISRO has been continuously monitoring the Spacecraft using its Deep Space Network complemented by that of NASA-JPL. As the Spacecraft is on its designated trajectory, the TCM planned for April 2014 is not considered essential. If required, the next TCM is planned to be carried out in June 2014.

Mars Orbiter Spacecraft and its five scientific instruments are in good health. Periodic tests are being done on the different levels of autonomy built into the Spacecraft for managing contingencies.

At present, the radio distance between the Spacecraft and the Earth is 39 million km. A signal from the Earth to the Spacecraft and back to Earth takes 4 minutes and 15 seconds. Soon, the High Gain Antenna of the Spacecraft will be put in service for handling communications with the ground stations.

The Mars Orbit Insertion (MOI) manoeuvre would be performed on September 24, 2014.

http://www.isro.gov.in/pressrelease/scripts/pressreleasein.aspx?Apr09_2014

[che wi]

A missive from MOM confirms the TCM2-Firing completion as planned. Team MOM is busy crunching numbers to determine the post-TCM2 trajectory.

https://twitter.com/ISROOFFICIAL/status/476685989578960897

[Quoondo]

Не очень понимаю. Там 25 кг всего. Это они без посадочного модуля значит летят?

[che wi]

Mars Orbiter Mission's second Trajectory Correction Manoeuver completed successfully.  Keep Cruising MOM !

https://twitter.com/ISROOFFICIAL/status/476742032057069568

Quoondo пишет:

Не очень понимаю. Там 25 кг всего. Это они без посадочного модуля значит летят?

MOM – Mars Orbiter Mission (т.е. орбитальный КА, без посадочного модуля).

[Salo]

che wi пишет:

A missive from MOM confirms the TCM2-Firing completion as planned. Team MOM is busy crunching numbers to determine the post-TCM2 trajectory.

https://twitter.com/ISROOFFICIAL/status/476685989578960897

http://www.isro.org/mars/updates.aspx

The second Trajectory Correction Manoeuvre (TCM-2) of India's Mars Orbiter Spacecraft was successfully performed on June 11, 2014 at 1630 hrs IST. TCM-2 was performed by firing the spacecraft's 22 Newton thrusters for a duration of 16 seconds.

At present, the radio distance between the Spacecraft and the Earth is 102 million km. A radio signal from the Earth to the Spacecraft now takes about 340 seconds. The spacecraft so far has traveled a distance of 466 million km as part of its total Journey of 680 million km.

ISRO is continuously monitoring Mars Orbiter Spacecraft using Indian Deep Space Network (IDSN). The spacecraft and its five scientific instruments are in good health.

[che wi]

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ISRO's Mars Orbiter completes 80% of journey



A view of Mars Orbiter spacecraft control room during Trans Mars Injection Operation

CHENNAI, JULY 22: Inching closer to the red planet, India's ambitious Mars Orbiter spacecraft has covered more than 540 million kilometres, about 80 per cent of its journey for its rendezvous with the planet scheduled for September 24.

The spacecraft has covered a distance of more than 540 million kilometres on its heliocentric journey to the red planet, ISRO said today.

"Yes, that is very close to a whopping 80 per cent". Mars Orbiter Mission and its payloads are in good health", ISRO said on its social networking site.

In the last crucial milestone, ISRO performed the second Trajectory Correction Manoeuvre on the spacecraft on June 11 by firing the spacecraft's 22 Newton thrusters for 16 seconds.

Mid-course corrections are done to keep the spacecraft on course.

Another trajectory correction manoeuvre is planned for August before ISRO performs the Mars Orbit Insertion in September.

The ambitious Mars mission under a 450 crore project was launched from Sriharikota in Andhra Pradesh onboard the Polar Satellite Launch Vehicle on November 5 last year with an aim to reach the red planet's atmosphere by September 24.

The project is expected to provide the scientific community better opportunities in planetary research.

(This article was published on July 22, 2014)

http://www.thehindubusinessline.com/news/science/isros-mars-orbiter-completes-80-of-journey/article6236830.ece

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60 дней до Марса!

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In final lap, ISRO's Mars spacecraft to burn 240 kgs-fuel to slowdown, enter Martian orbit

Avinash Nair | Ahmedabad | Published: Aug 02 2014, 18:41 IST

In it's final lap, India's Mars Orbiter spacecraft will burn a bulk of the 290 kilograms of fuel left in its fuel-tanks, when it slows down and performs a crucial manoeuvre to enter the Martian orbit next month, ISRO officials said here today. Once placed in the orbit, the spacecraft is scheduled to scan and study the atmosphere of red-planet for a period of six months.
"It is currently about 163 million kilometers away from Mars. It is travelling at a speed of 1.2 million kilometers per day. It is on schedule and on target. Originally we were planning to have a corrective manoeuvre on August 19. But in the current situation, we don't think it is necessary. So the next (trajectory) correction is scheduled for September 14 and on September 24, the orbiter is supposed to reach Mars and perform the manoeuvre to orbit the red planet," said A S Kiran Kumar, director Space Applications Centre, Indian Space Research Organisation (ISRO) while explaining the Mars Orbiter Mission (MOM) spacecraft will undergo a final trajectory correction on September 14, before it goes ahead and performs this crucial manoeuvre ten days later to enter the Martian orbit.
"We have 290 kilograms of fuel left, and we will require about 240 kilograms for the manoeuvre to enter the Mars orbit. The process will involve reducing the velocity of the spacecraft and allowing it to get captured by Mars' (gravity)," Kiran Kumar told The Indian Express at the sidelines of a conference on "Intellectual Property Rights in Electronics, IT and ICT organised by Confederation of Indian Industry (CII) and Government of Gujarat here on Saturday.
The veteran scientist who is a crucial part of the MOM said the orbiter will be slowed down by reducing its velocity by one kilometer per second roughly from it's current velocity.
"The liquid apogee motors that were used to push the spacecraft out of the earth's orbit, will be reoriented and fired, thus slowing down the spacecraft. It is a one time opportunity and has to be done precisely," Kiran Kumar said about the 440 Newton apogee motor on board the MOM spacecraft that will have to be restarted after 300 days since it was last fired during the Trans-Mars Injection phase.
ISRO officials point out that there is "no scope of error" during this nail-biting manoeuvre that will help tag India as the first Asian country to successfully reach Mars in it's maiden attempt.
"There is no scope for error," he said adding that all the commands will be fed in to the spacecraft three days in advance (before the manoeuvre on September 24) and the manoeuvre is expected to happen using the autonomous features of the spacecraft at 7:30 am on September 24. "In the previous activities, all the mechanisms and functionalities have got tested for this crucial manoeuvre," he added.
The MOM spacecraft that was launched on November 5, 2013, initially carried over 850 kilograms of fuel.

http://www.financialexpress.com/news/in-final-lap-isros-mars-spacecraft-to-burn-240-kgsfuel-to-slowdown-enter-martian-orbit/1275814/1

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50 земных суток.