GSAT-6A - GSLV-F08 (Mk-II) - Шрихарикота - 29.03.2018, 11:26 UTC

[Liss]

Старый пишет:

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

Уууу! Так это ж взрыв при включении апогейного двиателя.

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 :-)

[Старый]

Liss 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 :-)

Когда спутник неожиданно пропадает в процессе перевода с ГПО на ГСО то взрыв двигателя - наиболее вероятная причина. Не обязательно самого двигателя, можно баллонов с газом наддува, остатков топлива в трубопроводах и т.п. Вобщем отказ ассоциируется с разрушением двигательной установки.  Отказ чегото другого, например электроники, крайне маловероятен.

[tnt22]

https://timesofindia.indiatimes.com/india/we-now-knows-exact-location-of-gsat-6a-communication-satellite-says-isro-chief/articleshow/63701803.cms

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

Surendra Singh| TNN | Updated: Apr 10, 2018, 22:47 IST

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

Talking to TOI, Isro chairman 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."

[tnt22]

https://www.hindustantimes.com/india-news/gsat-6a-located-hope-to-re-establish-communication-link-isro-chairman/story-JPBye4Y8IM9wGrR46fAUmO.html

GSAT-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 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. But we have located the satellite, we are hoping to re-establish the communication link.
...

https://energy.economictimes.indiatimes.com/news/renewable/power-system-failure-cost-isro-gsat-6a-vssc-chief/63829699

Power 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  |  TNN  |  April 19, 2018, 15:06 IST

THRISSUR: A failure in the power system could have led to the Indian Space Research Organization (Isro) losing contact with the recently launched GSAT-6A communication satellite, a senior official of the Vikram Sarabhai Space Centre(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 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. ...