Author Topic: LIVE: Zenit-3F/Fregat-SB - Angosat-1 - December 26, 2017 (19:00 UTC)  (Read 78055 times)

Offline input~2

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After communication with AngoSat-1 satellite, created in Russia for Angola, was interrupted, experts of both countries are trying to establish the causes of the accident.

About this "Izvestia" was told by RSC Energia.

"A commission was created to investigate and parry an abnormal situation that arose on December 27 when the AngoSat-1 spacecraft was launched. This is a joint commission of RSC Energia and the Angolan side, "the corporation said.

So far, there is hope of restoring communication, as the satellite has deployed solar panels and can receive energy.

Recall that the connection with the satellite was interrupted at the 42nd minute, after the launch on December 26 from the Baikonur cosmodrome.
https://iz.ru/689223/2017-12-28/eksperty-angoly-i-rossii-ustanavlivaiut-prichiny-poteri-sputnika-angosat-1

Offline Artyom.

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Good news!!! http://tass.ru/kosmos/4850396

Google translator
Quote
Specialists managed to establish a connection with the Angolan satellite "Angosat", which was launched on December 26 from the Baikonur cosmodrome, telemetry was received from the apparatus.

Offline russianhalo117

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Good news!!! http://tass.ru/kosmos/4850396

Google translator
Quote
Specialists managed to establish a connection with the Angolan satellite "Angosat", which was launched on December 26 from the Baikonur cosmodrome, telemetry was received from the apparatus.

http://russianspaceweb.com/zenit-angosat-launch.html#problem
Quote
Communications restored!

During most of the day on December 28, the efforts to contact Angosat-1 continued and in the evening Moscow Time, the official TASS news agency reported that flight controllers had receieved telemetry from the spacecraft. This fact was also confirmed by the Angolan government.

Sequence of Angosat-1 activation after the separation from Fregat:

1. Separation contact - 30 seconds;
2. Establishment of TCR radio link - 4.5 minutes;
3. Unpinning ARDM - 30 seconds;
4. Damping of residual angular rate - 10 minutes;
5. Establishment of sun inertial attitude - 15 minutes;
6. Unpinning and deployment SA - 3.5 minutes;
7. Restoration of sun inertial attitude - 5 minutes;
8. SB charge tests of SED26MK2, CMWA, SADM - 10 hours;
9. Unpinning and deployment C-band and Ku-band reflectors - 5-15 hours.

Offline input~2

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connection with Angosat could have disappeared due to discharged batteries
http://tass.ru/kosmos/4850561
« Last Edit: 12/28/2017 07:44 pm by input~2 »

Online zubenelgenubi

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connection with Angosat could have disappeared due to discharged batteries
http://tass.ru/kosmos/4850561

Even if the satellite and mission are snatched from the jaws of defeat, discharged batteries are very worrisome.
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Offline A12

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connection with Angosat could have disappeared due to discharged batteries
http://tass.ru/kosmos/4850561

So, what could be happened is that, before the solar panels became effective, the batteries discharged, hence the loss of telemetry?

Online zubenelgenubi

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Experts, please correct my deduction if I am wrong.

Quote
connection with Angosat could have disappeared due to discharged batteries
http://tass.ru/kosmos/4850561

So, what could be happened is that, before the solar panels became effective, the batteries discharged, hence the loss of telemetry?

Yes, the batteries should not discharge before the solar panels begin generating effective power.  It appears that this progression failed in this instance.

Quote
The satellite successfully navigated in space, opened solar panels and antennas, began transmitting telemetric information to Earth. Communication with the spacecraft lasted 42 minutes, after which it suddenly broke off.

- Experts are trying to restore the device. Our employees study the previously received telemetric information, make attempts to get in touch, - RSC Energia told Izvestia .

The battery charge on the satellite should be enough for 10-16 hours of uninterrupted operation after separation from Fregat  (5:54 Moscow time on December 27). But RSC Energia is sure that the opportunity to establish communication will continue after this period, as the solar panels managed to open up.
https://iz.ru/689073/dmitrii-strugovetc/k-rassledovaniiu-avarii-angosat-1-privlekut-angolskikh-spetcialistov
***

Thinking ahead:
I hope the batteries are not permanently failed--they'll need them when the Earth's shadow falls on the geosynchronous orbits for several days centered on the two equinox dates/year, and GEO satellites draw electricity from their batteries.
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Offline russianhalo117

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Experts, please correct my deduction if I am wrong.

Quote
connection with Angosat could have disappeared due to discharged batteries
http://tass.ru/kosmos/4850561

So, what could be happened is that, before the solar panels became effective, the batteries discharged, hence the loss of telemetry?

Yes, the batteries should not discharge before the solar panels begin generating effective power.  It appears that this progression failed in this instance.

Quote
The satellite successfully navigated in space, opened solar panels and antennas, began transmitting telemetric information to Earth. Communication with the spacecraft lasted 42 minutes, after which it suddenly broke off.

- Experts are trying to restore the device. Our employees study the previously received telemetric information, make attempts to get in touch, - RSC Energia told Izvestia .

The battery charge on the satellite should be enough for 10-16 hours of uninterrupted operation after separation from Fregat  (5:54 Moscow time on December 27). But RSC Energia is sure that the opportunity to establish communication will continue after this period, as the solar panels managed to open up.
https://iz.ru/689073/dmitrii-strugovetc/k-rassledovaniiu-avarii-angosat-1-privlekut-angolskikh-spetcialistov
***

Thinking ahead:
I hope the batteries are not permanently failed--they'll need them when the Earth's shadow falls on the geosynchronous orbits for several days centered on the two equinox dates/year, and GEO satellites draw electricity from their batteries.
no the SC batteries are powering the spacecraft from before the moment of liftoff to end of life of the spacecraft. The batteries may have run low on charge to the point that safe mode was triggered thus comm was not possible. All information states the spacecraft is nominally functioning at this time and their in no longer a problem. The problem is that all of these news sites are publishing many hours old information after seeing it on State media.

Offline AntiAnti

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According to the official statement, all on-board systems are doing nominally now. So what was it?

https://www.energia.ru/ru/news/news-2017/news_12-28.html

Offline Zed_Noir

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My WAG. The SC batteries wasn't fully charged and ran out of juice before the solar arrays deployed.  :)

Offline A12

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from http://www.russianspaceweb.com/zenit-angosat-launch.html

Quote
TASS quoted industry sources as saying that the communications could had initially been disrupted due to draining of the spacecraft's batteries, but, fortunately, Angosat-1 had already deployed its solar panels, which allowed to restore the power supply.

Bold mine.

Offline input~2

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from Interfax dated today at 05:25 UTC:
Quote
RSC Energia was informed of the restoration of communication with the Angolan satellite
The information received from the satellite shows that all the parameters of the vehicle's on-board systems are normal
http://www.interfax.ru/russia/593930

and from RIA dated today at 05:09 UTC
Quote
RSC Energia was informed of the restoration of communication with the Angolan satellite
https://ria.ru/space/20171229/1511939501.html
« Last Edit: 12/29/2017 08:04 am by input~2 »

Offline input~2

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connection with Angosat could have disappeared due to discharged batteries
http://tass.ru/kosmos/4850561
I should have expanded the above quote, dated December 28, 15:49 UTC:
"According to preliminary data, connection with Angosat disappeared due to discharged batteries, but at that time the satellite was already oriented to the Sun and had opened the solar panels, which gradually restored the charge in the electrical system of the device"


http://tass.ru/kosmos/4850561

Offline input~2

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Fri, 29 Dec 2017 09:20[LT] -
Angosat-1 re-establishes communication
Luanda - The Angolan satellite, Angosat-1, last Friday re-established communication with the earth station, hours after it lost contact following its launch into orbit last Tuesday evening, in Kazakhstan, in the ambit of a project developed by a Russian company.
The re-establishment of the communication with Angola’s first satellite was confirmed to ANGOP last Thursday, over the phone, by the secretary of State for Telecommunications and Information Technologies, Manuel Homem.
The launching of the Angosat-1 stimulated a wave of speculative comments in Angola and abroad, after it was announced that the earth station lost the communication signal with the satellite after it entered into orbit. 

http://m.portalangop.co.ao/angola/en_us/noticias/ciencia-e-tecnologia/2017/11/52/Angosat-establishes-communication,bb803cb0-e5f5-4ed9-a4bc-cb2094d97e67.html

Offline input~2

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Still no TLE for the satellite..

@JSpOC: try searching at this time around 51°East in an orbit not far from 35943 x 36033 km x 1°  ;)

Offline input~2

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and the news has been relayed by Roscosmos
Quote
RSC ENERGIA: ANGOSAT - COMMUNICATION RESTORED
12/29/2017 05:23 UTC
RSC Energia specialists received telemetry information from the spacecraft Angosat launched on December 26 by the Zenit-3SLBF space rocket from the Baikonur cosmodrome.
The satellite received telemetry information which shows that all the parameters of the on-board systems of the device are normal.

https://www.roscosmos.ru/24522/

Offline input~2

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Still no TLE for the satellite..

@JSpOC: try searching at this time around 51°East in an orbit not far from 35943 x 36033 km x 1°  ;)
OK! thanks to JSpOC we now have data for Angosat-1:

2017-086A/43087 in 35963 x 36116 km x 0.06°
at epoch Dec 29, 03:42 UTC satellite longitude: 50.1°E

Offline Star One

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What about occasions when the solar panels aren’t able to recharge the batteries, and if the batteries aren’t able to hold a charge? Or do they mean that it was a one off incident of being launched with flat or almost flat batteries?
« Last Edit: 12/29/2017 11:45 am by Star One »

Offline AntiAnti

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i'm not so sure about power supply system failture. According to quite reliable rumours, they was receiving some corrupted data from the spacecraft between official 'loss of signal' and 'connection restored' statements. According to not so reliable rumour, it was a software mishap.

Offline Star One

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i'm not so sure about power supply system failture. According to quite reliable rumours, they was receiving some corrupted data from the spacecraft between official 'loss of signal' and 'connection restored' statements. According to not so reliable rumour, it was a software mishap.

So there was possible never an issue with the batteries just the software.

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