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.
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.
Good news!!! http://tass.ru/kosmos/4850396Google translatorQuoteSpecialists 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.
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.
connection with Angosat could have disappeared due to discharged batteries
Quoteconnection with Angosat could have disappeared due to discharged batterieshttp://tass.ru/kosmos/4850561
Quote from: input~2 on 12/28/2017 07:38 pmQuoteconnection with Angosat could have disappeared due to discharged batterieshttp://tass.ru/kosmos/4850561So, what could be happened is that, before the solar panels became effective, the batteries discharged, hence the loss of telemetry?
QuoteThe 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
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.
Experts, please correct my deduction if I am wrong.Quote from: A12 on 12/28/2017 09:06 pmQuote from: input~2 on 12/28/2017 07:38 pmQuoteconnection with Angosat could have disappeared due to discharged batterieshttp://tass.ru/kosmos/4850561So, 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 from: input~2 on 12/28/2017 01:33 pmQuoteThe 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.
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.
RSC Energia was informed of the restoration of communication with the Angolan satelliteThe information received from the satellite shows that all the parameters of the vehicle's on-board systems are normal
RSC Energia was informed of the restoration of communication with the Angolan satellite
Fri, 29 Dec 2017 09:20[LT] - Angosat-1 re-establishes communicationLuanda - 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.
RSC ENERGIA: ANGOSAT - COMMUNICATION RESTORED12/29/2017 05:23 UTCRSC 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.
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°
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.