Author Topic: LIVE: Zenit-3F/Fregat-SB - Angosat-1 - December 26, 2017 (19:00 UTC)  (Read 78072 times)

Offline zubenelgenubi

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I suppose RSC Energia paying for the use of a Western Hemisphere tracking station to continue attempting communication with the satellite is out of the question?
***

Doesn't this uncontrolled drift in the Clarke belt make Angosat a potential hazard to the other geosynchronous satellites?  (For that matter, isn't the same true for this launch's Fregat upper stage?)
***

How do the Angolans, or at least the Angolan authorities, feel about paying for a failed satellite?
« Last Edit: 01/15/2018 08:08 pm by zubenelgenubi »
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Offline eeergo

Doesn't this uncontrolled drift in the Clarke belt make Angosat a potential hazard to the other geosynchronous satellites?  (For that matter, isn't the same true for this launch's Fregat upper stage?)

Not for now: it is 177-329 km above any operational GEO sat: http://spaceflight101.com/angosat-troubleshooting-to-resume-in-april/ Fregat moved to a graveyard orbit but has a perigee entering the GEO protected zone (although not approaching any operational sats for now).

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How do the Angolans, or at least the Angolan authorities, feel about paying for a failed satellite?

It's insured, but let's see what happens in 3 months.
-DaviD-

Offline eeergo

So they will try to revive the spacecraft after ~90 days with no telemetry and no command capability? No one in their right mind would voluntarily do that. It is just too embarrassing for Energia to admit that a spacecraft designed to work for 15 years only lasted 15 minutes. By April they hope everyone will have forgotten about it.

They are quoted as having isolated the problem and developed a testing campaign to try to fully recover it. Whether that's true or just a ruse to prolong the status-quo and reduce the falldown, I don't know - but it makes sense to wait out instead of rushing in the week that's left before it leaves ground station coverage with a quick untried procedure that may worsen the state of affairs (deeper failure, attitude control loss, or even an orbital change that brings it into the operational belt).
-DaviD-

Offline Arch Admiral

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I suppose RSC Energia paying for the use of a Western Hemisphere tracking station to continue attempting communication with the satellite is out of the question?
***

Angosat-1 is part of a recent trend for Russian design bureaus to use their own tracking stations on their own property. This started at NPO PM in Krasnoyarsk, but Energia now has two tracking dishes at the NW corner of their plant. This probably means that even other Russian stations (like the old NIP network run by the Rocket Force) can't communicate with this spacecraft.

Why would another comsat operator or builder help a cut-rate competitor recover from an embarrassing fiasco?? 

Offline Mapperuo

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Why would another comsat operator or builder help a cut-rate competitor recover from an embarrassing fiasco??

I guess this depends on if it’s threatening other satellites by circling the geo belt and if other sats need to move out it’s way.
« Last Edit: 01/16/2018 07:36 am by Mapperuo »
- Aaron

Offline input~2

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In mid-April the satellite will be back in the coverage zone of Korolev control center and the eclipse season will be over, which will help for testing the power supply subsystem

Online Alter Sachse

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In mid-April the satellite will be back in the coverage zone of Korolev control center and the eclipse season will be over, which will help for testing the power supply subsystem
If he still has enough electrical power.
One day you're a hero  next day you're a clown  there's nothing that is in between
        Jeff Lynne - "21century man"

Offline zubenelgenubi

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Why would another comsat operator or builder help a cut-rate competitor recover from an embarrassing fiasco??

Three possible reasons:
One
Airbus Defence and Space provided the payload on the Energia s/c bus, yes?  Airbus has an interest in ensuring their payload operates, even if they've already been paid.

Two
$$$--fees for use of facilities, etc.

Three
A favor as an antifreeze in increasingly frosty relations?
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Offline russianhalo117

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Why would another comsat operator or builder help a cut-rate competitor recover from an embarrassing fiasco??

Three possible reasons:
One
Airbus Defence and Space provided the payload on the Energia s/c bus, yes?  Airbus has an interest in ensuring their payload operates, even if they've already been paid.

Two
$$$--fees for use of facilities, etc.

Three
A favor as an antifreeze in increasingly frosty relations?
to clarify Airbus DS is responsible in full only for the broadcast payload. Command and Control hardware is a hybrid solution involving both Russian and European hardware and software.

Offline zubenelgenubi

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Why would another comsat operator or builder help a cut-rate competitor recover from an embarrassing fiasco??

Three possible reasons:
One
Airbus Defence and Space provided the payload on the Energia s/c bus, yes?  Airbus has an interest in ensuring their payload operates, even if they've already been paid.

Two
$$$--fees for use of facilities, etc.

Three
A favor as an antifreeze in increasingly frosty relations?
to clarify Airbus DS is responsible in full only for the broadcast payload. Command and Control hardware is a hybrid solution involving both Russian and European hardware and software.

Aha!

And that interface, by inference from the news quoted up-thread, would be where the hardware or software incompatibilities would lie?
Support your local planetarium! (COVID-panic and forward: Now more than ever.) My current avatar is saying "i wants to go uppies!" Yes, there are God-given rights. Do you wish to gainsay the Declaration of Independence?

Offline russianhalo117

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Why would another comsat operator or builder help a cut-rate competitor recover from an embarrassing fiasco??

Three possible reasons:
One
Airbus Defence and Space provided the payload on the Energia s/c bus, yes?  Airbus has an interest in ensuring their payload operates, even if they've already been paid.

Two
$$$--fees for use of facilities, etc.

Three
A favor as an antifreeze in increasingly frosty relations?
to clarify Airbus DS is responsible in full only for the broadcast payload. Command and Control hardware is a hybrid solution involving both Russian and European hardware and software.

Aha!

And that interface, by inference from the news quoted up-thread, would be where the hardware or software incompatibilities would lie?
yes because the broadcast payload has not been activated rather only the antennas have been deployed by automatic timer sequence to make the Spacecraft 3D stabilized.

Known contractors in the Angosat project:
RKK Energia/ZAO ZEM - Prime contractor and system integrator
Airbus Defense and Space - Transponder payload
AO NII Argon
FGUP NII of Command Instruments - Reaction wheels for the flight control system
AO AVEKS - Power supply system
PAO Saturn - SCCS Command and Control
ZAO TsSKT
OOO NPO Rubikon-Innovatsiya
AO NPP Geophysika-Kosmos
OOO NPP TAIS
OOO S7 Space Systems
FGUP TsNIIMash

Angosat-1 frequencies:
Beacon frequencies:
C-band - 3830 MHz
Ku-band - 10951 MHz

SCCS frequency:
Command receivers - 5741.525 and 5745.495 MHz
Telemetric transmitters - 3401.125 and 3404.125 MHz

EIRP of SCCS:
0 dBW (omnidirect. mode)
4.3 dBW (via PL antennas)
« Last Edit: 03/22/2018 02:14 pm by russianhalo117 »

Offline PIN

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I suppose RSC Energia paying for the use of a Western Hemisphere tracking station to continue attempting communication with the satellite is out of the question?

1. They are not used to do so. I doubt they even considered changing the habits/policy this time
2. Who wants bad news before the upcoming elections in March?
3. Eclipse season is soon anyway.

The s/c is put into safe mode and hopefully comes back still powered.

Offline FutureSpaceTourist

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Quote
(1/2) Video footage of what almost certainly was the re-entry of a Russian FREGAT upper stage from the launch of ANGOSAT. It reentered around 23:32 GMT on 27 January on the Peru-Brasil border. (with HT to @Cosmic_Penguin for alerting me to this post).

https://twitter.com/GABRlELPlNHElRO/status/957707032278261761

https://twitter.com/Marco_Langbroek/status/957986253064015873

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(2/2) map of the re-entry position:

https://twitter.com/Marco_Langbroek/status/957986254729236485

Edit to add:

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(3/3) forgot to include the Object ID, it is SSC #43087, COSPAR 2017-086A. This is a Fregat upper stage from a Russian Zenit rocket that launched Angosat a month ago, on 26 December, from Baikonur.

https://twitter.com/Marco_Langbroek/status/957987032776704000
« Last Edit: 01/29/2018 01:56 pm by FutureSpaceTourist »

Offline eeergo

The January 27 reentered object is probably the Zenit second stage (ID 43090).  The second stage boosted the vehicle to a parking orbit on this mission.  The Fregat drop tank and other launch vehicle "debris" parts may soon reenter, but the Fregat stage itself ended up in near-geosynchronous orbit.

 - Ed Kyle

Some images of recovered re-entered parts shown by Peru's Space Agency: http://www.abc.es/ciencia/abci-misteriosas-esferas-metal-caidas-cielo-peru-201802281033_noticia.html
-DaviD-

Offline input~2

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"Lost by Roscosmos, the satellite came to life in orbit"
https://www.pravda.ru/news/science/21-03-2018/1376610-space-0/

A test was recently carried out on the propulsion subsystem

Another source
« Last Edit: 03/21/2018 04:47 pm by input~2 »

Offline Steven Pietrobon

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Bing translation:

"It is reported that currently Angosat-1 is outside the visibility of the management stations in Russia and Angola. It will enter the area of visibility in early April."

"Specialists are currently trying to connect with the satellite. According to the source of the agency, the communication could be interrupted due to the failure of the transmitter, the digital computer machine or the malfunction of the batteries."
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Arch Admiral

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These reports are contradictory: if the satellite is still below the horizons of the control stations in Moscow and Luanda, how could there have been a test of the propulsion system? Maybe a tracking station in the east of Siberia was modified for this function?

Offline harry2680

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News article states:
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Russian top diplomat Serguey Lavrov Monday in Luanda said the Angolan Angosat satellite, produced and launched into space by a company from his country, remains in orbit and is scheduled to start operating next April.
...
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He  stressed that the satellite will start operating in April.

The statement seems to support the idea they have run tests on the satellite to give them hope it can be recovered.
« Last Edit: 04/12/2018 10:24 am by harry2680 »

Offline harry2680

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More recent news article:

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"The spacecraft" Angosat-1 "entered the radiovisibility zone from the Moscow region near Korolev, but specialists can not be connected with it,"

However

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Roskosmos claims that it is premature to give an assessment of the working capacity of the spacecraft.
...
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The algorithms for ground-based equipment will be finalized and the program will start working on the device within the next few days .These operations require time until May 2018,

It looks like we'll have to wait till the end of May for official confirmation, however I think it's likely the satellite will not be recovered.

Offline input~2

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Yep, no success after further trials..

http://tass.ru/kosmos/5128130

Quote
After repeated attempts to establish a full-fledged communication and take over the Angolan satellite for management, which were resumed in April, experts came to the conclusion that the apparatus is inoperative

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