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 Post subject: Possible re-entry
PostPosted: Fri May 19, 2017 2:41 pm 
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Location: 55° 57'N: 03° 08'W
Possible re-entry visible on Saturday May 20 at around 22:50 U.T.
After nearly 42 years in orbit, 75-72B, Cos B rocket, #8063 will
be passing north-south over U.K. So it's worthwhile spending a
few minutes at about that time in case it's in the process of decaying.


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 Post subject: Re: Possible re-entry
PostPosted: Sun May 21, 2017 9:53 am 
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Joined: Fri Dec 03, 2004 11:24 am
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Location: Greenwich, London
Were there any reports on this or was there nothing to see in the end?

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 Post subject: Re: Possible re-entry
PostPosted: Sun May 21, 2017 12:31 pm 
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Location: 55° 57'N: 03° 08'W
Due to an increase in atmospheric density, caused by heating by solar radiation,
this object decayed around 5 hours earlier than predicted.
Therefore well away from the U.K. Have not seen any reports from elsewhere
in the world.


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 Post subject: Re: Possible re-entry
PostPosted: Mon May 22, 2017 9:30 am 
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Location: Greenwich, London
Ok, thanks for the update.

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 Post subject: Re: Possible re-entry
PostPosted: Mon May 22, 2017 10:31 am 
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Joined: Mon Jan 09, 2006 11:05 am
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Location: Lancashire
Was this vintage satellite of military or civilian type? The "Cos" in its designation might indicate that it was a soviet-era Cosmos military satellite. If so, there might have been a uranium power source onboard, similar to the Cosmos satellite that disintegrated over Canada years ago.

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 Post subject: Re: Possible re-entry
PostPosted: Mon May 22, 2017 1:18 pm 
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Joined: Fri Dec 03, 2004 2:41 pm
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Location: 55° 57'N: 03° 08'W
No, the "Cos" refers to Cosmic ray studies.
COS-B was the first European Space Research Organisation mission to study cosmic gamma ray sources. COS-B was first put forward by the European scientific community in the mid-1960s and approved by the ESRO council in 1969.
The satellite succumbed to lunar gravitation effects back in the 1980s, but
the Delta 1 rocket (American) had now reached the end of its lifetime.
The rocket's polar orbit proved useful in determining the strength of
winds in the upper atmosphere at heights around 300 kilometres.
Incidentally, although 75-72B was not seen at the time of its decay,
there were several videos of the decay of 17-21B, the rocket of the
Chinese supply spacecraft which docked with the Tiangong space station.
For example:
https://youtu.be/TZgzKjux29Y


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