Re: 81-33b 12389 final orbit observation ?

From: Tristan Cools via Seesat-l <seesat-l_at_satobs.org>
Date: Sun, 12 Jul 2015 09:33:23 +0200
Thanks Ted,

Observation was indeed from Bruges, Belgium.  With a slight reddish/orange
color, thinking that a glowing experience could be sighted was only
wishfull thinking.  However I only had a small visibility window with a
neighbouring house blocking part of my view, it was a very spectacular
pass.  Unfortunately my camera refused to work at the time of transit.  Its
the law of Murphy...

It would be nice to know when re-entry did take place(around the predicted
time of 22:10 UTC)  ?

Greetings,
Tristan Cools

2015-07-12 6:04 GMT+02:00 Ted Molczan via Seesat-l <seesat-l_at_satobs.org>:

> Tristan Cools wrote:
>
> > Maybe i observed what could be the final orbit of this Cosmos 1263
> rocket.
> > At 21:12 utc just passing below bootes mag 0.  Orange color maybe already
> > glowing....   greetings tristan cools
>
> Assuming that you observed from Bruges, then mag 0 when passing near
> Bootes was within the range of the predicted
> magnitude of 2.0 +/-2. This is based on standard magnitude 5.3 (1000 km,
> 90 deg phase angle) and coefficient of phase
> 1.23 mag/rad. These were derived in 2001, from 952 visual observations by
> Russell Eberst of this model of rocket stage.
> Based on the TLE nearest in epoch, the altitude at the time was 140 km -
> too high to have been self-luminous.
>
> Alain Figer observed at about the same time and reported mag 0 or 0.5,
> consistent with the predicted maximum brightness
> from his location of mag 0.8 +/-2.
>
> Ted Molczan
>
>
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Received on Sun Jul 12 2015 - 02:34:12 UTC

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