Re: tumbling rocket and satellite

From: tristan.cools--- via Seesat-l <seesat-l_at_satobs.org>
Date: Sat, 20 Apr 2019 14:02:25 +0200
Thanks Alain, I will follow the discussion forums.  I knew about some other
Centaurs tumbling but to my knowledge it is rather rare but this is solely
based on my own observations.(my observations of Centaur rockets isn't that
large)  I have some trouble in finding updated PPAS records.  Are flash
periods still beeïng reported somewhere ?  During the last 10 years I did
some sporadic observations but didn't report anything anymore.

gr, tristan cools
Belgian Working Group Satellites

Op za 20 apr. 2019 om 11:36 schreef Alain Figer <alain.figer_at_gmail.com>:

>
> Hi Tristan,
>
> > Most Centaur rockets have always been steady (according to my own
> observations)
>
> I am somewhat surprised by such a statement, since it is not what I have
> been currently noticing.
> See for instance several threads in my blog at :
> https://www.flickr.com/groups/satellites_artificiels/
>
> More exhaustively, the russian site 'astroguard.ru' (MMT data) lists
> multiple examples of flashing Atlas Centaur rockets.
> Concerning 2007-060B their graph shows how the rotation period has been
> decreasing for the last years ;  their last measurement is at 48.72s for
> the rotation period (twice your photometric period).
>
> See also the info by the same russian site about Landsat 4 1982-072A.
> They measured a rotation period at 16.7 s in 2018 but observed the rocket
> as 'Aperiodic'  in other circumstances too.
>
> Regards
>
> Alain Figer
> Gometz: 48.67 N ; 2.13 E ; 170m a.s.l.
> Vars: 44.57 N ; 6.68 E ; 1850m a.s.l.
>
>
> Le sam. 20 avr. 2019 à 10:28, tristan.cools--- via Seesat-l <
> seesat-l_at_satobs.org> a écrit :
>
>> Hi all,
>>
>> Most Centaur rockets have always been steady(according to my own
>> observations) but I was surprised to see 07-60B/32379 as a nice regular
>> varying object with a period of about 23s.  I think I will follow this
>> object to see it's future flash behaviour.  Maybe this has already been
>> reported...
>>
>> Another object, is the Landsat 4 satellite(82-72A/13367), no exact period
>> measured but around 30s with sharp and round maxima.  In my old records I
>> had a notice written that this satellite did have a mechanism to be
>> retrieved by the Space Shuttle.  Well, it is too late for that, but only
>> one satellite I think has ever been retrieved and re-launched I remember.
>>
>> greetings,
>> Tristan Cools
>> Belgian Working Group Satellites.
>> _______________________________________________
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>> http://mailman.satobs.org/mailman/listinfo/seesat-l
>>
>
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Received on Sat Apr 20 2019 - 07:03:32 UTC

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