Re: tumbling rocket and satellite

From: Brad Young via Seesat-l <seesat-l_at_satobs.org>
Date: Sat, 20 Apr 2019 22:24:56 +0000 (UTC)
There are quite a few PPAS type reports of tumbling objects and other visually interesting satellites at:
http://www.satflare.com/fpas_query.asp
in a sortable database.
To stretch this thread a little bit, I stopped reporting to that site because it doesn’t seem to be updating any new observations. Would it be useful to resume making PPAS report in the old style? It doesn’t seem like the PPAS list of interesting objects has been updated for quite some time. I have a personal list that may be of some interest. If anyone has any ideas or if interested and follow up please contact me off the list. With the northern summer months, and, it will be a good time to revitalize optical behavior observing work.
Brad 

Sent from Yahoo Mail for iPhone


On Saturday, April 20, 2019, 7:02 AM, tristan.cools--- via Seesat-l <seesat-l_at_satobs.org> wrote:

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.
>> _______________________________________________
>> Seesat-l mailing list
>> http://mailman.satobs.org/mailman/listinfo/seesat-l
>>
>
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Received on Sat Apr 20 2019 - 17:40:09 UTC

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