Re: possible retrograde tumbler?

From: Mark Hammergren via Seesat-l <seesat-l_at_satobs.org>
Date: Wed, 10 Apr 2019 14:15:45 -0500
Thanks very much, Alain. Now that I think about it, I believe what I
saw was a double flare rather than a tumbler. When it caught my eye, I
thought it might be an Iridium flare a ways off track -- but then I
realized it was heading in the wrong direction.
Cheers,
Mark

On Wed, Apr 10, 2019 at 1:15 PM Alain Figer <alain.figer_at_gmail.com> wrote:
>
> Hi Mark,
>
> Maybe I found a possible candidate as 2012-014A, USA 234, FIA Radar 2,  inclination= 123°
> although I did not know it as a short periodic tumbler.
>
> Here is an excerpt from Calsky database about it :
>
> Name:          USA 234 / FIA Radar 2
> Military Sat.: Topaz 2/NROL-25. Second US National
>                Reconnaissance Office (NRO) radar imaging
>                satellite of the series named Future Imagery
>                Architecture (FIA).
> Brightness:     4.0 mag (at 1000 km, 50% illuminated)
>                 3.5 mag (at perigee, full illumination)
>                Mean magnitude from visual observations
> RCS:           12m2 (Radar cross section)
> USSPACECOM Nr: 38109  Internat. Designator: 2012-014A
> Orbit:         1098 x 1109 km, 107.3min  Inclination: 123.0°
> Age Elements:  7.2 days (Orbit from amateur sources)
>
>
> Regards
> Alain Figer
> 44.57°N  6.68° E, 1850m a.s.l.
>
>
> Le mer. 10 avr. 2019 à 19:32, Mark Hammergren via Seesat-l <seesat-l_at_satobs.org> a écrit :
>>
>> My apologies if this is not the place to pose this question.
>> I observed what appeared to be a fairly bright satellite travelling
>> towards the western horizon at a slight N-S angle (i.e., mostly
>> vertically going down E to W), with regular, smooth brightness
>> variations with roughly a ten second peak-to-peak period (as my memory
>> serves).
>> This was roughly at 0019 UT on 4/9, from Evanston Illinois (42.04 N,
>> 87.68W), at a rough initial azimuth of 265 degrees and elevation of
>> about 20 degrees.
>> There were several jets passing through the same area of the sky, and
>> they all displayed extended contrails with no specular brightness
>> variations.
>> Does anyone know of any candidates for what this might have been?
>> Thanks in advance.
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Received on Wed Apr 10 2019 - 14:16:42 UTC

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