Re: Brightness variation of NROL-101 Centaur

From: Alain Figer via Seesat-l <seesat-l_at_satobs.org>
Date: Mon, 30 Nov 2020 11:07:21 +0100
Hello Marco,

Here is the result of my photographic observations performed on 23 NOV 2020
:
photometric period = 138.39s +/- 0.33s .

In fact, from a russian source (mmt9.ru),  the rocket photometric period
appears to be quickly decreasing.
What may nicely explain the difference between both your results on the
nights of 20-21 and 22-23 NOV.

More info at :
https://www.flickr.com/groups/1983844_at_N22/discuss/72157714407081322/72157717098337312

Regards
Alain
48.67° N ;  2.13° E ; 170m a.s.l.





Le mar. 24 nov. 2020 à 17:08, Marco Langbroek via Seesat-l <
seesat-l_at_satobs.org> a écrit :

> Op 21-11-2020 om 18:29 schreef Marco Langbroek via Seesat-l:
>
> > After analysis of my imagery, I get a period of ~140 seconds (=2m 20s)
> from data
> > between 03:36:00 - 03:43:08 UT.
>
>
> Based on video observations in the night of Nov 22/23, I can now offer a
> slightly more precise value of (nominally) 138.02 seconds peak-to-peak.
>
> This is based on a 23-minute near continuous set of video data between
> 23:36 and
> 23:59 UT (Nov 22), covering 10 brightness peaks, taken with a WATEC 902H2
> Supreme and Samyang 1.4/85 mm lens.
>
> Curve:
>
>
> https://sattrackcam.blogspot.com/2020/11/brightness-variation-of-nrol-101.html
>
> The brightness varied semi-regularly between mag +6.0 and +8.5. Given the
> range
> and phase angles, this corresponds to an absolute magnitude between +2.0
> and +4.5.
>
> - Marco
>
>
> -----
> Dr Marco Langbroek  -  SatTrackCam Leiden, the Netherlands.
> e-mail: sattrackcam_at_langbroek.org
>
> Station (b)log: http://sattrackcam.blogspot.com
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> Twitter: _at_Marco_Langbroek
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Received on Mon Nov 30 2020 - 04:08:26 UTC

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