Re: fast moving bright unid (2)

From: Marco Langbroek via Seesat-l <seesat-l_at_satobs.org>
Date: Mon, 08 Sep 2014 22:49:15 +0200
C. Bassa via Seesat-l schreef op 8-9-2014 20:53:

> Fitting an orbit to both Kevin and these observations gives:
> 1 28888U 05042A   14251.77652340  .00000000  00000-0  50000-4 0    04
> 2 28888  96.9174 289.4726 0129943   0.3928  51.8245 15.71831976    03
> # 20140908.01-20140908.78, 26 measurements, 0.014 deg rms


When combined with the last known orbit, this actually suggests a manoeuvre on 
or near 2014 July 1st ~1:40 UT (but take that accuracy with a grain of salt) 
when perigee was over the south pole. Apogee was lowered by almost 500 km.


> Alberto Rango last saw it in June when it appeared to have manouvred
> after having spent a few months in some sort of transfer orbit that
> was precessing its plane West

Alberto actually reported that he failed to see it early June (see his post of 
June 9th: http://www.satobs.org/seesat/Jun-2014/0069.html): but during low 
twilight passes, which might perhaps explain the non-observations.

Mike McC and another US observer positively observed it late May. So did it 
manoeuvre early June, or did we simply lose it in twilight of the N-hemisphere 
summer, after which it manoeuvered at July 1st?

Let's see however what results when the current orbit has been better 
established with a longer arc.

If USA 245 is still in it's last known plane, the RAAN difference between the 
two should now be about 25 degrees.

- Marco


-----
Dr Marco Langbroek  -  SatTrackCam Leiden, the Netherlands.
e-mail: sattrackcam_at_langbroek.org

Cospar 4353 (Leiden):   52.15412 N, 4.49081 E (WGS84), +0 m ASL
Cospar 4354 (De Wilck): 52.11685 N, 4.56016 E (WGS84), -2 m ASL
Cospar 4355 (Cronesteyn): 52.13878 N, 4.49937 E (WGS84), -2 m ASL
Station (b)log: http://sattrackcam.blogspot.com
Twitter: @Marco_Langbroek
PGP key: http://tinyurl.com/kur7xm8
-----
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Received on Mon Sep 08 2014 - 15:49:35 UTC

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