Re: CB Obs September 18, 2014: USA 186 seen!

From: Marco Langbroek via Seesat-l <seesat-l_at_satobs.org>
Date: Thu, 18 Sep 2014 23:53:03 +0200
C. Bassa via Seesat-l schreef op 18-9-2014 23:00:
> Here is a search elset fitting Marco and Leo's observations from
> September 17th and mine from this evening.
>
> USA 186
> 1 28888U 05042A   14261.83539752  .00000000  00000-0  50000-4 0    03
> 2 28888  96.7416 299.1054 0067896 336.2379  73.5322 15.66440444    08
> # 20140917.81-20140918.84, 11 measurements, 0.094 deg rms
>
> Further observations will help to make sure this orbit is correct.
>
> If the orbit is correct then it suggests a manouvre at apogee around
> 18:30UT on September 17th, raising the perigee from 260 km to 320 km.


Here is my attempt as to the new orbit, based on obs by Leo, Cees and me on Sep 
17 and Sep 18:

USA 186                                                     321 x 417
1 28888U 05042A   14261.82653136 0.00005447  00000-0  45817-4 0    05
2 28888  96.8506 299.2623 0071013 335.3201  24.4668 15.66435899    08

This suggest a manoeuvre on 17 Sep 17:46:15 UT in the ascending node over 
Africa, only 5-6 mins after passing perigee. Result of the manoeuvre is a more 
circular orbit with raised perigee and lowered apogee.

Of course, to really say something we need a better established orbit.

- 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 Thu Sep 18 2014 - 16:53:46 UTC

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