Re: LB Obs 2014 May 23-24

From: Marco Langbroek via Seesat-l <seesat-l_at_satobs.org>
Date: Sat, 24 May 2014 19:14:33 +0200
C. Bassa via Seesat-l schreef op 24-5-2014 17:21:
> Propagating the old elements forward and fitting the data allowing for
> changes in mean anomaly and RA of the ascending node yields this
> orbit:
> 1 26934U 01044A   14144.63398148  .00000000  00000-0  00000-0 0    02
> 2 26934  97.0335 276.7823 0001902 124.8490  48.3766 15.68826283    01
> # 20140524.04-20140524.04, 7 measurements, 0.091 deg rms
>
> Fitting a circular orbit instead yields a much better fit but with a
> lower mean motion:
> 1 26934U 01044A   14144.03928469  .00000000  00000-0  50000-4 0    00
> 2 26934  96.9795 276.4708 0000000   0.0000  56.9491 15.60921888    07
> # 20140524.04-20140524.04, 7 measurements, 0.006 deg rms
>
> It may be worthwhile to search for USA 161 using both orbits.


Here is my attempt at orbit fitting, using an eccentricity value more in line 
with what it was for USA 161 when we lost it in the winter blackout:


USA 161                                                  398 x 406 km
1 26934U 01044A   14143.98036073 0.00008981  00000-0  13402-3 0    04
2 26934  97.0000 276.7470 0005500 178.0565 269.4743 15.55047289    08

rms     0.06664

For tonight, this orbit will give a pass 13 minutes after Cees' first 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
-----
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Received on Sat May 24 2014 - 12:14:49 UTC

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