Re: Optical 14 March 2016 Part 1

From: C. Bassa via Seesat-l <seesat-l_at_satobs.org>
Date: Tue, 15 Mar 2016 14:31:50 +0100
Hi Greg,

Thanks for the observations.

Naively fitting a very high eccentricity elliptical orbit to the two
tracks yield the solutions below.

Here I have fixed the mean motion to the maximum my software allows; 1
revolution in 20 days. Fitting the other parameters yields very
similar orbits, with very high eccentricities. Hence, there is no
doubt you indeed observed ExoMars and the Briz-M, though it is unclear
still which is which.

Propagating these orbits back they do not intersect with the 41390
orbit. This is due to the elliptical orbit requiring a perigee below
the horizon to match your observations far out. An actual hyperbolic
orbit would do better here. The ground track does match pretty well
with what was predicted before hand.

Regards,
    Cees

1 00001U 0433F    16074.91889157  .00000000  00000-0  00000-0 0    00
2 00001  50.3018 297.7220 9881717  94.6136 354.0355  0.05000000    09
# 20160314.90-20160314.94, 118 measurements, 0.010 deg rms
1 99000U 0433F    16074.93774326  .00000000  00000-0  00000-0 0    00
2 99000  50.3583 297.0755 9883528  95.4389 354.3654  0.05000000    05
# 20160314.90-20160314.97, 228 measurements, 0.012 deg rms
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Received on Tue Mar 15 2016 - 08:32:33 UTC

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