Re: BY MUOS 5 Candidate 2 and change to #1

From: C. Bassa via Seesat-l <seesat-l_at_satobs.org>
Date: Sun, 9 Oct 2016 10:54:01 +0200
Hi Brad,

These positions (your resolved first candidate) are matched by ISON
object 143118.
41622 16 041A   7778 G 20161008094006000 27 25 1806107-030630 17 S
41622 16 041A   7778 G 20161008094106000 27 25 1807083-030602 17 S

The second candidate (these positions) looks promising, as a circular
orbit fit to the two points gives a RAAN and inclination comparable to
that expected for MUOS5.
41622 16 041A   7778 G 20161008093833000 27 25 1922287-000523 17 S
41622 16 041A   7778 G 20161008093933000 27 25 1923238-000304 17 S

Propagating the last optical orbit to the apogee at 16:16UT on October
6, and fitting only for mean motion, eccentricity and inclination, as
expected for a perigee raising/inclination decreasing maneuver, I get
a perfect fit, yielding this orbit:

MUOS 5
1 41622U 16041A   16280.67809028  .00000000  00000-0  00000-0 0    07
2 41622   9.7019 320.9165 0837842 185.8385 180.2365  1.09645352    09
# 20161008.40-20161008.40, 2 measurements, 0.002 deg rms

The faintness you reported it at is a bit worrying, though varies significantly.

It would be great if you could confirm it in the orbit above, but this
will only work if it hasn't maneuvered more.

Regards,
    Cees
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Received on Sun Oct 09 2016 - 03:54:37 UTC

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