RE: 4541 SATOBS OTV3.

From: Ted Molczan via Seesat-l <seesat-l_at_satobs.org>
Date: Mon, 9 Jun 2014 00:11:54 -0400
Alberto Rango wrote:

> In a break in the clouds I saw OTV3.
>
> 39025 12 071A   4541 F 20140609022740050 17 24 1927930-212447 57 S+035 05

Alberto's observation was more than 4 min. late relative the elements I posted yesterday. I found that a mean motion of
~15.727 rev/d fit the above and his 3rd point of June 8 fairly well, and also had time residuals of only ~7 s relative
Kevin Fetter's observations of June 1 UTC. Adding Kevin's observations revealed the more eccentric orbit below, which
also passed close to Alberto's 2nd point of June 8. The only point during Jun 1-9 UTC that does not fit is Alberto's
first of June 8.

OTV 3                                                    295 X 411 km
1 39025U 12071A   14160.08158566  .00000000  00000-0  00000-0 0    04
2 39025  43.5036 176.0247 0086395  38.2388 322.4574 15.72764683    08
Arc 20140601.35-0609.1 WRMS resid 0.117 totl 0.042 xtrk

The above seems plausible in that the apogee is similar to that of the previous more circular orbit (below), which
suggests a manoeuvre to lower the perigee. In the interim, there were several near-intersections between the two
orbits, near apogee.

                                                         384 X 408 km
1 39025U 12071A   14125.07869212  .00000000  00000-0  00000-0 0    01
2 39025  43.4952  24.9542 0017308 120.6630 239.3365 15.57802585    08

For the new orbit, I recommend allowing for 1 min. time uncertainty per 24 h from epoch, and 1 deg track uncertainty on
high elevation passes.

Ted Molczan


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Received on Sun Jun 08 2014 - 23:12:26 UTC

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