USA 186 search elements

From: Ted Molczan via Seesat-l <seesat-l_at_satobs.org>
Date: Sat, 4 Jun 2016 11:25:36 -0400
Alberto Rango reported USA 186 running more than 6 minutes late relative the epoch 16151.09494963 TLE, which indicates
that it has manoeuvred to a higher orbit:

http://satobs.org/seesat/Jun-2016/0015.html

Mike McCants offers the following estimate of the new orbit:

USA 186                                                  260 X 433 km
1 28888U 05042A   16155.80123938  .00035000  00000-0  15058-3 0    00
2 28888  96.8849 194.1898 0129014 105.5389 254.4609 15.73273604    06

I offer the following, based on the assumption that it manoeuvred on 2016 Jun 02 UTC, at a passage through perigee. I
can only guess which perigee, but it probably was not much earlier than that of 10:02 UTC, or much later than that of
19:11 UTC. Line zero states the assumed re-boost time upon which the TLE is based.

Re-boost 10:02:07 UTC                                    255 X 457 km
1 70001U          16155.80153643  .00035094  00000-0  14940-3 0    01
2 70001  96.8849 194.2010 0149974 105.5139 256.2741 15.70053801    06

Re-boost 14:36:26 UTC                                    255 X 461 km
1 70002U          16155.80152371  .00034666  00000-0  14940-3 0    03
2 70002  96.8849 194.2009 0153225 105.5140 256.3101 15.69277285    04

Re-boost 19:10:45 UTC                                    255 X 467 km
1 70003U          16155.80150642  .00034102  00000-0  14940-3 0    08
2 70003  96.8849 194.2009 0157674 105.5141 256.3594 15.68215030    03

It would be prudent to first attempt to recover it in Mike's orbit, but to be prepared for it to arrive during the time
span given by my orbits. It could run a little earlier than the 70001 TLE, or a little later than the 70003 TLE.

Happy hunting!
Ted Molczan


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Received on Sat Jun 04 2016 - 10:26:22 UTC

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