Since I posted my epoch 05129.10360012 elset of 96072A, additional observations became available, so I have analyzed the larger data set, and replaced the earlier elset with this one: USA 129 15.0 3.0 0.0 5.3 v 1 24680U 96072A 05129.10360041 .00009106 00000-0 12435-3 0 03 2 24680 97.9728 192.9242 0525480 285.6540 68.7299 14.73013634 00 Arc 2005 May 05.92 - 09.11, WRMS residuals = 0.020 deg Last night, the object was running nearly 0.7 s early relative the above, indicating a significant increase in rate of decay, perhaps related to the geomagnetic storm of May 08 UTC. I produced this reduced-arc elset, by propagating the above elset to the ascending node prior to the latest observations, and adjusting only B* (the decay term), mean anomaly and mean motion: USA 129 15.0 3.0 0.0 5.3 v 1 24680U 96072A 05130.12250838 .00012092 00000-0 16499-3 0 01 2 24680 97.9728 193.9300 0525400 282.3745 71.9156 14.73045721 09 Arc 2005 May 08.84 - 10.13, WRMS residuals = 0.016 deg As for Lacrosse 5, I am reasonably certain that this was its orbit until late on May 08 UTC: 1 28646U 05016A 05128.93811057 .00000042 00000-0 10000-4 0 02 2 28646 57.0097 98.9510 0004211 173.0227 187.0846 14.53350785 03 Arc 2005 May 05.10 - 08.96, WRMS residuals = 0.030 deg There appears to have been a subsequent small manoeuvre, perhaps a nudge closer to the eccentricity and argument perigee of the typical 57 deg Lacrosse frozen orbit. Here are preliminary elements, based on a fairly short arc: Lacrosse 5 0.0 0.0 0.0 3.4 v 1 28646U 05016A 05130.03868548 .00000042 00000-0 10000-4 0 03 2 28646 57.0063 94.8667 0001657 79.1016 281.0183 14.53353903 01 Arc 2005 May 09.09 - 10.20, WRMS residuals = 0.021 deg Ted Molczan ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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