Kevin Fetter rediscovered ORS 1 as an UNID overnight and reported his observations: http://satobs.org/seesat/Sep-2012/0107.html Since the object manoeuvres to maintain its orbit against drag, I have fit an orbit that minimizes the along-track error over the past month, which probably spans several reboosts: ORS 1 417 X 419 km 1 37728U 11029A 12254.38102251 .00000000 00000-0 00000-0 0 09 2 37728 40.0000 325.4826 0002000 342.1879 17.8861 15.50381280 03 Arc 20120807.07-0910.4 WRMS resid 9.252 totl 0.068 xtrk During that period, the prediction time error is within +/- 30 s, with reasonable cross-track accuracy. For future predictions, I recommend allowing at least +/- 60 s prediction time uncertainty, with allowance for Earth's rotation over the interval. With additional observations it may be possible to refine the mean mean-motion. Ted Molczan _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-l
This archive was generated by hypermail 2b29 : Mon Sep 10 2012 - 22:54:52 UTC