Hi Greg, Thanks for the observations. Naively fitting a very high eccentricity elliptical orbit to the two tracks yield the solutions below. Here I have fixed the mean motion to the maximum my software allows; 1 revolution in 20 days. Fitting the other parameters yields very similar orbits, with very high eccentricities. Hence, there is no doubt you indeed observed ExoMars and the Briz-M, though it is unclear still which is which. Propagating these orbits back they do not intersect with the 41390 orbit. This is due to the elliptical orbit requiring a perigee below the horizon to match your observations far out. An actual hyperbolic orbit would do better here. The ground track does match pretty well with what was predicted before hand. Regards, Cees 1 00001U 0433F 16074.91889157 .00000000 00000-0 00000-0 0 00 2 00001 50.3018 297.7220 9881717 94.6136 354.0355 0.05000000 09 # 20160314.90-20160314.94, 118 measurements, 0.010 deg rms 1 99000U 0433F 16074.93774326 .00000000 00000-0 00000-0 0 00 2 99000 50.3583 297.0755 9883528 95.4389 354.3654 0.05000000 05 # 20160314.90-20160314.97, 228 measurements, 0.012 deg rms _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-lReceived on Tue Mar 15 2016 - 08:32:33 UTC
This archive was generated by hypermail 2.3.0 : Tue Mar 15 2016 - 13:32:33 UTC