C. Bassa via Seesat-l schreef op 8-9-2014 20:53: > Fitting an orbit to both Kevin and these observations gives: > 1 28888U 05042A 14251.77652340 .00000000 00000-0 50000-4 0 04 > 2 28888 96.9174 289.4726 0129943 0.3928 51.8245 15.71831976 03 > # 20140908.01-20140908.78, 26 measurements, 0.014 deg rms When combined with the last known orbit, this actually suggests a manoeuvre on or near 2014 July 1st ~1:40 UT (but take that accuracy with a grain of salt) when perigee was over the south pole. Apogee was lowered by almost 500 km. > Alberto Rango last saw it in June when it appeared to have manouvred > after having spent a few months in some sort of transfer orbit that > was precessing its plane West Alberto actually reported that he failed to see it early June (see his post of June 9th: http://www.satobs.org/seesat/Jun-2014/0069.html): but during low twilight passes, which might perhaps explain the non-observations. Mike McC and another US observer positively observed it late May. So did it manoeuvre early June, or did we simply lose it in twilight of the N-hemisphere summer, after which it manoeuvered at July 1st? Let's see however what results when the current orbit has been better established with a longer arc. If USA 245 is still in it's last known plane, the RAAN difference between the two should now be about 25 degrees. - Marco ----- Dr Marco Langbroek - SatTrackCam Leiden, the Netherlands. e-mail: sattrackcam_at_langbroek.org Cospar 4353 (Leiden): 52.15412 N, 4.49081 E (WGS84), +0 m ASL Cospar 4354 (De Wilck): 52.11685 N, 4.56016 E (WGS84), -2 m ASL Cospar 4355 (Cronesteyn): 52.13878 N, 4.49937 E (WGS84), -2 m ASL Station (b)log: http://sattrackcam.blogspot.com Twitter: @Marco_Langbroek PGP key: http://tinyurl.com/kur7xm8 ----- _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-lReceived on Mon Sep 08 2014 - 15:49:35 UTC
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