Marco Langbroek via Seesat-l schreef op 20-4-2014 15:20: > > Hi all > > Yesterday in late twilight near 20:07 UT I observed the Dragon CRS-3 chasing the > ISS by about one minute, and also a 3rd object related to the Dragon launch, > 2013-022C/39682, a few minutes earlier. It turns out I misidentified this piece as well as the other piece which I reported in another e-mail. I had not realized the very large influence of element epoch in this case even after less than a day. After astrometrically measuring the images and picking orbital elements for each piece with epoch closest to the time of observation, I got much better fits and a change of ID's: 1) The piece I imaged near 20:02:52 UT (epoch 1409.835) is not piece C, but piece H (39687). * residuals -2.58s, 0.07 x-track, element epoch 14110.19535714 2) The piece I imaged near 20:04:07 UT (epoch 1409.836) is not piece H, but piece G (39686). * residuals -3.57s, 0.04 x-track, element epoch 14110.25921489 39687 14 022H 4353 G 20140419200254000 17 75 0732322-031110 56 (+/- 1 sec) 39686 14 022G 4353 G 20140419200412300 17 75 0833048-075620 56 These two pieces are likely the solar panel covers. - 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 ----- _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-lReceived on Mon Apr 21 2014 - 06:50:05 UTC
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