Hi all, Used the 0.61-m telescope of Sierra Stars Observatory in California to make more observations of 2010-050B, the Chang'e 2 r/b from the Chinese Chang'e 2 Lunar mission. An object moving in a trans-Lunar (!) orbit. It was still near apogee at almost two Lunar distances from earth during these observations (distance was just short of 518 800 km in fact). It is quite cool to image space junk at this distance! In MPC format: COD G68 OBS M. Langbroek MEA M. Langbroek TEL 0.61-m f/10 Cassegrain + CCD ACK ART SAT 2010-050B Chang'e 2 rb obs G68 10 May 2015 NET UCAC-4 2010-050B C2015 05 10.31128 15 26 52.88 +04 12 58.7 15.8 R G68 2010-050B C2015 05 10.31267 15 26 53.66 +04 13 24.4 15.3 R G68 2010-050B C2015 05 10.31439 15 26 54.60 +04 13 54.1 15.3 R G68 2010-050B C2015 05 10.31545 15 26 55.16 +04 14 13.2 15.3 R G68 in IOD format: 37175 10 050B 8438 F 20150510072815391 17 75 1526529+042163 56 S+158 10 37175 10 050B 8438 F 20150510073015092 17 75 1526537+042234 56 S+153 10 37175 10 050B 8438 F 20150510073242670 17 75 1526546+042317 56 S+153 10 37175 10 050B 8438 F 20150510073415377 17 75 1526552+042370 56 S+153 10 Combining this with the May 7 observations by the Catalina Sky Survey (MPC 703) and Peter Starr's May 7 observations from Warrumbungle Observatory (MPC Q65) yields the following orbit: Orbital elements: 2010-050B Chang'e 2 r/b Perigee 2015 May 22.689019 +/- 0.00747 TT = 16:32:11 (JD 2457165.189019) Epoch 2015 May 7.0 TT = JDT 2457149.5 Find_Orb M 198.75910 +/- 0.037 n 10.27730942 +/- 0.00562 Peri. 151.22410 +/- 0.028 a 452220.817 +/- 165 km Node 226.29285 +/- 0.00006 e 0.2197903 +/- 0.000308 Incl. 41.13389 +/- 0.00028 q 352827.032 +/- 267 km Q 551614.602 +/- 68 km P 35.03d H 28.1 From 23 observations 2015 May 7-10; mean residual 0".307. In TLE form: Chang'e 2 r/b 352827 x 551615 km 1 00000U 15127.00000000 .00000000 00000-0 00000-0 0 09 2 00000 41.1326 226.5090 2163618 150.9650 199.0248 0.02835833 01 - 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 4355 (Cronesteyn): 52.13878 N, 4.49937 E (WGS84), -2 m ASL Station (b)log: http://sattrackcam.blogspot.com Twitter: _at_Marco_Langbroek ----- _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-lReceived on Sun May 10 2015 - 11:55:21 UTC
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