SATOBS ML (remote), 2 Sep 2015: Chang'e 2 r/b (2010-050B)

From: Marco Langbroek via Seesat-l <seesat-l_at_satobs.org>
Date: Thu, 3 Sep 2015 11:52:34 +0200
My periodic check-up on the very distant, trans-lunar orbitting space debris
2010-050B, the Chang'e 2 r/b.

At the moment of observation it was at a distance of ~352000 km (0.9 Lunar
Distance). It was several arcminutes off the ephemerides.


37175 10 050B   8438 F 20150902043015214 17 75 2249011+353731 56
37175 10 050B   8438 F 20150902043115081 17 75 2249034+353712 56
37175 10 050B   8438 F 20150902043215204 17 75 2249057+353691 56
37175 10 050B   8438 F 20150902043315238 17 75 2249080+353671 56
37175 10 050B   8438 F 20150902043415444 17 75 2249103+353652 56

-------------------------------------------------------------------------
0.61-meter F/10 Cassegrain + CCD + Astrometrica software + UCAC4
Sierra Stars Obs. (MPC G68), Markleeberg, California, USA,
38.8108 N, 119.7750 W, 1545 m
What these numbers mean: http://www.satobs.org/position/IODformat.html
-------------------------------------------------------------------------


Same obs as above in MPC format:

NET UCAC-4
2010-050B     C2015 09 02.18767 22 49 01.07 +35 22 23.2                      G68
2010-050B     C2015 09 02.18837 22 49 03.35 +35 22 16.2                      G68
2010-050B     C2015 09 02.18906 22 49 05.72 +35 22 08.7                      G68
2010-050B     C2015 09 02.18976 22 49 08.01 +35 22 01.7                      G68
2010-050B     C2015 09 02.19045 22 49 10.28 +35 21 54.7                      G68


The trails show a flashing behaviour with up to 3 flashes during a 30-second
exposure, i.e. a period of 8 to 15 seconds (probably close to 15 s).

Updated approximate orbit (using Bill Gray's FindOrb):


Chang'e 2 r/b  (2010-050B)
Perigee 2015 Sep 6.015978 TT =  0:23:00 (JD 2457271.515978)
Epoch 2015 Sep  2.0 TT = JDT 2457267.5                        Find_Orb

M 307.69294              (2000.0)
n  13.02473527        Peri.  178.14238
a  386151.359 km      Node   220.14938
e  0.1364029          Incl.   39.98358
q  333479.160 km      Q      438823.559 km
P  27.64 days

Chang'e 2 r/b
1 37175U 10050B   15245.00000000  .00000000  00000-0  00000-0 0    00
2 37175  39.9821 220.3700 1389278 176.4328 309.4143  0.03581671    02

 From 17 observations, 2015 July 9 - Sept 2; mean residual 0".554.


The telescope was the 0.61-meter Cassegrain of MPC G68 Sierra Stars Observatory
in California, USA.

- 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
SatTrackCam: http://home.wanadoo.nl/marco.langbroek/satcam.html
Station (b)log: http://sattrackcam.blogspot.com
Twitter: _at_Marco_Langbroek
-----


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Received on Thu Sep 03 2015 - 04:52:06 UTC

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