The Asteroid that wasn't: Chang'e 2 rb (2010-050B) observations

From: Marco Langbroek via Seesat-l <seesat-l_at_satobs.org>
Date: Sat, 09 May 2015 00:16:53 +0200
Hi all,

On May 7 (2015) an artificial object near mag. +17 in a trans-lunar orbit was 
briefly mistaken for a Near Earth Asteroid.

Originally reported under temporary designation WJ297AD by the Catalina Sky 
Survey, it was later identified by Jacques Cristovaoas as an artificial object, 
2010-050B, the r/b from the Chinese Chang'e 2 Lunar mission:

https://groups.yahoo.com/neo/groups/mpml/conversations/messages/31072

Bill Gray pointed out it was about 40' off from predictions:

https://groups.yahoo.com/neo/groups/mpml/conversations/messages/31073

Peter Starr from MPC Q65 Warrumbungle Obs. in Australia imaged the object a few 
hours after the Catalina observations, when it was still on the NEOCP as a 
potential Near Earth Asteroid. I measured his images for him yesterday and at 
that time already wondered about the odd orbit resulting.

Images are here:

http://sattrackcam.blogspot.nl/2015/05/an-asteroid-that-wasnt-chinese-change-2.html

2010-050B was at a distance of about 535 500 km, almost two Lunar distances (!), 
when these images were taken.

Below are the data from Q65 Warrumbungle, in MPC format (the format used for 
asteroid observations):


OBS P. Starr, M. Langbroek
MEA M. Langbroek
TEL 0.51-m f/6.8 Dall-Kirkham + CCD
NET UCAC-4
2010-050B     C2015 05 07.57888 14 27 10.11 -07 53 13.5                      Q65
2010-050B     C2015 05 07.57987 14 27 10.52 -07 52 56.5                      Q65
2010-050B     C2015 05 07.58086 14 27 10.92 -07 52 40.5                      Q65
2010-050B     C2015 05 07.58185 14 27 11.31 -07 52 25.1                      Q65
2010-050B     C2015 05 07.58284 14 27 11.71 -07 52 08.4                      Q65
2010-050B     C2015 05 07.62109 14 27 28.14 -07 41 28.8          16.7 R      Q65
2010-050B     C2015 05 07.62170 14 27 28.42 -07 41 18.1          16.6 R      Q65
2010-050B     C2015 05 07.62235 14 27 28.69 -07 41 07.4          16.7 R      Q65
2010-050B     C2015 05 07.62299 14 27 29.00 -07 40 56.9          16.7 R      Q65
2010-050B     C2015 05 07.62361 14 27 29.28 -07 40 45.9          17.0 R      Q65

In IOD format:

37175 10 050B   9331 G 20150507135335000 17 25 1427101-078871 37 S
37175 10 050B   9331 G 20150507135501000 17 25 1427105-078824 37 S
37175 10 050B   9331 G 20150507135626000 17 25 1427109-078779 37 S
37175 10 050B   9331 G 20150507135752000 17 25 1427113-078736 37 S
37175 10 050B   9331 G 20150507135917000 17 25 1427117-078690 37 S
37175 10 050B   9331 G 20150507145422000 17 25 1427281-076913 37 S
37175 10 050B   9331 G 20150507145515000 17 25 1427284-076884 37 S
37175 10 050B   9331 G 20150507145611000 17 25 1427287-076854 37 S
37175 10 050B   9331 G 20150507145706000 17 25 1427290-076825 37 S
37175 10 050B   9331 G 20150507145800000 17 25 1427293-076794 37 S

Note: Warrumbungle has Cospar code 9331 (31.27633 S, 149.19313 E, 552 m ASL)


- 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
-----
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Received on Fri May 08 2015 - 17:17:55 UTC

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