SATOBS ML (remote), 24 Oct 2015: 2013-070B (Chang'e 3 rb) & flash periodicity change

From: Marco Langbroek via Seesat-l <seesat-l_at_satobs.org>
Date: Sat, 5 Dec 2015 15:42:35 +0100
39459 13 070B   9461 G 20151024174018000 17 75 2134498-134107 56 I+155 10
39459 13 070B   9461 G 20151024180210000 17 75 2135159-134583 56 I+157 10
39459 13 070B   9461 G 20151024180643000 17 75 2135213-134679 56 I+153 10
39459 13 070B   9461 G 20151024181003000 17 75 2135253-134749 56 I+158 10
39459 13 070B   9461 G 20151024181440000 17 75 2135308-134844 56 I+155 10

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0.60-meter F/3 Schmidt + CCD + Astrometrica software + UCAC4
Piszkéstetö Stn. (Konkoly Obs.). (MPC 461), Hungary
47.91754 N,  19.89365 E, 938 m
What these numbers mean: http://www.satobs.org/position/IODformat.html
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Much belated report (I only received the images last week) on 2013-070B, the 
Chang'e 3 r/b in trans-Lunar orbit.

These are 5 points out of a series of 60 images of 5 seconds each taken by 
Krisztián Sárneczsky with the 60-cm Schmidt of Piszkéstetö Stn. (MPC 461) in 
Hungary, in evening twilight of October 24.

The long image series primarily served to map the brightness variation of this 
slowly tumbling trans-Lunar object.

In mid September I determined a peak-to-peak periodicity of 423 seconds. For 
this new late October series, I find a peak-to-peak periodicity of 384 seconds, 
39 seconds less. So the periodicity is evidently changing.

There is also a hint of a fainter secondary maximum inbetween two main peaks.

Brightness profile can be seen here:
https://drla.stackstorage.com/index.php/s/AbQ97uQTcFEuaYD

Same obs as above, but in MPC format:

NET UCAC-4
2013-070B     C2015 10 24.73632 21 34 49.80 -13 24 38.6          15.5 R      461
2013-070B     C2015 10 24.75151 21 35 15.94 -13 27 29.8          15.7 R      461
2013-070B     C2015 10 24.75467 21 35 21.34 -13 28 04.4          15.3 R      461
2013-070B     C2015 10 24.75698 21 35 25.27 -13 28 29.8          15.8 R      461
2013-070B     C2015 10 24.76019 21 35 30.76 -13 29 03.7          15.5 R      461

- 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
Station (b)log: http://sattrackcam.blogspot.com
Twitter: _at_Marco_Langbroek
-----
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Received on Sat Dec 05 2015 - 08:42:59 UTC

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