The objects of the 2012-025-launch

From: Bram Dorreman (bram.dorreman@gmail.com)
Date: Tue May 29 2012 - 17:54:45 UTC

  • Next message: C. Bassa: "Re: The objects of the 2012-025-launch"

    In the early morningtwilight of 2012-05-29 I wanted to see the objects
    of this launch.
    I expected a flashy behaviour of objects E, F, G and H.
    They were not disappointing.
    
    I saw several objects in order of appearance (predicted culmination times):
    
    01:28:14 12025E 38341 H-2A rocket
    01:48:08 12025H 38347 H-2A rocket debris
    01:53:54 12025G 38346 H-2A rocket debris
    01:55:42 12025F 38345 H-2A rocket debris
    02:05:40 12025B 38338 Kompsat 3
    02:16:06 12025A 38337
    
    The rocket showed a irregular brightness variation with a flash period
    not easy to determine. Something like 15 seconds with several
    secondary maxima.
    It needs further investigation.
    It displayed flashes of magnitude +2 may be even +1.
    It was visible to the naked eye all the time: minimum magnitude + 4.5.
    
    The three rocket debris showed also irregular brightness variations.
    The first one had no very short flashes, the 2nd and 3rd had.
    >From this I derive that
    - 12025H is probably an adapter
    - 12025G is a fairing half
    - 12025F is the other fairing half
    
    12025B Kompsat was steady with magnitude +4.8 at zet Dra.
    
    12025A GCOM W1 was also steady and reached magnitude +4.6 at eps CrB.
    
    Bram Dorreman mostly naked eye in this case.
    Site 4160: 51.27931 N, 5.47683 E, 35 m (WGS84)
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