SATOBS ML (4353), 16 Jul 2010: Iridium 33 flash period

From: Marco Langbroek (marco.langbroek@wanadoo.nl)
Date: Sun Jul 18 2010 - 20:09:37 UTC

  • Next message: Marco Langbroek: "SATOBS ML (4353), 18 Jul 2010: USA 186"

    On the evening of July 16th I captured the flashing behaviour of the Iridium 33 
    wreckage (97-051C), infamous for the collision with Kosmos 2251.
    
    The sat was mostly visible only during the flashes (i.e., no trail start and end 
    determinable on the images). Flash times were therefore determined by 
    astrometrically measuring the flash positions, and then calibrating these 
    against a timely TLE for the object (10198.27861822). Flash period is roughly 
    3.1s, but not entirely regular. Some flashes are bright (+2 or brighter), some 
    faint (+3, +4 or fainter)
    
    b = bright flash
    f = faint flash
    
    image 1 (22:31:32.30 - 22:31:42.35 UTC, Jul 16)
    flashes at:
    22:31:33.51  (b)
           36.60  (f)
           39.75  (b)
    
    image 2 (22:32:07.30 - 22:32:17.35 UTC, Jul 16)
    flashes at:
    22:32:07.93  (f)
           11.03  (b)
           14.20  (f)
           17.24  (f)
    
    image 3 (22:32:27.30 - 22;32:37.35 UTC, Jul 16)
    flashes at:
    22:32:29.80  (b)
           32.91  (f)
           36.07  (b)
    
    image 4 (22:33:07.30 - 22:33:17.35 UTC, Jul 16)
    flashes at:
    22:33:07.39  (b)
           13.65  (b)
           17.05  (f)
    
    I observed Iridium 33 flashing too on the next evening, up to mag 0 just past 
    the zenith going north. Still have to check whether my images captured any of it 
    (all the observed mag 0 flashes happened just before or after an image exposure, 
    alas).
    
    - Marco
    
    
    -----
    Dr Marco Langbroek  -  SatTrackCam Leiden, the Netherlands.
    e-mail: sattrackcam@wanadoo.nl
    
    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
    SatTrackCam: http://home.wanadoo.nl/marco.langbroek/satcam.html
    Station (b)log: http://sattrackcam.blogspot.com
    -----
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