STSS Demo 1 brightness variation

From: Marco Langbroek (
Date: Wed Mar 17 2010 - 16:02:32 UTC

  • Next message: Tim Luton: "TML obs of 2010 MAR 17 UTC"

    Hi all,
    On February 20, I photographically captured what appeared to be a brief 
    pulsatimng brightness event of he STSS Demo 2 (09-052B):
    I now captured a very similar phenomena with the other STSS demo object from 
    this launch, STSS demo 1 (09-052A), yesterday evening (March 16). Image and 
    brightness profiles can be seen here:
    In February the STSS Demo 2 pulse had a rather stable period of 0.13s. For the 
    16 March STSS Demo 1 pulse I find a rather stable period of 0.16s.
    Like the February observation, the pulse is present during the first 2 seconds 
    of a 10 second trail image only (and not on other trail images from the same 
    series). For this reason, I do not want to exclude some instrumental effect from 
    the camera (even if I fail to see how that would create such a pulse in the 
    trail. Tremor, for example, creates a wobble, not pulsing brightness).
    - Marco
    Dr Marco Langbroek  -  SatTrackCam Leiden, the Netherlands.
    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:
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