Iridium Flares taken from orbit - identifying constellations

From: George Roberts (
Date: Fri Mar 28 2003 - 17:18:32 EST

  • Next message: Robert Holdsworth: "Re: Space Station Science Picture of the Day (fwd)"

    > Space Station Science Picture of the Day
    No wonder someone (sorry I forget who!) had trouble identifying the
    star field!!  2/3 of these "stars" are from the camera.  The true stars
    all have the same smile-like shape caused by tracking error.  The false
    stars are mostly a single bright pixel.
    I've had this same problem with digital cameras with long exposures.  Usually
    one can just subtract a black picture taken while the camera was at the same
    temperature for the exact same number of seconds.
    - George Roberts
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