Re: Mir reentry video

From: Tony Beresford (
Date: Fri Mar 23 2001 - 23:45:11 PST

  • Next message: Tony Beresford: "Re: Mir reentry video"

    At 01:14 24/03/01 , Thomas A. Troszak wrote:
    >Having seen the Mir reentry video on CNN last night, it becomes apparent
    >that the debris passed across the entire field of view in about 15
    >seconds (I didn't actually time it yet), MUCH faster than a typical
    >"fast satellite" pass.
    Tom your dedeuction from the video isnt consistent with the immediate
    statement of the CNN correspondent Hugh Williams, who said it took
    a minute to a minute and a half to pass over Fiji.
    The time for an overhead pass of an object in a 100Km high circular orbit,
     can be worked out using plane geometry. The answer is about 2 minutes
    from 20 degrees elevation to 20 degrees elevation thru the zenith.
    One just calculates the great circle distance to an object at an elevation
    of 20 degrees and a height of 90 Km. double this answer, and calculate
    the fraction of the orbital period that this angle represents.
    A shorter time isnt possible. 
    Tony Beresford
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