Re: Ir 85 Tum Obs

From: Bjoern Gimle (b_gimle@algonet.se)
Date: Thu Oct 05 2000 - 22:35:03 PDT

  • Next message: Mike Waterman: "WATERMAN observations"

    02:25:00 +-5 is RA 20:50 +1 +-1.5 deg, 02:26:25 +-3 is RA 23:32 +63 +- 3 deg
    from predictions (+-1 sec 50% drag uncertainty)
    The middle one in Cassiopeia would be gamma, and the closest point near
    00:25 +67 at 02:26:33, from predictions.
    
    Ir 85 is lower than any other Iridium, so it needs fresh elsets to determine
    position from time. Maybe its rotation axis is also affected by the drag.
    Since it is lower, the -2 flash might have a flare angle of 1.5 deg, so the
    positional accuracy is close to the precision needed.
    
    -- bjorn.gimle@tietotech.se (office)                         --
    -- b_gimle@algonet.se (home)  http://www.algonet.se/~b_gimle --
    -- COSPAR 5919, MALMA,    59.2576 N, 18.6172 E, 23 m         --
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    > was a mag 1 flash at 02:25:00 6 Oct UTC +/- 5 sec. I wasn't ready for it
    so
    > that's why the large time +/- variance. It continued to be visible at 1x,
    > there was a brief glint just before it reached an Az of 90 deg but no time
    > was recorded. Then as it passed to the West of Cassiopeia, about 2 - 3 deg
    > (West) from the middle star in the W of Cassiopeia (sorry i don't know the
    > name of that one), it flashed to a -2 at 02:26:25 +/- 3 sec.
    >
    
    
    
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