Re: Spectacular Double-Geosat Flare...Again!

From: Björn Gimle (bg_26934@glocalnet.net)
Date: Tue Feb 28 2006 - 02:54:59 EST

  • Next message: Björn Gimle: "Fw: Two Unidentified Sats 25/02/06"

    The center of the geoflares is at the Sun's declination,
    so it currently moves north. But to have the operational
    geosats a degree further north, you must travel six degrees
    south on the Earth's surface.
    
    Also note that the center of the Earth's shadow is at
    the anti-solar right ascension at local midnight,
    but at the opposite declination of the Sun!
    It is offset by the observers latitude, and also by
    the time of night. It moves < -00:10/hour in R.A.
    
    Also note that some geos (including XM-1/2?) have
    booster reflectors (at 60 deg angles?) causing extra
    flares 3-4 hours before/after expected maximum.
    
    Sun at 22:46 Latitude: 0     0     0    40    40    40    60    60    60
            -7.8 Time  20:00 23:00 24:00 20:00 23:00 24:00 20:00 23:00 24:00
    
    Shadow radius:      9.36 10.13 10.19  9.02  9.73  9.79  8.65  9.31  9.36
    Declination offset: 0.00  0.00  0.00 -5.80 -6.25 -6.29 -7.50 -8.06 -8.11
    RA offset:         00:32 00:10 00:00 00:23 00:07 00:00 00:14 00:04 00:00
    
    Declination:        7.80  7.80  7.80  2.00  1.55  1.51  0.30 -0.26 -0.31
    RA:                11:18 10:56 10:46 11:09 10:53 10:46 11:00 10:50 10:46
    
    Excel file available on request.
    
    ----- Original Message ----- 
    ...
    >  Question: What do you believe the
    > geographic extent of the visibility of this event? And
    > which way does it move night after night - north or
    > south?
    >
    
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