Re: Time again for flaring GEOSATS

From: Bjoern Gimle (b_gimle@algonet.se)
Date: Wed Sep 13 2000 - 23:00:05 PDT

  • Next message: Brierley David: "RE: irregular flasher?"

    It is easy to find where to look. Find the Sun's RA and Dec.
    Add 12h to RA, reverse the sign of Dec. Then subtract your
    latitude/7 (add if S). A fifteen degree ring around that spot
    is the best. Actually it moves about 2 degrees/hour sideways during the
    night.
    
    A better image is provided with SkyMap. Use the F7/Equatorial view
    and an elset file like GEO.tle from Mike or OIG, or Alan's SATBASE
    with F7/F9/F7 set to 30000,40000. Set Duration to 2:00.
    F7/L/F5 must be at least 14. You can use F4/F2/Sun to point to
    the Sun, then add 12h or 180 deg depending on Map view, adjust
    Dec or altitude as above.
    
    You will see a "black hole". I suppose the majority of flashers
    will be the ones will be the still actively stabilized, and
    pass near the centerline on the optimum dates, then moving to the
    northern limb during the following week.
    
    I have a sample on http://www.algonet.se/~b_gimle/gif/geoflare.jpg
    (for lat. -39 Sep.15 22:00-24:00 UTC+9.5) and can generate a few
    specific for your lat and desired date, if you have problems with SkyMap.
    
    -- b_gimle@algonet.se (home)  http://www.algonet.se/~b_gimle --
    -- SeeSat-L / Visual Satellite Observer Home Page found at   --
    -- http://www2.satellite.eu.org/satintro.html      --
    
    
    
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