unid flashing geosynch

From: Ed Cannon (ecannon@mail.utexas.edu)
Date: Mon Sep 20 2004 - 06:06:26 EDT

  • Next message: Mike McCants: "Re: unid flashing geosynch"

    Last night looking for Gorizont 29 (which I have not been
    able to see the last week or two) I saw an unid flashing 
    geosynch.  The brightest maxima were +4.5.  The flash 
    period was about 42 or a multiple of that.  I could not 
    see every maximum with my 8x42 binocular, and after 15 or 
    20 minutes I could no longer see it at all.  Mike got it
    in the telescope somewhat later.  There were two or three 
    known objects nearby but no match in the geo.tle file.  
    My very approximate positional points:
    2004-09-20 UTC
    04:20? star RA 19:13:10.8, Dec -12.4 (2000) -- It went 
    .25 deg or less (maybe less than .10 deg), passing north 
    of the star.
    04:30 RA 19:20?, Dec -12.5?
    05:00 RA 19:50, Dec -13
    In the telescope it was interesting, with tertiary maxima 
    and the primaries appearing at least part of the time to 
    be very quick doubles or triples (flickers).
    BCRC site: 30.315N, 97.866W, 280m.
    We saw Gorizont 15 (88-028A, 19017) for a little while,
    with flash period under 15 seconds -- the second shortest
    flash period of a geosynch, that I can remember.  (The 
    shortest is Superbird A at 11.2 seconds.)
    Geosat Galaxy 11 (99-071A, 26038) has been visible the
    last few evenings with my 8x42.   Last night I'm pretty
    sure that I also could see DBS 3 (95-029A, 23598) next to
    it.  With the telescope the previous two nights, Nimiq 1 
    (99-027A, 25740) was seen, much fainter, very near DBS 3.  
    (Thank you very much to Mike for identifying them!)  I saw 
    another one later last night but am out of steam to try 
    to identify it.  Flaring geosat season is beginning here, 
    but these are anomalous, in that they are flaring about 
    three hours before shadow entry (as has been observed of 
    some of them in previous seasons).
    Ed Cannon - ecannon@mail.utexas.edu - Austin, Texas, USA
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