Re: Flasher UNID

From: Björn Gimle (b_gimle@algonet.se)
Date: Sat Aug 13 2005 - 06:33:38 EDT

  • Next message: Ted Molczan: "RE: Flasher UNID"

    ----- Original Message ----- 
    
    > Yesterday evening (Aug 11th 2005) I was outside watching Perseids with a
    > friend.
    > At 21:26 UTC (+/- 30 secs) she (first time satellite observer :) )
    > spotted a bright flasher just east ("below") Cassiopeia. It gave 2
    ...
    > After 3 or 4 couples of flashes it apparently entered earth shadow,
    > even if my friend insists she've seen it just over the horizon after
    > following the imaginary line of the orbit. I still think it eclipsed
    > below Cassiopeia.
    >
    > My location was roughly
    > 8°31'47'' E
    > 45°41'23'' N
    >
    > I hope I gave all the info you could need....if not just ask.
    >
    > What's the standard procedure to id one of these?
    >
    There is a tool, IDsat by Ted Molczan, which tells you all objects close
    enough in time and position to one given position (RA and declination)
    But this gives no clue to the direction of motion, so I prefer using my
    favourite prediction program, SkyMap by Rob Matson (see
    http://www.satobs.org/orbsoft.html)
    That way I can quickly disregard those that move in the wrong direction, or
    too fast or too slow.
    
    BTW it is better to estimate the direction of motion relative to a vertical
    line through the satellite, than the imaginary line all the way to horizon.
    And the position as a distance and direction from a known star (or even
    better: the fraction between two stars - or the extended line between them)
    
    You can see from the times on the NOAA 11 track that it moved to the left
    (DIR ~250 degrees), at about 20 degrees/ minute
    (0.3 degrees/s)
    
    /Björn Gimle
    
    -- COSPAR 5919, MALMA,    59.2576 N, 18.6172 E, 23 m         --
    -- COSPAR 5918, HAMMARBY, 59.2985 N, 18.1045 E, 44 m         --
    
    
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