Re: New user, with a question-

From: Bjoern Gimle@GlocalNet (Gimle@GlocalNet)
Date: Wed Dec 03 2008 - 10:49:02 UTC

  • Next message: Russell Eberst: "2008DEC2-3.OBS"

    Hi Paul,
    
    welcome to the list. Your observation report is so detailed and well-worded
    that it surpasses many postings by long-time members! Just one detail:
    a "flaring" satellite indicates very slowly rotating, or not at all - you 
    did
    use "flashing" initially.
    
    Ed's analysis is also so convincing that I didn't do one myself.
    I just verified the apparent tracks for you, using SkyMap.
    I enclose two projections, one in RA mode, which is true in
    siderial positions, and in angles/distances near declination zero
    (polar mode is too elongated far from the pole).
    The other one is stereographic in HORizontal mode, which is
    closest to natural proportions, and true on the alt/az grid, but track 
    relative to stars is only accurate at the chosen time, 08:15 UTC.
    
    The latter image shows that the Glonass was moving WEST relative to
    the horizon, as Ed suggested, at position angle 25 degrees (1 o'clock).
    ETS 6 moved to 320 degrees ("10:40"), and would have entered
    Earth's penumbra around 08:35 at about 21380 km range,
    fully eclipsed around 08:39:50.
    
    Glonass entered penumbra around 08:25 at about 20300 km range,
    fully eclipsed around 08:29:30.
    
    (Graphs sent to Paul)
    
    -- Björn Gimle                                            --
    -- COSPAR 5917, STAR,  +18.05447 (E), +59.34185 (N), 33 m --
    -- COSPAR 5918 WGS84,  +18.10127 (E), +59.29813 (N), 44 m --
    -- COSPAR 5919, MALMA, +18.6206  (E), +59.2615  (N), 33 m --
    
    
    ----- Original Message ----- 
    From: "Ed Cannon" <edcannonsat@yahoo.com>
    To: "post seesat" <SeeSat-L@satobs.org>
    Sent: Wednesday, December 03, 2008 9:22 AM
    Subject: re: New user, with a question-
    ...
    >
    > Well, using loose search criteria, I found a suspect:
    > ETS 6, 94-056A, 23230.  It's a well-known flashing
    > satellite in a high-altitude orbit.  The Findsat
    > residuals for 08:23 UTC (00:23 PST) are 191 seconds and
    > 5.8 degrees, while using 08:20 UTC gives 25 seconds and
    > the same cross-track difference, with a declination
    > close to -4.  ETS 6 It repeats its track in very close
    > to three nights, running just a little bit earlier, so
    > you could try to confirm it -- three nights from now.
    >
    > I got one other possibility at 08:23 UTC, a Glonass
    > satellite:  95-068A, 23734, Cosmos 2325.  Residuals
    > are four seconds and three degrees.  Glonass payloads
    ... 
    
    
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