Fw: significantly different predictions by different programs

From: Bruce MacDonald (macdonalddevizes@tiscali.co.uk)
Date: Mon Oct 30 2006 - 17:45:34 EST

  • Next message: Mike McCants: "Re: significantly different predictions by different programs"

    >> I'll have a go running some predictions of classified objects using both
    >> my programs to see what happens.
    >
    >
    > Well I ran both programs for predictions from classfd.tle for site 2751. 
    > Taking 91-017A as an example,  Skymap produces the following prediction 
    > for tomorrow morning (UTC):
    >
    >           Start of Track     Peak Elevation       End of Track
    >  Date     Time   Azim Elev   Time   Azim Elev   Time   Azim Elev VMag Cat 
    > # Satellite Name
    > -------- -------- ---- ---- -------- ---- ---- -------- ---- ---- ---- -----
    > --------------
    >
    > 6/10/31  4:34:24 327 47   4:34:24 327 46   4:38:34  28 10   2.7 
    > 21147 Lacrosse 2
    >
    > Orbitron produces this prediction:
    >
    >
    > Time                Satellite              Azm  Elv  Mag Range S.Azm S.Elv
    > --------------------------------------------------------------------------
    > 2006-10-31 04:34:28 Lacrosse 2           329.8 46.1  2.9*  872  83.9 -22.9
    > 2006-10-31 04:34:28 Lacrosse 2           329.8 46.1  2.9*  872  83.9 -22.9
    > 2006-10-31 04:38:35 Lacrosse 2            28.0 10.0  5.0  2063  84.7 -22.3
    >
    > For this object there's not much difference - 4 s and 2.8 degrees of 
    > azimuth at peak elevation.   I haven't the time right now to try the same 
    > on a high-altitiude sat, but it would be interesting to see what the 
    > difference is.
    >
    > Bruce MacDonald
    > COSPAR Site 2751
    > Devizes, Wiltshire, United Kingdom
    > 51.3440 N 1.9849 W 125M (WGS 84) 
    
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