Re: Predicting Molniya Look Angles

From: Bill Frost (billfrost@bigpond.com)
Date: Thu Jun 15 2006 - 00:42:22 EDT

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    Paul Floyd asked about the easiest way of predicting Molniya (or any other satellite that isn't listed in the standard HA set for the observer's location).
    
    Like a few on this list, I use Orbitron, which is a free download from http://www.stoff.pl/downloads.php.
    
    After configuring Orbitron for your location, you can run a Molniya prediction with these steps:
    
    1   Click on 'Autoupdate TLE', to load the latest elsets.
    2   Click on 'Load TLE'
    3   Double click on 'Molniya.txt'
    4   Right click on the list of Molniyas and click 'Track All'
    5   Click 'Prediction Setup' (tabbed dialogue box)
    6   Find the check boxes in the group 'Search passes for' and select 'All'. Ensure 'Ignore if magnitude is unknown' is selected.
    7   Click 'Prediction' (tabbed dialogue box).
    8   Click 'Predict' command button
    
    Cheers
    
     
    Bill Frost,
    Canberra, Australia
    
    
    If you elect to save to a text file, output looks like this:
    
    Satellite passes / Orbitron 3.71 / www.stoff.pl
    
    Location      : Gordon, ACT (home) (149.0872° E, 35.4483° S)
    Time zone     : UTC +10:00
    Search period : 2006-06-15 14:36:14 - 3 days
                    2006-06-18 14:36:14
    Conditions    : Maximum sun elevation = -5 deg
                    Minimum sat elevation = 10 deg
                    Illumination required
    
    Time                Satellite              Azm  Elv  Mag Range S.Azm S.Elv
    --------------------------------------------------------------------------
    2006-06-15 18:08:00 MOLNIYA 1-87         294.0 68.6    ?  5936 288.8 -14.0
    2006-06-15 18:34:43 MOLNIYA 3-39         122.1 42.6    ?  3086 285.4 -19.2
    2006-06-15 19:28:12 MOLNIYA 1-91         216.3 10.2    ?  3728 278.7 -29.9
    2006-06-16 00:45:48 MOLNIYA 3-46           9.4 38.2    ? 10202 140.5 -74.9
    2006-06-16 02:43:08 MOLNIYA 3-43          56.8 26.7    ?  4125  98.4 -53.6
    2006-06-16 05:21:16 MOLNIYA 1-87          67.8 31.6    ?  5918  76.1 -21.6
    2006-06-16 18:03:05 MOLNIYA 1-87         294.0 68.8    ?  5924 289.5 -13.1
    2006-06-16 18:31:32 MOLNIYA 3-39         122.0 43.2    ?  3075 285.9 -18.6
    2006-06-16 19:23:32 MOLNIYA 1-91         216.4 10.2    ?  3729 279.4 -28.9
    2006-06-17 00:39:04 MOLNIYA 3-46          10.7 37.7    ? 10351 145.7 -75.8
    2006-06-17 01:07:03 MOLNIYA 1-84         298.6 11.6    ? 11422 127.4 -71.8
    2006-06-17 02:37:58 MOLNIYA 3-43          56.8 26.5    ?  4145  99.4 -54.7
    2006-06-17 05:16:21 MOLNIYA 1-87          67.8 31.4    ?  5935  76.7 -22.7
    2006-06-17 17:58:11 MOLNIYA 1-87         294.1 69.1    ?  5915 290.2 -12.1
    2006-06-17 18:28:20 MOLNIYA 3-39         122.0 43.7    ?  3064 286.4 -17.9
    2006-06-17 19:18:52 MOLNIYA 1-91         216.4 10.3    ?  3729 280.0 -27.9
    2006-06-18 00:12:59 MOLNIYA 1-84         302.3 20.8    ?  9196 170.8 -77.8
    2006-06-18 00:32:18 MOLNIYA 3-46          12.0 37.2    ? 10489 151.6 -76.5
    2006-06-18 02:32:49 MOLNIYA 3-43          56.8 26.3    ?  4164 100.4 -55.8
    2006-06-18 05:11:28 MOLNIYA 1-87          67.9 31.3    ?  5947  77.3 -23.7
    
    
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