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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/RQCEQG5IXA2C32MB6W7D2XEKDEUMXVYL/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "RQCEQG5IXA2C32MB6W7D2XEKDEUMXVYL",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/DQDY3TVQ762BOIG2LX4BNHESKHGIFTBC/?format=api",
    "sender": {
        "address": "alexc (a) phys.au.dk",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Alexandru Csete",
    "subject": "[amsat-bb] Re: keps for earthbound objects",
    "date": "2007-08-13T21:58:09Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/OUYVGCT36HOMUOWUTTO7LT3ICBAJX47Z/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "On Mon, 13 Aug 2007 13:30:19 -0700\n\"Eric Fort\" <[email protected]> wrote:\n\n> The antennas in this case are fixed, though a movable solution would be\n> nice.   the problem is how to get the tracking program to point the\n> antennas at a fixed spot and keep them pointed there.  I'm considering\n> the assembly of a sat-gate that will do double duty on sats and\n> terrestrial work so the antennas need to be able to \"track\" both types\n> of targets.  notice the quotes around \"track\"...ultimately I'd like to\n> just specify an oblect (norad catalogue number or lat/lon) remotely and\n> have the antennas point and remain pointed at the object as my station\n> and/or the remote station (object) moves.  Im thinking to just have the\n> tracking program pull the right set of keps....but I need to create them\n> first!  I'm also open to ways to do this in ways that may be easier.\n> suggestions are welcome.\n> \n> Eric\n> \n\nWhat you want to do is not possible with a satellite tracking program.\nKeplerian elements describe the orbit of a satellite and where the\nsatellite is at a given time on this orbit. From this information, a\nsatellite tracking program calculates the position of the satellite at any\ngiven time.\nTherefore, you would have to define an orbit, where the satellite appears\nto be stationary and has practically zero altitude. This is not possible\nbecause a satellite only appears stationary at very high altitudes (e.g.\ngeostationary orbit at 35600 km above Earth surface) and the orbital\nvelocity increases as the altitude decreases. In fact, it doesn't even\nmake much sense to talk about satellite orbits at altitudes less than\n100km above the Earth.\n\nI think you will have more luck if you try to find another software for\nthis task; something that simply points your antenna to a fixed direction.\n\n73\nAlex OZ9AEC\n",
    "attachments": []
}