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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/TOYAMCBSI4XY37WUBE2SOYBECBENVN3P/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "TOYAMCBSI4XY37WUBE2SOYBECBENVN3P",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/TOYAMCBSI4XY37WUBE2SOYBECBENVN3P/",
    "sender": {
        "address": "MLengruesser (a) aol.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "[email protected]",
    "subject": "[amsat-bb] Re: How to add Moon Keps to SatPC32",
    "date": "2010-02-23T09:36:54Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "\n\n\n\n \nHi Laurent,\n\nAttention: The Moon TLE (2line) it's not usefull for the \"SGP4/8 two lines format ephemerid model \"\n(InstantTrack, SatPC32 etc. )\nthe format is only a compress readable parameters\n \n \nThe moon:\n \nGiving Keplerian elements for the moon is much more difficult. The main\nproblem is that the moon's orbital plane has a fixed inclination\nwith reference to the ecliptic plane. The moon's orbital plane\nwobbles around there and turns once every 18.6 years.  Seen from the\nearth, that gives an changing inclination of about 18 to 28 degrees. The\ninclination of true earth satellites, on the other hand, remains\nfixed and the tracking program assumes that the inclination is not\nchanging. The only way to overcome that problem is to give sets of\n\"Keplerian elements\" every 50 to 100 days. In that period the change of\nthe inclination is not too big and the error stays small.\n \nA second problem with \"Keplerian elements\" for the moon is that the\nmoon's orbit is severely perturbed in a way a ordinary satellite\ntracking program cannot handle. Those perturbations come from the\nsun, the earth (not being a exact sphere) and from major planets. To\ncompute those perturbations exactly, we would need several hundred\ncorrective terms. For the accuracy needed here (1-3 degrees for the\nusual amateur satellite antenna), it has been sufficient to correct\nonly for the varying eccentricity. \n \n \n73, de Michael \n\n\n\n",
    "attachments": []
}