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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/ZE5GD4252TKWNVZY4U2IZCFDVXXUHCFY/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "ZE5GD4252TKWNVZY4U2IZCFDVXXUHCFY",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/ZE5GD4252TKWNVZY4U2IZCFDVXXUHCFY/?format=api",
    "sender": {
        "address": "twdeckard (a) earthlink.net",
        "mailman_id": "7ce245bfe53e49ee99247feaa165c0b9",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/7ce245bfe53e49ee99247feaa165c0b9/emails/?format=api"
    },
    "sender_name": "Todd W Deckard",
    "subject": "Re: [amsat-bb] when are TLE's too old to use?",
    "date": "2018-05-13T11:29:35Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "It’s my experience with my arduino based tracker that the TLEs age rapidly and must be refreshed on game day.   \n\nI attributed this to the single precision math although it could be due to some more fundamental misunderstanding on my part.\n\nNow that there are no more shuttle re-supply flights even ISS reboosts are fairly infrequent.\n\nI am using the most excellent  qrpTracker library (Bruce Robertson VE9QRP) which is in turn derived from PLAN13 (James Miller G3RUH). \n\nhttps://youtu.be/VG5L5oP2uNk\n\nhttps://github.com/twdeckard/AE-35/blob/master/sketch_ae-35/sketch_ae-35.ino\n\nBest\nTodd\n\n\nSent from my iPhone\n\n> On May 12, 2018, at 6:21 PM, Alfredos (fredy) Damkalis <[email protected]> wrote:\n> \n> Recently it was posted in libre.space community discourse[1] by cgbsat\n> an interesting analysis about TLE of a couple of satellites and what\n> delays you should expect in observation starting time when you use TLE\n> 0-10 days old.\n> \n> Delays vary depending on satellite, difference could be from some\n> seconds to some minutes (in ISS case).\n> \n> I'm very interested if there are similar analyses.\n> \n> 73,\n> fredy\n> \n> [1] https://community.libre.space/t/tle-updates-and-scheduling/1987/4\n> \n>> On 05/12/2018 08:02 PM, Ron VE8RT wrote:\n>> I understand that there won't be a good answer for how old can TLE's be\n>> before they're of no use.  If you were going to be offline for an\n>> extended period, roughly, for a LEO, how long would you go before\n>> they're worthless?\n>> \n>>   Ron VE8RT\n>> \n> \n",
    "attachments": []
}