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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/H5BKKSKCCRBIRQ6VZOKIJLQE6WPST5KG/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "H5BKKSKCCRBIRQ6VZOKIJLQE6WPST5KG",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/H5BKKSKCCRBIRQ6VZOKIJLQE6WPST5KG/",
    "sender": {
        "address": "g7hia (a) btinternet.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "John Heath",
    "subject": "[amsat-bb]  Cute competition winners",
    "date": "2009-10-28T17:31:01Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Cute Re-entry Competition\n \nWinners Declared\n \nIt seems that when a satellites,  reache an altitude as low as about 170km they will be down very quickly. According to Space Track elements, and InstanTrak tracking software Cute was still orbiting when the perigee was below 150 Km.\n \nMy theory is that cubesats stay in orbit longer because they have a large mass relative to their very small cross section and so experience far drag than bulkier objects.\n \nUsing that idea I ran the last element set for several orbits and made an arbitrary decision that re-entry probably took place at a perigee of 130Km or so thus putting re-entry pretty much dead centre between two competition entries.\n \nI therefore declare Ib OZ1MY and David G0MRF as joint winners !!!\n \nOn receipt of current postal addresses I will mail out a patch kit to each of the lucky winners.\n \nThanks to Ib, David and everyone else who took part, it was fun to plot the curves and I learned a bit about atmospheric density and solar flux.\n \n73 John G7HIA\n \nPS \nIPS Radio and Space Services, have a useful paper on satellite orbital decay calculations. \nThanks to Ken GW1FKY for sending me a copy.\n",
    "attachments": []
}