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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/PVQO5E5Y4ZQFLWURB5HYRHXI6ZEEBRQA/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "PVQO5E5Y4ZQFLWURB5HYRHXI6ZEEBRQA",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/PVQO5E5Y4ZQFLWURB5HYRHXI6ZEEBRQA/",
    "sender": {
        "address": "kf6kyi (a) gmail.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Mark VandeWettering",
    "subject": "[amsat-bb]  On imaging AO-40 from the HST or ISS...",
    "date": "2009-10-15T18:58:06Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "> Not that it's practical, but what could Hubble see?  The first question\n> would be can it be positioned to stare \"down\", and then how well\n> would it see something that close and fast?\n\nThe HST is actually pretty interesting.  It's in a 550 or so km orbit,\nwhich means that it's close approach to AO-40 would be about 500km.\nMore importantly, it has a 2.4m mirror, which works out to about 94\ninches.   In theory, it's maximum resolving power is about 0.05 arc\nseconds, which at 500km (ballpark of the closest range it could\nachieve) would be on the order of 5 inches.   I have no idea what the\ntracking requirements would be and whether it could image such an\nobject, but I have little doubt that there are military satellites\nwith that capability.\n\nThe JWST (scheduled to launch in... 2014 or so?) has an aperature in\nexcess of six meters, and would result in a corresponding increase in\nresolving power.\n\nThe ISS has a nominal orbit altitude of around 350km, so would be a\nmore challenging, and doesn't carry the kind of optical instruments\nthat the HST carries.\n\n73 Mark K6HX\n",
    "attachments": []
}