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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/XMOWBE4BDE54GPGUNDA4GJFRGQHQHODA/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "XMOWBE4BDE54GPGUNDA4GJFRGQHQHODA",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/V3CEQODDPTNLWMYMA5IJQUMGSXADW22E/?format=api",
    "sender": {
        "address": "peter.guelzow (a) kourou.de",
        "mailman_id": "c1ef441a593c454695e682f65935fe93",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/c1ef441a593c454695e682f65935fe93/emails/?format=api"
    },
    "sender_name": "Peter Guelzow",
    "subject": "[amsat-bb] Re: Can we get them to fix AO-40 first then?",
    "date": "2009-10-15T10:11:16Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/2UI4GAMSKZMR7HGK23M7UZRLFXUNZ7VI/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/A2V7VBQCR2LK5FLFG62627RHBET5MHAZ/?format=api",
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/5DVIE4ZPPUVUKF7QY3EOZEL7TL65SFL4/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi Samudra et all,\n\nvery interesting article and links you've sent out.\nSo far, I did not heard about attempts to take photographs, at least not\nin the public.\nHowever, there is no reason to believe that the satellite disintegrated,\nsince there are now other objects tracked around it.\n\nThe command stations regularly sent commands to AO-40 in the last years,\nbut I guess with larger time between those attempts now.\nAO-40 was launched with the IHU \"hot\", that means:  After separation and\nrelease of the safety/separation switch, the 24V power for the\ntransmitter was switched ON and after some waiting time, the Beacon was\ncommanded ON by the IHU (integrated housekeeping unit).\nThe electronics were designed that way, if for example the IHU crashes,\nthe I/O ports will remain in their last state and the transmitter would\nbe kept on.\nHowever if there is a complete power loss (as we expect with the battery\nshortened), all Output ports will indeed reset to their default state,\nwhich is \"all off\"...\n(The BCR's default values normaly should still produce enough power)\nFor this reason, the command stations prepared a small boot-block for\nthe IHU to configure the BCR (battery charge regulator) and the\nTrasmitter status, for example S-band Beacon On.\nIf this would be successful, command stations could start to reload the\nIHU, etc..   \nWe also still plan to use our 20m dish in Bochum to uplink commands with\nhigh power or listen for some week signals.\n\n73s Peter DB2OS\n\n\n\nSamudra Haque wrote:\n> Has there been any serious attempt to take a photograph of the damaged\n> bird using ground based optical telescopes while it is in sunlight ?\n> With modern telescopes such as\n> http://www.refractortelescopes.co.uk/reviews/orion/orion-shorttube-80-a-refractor-telescope/\n> or similiar and a modern digital camera and a known RA/DEC co-ordinate\n> of the satellite at any point in its orbit, it should be possible get\n> a fairly decent picture of what is still up there...\n>\n> Note RA / DEC are astronomy co-ordinates which should be able to be\n> calculated from AZ/EL or TLE, but I may not be able to do it myself.\n>\n> We don't need to track it, but just to image it in several consecutive\n> frames. From: http://www.emergentspace.com/pubs/AIAA_GNC_2002_AMSAT_A040.pdf\n>\n> Table 1. Nominal Orbit Parameters for AO-40\n> Orbit Parameter Value\n> Semimajor Axis (km) 36,245\n> Perigee Height (km) 1,042\n> Apogee Height (km) 58,691\n> Eccentricity 0.797\n> Inclination (deg) 6.04\n> Period (hours) 19.1\n>\n>\n> On Wed, Oct 14, 2009 at 9:49 PM, Rocky Jones <[email protected]> wrote:\n>   \n>> I think both those things are accurate.\n>>\n>> Robert WB5MZO\n>>\n>>     \n>>> Date: Wed, 14 Oct 2009 21:31:30 -0400\n>>> From: [email protected]\n>>> To: [email protected]\n>>> Subject: [amsat-bb] Re: Can we get them to fix AO-40 first then?\n>>>\n>>> I guess I need to go back and read the archives because what I remember\n>>> reading didn't give me any hope AO-40 would ever be back. Wasn't there\n>>> something about that they believed the spacecraft was leaking corrosive\n>>> fuel? Doesn't sound to conducive to any type of recovery of anything\n>>> where electronics are involved.. I also thought there was talk of a\n>>> \"catastrophic explosion\".\n>>> Michael, W4HIJ\n>>> _______________________________________________\n>>> Sent via [email protected]. Opinions expressed are those of the author.\n>>> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n>>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n>>>       \n>> _________________________________________________________________\n>> Hotmail: Powerful Free email with security by Microsoft.\n>> http://clk.atdmt.com/GBL/go/171222986/direct/01/\n>> _______________________________________________\n>> Sent via [email protected]. Opinions expressed are those of the author.\n>> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n>>\n>>     \n> _______________________________________________\n> Sent via [email protected]. Opinions expressed are those of the author.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n>\n>   \n\n",
    "attachments": []
}