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    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/SG5UTKZMEJX4PLJNEZH7UZRNPEZI7J3O/?format=api",
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    "message_id": "CA+qbou4ndttwZ6LSC-KCAKJi9=rVWp89oFtoayc-tqUzkAmCtg@mail.gmail.com",
    "message_id_hash": "SG5UTKZMEJX4PLJNEZH7UZRNPEZI7J3O",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/CBK45B7HYYFAQJ6KBVMIQNUEO6NWDOJ6/?format=api",
    "sender": {
        "address": "johnag9d (a) gmail.com",
        "mailman_id": "a458f56c7d8a4985a1449140c2b52908",
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    "sender_name": "John Spasojevich",
    "subject": "[amsat-bb] Re: AMSAT-DL and Bochum Observatory receive signal from retired NASA spacecraft",
    "date": "2014-03-09T16:58:21Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/CBK45B7HYYFAQJ6KBVMIQNUEO6NWDOJ6/?format=api",
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    "content": "Outstanding achievement!\n\nJohn - AG9D\n\n\nOn Sun, Mar 9, 2014 at 8:17 AM, Peter Guelzow <[email protected]>wrote:\n\n>\n>\n> see also:\n>\n> http://www.amsat-dl.org/index.php/news-mainmenu-97/199-ice-satellite-received-in-bochum\n>\n> ---------------------\n>\n> AMSAT-DL and Bochum Observatory receive signal from retired NASA spacecraft\n>\n> On March 1st and 2nd, 2014 radio amateurs were able to detect the beacon\n> signal from the retired NASA deep space probe ICE (International\n> Cometary Explorer) at the Bochum Observatory (Germany). After some\n> changes to the ground equipment and aligning the receive antenna to the\n> predicted position in the sky, the beacon signal could positively be\n> identified due to its frequency, the position in the sky and the\n> frequency shift due to the radial velocity (Doppler shift).\n>\n> For this detection the 20m radio telescope from the Bochum Observatory\n> was used. In 2003, AMSAT-DL converted this former industrial monument\n> into a fully functional groundstation for deep space probes. Since 2009\n> the facility is being used by volunteers almost full time as ground\n> receive station for data from the STEREO mission with its two\n> spaceprobes monitoring the sun from different viewing angles.\n>\n> The International Sun-Earth Explorer 3 (ISEE-3) was launched in 1978 and\n> became the first spacecraft to orbit the Earth-Sun L1 Lagrange point,\n> measuring the interaction between the Earth's magnetic field and the\n> Sun. It was the first spacecraft to detect the stream of particles\n> (\"solar wind\") approaching Earth. In 1982, the spacecraft was renamed\n> the \"International Cometary Explorer\" (ICE) and diverted to the Moon,\n> where its gravitational pull placed ICE on a heliocentric orbit. In\n> 1985, the comet Giacobini-Zinner was visited (the first time a comet had\n> been encountered by a spacecraft), followed by observation of Halley's\n> Comet in 1986. While the instrumentation on board was still functional\n> and fuel for more trajectory maneuvers was available, support for the\n> ICE mission was terminated in 1997, though the spacecraft transmitter\n> was left on. It was last detected by the NASA Deep Space Network in\n> 2008. Its orbit however results in the spacecraft returning to\n> Earth-Moon space in August of 2014. A small propulsive maneuver and\n> lunar flyby could allow ICE to be directed into an Earth-Sun L1 halo\n> orbit and perhaps resume a science mission, depending on instrument\n> health. However in February 2014 a NASA study determined that the\n> required resources to contact the spacecraft were not available anymore\n> and due to budgetary constraints no further contact attempts were\n> planned. In light of the recent observations and the available\n> facilities in Bochum, additional studies about the economic feasibility\n> to add a suitable uplink are being done.\n>\n> We would like to thank Jeremy Bauman from KinetX Aerospace (Tempe AZ,\n> USA) for providing the ICE trajectory solution which was essential in\n> finding the spacecraft and Jon D. Giorgini from the Jet Propulsion\n> Laboratory (Pasadena CA, USA) for his support.\n>\n>\n>\n> About AMSAT-DL:\n>\n> AMSAT-DL (short for AMSAT-Germany) is an organization consisting of\n> engineers, scientists, students, radio amateur operators and space\n> enthusiasts. They design, develop, build, operate and use satellites in\n> their spare time. In addition to ca. 600 members of AMSAT-DL other\n> national AMSAT organizations count in total about 6000 members. AMSAT-DL\n> is one of the few space organizations which lead satellite projects from\n> the drawing board through design stage and construction into the\n> operative service. AMSAT-DL projects strictly follow the open-source\n> principle so technologies and procedures can be used by third parties.\n> This includes also lessons learned and scientific results obtained\n> during the satellite's operation.\n>\n> About the Bochum Observatory:\n>\n> The Bochum Observatory is a recognized and sponsored higher-education\n> institution of the state Nordrhein-Westfalen (Germany) and is also\n> funded by the 'Landeszentrale für politische Bildung NRW'. Next to\n> optical sky surveys the focus of the current work is the recording of\n> earth monitoring data from satellites. The main task is the scientific\n> analysis and the public presentation of this data to understand the\n> function of the 'earth system' and to characterize the effects and risks\n> of human actions in the context of globalization.\n>\n>\n>\n> contact AMSAT-DL: Dr. Achim Vollhardt, [email protected]\n>\n> contact Sternwarte Bochum: Thilo Elsner, [email protected]\n> <mailto:[email protected]>, +49 177 50 70 797\n>\n>\n>\n> ---\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",
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