Datei:Thor Delta-1A small.gif
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Beschreibung
| Beschreibung |
English: The Thor-Delta rocket system became known as the TD satellites. TD-1A was successfully launched on 11 March 1972 from Vandenberg Air Force Base (12 March in Europe). It was put in a nearly circular polar sun-synchronous orbit, with apogee 545 km, perogee 533 km, and inclination 97.6 degrees. It was Europe's first 3-axis stabilized satellite, with one axis pointing to the Sun to within +/- 5 degrees. The optical axis was maintained perpendicular to the solar pointing axis and to the orbital plane. It scanned the entire celestial sphere every 6 months, with a great circle being scanned every satellite revolution. After about 2 months of operation, both of the satellite's tape recorders failed. A network of ground stations was put together so that real-time telemetry from the satellite was recorded for about 60% of the time. After 6 months in orbit, the satellite entered a period of regular eclipses as the satellite passed behind the Earth -- cutting off sunlight to the solar panels. The satellite was put into hibernation for 4 months, until the eclipse period passed, after which systems were turned back on and another 6 months of observations were made. TD-1A was primarily a UV mission however it carried both a cosmic X-ray and a gamma-ray detector. |
| Datum | |
| Quelle | NASA's Imagine the Universe! Goddard Spaceflight Center, TD-1A |
| Urheber | Dr. Alan Smale (Director), within the Astrophysics Science Division (ASD) at NASA's Goddard Space Flight Center. The Imagine Team Project Leader: Dr. Jim Lochner Curator:Meredith Gibb Responsible NASA Official:Phil Newman |
| Genehmigung (Weiternutzung dieser Datei) |
Images produced by NASA are usually free of copyright [...] |
The X-ray detector was a 100 cm2 proportional counter covering the energy range 3-30 keV. When switched on, the experiment caused abnormal readouts in the satellite's telemetry. Alas, it was switched off and remained that way.
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Diese Datei ist gemeinfrei (public domain), da sie von der NASA erstellt worden ist. Die NASA-Urheberrechtsrichtlinie besagt, dass „NASA-Material nicht durch Urheberrecht geschützt ist, wenn es nicht anders angegeben ist“. (NASA-Urheberrechtsrichtlinie-Seite oder JPL Image Use Policy). |  |
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| aktuell | 02:28, 21. Sep. 2009 | | 351 × 216 (44 KB) | wikimediacommons>Marshallsumter | {{Information |Description={{en|1=The Thor-Delta rocket system became known as the TD satellites. TD-1A was successfully launched on 11 March 1972 from Vandenberg Air Force Base (12 March in Europe). It was put in a nearly circular polar sun-synchronous o |
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