Small Astronomy Satellite (other)
Small Astronomy Satellite may refer to: * Uhuru (satellite), or Small Astronomy Satellite A (SAS-A) or SAS 1, launched 1970 * Small Astronomy Satellite 2, or SAS B or SAS 2, launched 1972 * Small Astronomy Satellite 3, or SAS C or SAS 3, launched 1975 {{disambiguation ...
[...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]  

Uhuru (satellite)
Uhuru was the first satellite launched specifically for the purpose of X-ray astronomy. It was also known as the X-ray Explorer Satellite, SAS-A (for Small Astronomy Satellite A, the first of the three-spacecraft SAS series), SAS 1, or Explorer 42. The NASA observatory was launched on 12 December 1970 into an initial orbit of about 560 km apogee, 520 km perigee, 3 degrees inclination, with a period of 96 minutes. The mission ended in March 1973. Uhuru was a scanning mission, with a spin period of ~12 minutes. It performed the first comprehensive survey of the entire sky for X-ray sources, with a sensitivity of about 0.001 times the intensity of the Crab nebula. Objectives The main objectives of the mission were: * To survey the sky for cosmic X-ray sources in the 2–20 keV range to a limiting sensitivity of 1.5 × 10−18 joule/(cm2-sec), 5 × 10−4 the flux from the Crab Nebula * To determine discrete source locations with a precision of a few square minutes of arc ...
[...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]