Uhuru was launched on 12 December 1970 into an orbit of 560 km apogee, 520 km perigee, 3 degrees inclination, with a period of 96 minutes. It had a spin period of ~12 minutes and provided a comprehensive view of the entire sky with a sensitivity of about 0.001 times the intensity of the Crab nebula. 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 X 10-11 ergs/cm2/sec, 5 X 10-4 the flux from the Crab Nebula; to determine discrete source locations with a precision of a few square minutes of arc for strong sources and a few tenths of a square degree at the sensitivity limit; to study the structure of extended sources or complex regions with a resolution of about 30 arc minutes; to determine gross spectral features and variability of X-ray sources; and, wherever possible, to perform coordinated and/or simultaneous observations of X-ray objects with other observers.
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Last modified: Wednesday, 08-Oct-2003 19:04:09 EDT
The HEASARC is hiring! - Applications are now being accepted for a scientist with significant experience and interest in the technical aspects of astrophysics research, to work in the HEASARC at NASA Goddard Space Flight Center (GSFC) in Greenbelt, MD. Refer to the AAS Job register for full details.