Uhuru

Uhuru (aka SAS 1 and SAS-A) was a space-based X-ray telescope launched by NASA in 1970 for a 3-year mission, surveying the sky at a 30-arcminute angular resolution, sensitive to about 1.5 × 10^-18joule/cm²/sec, covering a photon energy range of 2-20 keV. It was the first in a series of three 1970s NASA satellites called the Small Astronomical Satellite program.