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NuSTAR

Spacecraft
NuSTAR is a NASA space-based X-ray telescope that uses a conical approximation to a Wolter telescope to focus high energy X-rays from astrophysical sources, especially for nuclear spectroscopy, and operates in the range of 3 to 79 keV. Wikipedia
Launch date: June 13, 2012 at 12:00 PM EDT
Cost: 180 million USD (2012)
Perigee altitude: 596.6 km (370.7 mi)
Bus: LEOStar-2
Collecting area: 9 keV: 847 cm2 (131.3 sq in); 78 keV: 60 cm2 (9.3 sq in)