Hakucho
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Hakucho (also known as CORSA-b before launch) was the Japan's first X-ray astronomy satellite developed by Institute of Space and Aeronautical Science (then a division of University of Tokyo). It was launched by M-3C-4 rocket on February 21, 1979 and reentered to atmosphere on April 16, 1985.
It was a replacement of CORSA satellite which failed to launch for a rocket failure on February 4, 1976.