Catalpa

Hakucho (also known as CORSA-b before launch; CORSA stands for Cosmic Radiation Satellite) was Japan's first X-ray astronomy satellite, developed by the Institute of Space and Aeronautical Science (then a division of the University of Tokyo). It was launched from the Kagoshima Space Center by the ISAS M-3C rocket on the M-3C-4 mission on February 21, 1979 ^[1] and reentered the atmosphere on April 15, 1985.^[2]

Hakucho was a replacement for the Cosmic Radiation Satellite (CORSA) satellite which failed to launch due to rocket failure on February 4, 1976.^[3]

• Discovery of soft X-ray transient Cen X-4 and Aql X-1
• Discovery of many burst sources
• Long-term monitoring of X-ray pulsar (e.g. Vela X-1)
• Discovery of 2 Hz variability in the Rapid Burster later named Quasi Period Oscillation.

• Timeline of artificial satellites and space probes

• isas.jaxa.jp
• heasarc.gsfc.nasa.gov