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Hulse–Taylor pulsar

The Hulse–Taylor pulsar is a binary star system composed of a neutron star and a pulsar which orbit around their common center of mass. It is the first binary pulsar ever discovered. The pulsar was discovered by Russell Alan Hulse and Joseph... Wikipedia
Distance to Earth: 20,870 light years
Apparent magnitude (V): 22.5
Distance: 21,000 ly; (6,400 pc)
Mass: 1.441 M
Rotation: 59.02999792988 ms