RX J1856.5-3754 [SEP] constellation
RX J1856.5−3754
RX J1856.5−3754 (also called RX J185635−3754, RX J185635−375, and various other designations) is a nearby neutron star in the constellation Corona Australis.
Discovery and location.
RX J1856.5−3754 is thought to have formed in a supernova explosion of its companion star about one million years ago and is moving at 108 km/s across the sky. It was discovered in 1992, and observations in 1996 confirmed that it is a neutron star, the closest to Earth discovered.
It was originally thought to be
400 km/s) to the newly formed neutron star.
Some of the closest known neutron stars are RX J1856.5−3754, which is about 400 light-years from Earth, and PSR J0108−1431 at about 424 light years. RX J1856.5-3754 is a member of a close group of neutron stars called The Magnificent Seven. Another nearby neutron star that was detected transiting the backdrop of the constellation Ursa Minor has been nicknamed Calvera by its Canadian and American discoverers, after the villain in the 1960 film "The Magnificent Seven