High Quality Content by WIKIPEDIA articles! XTE J1739-285 is a neutron star, or possibly a strange star in the constellation Ophiuchus, situated approximately 39,000 light-years from Earth. It was first observed on 19 October 1999 by NASA's Rossi X-ray Timing Explorer satellite. As as 2007 March 10, XTE J1739-285 is the fastest-spinning celestial body yet known, with a period of 1,122 Hz (approximately 67,320 RPM). The previous record-holder, a neutron star designated as PSR J1748-2446ad, has a period of 716 Hz (approximately 42,960 RPM). A neutron star is a type of remnant that can result from the gravitational collapse of a massive star during a Type II, Type Ib or Type Ic supernova event. Such stars are composed almost entirely of neutrons, which are subatomic particles without electrical charge and roughly the same mass as protons.

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