Epoch J2000 Equinox J2000
|Right ascension||17h 39m 53.95s|
|Declination||-28° 29' 46.8"'|
|U−B color index||?|
|B−V color index||?|
|Mass||1.51  M☉|
|Radius||10.9 km - 1.567E-9 R☉|
XTE J1739-285 is a neutron 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.
It had previously been claimed that XTE J1739-285 was the fastest-spinning celestial body yet known, with a frequency of 1122 Hz (approximately 67,320 RPM). However, a re-analysis of these data by other astronomers has been unable to reproduce this result.
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