XTE J1739-285 explained

XTE J1739−285 is a neutron star,^[1] in the constellation Ophiuchus, situated approximately 39,000 light-years from Earth. It was first observed on 19 October 1999 by NASA'sRossi 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.^[2] However, a re-analysis of these data by other astronomers has been unable to reproduce this result.^[3]

XTE J1739−285 has been proposed as a possible quark star, as well as 3C 58.

Notes and References

1. http://simbad.u-strasbg.fr/simbad/sim-id?protocol=html&Ident=XTE+J1739-285+&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id Low mass X-ray binary
2. https://iopscience.iop.org/article/10.1086/513270/fulltext/ Evidence of 1122 Hz X-Ray Burst Oscillations from the Neutron Star X-Ray Transient XTE J1739–285
3. See footnote 1 of 2008AIPC.1068...67C . The spin distribution of millisecond X-ray pulsars . American Institute of Physics Conference Series . 1068 . 67 . 2008. 0809.4031 . 10.1063/1.3031208 . Chakrabarty . D . Wijnands . Rudy . Altamirano . Diego . Soleri . Paolo . Degenaar . Nathalie . Rea . Nanda . Casella . Piergiorgio . Patruno . Alessandro . Linares . Manuel . 14585824 .