Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Ophiuchus |
Right ascension | 17h 39m 53.95s |
Declination | −28° 29′ 46.8″ |
Characteristics | |
Spectral type | Q |
Variable type | None |
Astrometry | |
Distance | 39,000 Ly |
Details | |
Mass | 1.51[1] M☉ |
Radius | 10.9 km |
Other designations | |
SWIFT J1740.6−2821B | |
Database references | |
SIMBAD | data |
XTE J1739−285 is a neutron star,[2] 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.[3] However, a re-analysis of these data by other astronomers has been unable to reproduce this result.[4]
XTE J1739−285 has been proposed as a possible quark star, as well as 3C 58.