XTE J1650−500
X-ray binary star in the constellation Ara
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XTE J1650−500 is a binary system containing a stellar-mass black hole candidate and 2000–2001 transient binary X-ray source located in the constellation Ara. In 2008, it was claimed that this black hole had a mass of 3.8±0.5 solar masses,[4] which would have been the smallest found for any black hole; smaller than GRO 1655−40, the then known smallest of 6.3 M☉.[5] However, this claim was subsequently retracted;[3] the more likely mass is 5–10 solar masses.
Artist's impression of XTE J1650−500 | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Ara[1] |
| Right ascension | 16h 50m 00.98s[2] |
| Declination | −49° 57′ 43.6″[2] |
| Characteristics | |
| Spectral type | K2V[2] |
| Astrometry | |
| Distance | 3300±700[3] pc |
| Details | |
| Black hole | |
| Mass | 9.7±1.6[3] M☉ |
| Other designations | |
| INTREF 720 | |
| Database references | |
| SIMBAD | data |
The binary period of the black hole and its companion is 0.32 days.[6]
