BI 253
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Dorado |
| Right ascension | 05h 37m 34.461s |
| Declination | −69° 01′ 10.20″ |
| Apparent magnitude (V) | 13.76 |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | O2V-III(n)((f*)) |
| U−B color index | −1.02 |
| B−V color index | −0.13 |
| Astrometry | |
| Proper motion (μ) | RA: 2.3 mas/yr Dec.: 3.1 mas/yr |
| Distance | 164,000 ly (50,000 pc) |
| Absolute magnitude (MV) | −5.7 |
| Details | |
| Mass | 97.6 M☉ |
| Radius | 10.9+1.7 −1.6 R☉ |
| Luminosity | 1,200,000+210,000 −370,000 L☉ |
| Surface gravity (log g) | 4.36+0.12 −0.33 cgs |
| Temperature | 58,000+1,600 −5,500 K |
| Rotational velocity (v sin i) | 153±24 km/s |
| Age | 0.4+0.8 −0.4 Myr |
| Other designations | |
| BI 253, VFTS 72, 2MASS J05373446-6901102, IRSF J05373446-6901102 | |
| Database references | |
| SIMBAD | data |
BI 253 is an O2V star in the Large Magellanic Cloud and is a primary standard of the O2 type. It is one of the hottest main-sequence stars known and one of the most-massive and most-luminous stars known.