BI 253
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Dorado |
| Right ascension | 05h 37m 34.46s |
| Declination | −69° 01' 10.2" |
| Apparent magnitude (V) | 13.88 |
| Characteristics | |
| Spectral type | O2V((f*)) |
| U−B color index | −1.02 |
| B−V color index | −0.13 |
| Other designations | |
BI 253, 2MASS J05373446-6901102 | |
| Database references | |
| SIMBAD | data |
BI 253 is an O-type main sequence star in the Large Magellanic Cloud, with one of the earliest spectra known. It is classified as spectral type O2V((f*)) and was cited in the article introducing the O2 star type, and is a primary standard of the type.[1][2] The star is classified as a runaway star, with relative motion detected spectrographically in excess of 100 km/s (225,000 mph).
References
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