BB Doradus
Cataclysmic variable star in the constellation Dorado
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BB Doradus or BB Dor is a cataclysmic variable, a pre-nova star, thus a close pair binary star system. It is composed of a red dwarf and a white dwarf.[4] Observations of the white dwarf's faint but certain accretion disk are consistent with it being at ~10° inclination (to the line of sight from the Earth).[5]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Dorado |
| Right ascension | 05h 29m 28.66s |
| Declination | −58° 54′ 46.7″ |
| Apparent magnitude (V) | 14.3-19.3 |
| Characteristics | |
| Spectral type | WD + M3-4V |
| Variable type | SW Sex[2] |
| Astrometry | |
| Parallax (π) | 1.0871±0.0263 mas |
| Distance | 3,000 ± 70 ly (920 ± 20 pc) |
| Absolute magnitude (MV) | 15.52[3] |
| Details | |
| Temperature | 9365 K |
| Other designations | |
| BB Dor, GSC 08530-00528, AAVSO 0528-58, EC 05287-5857, 1RXS J0529-5854. | |
| Database references | |
| SIMBAD | data |
Its parallax (movement against background stars due to the Earth's orbit around the Sun) given by the Gaia space observatory's second data release puts the pair at about 3,000 light years away.[6]