Beta Carinae
Beta Carinae is the second-brightest star in the southern constellation of Carina. It has the official name Miaplacidus; Beta Carinae is the star's Bayer designation, which is Latinised from β Carinae and abbreviated Beta Car or β Car. With apparent magnitude of 1.68, it is one of the brightest stars in the night sky. It is the brightest star in the southern asterism known as the Diamond Cross, marking the southwestern end of the asterism. It lies near the planetary nebula IC 2448. Parallax measurements place it at a distance of 113.2 light-years (34.7 parsecs) from the Sun.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Carina |
| Pronunciation | /ˌmaɪəˈplæsɪdəs/ |
| Right ascension | 09h 13m 11.97746s |
| Declination | −69° 43′ 01.9473″ |
| Apparent magnitude (V) | 1.69 |
| Characteristics | |
| Spectral type | A1III |
| U−B color index | +0.03 |
| B−V color index | +0.00 |
| Astrometry | |
| Radial velocity (Rv) | −5.2 km/s |
| Proper motion (μ) | RA: −156.47 mas/yr Dec.: +108.95 mas/yr |
| Parallax (π) | 28.82 ± 0.11 mas |
| Distance | 113.2 ± 0.4 ly (34.7 ± 0.1 pc) |
| Absolute magnitude (MV) | −1.03 |
| Details | |
| Mass | 3.5 M☉ |
| Radius | 6.8 R☉ |
| Luminosity | 288 L☉ |
| Surface gravity (log g) | 3.16 cgs |
| Temperature | 8,866 K |
| Metallicity [Fe/H] | −0.36 dex |
| Rotational velocity (v sin i) | 145.7±2.2 km/s |
| Age | 260 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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