Beta Carinae

β Carinae
Location of β Carinae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Carina
Pronunciation /ˌmaɪəˈplæsɪdəs/[1]
Right ascension 09h 13m 11.97746s[2]
Declination −69° 43′ 01.9473″[2]
Apparent magnitude (V) 1.69[3]
Characteristics
Spectral type A1III[4]
U−B color index +0.03[5]
B−V color index +0.00[5]
Astrometry
Radial velocity (Rv)−5.2[6] km/s
Proper motion (μ) RA: −156.47[2] mas/yr
Dec.: +108.95[2] mas/yr
Parallax (π)28.82 ± 0.11 mas[2]
Distance113.2 ± 0.4 ly
(34.7 ± 0.1 pc)
Absolute magnitude (MV)−1.03[7]
Details
Mass3.88[8] M☉
Radius5.82[9] R☉
Luminosity223[9] L☉
Surface gravity (log g)3.50[10] cgs
Temperature9,150±240[10] K
Metallicity [Fe/H]−0.36[4] dex
Rotational velocity (v sin i)145.7±2.2[11] km/s
Age260[12][8] Myr
Other designations
Miaplacidus, CD−69 600, FK5 348, HD 80007, HIP 45238, HR 3685, SAO 250495[13]
Database references
SIMBADdata

Beta Carinae is the second-brightest star in the southern constellation of Carina. It has the official name Miaplacidus;[14] 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 1.69,[3] 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.[2]

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