12 Cassiopeiae

12 Cassiopeiae
Location of 12 Cassiopeiae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cassiopeia
Right ascension 00h 24m 47.5055s[1]
Declination +61° 49′ 51.808″[1]
Apparent magnitude (V) +5.377[2]
Characteristics
Spectral type B9III[3]
U−B color index −0.16[4]
B−V color index +0.00[4]
Astrometry
Radial velocity (Rv)−1.76±0.60[1] km/s
Proper motion (μ) RA: +14.126[1] mas/yr
Dec.: −2.715[1] mas/yr
Parallax (π)3.8102 ± 0.0612 mas[1]
Distance860 ± 10 ly
(262 ± 4 pc)
Absolute magnitude (MV)−1.27[5]
Details
Mass3.1[6] M☉
Radius5.7[7] R☉
Luminosity386[7] L☉
Surface gravity (log g)2.94[6] cgs
Temperature10,728[7] K
Metallicity [Fe/H]−0.96[6] dex
Rotational velocity (v sin i)155[8] km/s
Age257[9] Myr
Other designations
12 Cas, HR 93, HD 2011, BD+61°69, HIP 1960
Database references
SIMBADdata

12 Cassiopeiae (12 Cas) is a white giant in the constellation Cassiopeia, about 860 light years away. It has an apparent magnitude of 5.4, so it faintly visible to the naked eye.

The spectrum of 12 Cassiopeiae is classified as a B9-type giant. About three times as massive as the Sun and 386 times as luminous, it has expanded away from the main sequence after exhausting its core hydrogen. It now has a radius of 5.7 R☉ with an effective temperature of about 10,728 K, leading to a bolometric luminosity of 386 L☉.

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