12 Cassiopeiae
Star in the constellation Cassiopeia
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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.
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cassiopeia[1] |
| Right ascension | 00h 24m 47.5055s[2] |
| Declination | +61° 49â² 51.808â³[2] |
| Apparent magnitude (V) | +5.377[3] |
| Characteristics | |
| Spectral type | B9III[4] |
| UâB color index | â0.16[5] |
| BâV color index | +0.00[5] |
| Astrometry | |
| Radial velocity (Rv) | â1.76±0.60[2] km/s |
| Proper motion (μ) | RA: +14.126[2] mas/yr Dec.: â2.715[2] mas/yr |
| Parallax (Ï) | 3.8102±0.0612 mas[2] |
| Distance | 860 ± 10 ly (262 ± 4 pc) |
| Absolute magnitude (MV) | â1.27[1] |
| Details | |
| Mass | 3.1[6] Mâ |
| Radius | 5.7[7] Râ |
| Luminosity | 386[7] Lâ |
| Surface gravity (log g) | 2.94[6] cgs |
| Temperature | 10,728[7] K |
| Metallicity [Fe/H] | â0.96[6] dex |
| Rotational velocity (v sin i) | 155[8] km/s |
| Age | 257[9] Myr |
| Other designations | |
| 12 Cas, HR 93, HD 2011, BD+61°69, HIP 1960 | |
| Database references | |
| SIMBAD | data |
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 Râ with an effective temperature of about 10,728 K, leading to a bolometric luminosity of 386 Lâ.