Beta Cassiopeiae
Beta Cassiopeiae (β Cassiopeiae, abbreviated Beta Cas or β Cas), officially named Caph /ˈkæf/, is a Delta Scuti variable star in the constellation of Cassiopeia. It is a giant star belonging to the spectral class F2. The white star of second magnitude (+2.28 mag, variable) has an absolute magnitude of +1.3 mag.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 00h 09m 10.68518s |
| Declination | +59° 08′ 59.2120″ |
| Apparent magnitude (V) | +2.28 (2.25–2.31) |
| Characteristics | |
| Spectral type | F2 III |
| U−B color index | 0.11 |
| B−V color index | 0.34 |
| Variable type | δ Sct |
| Astrometry | |
| Radial velocity (Rv) | 11.3 km/s |
| Proper motion (μ) | RA: +523.50 mas/yr Dec.: −179.77 mas/yr |
| Parallax (π) | 59.58 ± 0.38 mas |
| Distance | 54.7 ± 0.3 ly (16.8 ± 0.1 pc) |
| Absolute magnitude (MV) | +1.3 |
| Details | |
| Mass | 1.91 ± 0.02 M☉ |
| Radius | 3.43–3.69 R☉ |
| Luminosity | 27.3 L☉ |
| Surface gravity (log g) | 3.40 cgs |
| Temperature | 7,079 K |
| Metallicity [Fe/H] | 0.03 dex |
| Rotational velocity (v sin i) | 71.0 km/s |
| Age | 1.09–1.18 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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