Phi Cassiopeiae
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cassiopeia |
| A | |
| Right ascension | 01h 20m 04.916s |
| Declination | +58° 13′ 53.81″ |
| Apparent magnitude (V) | +5.11 |
| C | |
| Right ascension | 01h 19m 51.736s |
| Declination | +58° 11′ 29.32″ |
| Apparent magnitude (V) | +7.08 |
| Characteristics | |
| A | |
| Spectral type | F0Ia |
| U−B color index | +0.49 |
| B−V color index | +0.68 |
| C | |
| Spectral type | B6Ib |
| U−B color index | −0.37 |
| B−V color index | +0.41 |
| Astrometry | |
| A | |
| Radial velocity (Rv) | −28.39 km/s |
| Proper motion (μ) | RA: −1.479 mas/yr Dec.: −1.231 mas/yr |
| Parallax (π) | 0.2142±0.0838 mas |
| Distance | approx. 15,000 ly (approx. 5,000 pc) |
| Absolute magnitude (MV) | −8.76 |
| C | |
| Radial velocity (Rv) | −28.50 km/s |
| Proper motion (μ) | RA: −1.560 mas/yr Dec.: −0.809 mas/yr |
| Parallax (π) | 0.3679 ± 0.0169 mas |
| Distance | 8,900 ± 400 ly (2,700 ± 100 pc) |
| Absolute magnitude (MV) | −6.5 |
| Details | |
| A | |
| Mass | 6.3–17 M☉ |
| Radius | 263 R☉ |
| Luminosity | 170,000 L☉ |
| Surface gravity (log g) | 1.0 cgs |
| Temperature | 7,341 K |
| Metallicity | -0.24 |
| Rotational velocity (v sin i) | 23 km/s |
| Age | 20 Myr |
| C | |
| Mass | 21 M☉ |
| Radius | 53 R☉ |
| Luminosity | 83,000 L☉ |
| Surface gravity (log g) | 2.05 cgs |
| Temperature | 15,500 K |
| Rotational velocity (v sin i) | 35 km/s |
| Other designations | |
| 34 Cassiopeiae, HR 382, CCDM J01200+5813, ADS 1073 | |
| A: HD 7927, HIP 6242, BD+57°260, SAO 22191, GC 1594 | |
| C: HD 7902, HIP 6229, BD+57°257, SAO 22187, GC 1590, NSV 466 | |
| Database references | |
| SIMBAD | data |
Phi Cassiopeiae (φ Cas, φ Cassiopeiae) is a multiple star in the constellation Cassiopeia with a combined apparent magnitude of +4.95. The two brightest components are A and C, sometimes called φ1 and φ2 Cas. φ Cas A is an F0 bright supergiant of magnitude 4.95 and φ Cas C is a 7.08 magnitude B6 supergiant at 134".