Zeta Cassiopeiae
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 00h 36m 58.28419s |
| Declination | +53° 53′ 48.8673″ |
| Apparent magnitude (V) | 3.59 to 3.68 |
| Characteristics | |
| Spectral type | B2IV |
| U−B color index | −0.89 |
| B−V color index | −0.19 |
| Variable type | SPB |
| Astrometry | |
| Radial velocity (Rv) | 2.0 km/s |
| Proper motion (μ) | RA: 17.38 mas/yr Dec.: −9.86 mas/yr |
| Parallax (π) | 5.50±0.16 mas |
| Distance | 590 ± 20 ly (182 ± 5 pc) |
| Absolute magnitude (MV) | −2.8 |
| Details | |
| Mass | 8.96±0.13 M☉ |
| Radius | 6.1±0.3 R☉ |
| Luminosity | 7,200±900 L☉ |
| Surface gravity (log g) | 3.81 cgs |
| Temperature | 21,500±800 K |
| Metallicity [Fe/H] | −0.23 dex |
| Rotation | 5.37045 days |
| Rotational velocity (v sin i) | 17±3 km/s |
| Age | 22.9±1.2 Myr |
| Other designations | |
| Fulu, ζ Cas, 17 Cassiopeiae, BD+53°105, FK5 17, GC 727, HD 3360, HIP 2920, HR 153, SAO 21566 | |
| Database references | |
| SIMBAD | data |
Zeta Cassiopeiae is a variable star in the constellation of Cassiopeia. It has the proper name Fulu, pronounced /ˈfuːluː/; Zeta Cassiopeiae is its Bayer designation, which is Latinized from ζ Cassiopeiae and abbreviated Zeta Cas or ζ Cas. This star has a blue-white hue and is classified as a B-type subgiant with a variable apparent magnitude of about +3.6, making it visible to the naked eye. Based upon parallax measurements, it is approximately 590 light-years from the Sun.