Nu Cassiopeiae
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 00h 43m 28.07045s |
| Declination | +47° 01′ 28.3694″ |
| Apparent magnitude (V) | +4.89 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | B9 III or B8 V |
| U−B color index | −0.43 |
| B−V color index | −0.11 |
| Astrometry | |
| Radial velocity (Rv) | +9.0±4.2 km/s |
| Proper motion (μ) | RA: +29.453 mas/yr Dec.: −8.152 mas/yr |
| Parallax (π) | 9.1537±0.2122 mas |
| Distance | 356 ± 8 ly (109 ± 3 pc) |
| Absolute magnitude (MV) | −0.60 |
| Details | |
| Mass | 3.6 M☉ |
| Radius | 2.8 R☉ |
| Luminosity | 194 L☉ |
| Surface gravity (log g) | 4.026±0.035 cgs |
| Temperature | 13,268±150 K |
| Rotational velocity (v sin i) | 134±17 km/s |
| Age | 197 Myr |
| Other designations | |
| ν Cas, 25 Cas, BD+50°147, HD 4636, HIP 3801, HR 223, SAO 21729 | |
| Database references | |
| SIMBAD | data |
Nu Cassiopeiae is a solitary star in the northern constellation of Cassiopeia. Its name is a Bayer designation that is Latinized from ν Cassiopeiae, and abbreviated Nu Cas or ν Cas. With an apparent visual magnitude of +4.89, it is a faint star but visible to the naked eye. Based upon an annual parallax shift of 9.15 mas as seen from Earth, this star is located around 356 light-years (109 pc) from the Sun. It is drifting further away with a line of sight velocity component of roughly +9 km/s.
Cowley et al. (1969) catalogued this star with a stellar classification of B9 III, indicating it has the spectrum of an evolved B-type giant star. However, Palmer et al. (1968) assigned it a class of B8 V, which would instead suggest it is an ordinary B-type main-sequence star.