Nu Cassiopeiae
B-type star in the constellation Cassiopeia
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Nu Cassiopeiae is a solitary[13] 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,[3] 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,[2] 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.[8]
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cassiopeia[1] |
| Right ascension | 00h 43m 28.07045s[2] |
| Declination | +47° 01′ 28.3694″[2] |
| Apparent magnitude (V) | +4.89[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2][4] |
| Spectral type | B9 III[5] or B8 V[6] |
| U−B color index | −0.43[7] |
| B−V color index | −0.11[7] |
| Astrometry | |
| Radial velocity (Rv) | +9.0±4.2[8] km/s |
| Proper motion (μ) | RA: +29.453 mas/yr[2] Dec.: −8.152 mas/yr[2] |
| Parallax (π) | 9.1537±0.2122 mas[2] |
| Distance | 356 ± 8 ly (109 ± 3 pc) |
| Absolute magnitude (MV) | −0.60[1] |
| Details | |
| Mass | 3.6[9] M☉ |
| Radius | 2.8[9] R☉ |
| Luminosity | 194[9] L☉ |
| Surface gravity (log g) | 4.026±0.035[10] cgs |
| Temperature | 13,268±150[10] K |
| Rotational velocity (v sin i) | 134±17[10] km/s |
| Age | 197[11] Myr |
| Other designations | |
| ν Cas, 25 Cas, BD+50°147, HD 4636, HIP 3801, HR 223, SAO 21729[12] | |
| Database references | |
| SIMBAD | data |
Cowley et al. (1969) catalogued this star with a stellar classification of B9 III,[5] 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.[6]
