Psi Cassiopeiae
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 01h 33m 55.93s |
| Declination | +59° 13′ 55.5″ |
| Apparent magnitude (V) | +4.72 |
| Characteristics | |
| Evolutionary stage | red clump |
| Spectral type | K0 III-IIIb CN0.5 |
| U−B color index | +0.94 |
| B−V color index | +1.051 |
| Astrometry | |
| Radial velocity (Rv) | −12.7±0.3 km/s |
| Proper motion (μ) | RA: +75.50±0.18 mas/yr Dec.: +26.93±0.16 mas/yr |
| Parallax (π) | 16.72±0.18 mas |
| Distance | 195 ± 2 ly (59.8 ± 0.6 pc) |
| Absolute magnitude (MV) | 0.869 |
| Details | |
| ψ Cas A | |
| Mass | 2.5 M☉ |
| Radius | 11 R☉ |
| Luminosity | 44 L☉ |
| Surface gravity (log g) | 2.74 cgs |
| Temperature | 4,442 K |
| Metallicity [Fe/H] | −0.13 dex |
| Age | 5.2 Gyr |
| Other designations | |
| ψ Cas, 36 Cas, BD+67°123, FK5 46, HD 8491, HIP 6692, HR 399, SAO 11751, ADS 1129, CCDM J01259+6808, WDS J01259+6808A | |
| Database references | |
| SIMBAD | data |
Psi Cassiopeiae (ψ Cassiopeiae) is a binary star system in the northern constellation of Cassiopeia.
The primary component, ψ Cassiopeiae A, is an orange K-type giant with an apparent magnitude of +5.0; it is a double star, designated CCDM J01259+6808AB, with a fourteenth magnitude star (component B) located 3 arcseconds from the primary. Located about 25 arcseconds distant there is a 9.8 magnitude optical companion CCDM J01259+6808CD, designated ψ Cassiopeiae B in older star catalogues, which is itself another double; CD comprises a 9.4 magnitude component C and a 10 magnitude component D.