Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Cassiopeia |
Right ascension | 01h 25m 56.02238s[1] |
Declination | +68° 07′ 48.0460″[1] |
Apparent magnitude (V) | +4.72[2] |
Characteristics | |
Spectral type | K0 III-IIIb CN0.5[3] |
U−B color index | +0.94 |
B−V color index | +1.051[4] |
Astrometry | |
Radial velocity (Rv) | −12.7±0.3[2] km/s |
Proper motion (μ) | RA: +75.50±0.18[1] mas/yr Dec.: +26.93±0.16[1] mas/yr |
Parallax (π) | 16.72 ± 0.18 mas[1] |
Distance | 195 ± 2 ly (59.8 ± 0.6 pc) |
Absolute magnitude (MV) | 0.869[4] |
Details | |
ψ Cas A | |
Radius | 12[5] R☉ |
Luminosity | 50[6] L☉ |
Surface gravity (log g) | 2.74[7] cgs |
Temperature | 4,952[6] K |
Metallicity [Fe/H] | −0.13[7] dex |
Other designations | |
Database references | |
SIMBAD | data |
Psi Cassiopeiae (ψ Cassiopeiae) is a binary star[9] 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;[10][11] it is a double star, designated CCDM J01259+6808AB,[12] 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,[10] which is itself another double;[10][13] CD comprises a 9.4 magnitude component C and a 10 magnitude component D.[14]