Chi Cassiopeiae (χ Cassiopeiae) is a solitary,[8] yellow-hued star in the constellation Cassiopeia. It is visible to the naked eye with an apparent visual magnitude of +4.7.[2] Based upon an annual parallax shift of 15.67 mas as seen from Earth,[1] this system is located roughly 208 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction of 0.18 due to interstellar dust.[4]

Chi Cassiopeiae

Map of the Bayer-designated stars in Cassiopeia. Chi Cassiopeiae is circled.
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)	+4.696[2]
Characteristics
Spectral type	G9 IIIb[3]
U−B color index	+0.762[2]
B−V color index	+0.997[2]
Astrometry
Radial velocity (Rv)	+6.66±0.14[4] km/s
Proper motion (μ)	RA: −43.03±0.34[1] mas/yr Dec.: −22.31±0.32[1] mas/yr
Parallax (π)	15.67 ± 0.39 mas[1]
Distance	208 ± 5 ly (64 ± 2 pc)
Absolute magnitude (MV)	+0.52[5]
Details[5]
Mass	2.04 M☉
Radius	11.0±0.8[3] R☉
Luminosity	67.6 L☉
Surface gravity (log g)	2.21 cgs
Temperature	4,746 K
Metallicity [Fe/H]	−0.34 dex
Rotational velocity (v sin i)	0.44±0.45[6] km/s
Age	1.0 Gyr
Other designations
χ Cas, 39 Cas, BD+58° 260, HD 9408, HIP 7294, HR 442, SAO 22397[7]
Database references
SIMBAD	data

With a stellar classification of G9 IIIb,[3] it has the spectrum of an evolved, G-type giant star. It has an estimated age of a billion years[5] and is a red clump star that it is generating energy through helium fusion at its core.[9] The star has about double[5] the mass of the Sun and has expanded to 11[3] times the Sun's radius. It is radiating 67.6 times the Sun's luminosity from its photosphere at an effective temperature of 4,746 K.[5]

References