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]
Map of the Bayer-designated stars in Cassiopeia. Chi Cassiopeiae is circled. | |
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
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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 | |
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]
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