Chi Cassiopeiae
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cassiopeia[1] |
| Right ascension | 01h 33m 55.881s[2] |
| Declination | +59° 13′ 55.39″[2] |
| Apparent magnitude (V) | +4.696[3] |
| Characteristics | |
| Evolutionary stage | red clump[4] |
| Spectral type | G9 IIIb[5] |
| U−B color index | +0.762[3] |
| B−V color index | +0.997[3] |
| Astrometry | |
| Radial velocity (Rv) | +6.66±0.14[6] km/s |
| Proper motion (μ) | RA: −44.188 mas/yr[2] Dec.: −18.538 mas/yr[2] |
| Parallax (π) | 16.2553±0.095 mas[2] |
| Distance | 201 ± 1 ly (61.5 ± 0.4 pc) |
| Absolute magnitude (MV) | +0.52[7] |
| Details[7] | |
| Mass | 2.04 M☉ |
| Radius | 10.27±0.32[8] 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[9] km/s |
| Age | 1.0 Gyr |
| Other designations | |
| χ Cas, 39 Cas, BD+58°260, HD 9408, HIP 7294, HR 442, SAO 22397[10] | |
| Database references | |
| SIMBAD | data |
Chi Cassiopeiae is a solitary,[11] yellow-hued star in the constellation Cassiopeia. Its name is a Bayer designation that is Latinized from χ Cassiopeiae, and is abbreviated Chi Cas or χ Cas. This star is visible to the naked eye with an apparent visual magnitude of +4.7.[3] Based upon an annual parallax shift of 16.26 mas as seen from Earth,[2] this system is located approximately 201 light-years (62 pc) from the Sun. At that distance, the visual magnitude is diminished by an extinction of 0.18 due to interstellar dust.[6]
With a stellar classification of G9 IIIb,[5] it has the spectrum of an evolved, G-type giant star. It is a red clump star that it is generating energy through helium fusion at its core,[4] with an estimated age of a billion years.[7] The star has about double the mass of the Sun[7] and has expanded to 10.3 times the Sun's radius.[8] It is radiating 67.6 times the Sun's luminosity from its photosphere at an effective temperature of 4,746 K.[7]
References
- ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
- ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023), "Gaia Data Release 3. Summary of the content and survey properties", Astronomy and Astrophysics, 674: A1, arXiv:2208.00211, Bibcode:2023A&A...674A...1G, doi:10.1051/0004-6361/202243940, S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c d Jennens, P. A.; Helfer, H. L. (September 1975), "A new photometric metal abundance and luminosity calibration for field G and K giants", Monthly Notices of the Royal Astronomical Society, 172 (3): 667–679, Bibcode:1975MNRAS.172..667J, doi:10.1093/mnras/172.3.667.
- ^ a b Valentini, M.; Munari, U. (November 2010), "A spectroscopic survey of faint, high-Galactic-latitude red clump stars. I. The high resolution sample", Astronomy and Astrophysics, 522: A79, arXiv:1007.0207, Bibcode:2010A&A...522A..79V, doi:10.1051/0004-6361/201014870, S2CID 119156545.
- ^ a b Nordgren, Tyler E.; et al. (December 1999), "Stellar Angular Diameters of Late-Type Giants and Supergiants Measured with the Navy Prototype Optical Interferometer", The Astronomical Journal, 118 (6): 3032–3038, Bibcode:1999AJ....118.3032N, doi:10.1086/301114.
- ^ a b Famaey, B.; et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430: 165–186, arXiv:astro-ph/0409579, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272, S2CID 17804304.
- ^ a b c d e Takeda, Yoichi; et al. (August 2008), "Stellar Parameters and Elemental Abundances of Late-G Giants", Publications of the Astronomical Society of Japan, 60 (4): 781–802, arXiv:0805.2434, Bibcode:2008PASJ...60..781T, doi:10.1093/pasj/60.4.781, S2CID 16258166.
- ^ a b Baines, Ellyn K.; et al. (2025-05-07), "Vintage NPOI: New and Updated Angular Diameters for 145 Stars", The Astronomical Journal, 169 (6): 293, arXiv:2506.02912, Bibcode:2025AJ....169..293B, doi:10.3847/1538-3881/adc930, ISSN 1538-3881.
- ^ Jofré, E.; et al. (2015), "Stellar parameters and chemical abundances of 223 evolved stars with and without planets", Astronomy & Astrophysics, 574: A50, arXiv:1410.6422, Bibcode:2015A&A...574A..50J, doi:10.1051/0004-6361/201424474, S2CID 53666931.
- ^ "chi Cas", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2017-08-30.
- ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.