| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Coma Berenices |
| Right ascension | 12 34 51.08058 |
| Declination | +22° 37′ 45.3303″ |
| Apparent magnitude (V) | 4.80 (4.96 + 6.90) |
| Characteristics | |
| Spectral type | A0IV |
| U−B color index | −0.01 |
| B−V color index | +0.012±0.015 |
| Astrometry | |
| Radial velocity (Rv) | −16.0±1.8 km/s |
| Proper motion (μ) | RA: −58.89 mas/yr Dec.: 28.31 mas/yr |
| Parallax (π) | 10.52 ± 0.52 mas |
| Distance | 310 ± 20 ly (95 ± 5 pc) |
| Absolute magnitude (MV) | −0.08 |
| Orbit | |
| Period (P) | 33.04 yr |
| Semi-major axis (a) | 0.219″ |
| Eccentricity (e) | 0.898 |
| Inclination (i) | 109.7° |
| Longitude of the node (Ω) | 24.3° |
| Periastron epoch (T) | B1964.62 |
| Argument of periastron (ω) (secondary) | 214.5° |
| Details | |
| Mass | 2.15 M☉ |
| Radius | 3.0 R☉ |
| Luminosity | 104.00 L☉ |
| Surface gravity (log g) | 3.85 cgs |
| Temperature | 9,675±329 K |
| Rotational velocity (v sin i) | 40 km/s |
| Age | 210 Myr |
| Other designations | |
| 23 Com, BD+23°2475, FK5 1323, GC 17142, HD 109485, HIP 61394, HR 4789, SAO 82390, WDS J12349+2238 | |
| Database references | |
| SIMBAD | data |
23 Comae Berenices is a binary star system in the northern constellation of Coma Berenices, situated a few degrees away from the North Galactic Pole. It is visible to the naked eye as a faint, white-hued point of light with an apparent visual magnitude of 4.80. The system is located around 310 light years away from the Sun, based on parallax. It is moving closer to the Earth with a heliocentric radial velocity of −16 km/s.
The components of this system orbit each other with a period of 33 years, a large eccentricity of 0.9, and an angular semimajor axis of 0.219″. The primary, designated component A, is a magnitude 4.96 star with a stellar classification of A0IV, matching an A-type subgiant that has exhausted the supply of hydrogen at its core and is in the process of evolving into a giant. Bychkov et al. (2009) list it as an Am star with an average field strength of 26×10 T.
The primary is 210 million years old and is spinning with a projected rotational velocity of 40 km/s. It has 2.15 times the mass of the Sun and about three times the Sun's radius. The star is radiating 104 times the luminosity of the Sun from its photosphere at an effective temperature of 9,675 K.
References
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- ^ 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, S2CID 119257644.
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- ^ Cowley, A.; Cowley, C.; Jaschek, M.; Jaschek, C. (April 1969). "A study of the bright A stars. I. A catalogue of spectral classifications". Astronomical Journal. 74: 375–406. Bibcode:1969AJ.....74..375C. doi:10.1086/110819.
- Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
- ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
- ^ Seymour, Diana M.; Mason, Brian D.; Hartkopf, William I.; Wycoff, Gary L. (February 2002), "Binary Star Orbits. II. Preliminary First Orbits for 117 Systems", The Astronomical Journal, 123 (2): 1023–1038, Bibcode:2002AJ....123.1023S, doi:10.1086/338441, S2CID 122326479.
- ^ David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv:1501.03154. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146. S2CID 33401607.
- ^ Pasinetti Fracassini, L. E.; et al. (February 2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)". Astronomy and Astrophysics. 367 (2) (Third ed.): 521–524. arXiv:astro-ph/0012289. Bibcode:2001A&A...367..521P. doi:10.1051/0004-6361:20000451. S2CID 425754.
- "23 Com". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 8 September 2012.
- Straizys, V.; Meistas, E. (1989). "Photoelectric photometry of bright stars in the vicinity of the North Galactic Pole". Vilnius Astronomijos Observatorijos Biuletenis. 84: 26. Bibcode:1989VilOB..84...26S.
- Bychkov, V. D.; et al. (2009), "Catalogue of averaged stellar effective magnetic fields - II. Re-discussion of chemically peculiar A and B stars", Monthly Notices of the Royal Astronomical Society, 394 (3): 1338, Bibcode:2009MNRAS.394.1338B, doi:10.1111/j.1365-2966.2008.14227.x, S2CID 120268049.
