# 23 Comae Berenices

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Binary star system in the constellation Coma Berenices

23 Comae Berenices 23 Comae Berenices (circled) in the constellation Coma Berenices Observation data Epoch J2000 Equinox J2000 Constellation Coma Berenices Right ascension 12h 34m 51.08058s[1] Declination +22° 37′ 45.3303″[1] Apparent magnitude (V) 4.80[2] (4.96 + 6.90)[3] Characteristics Spectral type A0IV[4] U−B color index −0.01[5] B−V color index +0.012±0.015[2] Astrometry Radial velocity (Rv) −16.0±1.8[6] km/s Proper motion (μ) RA: −58.89[1] mas/yr Dec.: 28.31[1] mas/yr Parallax (π) 10.52±0.52 mas[1] Distance 310 ± 20 ly (95 ± 5 pc) Absolute magnitude (MV) −0.08[2] Orbit[7] 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[8] M☉ Radius 3.0[9] R☉ Luminosity 104.00[2] L☉ Surface gravity (log g) 3.85[8] cgs Temperature 9,675±329[8] K Rotational velocity (v sin i) 40[8] km/s Age 210[8] Myr Other designations Phyllon Kissinou, 23 Com, BD+23°2475, FK5 1323, GC 17142, HD 109485, HIP 61394, HR 4789, SAO 82390, WDS J12349+2238[10] Database references SIMBAD data

**23 Comae Berenices**, also named **Phyllon Kissinou**,[11] is a [binary star](/source/Binary_star)[7] system in the northern [constellation](/source/Constellation) of [Coma Berenices](/source/Coma_Berenices), situated a few degrees away from the [North Galactic Pole](/source/North_Galactic_Pole).[12] It is visible to the naked eye as a faint, white-hued point of light with an [apparent visual magnitude](/source/Apparent_visual_magnitude) of 4.80.[2] The system is located around 310 [light years](/source/Light_year) away from the Sun, based on [parallax](/source/Stellar_parallax).[1] It is moving closer to the Earth with a heliocentric [radial velocity](/source/Radial_velocity) of −16 km/s.[6]

The components of this system orbit each other with a [period](/source/Orbital_period) of 33 years, a large [eccentricity](/source/Orbital_eccentricity) of 0.9, and an angular [semimajor axis](/source/Semimajor_axis) of 0.219[″](/source/Second_of_arc).[7] The primary, designated component A, is a magnitude 4.96[3] star with a [stellar classification](/source/Stellar_classification) of A0IV,[4] matching an [A-type](/source/A-type_star) [subgiant](/source/Subgiant_star) that has exhausted the supply of hydrogen at its [core](/source/Stellar_core) and is in the process of [evolving](/source/Stellar_evolution) into a [giant](/source/Giant_star). Bychkov et al. (2009) list it as an [Am star](/source/Am_star) with an average [field strength](/source/Stellar_magnetic_field) of 26×10−4 [T](/source/Tesla_(unit)).[13]

The primary is 210[8] million years old and is spinning with a [projected rotational velocity](/source/Projected_rotational_velocity) of 40 km/s.[8] It has 2.15[8] times the [mass of the Sun](/source/Mass_of_the_Sun) and about three[9] times the [Sun's radius](/source/Sun's_radius). The star is radiating 104[2] times the [luminosity of the Sun](/source/Luminosity_of_the_Sun) from its [photosphere](/source/Photosphere) at an [effective temperature](/source/Effective_temperature) of 9,675 K.[8]

In Ptolemy's *[Almagest](/source/Almagest)*, this star is described as "shaped like an [ivy](/source/Ivy) leaf" (φύλλοv κισσίνου, *phyllon kissinou*), presumably referring to the overall shape of the [Coma Star Cluster](/source/Coma_Star_Cluster).[14] Based on this, some modern sources have referred to it as Kissin (or Kissīn); this name has also been used for [21 Comae Berenices](/source/21_Comae_Berenices).[15] The [IAU Working Group on Star Names](/source/IAU_Working_Group_on_Star_Names) approved the name Phyllon Kissinou for this star on 16 May 2024 and it is now so entered in the IAU Catalog of Star Names;[11] since this is a binary system, the IAU has mentioned that the names Phyllon and Kissinou can be applied to the primary and secondary components, respectively.[16]

## References

1. ^ [***a***](#cite_ref-vanLeeuwen2007_1-0) [***b***](#cite_ref-vanLeeuwen2007_1-1) [***c***](#cite_ref-vanLeeuwen2007_1-2) [***d***](#cite_ref-vanLeeuwen2007_1-3) [***e***](#cite_ref-vanLeeuwen2007_1-4) [***f***](#cite_ref-vanLeeuwen2007_1-5) van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". *Astronomy and Astrophysics*. **474** (2): 653–664. [arXiv](/source/ArXiv_(identifier)):[0708.1752](https://arxiv.org/abs/0708.1752). [Bibcode](/source/Bibcode_(identifier)):[2007A&A...474..653V](https://ui.adsabs.harvard.edu/abs/2007A&A...474..653V). [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20078357](https://doi.org/10.1051%2F0004-6361%3A20078357). [S2CID](/source/S2CID_(identifier)) [18759600](https://api.semanticscholar.org/CorpusID:18759600).

1. ^ [***a***](#cite_ref-Anderson2012_2-0) [***b***](#cite_ref-Anderson2012_2-1) [***c***](#cite_ref-Anderson2012_2-2) [***d***](#cite_ref-Anderson2012_2-3) [***e***](#cite_ref-Anderson2012_2-4) [***f***](#cite_ref-Anderson2012_2-5) Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", *Astronomy Letters*, **38** (5): 331, [arXiv](/source/ArXiv_(identifier)):[1108.4971](https://arxiv.org/abs/1108.4971), [Bibcode](/source/Bibcode_(identifier)):[2012AstL...38..331A](https://ui.adsabs.harvard.edu/abs/2012AstL...38..331A), [doi](/source/Doi_(identifier)):[10.1134/S1063773712050015](https://doi.org/10.1134%2FS1063773712050015), [S2CID](/source/S2CID_(identifier)) [119257644](https://api.semanticscholar.org/CorpusID:119257644).

1. ^ [***a***](#cite_ref-Malkov2012_3-0) [***b***](#cite_ref-Malkov2012_3-1) Malkov, O. Yu.; Tamazian, V. S.; Docobo, J. A.; Chulkov, D. A. (2012). ["Dynamical Masses of a Selected Sample of Orbital Binaries"](https://doi.org/10.1051%2F0004-6361%2F201219774). *Astronomy and Astrophysics*. **546**: 5. [Bibcode](/source/Bibcode_(identifier)):[2012A&A...546A..69M](https://ui.adsabs.harvard.edu/abs/2012A&A...546A..69M). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201219774](https://doi.org/10.1051%2F0004-6361%2F201219774). A69.

1. ^ [***a***](#cite_ref-Cowley1969_4-0) [***b***](#cite_ref-Cowley1969_4-1) 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](/source/Bibcode_(identifier)):[1969AJ.....74..375C](https://ui.adsabs.harvard.edu/abs/1969AJ.....74..375C). [doi](/source/Doi_(identifier)):[10.1086/110819](https://doi.org/10.1086%2F110819).

1. **[^](#cite_ref-EgUBV_5-0)** Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". *Catalogue of Eggen's UBV Data*. [Bibcode](/source/Bibcode_(identifier)):[1986EgUBV........0M](https://ui.adsabs.harvard.edu/abs/1986EgUBV........0M).

1. ^ [***a***](#cite_ref-deBruijne2012_6-0) [***b***](#cite_ref-deBruijne2012_6-1) 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](/source/ArXiv_(identifier)):[1208.3048](https://arxiv.org/abs/1208.3048), [Bibcode](/source/Bibcode_(identifier)):[2012A&A...546A..61D](https://ui.adsabs.harvard.edu/abs/2012A&A...546A..61D), [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201219219](https://doi.org/10.1051%2F0004-6361%2F201219219), [S2CID](/source/S2CID_(identifier)) [59451347](https://api.semanticscholar.org/CorpusID:59451347), A61.

1. ^ [***a***](#cite_ref-Seymour2002_7-0) [***b***](#cite_ref-Seymour2002_7-1) [***c***](#cite_ref-Seymour2002_7-2) 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](/source/Bibcode_(identifier)):[2002AJ....123.1023S](https://ui.adsabs.harvard.edu/abs/2002AJ....123.1023S), [doi](/source/Doi_(identifier)):[10.1086/338441](https://doi.org/10.1086%2F338441), [S2CID](/source/S2CID_(identifier)) [122326479](https://api.semanticscholar.org/CorpusID:122326479).

1. ^ [***a***](#cite_ref-David2015_8-0) [***b***](#cite_ref-David2015_8-1) [***c***](#cite_ref-David2015_8-2) [***d***](#cite_ref-David2015_8-3) [***e***](#cite_ref-David2015_8-4) [***f***](#cite_ref-David2015_8-5) [***g***](#cite_ref-David2015_8-6) [***h***](#cite_ref-David2015_8-7) [***i***](#cite_ref-David2015_8-8) 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](/source/ArXiv_(identifier)):[1501.03154](https://arxiv.org/abs/1501.03154). [Bibcode](/source/Bibcode_(identifier)):[2015ApJ...804..146D](https://ui.adsabs.harvard.edu/abs/2015ApJ...804..146D). [doi](/source/Doi_(identifier)):[10.1088/0004-637X/804/2/146](https://doi.org/10.1088%2F0004-637X%2F804%2F2%2F146). [S2CID](/source/S2CID_(identifier)) [33401607](https://api.semanticscholar.org/CorpusID:33401607).

1. ^ [***a***](#cite_ref-cadars_9-0) [***b***](#cite_ref-cadars_9-1) 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](/source/ArXiv_(identifier)):[astro-ph/0012289](https://arxiv.org/abs/astro-ph/0012289). [Bibcode](/source/Bibcode_(identifier)):[2001A&A...367..521P](https://ui.adsabs.harvard.edu/abs/2001A&A...367..521P). [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20000451](https://doi.org/10.1051%2F0004-6361%3A20000451). [S2CID](/source/S2CID_(identifier)) [425754](https://api.semanticscholar.org/CorpusID:425754).

1. **[^](#cite_ref-SIMBAD_10-0)** ["23 Com"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=23+Com). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 8 September 2012.

1. ^ [***a***](#cite_ref-IAU-CSN-new_11-0) [***b***](#cite_ref-IAU-CSN-new_11-1) ["IAU Catalog of Star Names"](https://exopla.net/star-names/modern-iau-star-names/). Retrieved 22 February 2025.

1. **[^](#cite_ref-Straizys1989_12-0)** 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](/source/Bibcode_(identifier)):[1989VilOB..84...26S](https://ui.adsabs.harvard.edu/abs/1989VilOB..84...26S).

1. **[^](#cite_ref-bychkov2009_13-0)** 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](/source/Bibcode_(identifier)):[2009MNRAS.394.1338B](https://ui.adsabs.harvard.edu/abs/2009MNRAS.394.1338B), [doi](/source/Doi_(identifier)):[10.1111/j.1365-2966.2008.14227.x](https://doi.org/10.1111%2Fj.1365-2966.2008.14227.x), [S2CID](/source/S2CID_(identifier)) [120268049](https://api.semanticscholar.org/CorpusID:120268049).

1. **[^](#cite_ref-Ridpath_14-0)** [Ridpath, Ian](/source/Ian_Ridpath). ["Star Tales - Coma Berenices"](http://ianridpath.com/startales/comaberenices.html). Retrieved 1 August 2025.

1. **[^](#cite_ref-Allen1963_15-0)** Allen, Richard Hinckley (1963), [*Star Names: Their Lore and Meaning*](https://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Coma_Berenices*.html), Dover Publications Inc., p. 171, retrieved 2019-11-01.

1. **[^](#cite_ref-WGSNreport2024_16-0)** IAU Working Group on Star Names. [Annual Report 2024](https://exopla.net/wp-content/uploads/2025/04/2024_Annual-Report-WGSN_for2024.pdf) (PDF) (Report).

v t e Constellation of Coma Berenices List of stars in Coma Berenices Coma Berenices in Chinese astronomy Stars Bayer α (Diadem) β γ Flamsteed 7 11 12 13 14 16 17 21 23 (Phyllon Kissinou) 24 31 35 36 37 41 Variable FK GP IN LW HR 4668 HD 107146 108863 108874 110067 114762 b 115404 116029 Other 2MASS J12195156+3128497 KELT-6 WASP-56 WISE 1217+1626 Exoplanets HD 108874 b c KELT-6b Star clusters Coma Star Cluster Messier 53 NGC 4147 NGC 5053 Nebulae LoTr 5 Galaxies Messier 64 (Black Eye Galaxy) 85 88 91 98 99 100 NGC 4014 4015 4017 4053 4056 4060 4061 4065 4066 4070 4072 4074 4076 4084 4086 4089 4090 4091 4092 4093 4095 4098 4136 4146 4150 4162 4185 4189 4203 4211 4212 4213 4222 4237 4245 4253 4262 4274 4278 4293 4298 4302 4308 4310 4312 4314 4323 4328 4340 4359 4375 4383 4393 4394 4414 4419 4448 4450 4455 4459 4468 4473 4474 4475 4477 4479 4489 4494 4495 4498 4502 4506 4515 4516 4523 4525 4540 4555 4556 4558 4559 4561 4565 4571 4585 4595 4611 4614 4615 4633 4634 4651 4659 4670 4673 4676 (Mice Galaxies) 4689 4692 4710 4712 4725 4747 4839 4848 4860 4869 4871 4872 4873 4874 4875 4876 4881 4883 4886 4889 4892 4895 4907 4911 4919 4921 4944 5000 5004 5012 5032 5056 5172 Other 3C 275.1 3C 287 Arp 60 Coma Berenices Dragonfly 44 IC 755 (NGC 4019) IC 831 IC 860 IC 3505 IC 3528 IC 4040 IC 4051 IOK-1 IRAS F12032+1707 LEDA 83677 M85-HCC1 Malin 1 PGC 44691 PKS 1155+251 PKS 1222+216 VIRGOHI21 ZwCl 1305.4+2941 BCG Galaxy clusters Abell 1413 Coma I Coma Cluster Coma Supercluster M94 Group NGC 4065 Group NGC 4631 Group Astronomical events GRB 050509B iPTF14atg SN 1940B SN 1979C SN 2005ap SN 2006X SN 2020oi Category

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