# 13 Comae Berenices

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Star system in the constellation Coma Berenices

13 Comae Berenices Observation data Epoch J2000.0 Equinox J2000.0 Constellation Coma Berenices Right ascension 12h 24m 18.54890s[1] Declination +26° 05′ 54.9214″[1] Apparent magnitude (V) 5.15 – 5.18[2] Characteristics Evolutionary stage main sequence[1] Spectral type A3 V[3][4] B−V color index 0.082±0.003[4] Variable type α2 CVn[2] Astrometry Radial velocity (Rv) +0.1±0.1[5] km/s Proper motion (μ) RA: −26.158[1] mas/yr Dec.: −9.385[1] mas/yr Parallax (π) 11.1318±0.1589 mas[1] Distance 293 ± 4 ly (90 ± 1 pc) Absolute magnitude (MV) 0.38[4] Orbit[6] Period (P) 27.25±1.76 yr Semi-major axis (a) 0.170±0.012″ Eccentricity (e) 0.868±0.021 Inclination (i) 32.3±7.3° Longitude of the node (Ω) 164.0±8.2° Periastron epoch (T) 2017.80±0.11 Argument of periastron (ω) (secondary) 275.1±7.1° Details Mass 2.83[7] M☉ Radius 3.37[8] R☉ Luminosity 55[8] L☉ Surface gravity (log g) 3.84±0.14[7] cgs Temperature 8,846±301[7] K Metallicity [Fe/H] 0.24[4] dex Rotation 29.5 days[9] Rotational velocity (v sin i) 48[7] km/s Age 429[7] Myr Other designations 13 Com, GN Com, BD+26° 2344, HD 107966, HIP 60514, HR 4717, SAO 82291[10] Database references SIMBAD data

**13 Comae Berenices** is a [binary star](/source/Binary_star)[3] system in the northern [constellation](/source/Constellation) of [Coma Berenices](/source/Coma_Berenices). It has an [apparent visual magnitude](/source/Apparent_visual_magnitude) of 5.2, which is bright enough to be faintly visible to the [naked eye](/source/Naked_eye). With an annual [parallax shift](/source/Stellar_parallax) of 11.1 [mas](/source/Milliarcsecond),[1] it is located around 293 [light years](/source/Light_year) from the Sun. It is member of the nearby [Coma Star Cluster](/source/Coma_Star_Cluster) (Melotte 111).[11]

The two stars of this system orbit with a period of 27.25 years and a large [eccentricity](/source/Orbital_eccentricity) of 0.868.[6] The primary is an [A-type main-sequence star](/source/A-type_main-sequence_star) with a [stellar classification](/source/Stellar_classification) of A3 V.[3] In 1965, Gerhard Jackisch discovered the star is a [variable star](/source/Variable_star).[12] It was given its [variable star designation](/source/Variable_star_designation), GN Comae Berenices, in 1975.[13] It is catalogued as an [Alpha2 Canum Venaticorum variable](/source/Alpha2_Canum_Venaticorum_variable).[14] Rensom (1990) listed it as a suspected [Am star](/source/Am_star).[15] The system is a source of [X-ray emission](/source/X-ray_astronomy), which may be coming from the companion.[16]

## References

1. ^ [***a***](#cite_ref-dr3_1-0) [***b***](#cite_ref-dr3_1-1) [***c***](#cite_ref-dr3_1-2) [***d***](#cite_ref-dr3_1-3) [***e***](#cite_ref-dr3_1-4) [***f***](#cite_ref-dr3_1-5) [***g***](#cite_ref-dr3_1-6) Vallenari, A.; et al. (Gaia collaboration) (2023). ["*Gaia* Data Release 3. Summary of the content and survey properties"](https://doi.org/10.1051%2F0004-6361%2F202243940). *Astronomy and Astrophysics*. **674**: A1. [arXiv](/source/ArXiv_(identifier)):[2208.00211](https://arxiv.org/abs/2208.00211). [Bibcode](/source/Bibcode_(identifier)):[2023A&A...674A...1G](https://ui.adsabs.harvard.edu/abs/2023A&A...674A...1G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202243940](https://doi.org/10.1051%2F0004-6361%2F202243940). [S2CID](/source/S2CID_(identifier)) [244398875](https://api.semanticscholar.org/CorpusID:244398875). [Gaia DR3 record for this source](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?-source=+I%2F355&-from=nav&-nav=cat%3AI%2F355%26tab%3A%7BI%2F355%2Fgaiadr3%7D%26key%3Asource%3D1355%2Fgaiadr3%26HTTPPRM%3A%26-out.add%3D.%26Source%3D%3D%3D4008444190824309376%26-go+%25%23Sesame%23%25%26) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-gcvs_2-0) [***b***](#cite_ref-gcvs_2-1) Samus', N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (2017). "General catalogue of variable stars: Version GCVS 5.1". *Astronomy Reports*. **61** (1): 80. [Bibcode](/source/Bibcode_(identifier)):[2017ARep...61...80S](https://ui.adsabs.harvard.edu/abs/2017ARep...61...80S). [doi](/source/Doi_(identifier)):[10.1134/S1063772917010085](https://doi.org/10.1134%2FS1063772917010085).

1. ^ [***a***](#cite_ref-Eggleton2008_3-0) [***b***](#cite_ref-Eggleton2008_3-1) [***c***](#cite_ref-Eggleton2008_3-2) Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", *[Monthly Notices of the Royal Astronomical Society](/source/Monthly_Notices_of_the_Royal_Astronomical_Society)*, **389** (2): 869–879, [arXiv](/source/ArXiv_(identifier)):[0806.2878](https://arxiv.org/abs/0806.2878), [Bibcode](/source/Bibcode_(identifier)):[2008MNRAS.389..869E](https://ui.adsabs.harvard.edu/abs/2008MNRAS.389..869E), [doi](/source/Doi_(identifier)):[10.1111/j.1365-2966.2008.13596.x](https://doi.org/10.1111%2Fj.1365-2966.2008.13596.x), [S2CID](/source/S2CID_(identifier)) [14878976](https://api.semanticscholar.org/CorpusID:14878976).

1. ^ [***a***](#cite_ref-Anderson2012_4-0) [***b***](#cite_ref-Anderson2012_4-1) [***c***](#cite_ref-Anderson2012_4-2) [***d***](#cite_ref-Anderson2012_4-3) 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. **[^](#cite_ref-deBruijne2012_5-0)** 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-Tokovinin2024_6-0) [***b***](#cite_ref-Tokovinin2024_6-1) Tokovinin, Andrei; Mason, Brian D.; Mendez, Rene A.; Costa, Edgardo (July 2024), "Speckle Interferometry at SOAR Telescope in 2023", *The Astronomical Journal*, **168** (1): 28, [Bibcode](/source/Bibcode_(identifier)):[2024AJ....168...28T](https://ui.adsabs.harvard.edu/abs/2024AJ....168...28T), [doi](/source/Doi_(identifier)):[10.3847/1538-3881/ad4d56](https://doi.org/10.3847%2F1538-3881%2Fad4d56), [ISSN](/source/ISSN_(identifier)) [0004-6256](https://search.worldcat.org/issn/0004-6256).

1. ^ [***a***](#cite_ref-David2015_7-0) [***b***](#cite_ref-David2015_7-1) [***c***](#cite_ref-David2015_7-2) [***d***](#cite_ref-David2015_7-3) [***e***](#cite_ref-David2015_7-4) 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-tic_8-0) [***b***](#cite_ref-tic_8-1) Stassun, Keivan G.; et al. (2019). ["The Revised TESS Input Catalog and Candidate Target List"](https://doi.org/10.3847%2F1538-3881%2Fab3467). *The Astronomical Journal*. **158** (4): 138. [arXiv](/source/ArXiv_(identifier)):[1905.10694](https://arxiv.org/abs/1905.10694). [Bibcode](/source/Bibcode_(identifier)):[2019AJ....158..138S](https://ui.adsabs.harvard.edu/abs/2019AJ....158..138S). [doi](/source/Doi_(identifier)):[10.3847/1538-3881/ab3467](https://doi.org/10.3847%2F1538-3881%2Fab3467).

1. **[^](#cite_ref-oelkers2018_9-0)** Oelkers, Ryan J.; Rodriguez, Joseph E.; Stassun, Keivan G.; Pepper, Joshua; Somers, Garrett; Kafka, Stella; Stevens, Daniel J.; Beatty, Thomas G.; Siverd, Robert J.; Lund, Michael B.; Kuhn, Rudolf B.; James, David; Gaudi, B. Scott (2018). ["Variability Properties of Four Million Sources in the TESS Input Catalog Observed with the Kilodegree Extremely Little Telescope Survey"](https://doi.org/10.3847%2F1538-3881%2Faa9bf4). *The Astronomical Journal*. **155** (1): 39. [arXiv](/source/ArXiv_(identifier)):[1711.03608](https://arxiv.org/abs/1711.03608). [Bibcode](/source/Bibcode_(identifier)):[2018AJ....155...39O](https://ui.adsabs.harvard.edu/abs/2018AJ....155...39O). [doi](/source/Doi_(identifier)):[10.3847/1538-3881/aa9bf4](https://doi.org/10.3847%2F1538-3881%2Faa9bf4).

1. **[^](#cite_ref-SIMBAD_10-0)** ["13 Com"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=13+Com). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 2018-02-17.

1. **[^](#cite_ref-Casewell2006_11-0)** Casewell, S. L.; et al. (January 2006), "New stellar members of the Coma Berenices open star cluster", *[Monthly Notices of the Royal Astronomical Society](/source/Monthly_Notices_of_the_Royal_Astronomical_Society)*, **365** (2): 447–453, [arXiv](/source/ArXiv_(identifier)):[astro-ph/0510133](https://arxiv.org/abs/astro-ph/0510133), [Bibcode](/source/Bibcode_(identifier)):[2006MNRAS.365..447C](https://ui.adsabs.harvard.edu/abs/2006MNRAS.365..447C), [doi](/source/Doi_(identifier)):[10.1111/j.1365-2966.2005.09689.x](https://doi.org/10.1111%2Fj.1365-2966.2005.09689.x), [S2CID](/source/S2CID_(identifier)) [17595520](https://api.semanticscholar.org/CorpusID:17595520).

1. **[^](#cite_ref-Jackisch1972_12-0)** Jackisch, G. (September 1972). "Über die Veränderlichkeit der Sterne des Spektraltyps A". *Astronomische Nachrichten*. **294** (1–2): 1–8. [Bibcode](/source/Bibcode_(identifier)):[1972AN....294....1J](https://ui.adsabs.harvard.edu/abs/1972AN....294....1J). [doi](/source/Doi_(identifier)):[10.1002/asna.19722940102](https://doi.org/10.1002%2Fasna.19722940102).

1. **[^](#cite_ref-Kukarkin1975_13-0)** Kukarkin, B. V.; Kholopov, P. N.; Kukarkina, N. P.; Perova, N. B. (January 1975), "60th Name-List of Variable Stars", *Information Bulletin on Variable Stars*, **961**: 1, [Bibcode](/source/Bibcode_(identifier)):[1975IBVS..961....1K](https://ui.adsabs.harvard.edu/abs/1975IBVS..961....1K).

1. **[^](#cite_ref-Hoffleit1982_14-0)** Hoffleit, D. (October 1982), "Variable stars in the General Catalogue of Trigonometric Parallaxes", *Bulletin d'Information du Centre de Données Stellaires*, **23**: 53, [Bibcode](/source/Bibcode_(identifier)):[1982BICDS..23...53H](https://ui.adsabs.harvard.edu/abs/1982BICDS..23...53H). See entry 2855.

1. **[^](#cite_ref-Renson1990_15-0)** Renson, P. (December 1990), "Liste des étoiles Ap et Am dans les amas ouverts (Edition révisée)", *Bulletin d'Information du Centre de Données Stellaires* (in French), **38**: 151, [Bibcode](/source/Bibcode_(identifier)):[1990BICDS..38..151R](https://ui.adsabs.harvard.edu/abs/1990BICDS..38..151R).

1. **[^](#cite_ref-Schroeder2007_16-0)** Schröder, C.; Schmitt, J. H. M. M. (November 2007), "X-ray emission from A-type stars", *Astronomy and Astrophysics*, **475** (2): 677−684, [Bibcode](/source/Bibcode_(identifier)):[2007A&A...475..677S](https://ui.adsabs.harvard.edu/abs/2007A&A...475..677S), [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20077429](https://doi.org/10.1051%2F0004-6361%3A20077429).

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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Adapted from the Wikipedia article [13 Comae Berenices](https://en.wikipedia.org/wiki/13_Comae_Berenices) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/13_Comae_Berenices?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.