{{Short description|Star in the constellation Coma Berenices}} {{Starbox begin | name = [[Bayer designation|γ Comae Berenices]]}} {{Starbox image | image = {{Location mark | image = Coma Berenices constellation map.svg | width = 250 | alt = Map of the constellation Coma Berenices | float = center | mark = Red circle.svg | mark_width = 10 | x = 475 | y = 225 }} | caption = γ Comae Berenices (circled) in the constellation Coma Berenices }} {{Starbox observe | epoch = [[J2000.0]] | equinox = [[J2000.0]] ([[International Celestial Reference System|ICRS]]) | constell = [[Coma Berenices (constellation)|Coma Berenices]] | ra = {{RA|12|26|56.27207}}<ref name=vanLeeuwen2007>{{citation | title=Validation of the new Hipparcos reduction | last1=van Leeuwen | first1=F. | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | date=2007 | arxiv=0708.1752 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 | s2cid=18759600 | postscript=. }}</ref> | dec = {{DEC|+28|16|06.3211}}<ref name=vanLeeuwen2007/> | appmag_v=4.36<ref name=haupt1974>{{citation | last1=Haupt | first1=H. F. | last2=Schroll | first2=A. | title=Photoelektrische Photometrie von Shell-Sternen | journal=Astronomy and Astrophysics Supplement Series | volume=15 | page=311 | year=1974 | bibcode=1974A&AS...15..311H | postscript=. }}</ref> }} {{Starbox character | class = {{nowrap|K1 III Fe0.5}}<ref name=perkins1989>{{citation | title=The Perkins catalog of revised MK types for the cooler stars | journal=Astrophysical Journal Supplement Series | volume=71 | pages=245 | last1=Keenan | first1=Philip C | last2=McNeil | first2=Raymond C | year=1989 | bibcode=1989ApJS...71..245K | doi=10.1086/191373 | postscript=. }}</ref> | u-b = +1.16<ref name=haupt1974/> | b-v = +1.13<ref name=haupt1974/> | r-i = +0.51<ref name=bsc1>{{citation | url=http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=V/50/catalog&recno=4737 | title=HR 4737 database entry | work=The Bright Star Catalogue | edition=5th Revised (Preliminary Version) | first1=D. | last1=Hoffleit | first2=W. H. | last2=Warren, Jr. }}</ref> }} {{Starbox astrometry | radial_v = {{Val|+3.38|0.11}}<ref name=aaa430_165>{{citation | display-authors=1 | last1=Famaey | first1=B. | last2=Jorissen | first2=A. | last3=Luri | first3=X. | last4=Mayor | first4=M. | last5=Udry | first5=S. | last6=Dejonghe | first6=H. | last7=Turon | first7=C. | title=Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters | journal=Astronomy and Astrophysics | volume=430 | issue=1 | pages=165–186 |date=January 2005 | doi=10.1051/0004-6361:20041272 | bibcode=2005A&A...430..165F |arxiv = astro-ph/0409579 | s2cid=17804304 }}</ref> | prop_mo_ra = −83.990 ± 0.418<ref name=Gaia-DR2/> | prop_mo_dec = −82.216 ± 0.345<ref name=Gaia-DR2/> | parallax = 19.2552 | p_error = 0.2371 | parallax_footnote = <ref name=Gaia-DR2>{{cite DR2|4009317512294635008}}</ref> | absmag_v= 0.76<ref name=aaa454_3_943>{{citation | display-authors=1 | last1=Hekker | first1=S. | last2=Reffert | first2=S. | last3=Quirrenbach | first3=A. | last4=Mitchell | first4=D. S. | last5=Fischer | first5=D. A. | last6=Marcy | first6=G. W. | last7=Butler | first7=R. P. | title=Precise radial velocities of giant stars. I. Stable stars | journal=Astronomy and Astrophysics | volume=454 | issue=3 | pages=943–949 |date=August 2006 | doi=10.1051/0004-6361:20064946 | bibcode=2006A&A...454..943H |arxiv = astro-ph/0604502 | s2cid=119529768 }}</ref> }} {{Starbox detail | source = <ref name=Reffert2015>{{citation | title=Precise radial velocities of giant stars. VII. Occurrence rate of giant extrasolar planets as a function of mass and metallicity | display-authors=1 | last1=Reffert | first1=Sabine | last2=Bergmann | first2=Christoph | last3=Quirrenbach | first3=Andreas | last4=Trifonov | first4=Trifon | last5=Künstler | first5=Andreas | journal=Astronomy and Astrophysics | volume=574A | issue=2 | pages=116–129 | date=2015 | bibcode=2015A&A...574A.116R | doi=10.1051/0004-6361/201322360 | arxiv=1412.4634 | s2cid=59334290 | postscript=. }}</ref> | rotational_velocity = ≤ 17<ref name=bsc1 /> | mass = {{Val|1.65|0.18}} | radius = {{val|12.01|0.36|0.34}}<ref name=Baines2018/> | luminosity = {{Val|61.4|3.3}}<ref name=Baines2018/> | temperature = {{Val|4660|84|fmt=commas}}<ref name=Baines2018/> | gravity = {{Val|2.53|0.05}} | metal_fe = {{Val|0.16|0.10}} | age_gyr = {{Val|2.72|0.78}} }} {{Starbox catalog | names={{odlist | B=γ Com | F=15 Comae Berenices | BD=+29°2288 | FK5=2999 | HD=108381 | HIP=60742 | HR=4737 | SAO=82313 | GC=16964 | PPM=101903 }}<ref name=sb0>{{SIMBAD link|gamma+comae+berenices|* gam Com -- Star in Cluster}}, database entry, [[SIMBAD]]. Accessed on line October 12, 2010.</ref> }} {{Starbox reference | Simbad=gamma+comae+berenices }} {{Starbox end}}
'''Gamma Comae Berenices''', [[Latinisation of names|Latinized]] from γ Comae Berenices, is a single,<ref name=Eggleton2008/> orange-hued [[star]] in the northern [[constellation]] of [[Coma Berenices (constellation)|Coma Berenices]]. It is faintly visible to the naked eye, having an [[apparent visual magnitude]] of 4.36.<ref name=haupt1974/> Based upon an annual [[stellar parallax|parallax shift]] of 19.50 [[milliarcsecond|mas]] as seen from Earth, its distance can be estimated as around 167 [[light year]]s from the [[Sun]]. The star is moving away from the Sun with a [[radial velocity]] of +3 km/s.<ref name=aaa430_165/>
This is an [[stellar evolution|evolved]] [[K-type star|K-type]] [[giant star]] with a [[stellar classification]] of {{nowrap|K1 III Fe0.5}}.<ref name=perkins1989/> The suffix notation indicates the star displays an overabundance of iron in its [[spectrum]]. It is most likely (91% chance) on the [[horizontal branch]] with an age of 2.7 billion years. If this is true, then it has an estimated 1.65 times the [[mass of the Sun]] and has expanded to nearly 12 times the [[Sun's radius]]. The star is radiating 58 times the [[Sun's luminosity]] from its enlarged [[photosphere]] at an [[effective temperature]] of around 4,652 K.<ref name=Reffert2015/> Gamma Comae Berenices appears as part of the [[Coma Star Cluster]], although it is probably not actually a member of this cluster.<ref>{{citation | page=[https://archive.org/details/binocularastrono0000tonk/page/124 124] | title=Binocular astronomy | first1=Stephen F. | last1=Tonkin | publisher=Springer | year=2007 | isbn=978-1-84628-308-6 | postscript=. | url=https://archive.org/details/binocularastrono0000tonk/page/124 }}</ref>
R. H. Allen's ''[[Star Names]]'' attributes the name ''Al Ḍafīrah'' to this star, from an Arabic name for the Coma Star Cluster.<ref name=allen1899/> In [[Chinese astronomy]], it is identified as ''Lángwèiyī'' ({{lang|zh|郎位一}}), meaning it is the first star of the asterism ''Lángwèi'' ({{lang|zh|郎位}}, Officers of the Imperial Guard).<ref name=AEEA/><ref name=ASE/>
==References== <references> <ref name=Eggleton2008>{{citation | last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. | title=A catalogue of multiplicity among bright stellar systems | journal=[[Monthly Notices of the Royal Astronomical Society]] | volume=389 | issue=2 | pages=869–879 | date=September 2008 | doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | bibcode=2008MNRAS.389..869E | arxiv=0806.2878 | s2cid=14878976 | postscript=. }}</ref>
<ref name=Baines2018>{{citation | title=Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer | last1=Baines | first1=Ellyn K. | last2=Armstrong | first2=J. Thomas | last3=Schmitt | first3=Henrique R. | last4=Zavala | first4=R. T. | last5=Benson | first5=James A. | last6=Hutter | first6=Donald J. | last7=Tycner | first7=Christopher | last8=Belle | first8=Gerard T. van | display-authors=1 | journal=The Astronomical Journal | volume=155 | at=30 | year=2018 | issue=1 | arxiv=1712.08109 | bibcode=2018AJ....155...30B | doi=10.3847/1538-3881/aa9d8b | s2cid=119427037 | doi-access=free }}.</ref>
<ref name=allen1899>{{citation | first1=R. H. | last1=Allen | title=Star Names: Their Lore and Meaning | date=1899 | url=https://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Coma_Berenices*.html | page=171 }}</ref>
<ref name=AEEA>{{cite web |title=AEEA 天文教育資訊網 |trans-title=Activities of Exhibition and Education in Astronomy |language=zh |url=http://aeea.nmns.edu.tw/2006/0606/ap060621.html |archive-url=https://web.archive.org/web/20231201201450/http://aeea.nmns.edu.tw/2006/0606/ap060621.html |archive-date=1 December 2023 |url-status=dead}}</ref>
<ref name=ASE>{{cite web |title=Langwei (郎位) |url=https://ase.exopla.net/index.php/Langwei |website=All Skies Encyclopaedia |publisher=[[IAU Working Group on Star Names]] |access-date=1 August 2025}}</ref> </references>
{{Stars of Coma Berenices}}
[[Category:K-type giants]] [[Category:Coma Berenices]] [[Category:Bayer objects|Comae Berenices, Gamma]] [[Category:Durchmusterung objects|BD+29 2288]] [[Category:Flamsteed objects|Comae Berenices, 15]] [[Category:Henry Draper Catalogue objects|108381]] [[Category:Hipparcos objects|060742]] [[Category:Bright Star Catalogue objects|4737]]