7 Comae Berenices
{{Short description|Star in the constellation Coma Berenices}}
{{Starbox begin
| name = 7 Comae Berenices
}}
{{Starbox observe
| epoch = J2000.0
| constell = Coma Berenices
| dec = {{DEC|+23|56|43.4700}}
}}
{{Starbox character
| type = red clump
| variable =
}}
{{Starbox astrometry
| radial_v = {{Val|−27.89|0.13}}
| parallax = 13.08
| p_error = 0.30
}}
{{Starbox detail
| mass = {{Val|2.37|0.16}}
| radius = {{Val|10.07|0.66}}
| temperature = {{Val|5023|25|fmt=commas}}
| luminosity = {{Val|63|14|12}}
| gravity = {{Val|2.95|0.08}}
| metal_fe = {{Val|−0.09|0.05}}
| rotational_velocity = {{Val|2.26|0.45}}
| age_myr = {{Val|730|150}}
}}
{{Starbox catalog
| names={{odlist | F=7 Com | BD=+24°2443 | FK5=2982 | HD=106714 | HIP=59847 | HR=4667 | SAO=82211 }}
}}
{{Starbox reference
| Simbad=7+Com
}}
{{Starbox end}}
7 Comae Berenices is a single star located 249 light years away in the northern constellation of Coma Berenices. It is a dim star but visible to the naked eye near the Coma Star Cluster with an apparent visual magnitude of 4.93. The star is moving closer to the Earth with a heliocentric radial velocity of −28 km/s, and is predicted to come as close as {{Convert|25.42|pc|ly|0|order=flip|abbr=off|disp=out}} in 2.4 million years.
This is an evolved giant star with a stellar classification of G8 III–IIIb. At the age of 730 million years it is a red clump giant, which indicates it is on the horizontal branch and is generating energy via helium fusion at its core. The star has 2.4 times the mass of the Sun and has expanded to 10 times the Sun's radius. It is radiating about 63 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 5,023 K.
References
{{reflist|refs=
{{cite simbad | title=7 Com | access-date=December 30, 2018 }}
| 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=. }}
| title=Validation of the new Hipparcos reduction
| last1=van Leeuwen | first1=F.
| journal=Astronomy and Astrophysics
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| arxiv=0708.1752 | bibcode=2007A&A...474..653V
| doi=10.1051/0004-6361:20078357 | s2cid=18759600 | postscript=. }}
| last1=Jofré | first1=E. | last2=Petrucci | first2=R.
| last3=Saffe | first3=C. | last4=Saker | first4=L.
| last5=de la Villarmois | first5=E. Artur | last6=Chavero | first6=C.
| last7=Gómez | first7=M. | last8=Mauas | first8=P. J. D.
| title=Stellar parameters and chemical abundances of 223 evolved stars with and without planets
| display-authors=1 | journal=Astronomy & Astrophysics
| volume=574 | pages=A50 | year=2015
| bibcode=2015A&A...574A..50J | arxiv=1410.6422
| doi=10.1051/0004-6361/201424474 | s2cid=53666931 | postscript=. }}
| title=The Perkins catalog of revised MK types for the cooler stars
| last1=Keenan | first1=Philip C. | last2=McNeil | first2=Raymond C.
| journal=Astrophysical Journal Supplement Series
| volume=71 | pages=245 | year=1989 | postscript=.
| bibcode=1989ApJS...71..245K | doi=10.1086/191373 }}
| title=XHIP: An extended hipparcos compilation
| last1=Anderson | first1=E. | last2=Francis | first2=Ch.
| postscript=. | journal=Astronomy Letters
| volume=38 | issue=5 | pages=331 | year=2012
| bibcode=2012AstL...38..331A | arxiv=1108.4971
| doi=10.1134/S1063773712050015 | s2cid=119257644 }}
| display-authors=1 | last1=Mishenina | first1=T. V.
| last2=Bienaymé | first2=O. | last3=Gorbaneva | first3=T. I.
| last4=Charbonnel | first4=C. | last5=Soubiran | first5=C.
| last6=Korotin | first6=S. A. | last7=Kovtyukh | first7=V. V.
| title=Elemental abundances in the atmosphere of clump giants
| journal=Astronomy and Astrophysics
| volume=456 | issue=3 | pages=1109–1120 | date=September 2006
| doi=10.1051/0004-6361:20065141 | postscript=.
| bibcode=2006A&A...456.1109M | arxiv=astro-ph/0605615 | s2cid=18764566 }}
}}
{{Stars of Coma Berenices}}
{{DEFAULTSORT:7 Comae Berenices}}
Category:Horizontal-branch stars