{{Short description|Star in the constellation Boötes}} {{Starbox begin}} {{Starbox observe | epoch = [[J2000.0]] ([[International Celestial Reference System|ICRS]]) | constell = [[Bootes]] | ra = {{RA|13|41|02.34661}}<ref name=GaiaDR2/> | dec = {{DEC|+22|29|44.7744}}<ref name=GaiaDR2/> | appmag_v = 5.63<ref name=Anderson2012/> }} {{Starbox character | type = [[red clump]]<ref name=soubiran2008/> | class = K0 III<ref name=Cowley1979/> | b-v = 1.009<ref name=Anderson2012/> | u-b = | variable = }} {{Starbox astrometry | radial_v = {{Val|+4.00|0.16}}<ref name=GaiaDR2/> | prop_mo_ra = −17.353<ref name=GaiaDR2/> | prop_mo_dec = −25.324<ref name=GaiaDR2/> | parallax = 9.6708 | p_error = 0.1033 | parallax_footnote = <ref name=GaiaDR2/> | absmag_v = 0.57<ref name=Anderson2012/> }} {{Starbox detail | source = <ref name=jofre2015/> | mass = {{Val|1.93|0.18}} | radius = {{Val|10.04|0.68}} | luminosity = {{Val|60.3|15.6|12.4}} | temperature = {{Val|4867|31|fmt=commas}} | metal_fe = {{Val|−0.05|0.03}} | gravity = {{Val|2.77|0.07}} | rotational_velocity = {{Val|2.21|0.45}} | age_gyr = {{Val|1.33|0.27}} }} {{Starbox catalog | names = {{odlist | F=2 Boo | BD=+23°2600 | HD=119126 | HIP=66763 | HR=5149 | SAO=82946 }}<ref name=Simbad/> }} {{Starbox reference | Simbad = 2+Boo }} {{Starbox end}}
'''2 Boötis''' is a single<ref name=Eggleton2008/> [[star]] in the northern [[constellation]] of [[Boötes]],<ref name=Simbad/> located 337 [[light year]]s away from the Sun.<ref name=GaiaDR2/> It is visible to the naked eye as a faint, yellow-hued star with an [[apparent visual magnitude]] of 5.63.<ref name=Anderson2012/> This object is moving further from the Earth with a heliocentric [[radial velocity]] of +4 km/s.<ref name=GaiaDR2/>
At the age of 1.33 billion years old,<ref name=jofre2015/> this is an [[stellar evolution|evolved]] [[giant star]] with a [[stellar classification]] of K0 III,<ref name=Cowley1979/> having exhausted the hydrogen at its [[stellar core|core]] and expanded off the [[main sequence]]. It has 1.9 times the [[mass of the Sun]] with ten times the [[Sun's radius]]. The star is radiating 60 times the [[luminosity of the Sun]] from its enlarged [[photosphere]] at an [[effective temperature]] of 4,867 K.<ref name=jofre2015/>
==References== <references> <ref name=GaiaDR2>{{cite DR2|1443435089669339648}}</ref>
<ref name=Simbad>{{cite simbad | title=2 Boo | access-date=2019-04-06 }}</ref>
<ref name=soubiran2008>{{citation |postscript=. |bibcode=2008A&A...480...91S |title=Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants |last1=Soubiran |first1=C. |last2=Bienaymé |first2=O. |last3=Mishenina |first3=T. V. |last4=Kovtyukh |first4=V. V. |journal=Astronomy and Astrophysics |date=2008 |volume=480 |issue=1 |page=91 |doi=10.1051/0004-6361:20078788 |arxiv=0712.1370 }}</ref>
<ref name=Cowley1979>{{citation | title=MK spectral types for some F and G stars | last1=Cowley | first1=A. P. | last2=Bidelman | first2=W. P. | journal=Publications of the Astronomical Society of the Pacific | volume=91 | pages=83–86 | date=February 1979 | postscript=. | doi=10.1086/130446 | bibcode=1979PASP...91...83C | doi-access=free }}</ref>
<ref name=jofre2015>{{citation | 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 | doi=10.1051/0004-6361/201424474 | arxiv=1410.6422 | s2cid=53666931 | postscript=. }}</ref>
<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 | postscript=. | arxiv=0806.2878 | s2cid=14878976 }}</ref>
<ref name=Anderson2012>{{citation | title=XHIP: An extended hipparcos compilation | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | arxiv=1108.4971 | s2cid=119257644 | postscript=. }}</ref> </references>
{{Stars of Boötes}}
{{DEFAULTSORT:2 Bootis}} [[Category:K-type giants]] [[Category:Boötes]] [[Category:Durchmusterung objects]] [[Category:Flamsteed objects|Bootis, 02]] [[Category:Henry Draper Catalogue objects|119126]] [[Category:Hipparcos objects|066763]] [[Category:Bright Star Catalogue objects|5149]] [[Category:Horizontal-branch stars]]