{{Short description|Star in the constellation Coma Berenices}} {{Starbox begin}} {{Starbox observe | epoch = J2000 | constell = [[Coma Berenices]]<ref name="Roman1987"/> | ra = {{RA|13|03|55.65}}<ref name = GaiaDR2/> | dec = {{DEC|+30|38|24.28}}<ref name = GaiaDR2/> | appmag_v = {{val|10.34|0.05}}<ref name = Collins2014/>}} {{Starbox character|class=F8IV-V<ref name = Collins2014/>}} {{starbox astrometry|parallax=4.1255|p_error=0.0338|parallax_footnote=<ref name = GaiaDR2/>|prop_mo_ra={{val|-5.106|0.052}}|prop_mo_dec={{val|+15.640|0.046}}|pm_footnote=<ref name = GaiaDR2/>|radial_v={{val|1.62|0.27}}<ref name = GaiaDR2/>}} {{Starbox detail|mass={{val|1.13|0.06}}<ref name = Bomono2017/>|radius={{val|1.53|0.14}}<ref name = Bomono2017/>|luminosity={{val|3.25|0.94|0.81}}<ref name = Collins2014/>|temperature={{val|6272|61|fmt=commas}}<ref name = Bomono2017/>|rotational_velocity={{val|4.53|0.26}}<ref name = Damasso2015/>|age_gyr={{val|4.9|0.7|0.5}}<ref name = Bomono2017/>|metal_fe=−0.28<ref name = Stassun2017/>|gravity={{val|4.07|0.06}}<ref name = Stassun2017/>}} {{Starbox catalog|names={{odlist|BD = +31 2447|Gaia DR2 = 1464700950221781504}}}} {{starbox reference|Simbad=KELT-6|NSTED=KELT-6|EPE=KELT-6}} {{Starbox end}}
'''KELT-6''', also known as '''BD+31 2447''', is a star in the [[constellation]] [[Coma Berenices]]. With an [[apparent magnitude]] of 10.34, it is impossible to see with the [[unaided eye]], but can be seen with a powerful telescope. The star is located 791 [[Light-year|light years]] away from the [[Solar System]] based on [[parallax]], but is drifting away with a [[radial velocity]] of 1.62 km/s.
== Properties == KELT-6 is an [[F-type star]] that is 13% more massive and 53% larger than the [[Sun]]. It radiates at 3.25 times the [[Sun's luminosity]] from its [[photosphere]] at an [[effective temperature]] of 6,727 [[Kelvin|K]]. KELT-6 has a projected rotational velocity of 4.53 km/s, and is slightly older than the Sun, with an age of 4.9 [[billion years]]. Unlike most host stars of exoplanets, it has a poor [[metallicity]], with 52.5% the abundance of heavy metals compared to the Sun.{{Citation needed|date=May 2026}}
== Planetary system == In 2013, a long period "hot Jupiter" was discovered orbiting the star using the transit method.<ref name = Collins2014/> Another planet was discovered in 2015 using the radial velocity ([[doppler spectroscopy]]) method.<ref name = Damasso2015/>
{{Orbitbox planet begin}} {{Orbitbox planet|exoplanet=[[KELT-6b|b]]|mass={{val|0.44|0.02}}<ref name = Bomono2017/>|semimajor={{val|0.08|0.00}}<ref name = Bomono2017/>|period={{val|7.85|0.00}}<ref name = Bomono2017/>|radius={{val|1.18|0.11}}<ref name = Bomono2017/>|eccentricity={{val|0.22|0.11}}<ref name = Stassun2017/>|inclination={{val|88.81|0.85}}<ref name = Stassun2017/>}} {{Orbitbox planet|mass={{val|3.71|0.21}}<ref name = Damasso2015/>|exoplanet=[[KELT-6c|c]]|period={{val|1276|81|67|fmt=commas}}<ref name = Damasso2015/>|eccentricity={{val|0.21|0.04}}<ref name = Damasso2015/>|semimajor={{val|2.39|0.11}}<ref name = Damasso2015/>}} {{Orbitbox end}}
== See also == * [[List of most luminous stars]] * [[List of most massive stars]] * [[Lists of stars]] * [[Lists of stars by constellation]]
== References ==
{{reflist||refs=<ref name = GaiaDR2>{{Cite DR2|1464700950221781504}}</ref>
<ref name = Collins2014>{{Cite journal|last1=Collins|first1=Karen A.|last2=Eastman|first2=Jason D.|last3=Beatty|first3=Thomas G.|last4=Siverd|first4=Robert J.|last5=Gaudi|first5=B. Scott|last6=Pepper|first6=Joshua|last7=Kielkopf|first7=John F.|last8=Johnson|first8=John Asher|last9=Howard|first9=Andrew W.|last10=Fischer|first10=Debra A.|last11=Manner|first11=Mark|date=2014-02-01|title=KELT-6b: A P ~ 7.9 Day Hot Saturn Transiting a Metal-poor Star with a Long-period Companion|url=http://adsabs.harvard.edu/abs/2014AJ....147...39C|journal=The Astronomical Journal|volume=147|issue=2 |pages=39|doi=10.1088/0004-6256/147/2/39|issn=0004-6256|arxiv=1308.2296|bibcode=2014AJ....147...39C |s2cid=15020416 }}</ref>
<ref name = Bomono2017>{{cite journal |last1=Bonomo |first1=A. S. |last2=Desidera |first2=S. |last3=Benatti |first3=S. |last4=Borsa |first4=F. |last5=Crespi |first5=S. |last6=Damasso |first6=M. |last7=Lanza |first7=A. F. |last8=Sozzetti |first8=A. |last9=Lodato |first9=G. |last10=Marzari |first10=F. |last11=Boccato |first11=C. |last12=Claudi |first12=R. U. |last13=Cosentino |first13=R. |last14=Covino |first14=E. |last15=Gratton |first15=R. |last16=Maggio |first16=A. |last17=Micela |first17=G. |last18=Molinari |first18=E. |last19=Pagano |first19=I. |last20=Piotto |first20=G. |last21=Poretti |first21=E. |last22=Smareglia |first22=R. |last23=Affer |first23=L. |last24=Biazzo |first24=K. |last25=Bignamini |first25=A. |last26=Esposito |first26=M. |last27=Giacobbe |first27=P. |last28=Hébrard |first28=G. |last29=Malavolta |first29=L. |last30=Maldonado |first30=J. |last31=Mancini |first31=L. |last32=Martinez Fiorenzano |first32=A. |last33=Masiero |first33=S. |last34=Nascimbeni |first34=V. |last35=Pedani |first35=M. |last36=Rainer |first36=M. |last37=Scandariato |first37=G. |title=The GAPS Programme with HARPS-N at TNG: XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets⋆ |journal=Astronomy & Astrophysics |date=June 2017 |volume=602 |pages=A107 |doi=10.1051/0004-6361/201629882 |arxiv=1704.00373 |bibcode=2017A&A...602A.107B |doi-access=free }}</ref>
<ref name = Stassun2017>{{cite journal |last1=Stassun |first1=Keivan G. |last2=Collins |first2=Karen A. |last3=Gaudi |first3=B. Scott |title=Accurate Empirical Radii and Masses of Planets and Their Host Stars with Gaia Parallaxes |journal=The Astronomical Journal |date=1 March 2017 |volume=153 |issue=3 |pages=136 |doi=10.3847/1538-3881/aa5df3 |issn=0004-6256|arxiv=1609.04389 |bibcode=2017AJ....153..136S |s2cid=119219062 |doi-access=free }}</ref>
<ref name = Damasso2015>{{cite journal |last1=Damasso |first1=M. |last2=Esposito |first2=M. |last3=Nascimbeni |first3=V. |last4=Desidera |first4=S. |last5=Bonomo |first5=A. S. |last6=Bieryla |first6=A. |last7=Malavolta |first7=L. |last8=Biazzo |first8=K. |last9=Sozzetti |first9=A. |last10=Covino |first10=E. |last11=Latham |first11=D. W. |last12=Gandolfi |first12=D. |last13=Rainer |first13=M. |last14=Petrovich |first14=C. |last15=Collins |first15=K. A. |last16=Boccato |first16=C. |last17=Claudi |first17=R. U. |last18=Cosentino |first18=R. |last19=Gratton |first19=R. |last20=Lanza |first20=A. F. |last21=Maggio |first21=A. |last22=Micela |first22=G. |last23=Molinari |first23=E. |last24=Pagano |first24=I. |last25=Piotto |first25=G. |last26=Poretti |first26=E. |last27=Smareglia |first27=R. |last28=Di Fabrizio |first28=L. |last29=Giacobbe |first29=P. |last30=Gomez-Jimenez |first30=M. |last31=Murabito |first31=S. |last32=Molinaro |first32=M. |last33=Affer |first33=L. |last34=Barbieri |first34=M. |last35=Bedin |first35=L. R. |last36=Benatti |first36=S. |last37=Borsa |first37=F. |last38=Maldonado |first38=J. |last39=Mancini |first39=L. |last40=Scandariato |first40=G. |last41=Southworth |first41=J. |last42=Zanmar Sanchez |first42=R. |title=The GAPS programme with HARPS-N at TNG. IX. The multi-planet system KELT-6: Detection of the planet KELT-6 c and measurement of the Rossiter-McLaughlin effect for KELT-6 b |journal=Astronomy and Astrophysics |date=1 September 2015 |volume=581 |pages=L6 |doi=10.1051/0004-6361/201526995 |arxiv=1508.06520 |bibcode=2015A&A...581L...6D |issn=0004-6361|doi-access=free }}</ref>
<ref name="Roman1987">{{Cite constellation|KELT-6}}</ref>
}}
{{Coma Berenices}} {{Portal bar|Astronomy|Stars|Outer space}} [[Category:F-type subgiants]] [[Category:Coma Berenices]] [[Category:Durchmusterung objects]] [[Category:Planetary systems with two confirmed planets]]