# KELT-6

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Star in the constellation Coma Berenices

KELT-6 Observation data Epoch J2000 Equinox J2000 Constellation Coma Berenices[1] Right ascension 13h 03m 55.65s[2] Declination +30° 38′ 24.28″[2] Apparent magnitude (V) 10.34±0.05[3] Characteristics Spectral type F8IV-V[3] Astrometry Radial velocity (Rv) 1.62±0.27[2] km/s Proper motion (μ) RA: −5.106±0.052 mas/yr[2] Dec.: +15.640±0.046 mas/yr[2] Parallax (π) 4.1255±0.0338 mas[2] Distance 791 ± 6 ly (242 ± 2 pc) Details Mass 1.13±0.06[4] M☉ Radius 1.53±0.14[4] R☉ Luminosity 3.25+0.94 −0.81[3] L☉ Surface gravity (log g) 4.07±0.06[5] cgs Temperature 6,272±61[4] K Metallicity [Fe/H] −0.28[5] dex Rotational velocity (v sin i) 4.53±0.26[6] km/s Age 4.9+0.7 −0.5[4] Gyr Other designations BD+31 2447, Gaia DR2 1464700950221781504 Database references SIMBAD data Exoplanet Archive data

**KELT-6**, also known as **BD+31 2447**, is a star in the [constellation](/source/Constellation) [Coma Berenices](/source/Coma_Berenices). With an [apparent magnitude](/source/Apparent_magnitude) of 10.34, it is impossible to see with the [unaided eye](/source/Unaided_eye), but can be seen with a powerful telescope. The star is located 791 [light years](/source/Light-year) away from the [Solar System](/source/Solar_System) based on [parallax](/source/Parallax), but is drifting away with a [radial velocity](/source/Radial_velocity) of 1.62 km/s.

## Properties

KELT-6 is an [F-type star](/source/F-type_star) that is 13% more massive and 53% larger than the [Sun](/source/Sun). It radiates at 3.25 times the [Sun's luminosity](/source/Sun's_luminosity) from its [photosphere](/source/Photosphere) at an [effective temperature](/source/Effective_temperature) of 6,727 [K](/source/Kelvin). 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](/source/Billion_years). Unlike most host stars of exoplanets, it has a poor [metallicity](/source/Metallicity), with 52.5% the abundance of heavy metals compared to the Sun.[*[citation needed](https://en.wikipedia.org/wiki/Wikipedia:Citation_needed)*]

## Planetary system

In 2013, a long period "hot Jupiter" was discovered orbiting the star using the transit method.[3] Another planet was discovered in 2015 using the radial velocity ([doppler spectroscopy](/source/Doppler_spectroscopy)) method.[6]

The KELT-6 planetary system Companion (in order from star) Mass Semimajor axis (AU) Orbital period (days) Eccentricity Inclination (°) Radius b 0.44±0.02[4] MJ 0.08±0.00[4] 7.85±0.00[4] 0.22±0.11[5] 88.81±0.85[5] 1.18±0.11[4] RJ c 3.71±0.21[6] MJ 2.39±0.11[6] 1,276+81 −67[6] 0.21±0.04[6] — —

## See also

- [List of most luminous stars](/source/List_of_most_luminous_stars)

- [List of most massive stars](/source/List_of_most_massive_stars)

- [Lists of stars](/source/Lists_of_stars)

- [Lists of stars by constellation](/source/Lists_of_stars_by_constellation)

## References

1. **[^](#cite_ref-Roman1987_1-0)** [Roman, Nancy G.](/source/Nancy_Roman) (1987). ["Identification of a constellation from a position"](https://doi.org/10.1086%2F132034). *[Publications of the Astronomical Society of the Pacific](/source/Publications_of_the_Astronomical_Society_of_the_Pacific)*. **99** (617): 695. [Bibcode](/source/Bibcode_(identifier)):[1987PASP...99..695R](https://ui.adsabs.harvard.edu/abs/1987PASP...99..695R). [doi](/source/Doi_(identifier)):[10.1086/132034](https://doi.org/10.1086%2F132034). [Constellation record for this object](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?source=VI%2F42%2Fout&%2F%2Ftables=VI%2F42%2Fout&-c=KELT-6&-c.eq=J2000&-c.r=++2&-c.u=arcmin&-c.geom=r&-source=&-source=VI%2F42%2Fout&-out=RA1875&-out=DE1875&-out=Cst) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-GaiaDR2_2-0) [***b***](#cite_ref-GaiaDR2_2-1) [***c***](#cite_ref-GaiaDR2_2-2) [***d***](#cite_ref-GaiaDR2_2-3) [***e***](#cite_ref-GaiaDR2_2-4) [Brown, A. G. A.](/source/Anthony_Brown_(scientist)); et al. ([Gaia collaboration](/source/Data_Processing_and_Analysis_Consortium)) (August 2018). ["*Gaia* Data Release 2: Summary of the contents and survey properties"](https://doi.org/10.1051%2F0004-6361%2F201833051). *[Astronomy & Astrophysics](/source/Astronomy_%26_Astrophysics)*. **616**. A1. [arXiv](/source/ArXiv_(identifier)):[1804.09365](https://arxiv.org/abs/1804.09365). [Bibcode](/source/Bibcode_(identifier)):[2018A&A...616A...1G](https://ui.adsabs.harvard.edu/abs/2018A&A...616A...1G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201833051](https://doi.org/10.1051%2F0004-6361%2F201833051). [Gaia DR2 record for this source](https://vizier.u-strasbg.fr/viz-bin/VizieR-S?Gaia%20DR2%201464700950221781504) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-Collins2014_3-0) [***b***](#cite_ref-Collins2014_3-1) [***c***](#cite_ref-Collins2014_3-2) [***d***](#cite_ref-Collins2014_3-3) Collins, Karen A.; Eastman, Jason D.; Beatty, Thomas G.; Siverd, Robert J.; Gaudi, B. Scott; Pepper, Joshua; Kielkopf, John F.; Johnson, John Asher; Howard, Andrew W.; Fischer, Debra A.; Manner, Mark (2014-02-01). ["KELT-6b: A P ~ 7.9 Day Hot Saturn Transiting a Metal-poor Star with a Long-period Companion"](http://adsabs.harvard.edu/abs/2014AJ....147...39C). *The Astronomical Journal*. **147** (2): 39. [arXiv](/source/ArXiv_(identifier)):[1308.2296](https://arxiv.org/abs/1308.2296). [Bibcode](/source/Bibcode_(identifier)):[2014AJ....147...39C](https://ui.adsabs.harvard.edu/abs/2014AJ....147...39C). [doi](/source/Doi_(identifier)):[10.1088/0004-6256/147/2/39](https://doi.org/10.1088%2F0004-6256%2F147%2F2%2F39). [ISSN](/source/ISSN_(identifier)) [0004-6256](https://search.worldcat.org/issn/0004-6256). [S2CID](/source/S2CID_(identifier)) [15020416](https://api.semanticscholar.org/CorpusID:15020416).

1. ^ [***a***](#cite_ref-Bomono2017_4-0) [***b***](#cite_ref-Bomono2017_4-1) [***c***](#cite_ref-Bomono2017_4-2) [***d***](#cite_ref-Bomono2017_4-3) [***e***](#cite_ref-Bomono2017_4-4) [***f***](#cite_ref-Bomono2017_4-5) [***g***](#cite_ref-Bomono2017_4-6) [***h***](#cite_ref-Bomono2017_4-7) Bonomo, A. S.; Desidera, S.; Benatti, S.; Borsa, F.; Crespi, S.; Damasso, M.; Lanza, A. F.; Sozzetti, A.; Lodato, G.; Marzari, F.; Boccato, C.; Claudi, R. U.; Cosentino, R.; Covino, E.; Gratton, R.; Maggio, A.; Micela, G.; Molinari, E.; Pagano, I.; Piotto, G.; Poretti, E.; Smareglia, R.; Affer, L.; Biazzo, K.; Bignamini, A.; Esposito, M.; Giacobbe, P.; Hébrard, G.; Malavolta, L.; Maldonado, J.; Mancini, L.; Martinez Fiorenzano, A.; Masiero, S.; Nascimbeni, V.; Pedani, M.; Rainer, M.; Scandariato, G. (June 2017). ["The GAPS Programme with HARPS-N at TNG: XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets⋆"](https://doi.org/10.1051%2F0004-6361%2F201629882). *Astronomy & Astrophysics*. **602**: A107. [arXiv](/source/ArXiv_(identifier)):[1704.00373](https://arxiv.org/abs/1704.00373). [Bibcode](/source/Bibcode_(identifier)):[2017A&A...602A.107B](https://ui.adsabs.harvard.edu/abs/2017A&A...602A.107B). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201629882](https://doi.org/10.1051%2F0004-6361%2F201629882).

1. ^ [***a***](#cite_ref-Stassun2017_5-0) [***b***](#cite_ref-Stassun2017_5-1) [***c***](#cite_ref-Stassun2017_5-2) [***d***](#cite_ref-Stassun2017_5-3) Stassun, Keivan G.; Collins, Karen A.; Gaudi, B. Scott (1 March 2017). ["Accurate Empirical Radii and Masses of Planets and Their Host Stars with Gaia Parallaxes"](https://doi.org/10.3847%2F1538-3881%2Faa5df3). *The Astronomical Journal*. **153** (3): 136. [arXiv](/source/ArXiv_(identifier)):[1609.04389](https://arxiv.org/abs/1609.04389). [Bibcode](/source/Bibcode_(identifier)):[2017AJ....153..136S](https://ui.adsabs.harvard.edu/abs/2017AJ....153..136S). [doi](/source/Doi_(identifier)):[10.3847/1538-3881/aa5df3](https://doi.org/10.3847%2F1538-3881%2Faa5df3). [ISSN](/source/ISSN_(identifier)) [0004-6256](https://search.worldcat.org/issn/0004-6256). [S2CID](/source/S2CID_(identifier)) [119219062](https://api.semanticscholar.org/CorpusID:119219062).

1. ^ [***a***](#cite_ref-Damasso2015_6-0) [***b***](#cite_ref-Damasso2015_6-1) [***c***](#cite_ref-Damasso2015_6-2) [***d***](#cite_ref-Damasso2015_6-3) [***e***](#cite_ref-Damasso2015_6-4) [***f***](#cite_ref-Damasso2015_6-5) Damasso, M.; Esposito, M.; Nascimbeni, V.; Desidera, S.; Bonomo, A. S.; Bieryla, A.; Malavolta, L.; Biazzo, K.; Sozzetti, A.; Covino, E.; Latham, D. W.; Gandolfi, D.; Rainer, M.; Petrovich, C.; Collins, K. A.; Boccato, C.; Claudi, R. U.; Cosentino, R.; Gratton, R.; Lanza, A. F.; Maggio, A.; Micela, G.; Molinari, E.; Pagano, I.; Piotto, G.; Poretti, E.; Smareglia, R.; Di Fabrizio, L.; Giacobbe, P.; Gomez-Jimenez, M.; Murabito, S.; Molinaro, M.; Affer, L.; Barbieri, M.; Bedin, L. R.; Benatti, S.; Borsa, F.; Maldonado, J.; Mancini, L.; Scandariato, G.; Southworth, J.; Zanmar Sanchez, R. (1 September 2015). ["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"](https://doi.org/10.1051%2F0004-6361%2F201526995). *Astronomy and Astrophysics*. **581**: L6. [arXiv](/source/ArXiv_(identifier)):[1508.06520](https://arxiv.org/abs/1508.06520). [Bibcode](/source/Bibcode_(identifier)):[2015A&A...581L...6D](https://ui.adsabs.harvard.edu/abs/2015A&A...581L...6D). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201526995](https://doi.org/10.1051%2F0004-6361%2F201526995). [ISSN](/source/ISSN_(identifier)) [0004-6361](https://search.worldcat.org/issn/0004-6361).

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 [KELT-6](https://en.wikipedia.org/wiki/KELT-6) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/KELT-6?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.