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Kepler-63
Observation data; Epoch J2000 Equinox J2000
Constellation	Cygnus
Right ascension	19h 16m 54.2861s
Declination	49° 32′ 53.451″
Apparent magnitude (V)	12.02
Characteristics
Evolutionary stage	Main sequence
Spectral type	G5
Astrometry
Radial velocity (Rv)	−21.7±0.8 km/s
Proper motion (μ)	RA: 14.375 mas/yr ; Dec.: 23.336 mas/yr
Parallax (π)	5.1157 ± 0.0096 mas
Distance	638 ± 1 ly ; (195.5 ± 0.4 pc)
Details
Mass	0.984+0.035; −0.040 M☉
Radius	0.901+0.027; −0.021 R☉
Luminosity	0.696+0.076; −0.059 L☉
Surface gravity (log g)	4.52±0.02 cgs
Temperature	5576±50 K
Metallicity [Fe/H]	0.05±0.08 dex
Rotation	5.4±0.009 days
Rotational velocity (v sin i)	5.6±0.8 km/s
Age	0.21±0.045 Gyr
Other designations
	KOI-63, TYC 3550-458-1, 2MASS J19165428+4932535, Gaia EDR3 2132628489996257920
Database references
SIMBAD	data

Kepler-63 is a G-type main-sequence star about 638 light-years away. The star is much younger than the Sun, at 0.21 billion years. Kepler-63 is similar to the Sun in its concentration of heavy elements.

The star is exhibiting strong starspot activity, with relatively cold (4700±300 K) starspots concentrated in two mid-latitude bands similar to the Sun,^[3] changing their position in a cycle with a period of 1.27±0.16 years.^[5] Due to high magnetic activity associated with its young age, Kepler-63 has a very hot corona heated to 8 million degrees, and produces over ten times the solar amount of x-rays than the Sun.^[6]

Multiplicity surveys did not detect any stellar companions to Kepler-63 by 2016.^[7]

Planetary system

In 2013 a transiting hot Jupiter planet b was detected on a tight orbit. The orbit is nearly polar to the equatorial plane of the star.^[4]

The Kepler-63 planetary system
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	< 0.377^[6] $M$ _J	0.080±0.002^[6]	9.4341505±0.000001^[3]	<0.45^[4]	87.806^+0.018 _−0.019^[3]°	0.54±0.02^[6] $R$ _J

References

^ ^a ^b ^c "Kepler-63", SIMBAD, Centre de données astronomiques de Strasbourg
^ ^a ^b ^c ^d Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
^ ^a ^b ^c ^d Netto, Y.; Valio, A. (2020), "Stellar magnetic activity and the butterfly diagram of Kepler-63", Astronomy & Astrophysics, 635: A78, arXiv:1911.08661, Bibcode:2020A&A...635A..78N, doi:10.1051/0004-6361/201936219, S2CID 208176115
^ ^a ^b ^c ^d ^e Sanchis-Ojeda, Roberto; Winn, Joshua N.; Marcy, Geoffrey W.; Howard, Andrew W.; Isaacson, Howard; Johnson, John Asher; Torres, Guillermo; Albrecht, Simon; Campante, Tiago L.; Chaplin, William J.; Davies, Guy R.; Lund, Mikkel N.; Carter, Joshua A.; Dawson, Rebekah I.; Buchhave, Lars A.; Everett, Mark E.; Fischer, Debra A.; Geary, John C.; Gilliland, Ronald L.; Horch, Elliott P.; Howell, Steve B.; Latham, David W. (2013), "KEPLER-63b: A GIANT PLANET IN a POLAR ORBIT AROUND a YOUNG SUN-LIKE STAR", The Astrophysical Journal, 775 (1): 54, arXiv:1307.8128, Bibcode:2013ApJ...775...54S, doi:10.1088/0004-637X/775/1/54, S2CID 36615256
^ Estrela, Raissa; Valio, Adriana (2016), Stellar magnetic cycles in the solar-like stars Kepler-17 and Kepler-63, arXiv:1608.07322
^ ^a ^b ^c ^d Lalitha, Sairam; Schmitt, J H M M.; Dash, Spandan (2018), "Atmospheric mass-loss of extrasolar planets orbiting magnetically active host stars", Monthly Notices of the Royal Astronomical Society, 477: 808–815, arXiv:1803.08684, doi:10.1093/mnras/sty732
^ Furlan, E.; Ciardi, D. R.; Everett, M. E.; Saylors, M.; Teske, J. K.; Horch, E. P.; Howell, S. B.; Van Belle, G. T.; Hirsch, L. A.; Gautier, T. N.; Adams, E. R.; Barrado, D.; Cartier, K. M. S.; Dressing, C. D.; Dupree, A. K.; Gilliland, R. L.; Lillo-Box, J.; Lucas, P. W.; Wang, J. (2016), "Thekeplerfollow-Up Observation Program. I. A Catalog of Companions Tokeplerstars from High-Resolution Imaging", The Astronomical Journal, 153 (2): 71, arXiv:1612.02392, doi:10.3847/1538-3881/153/2/71, S2CID 38339900

[SIMBAD-1] "Kepler-63", SIMBAD, Centre de données astronomiques de Strasbourg

[EDR3-2] Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.

[Netto2019-3] Netto, Y.; Valio, A. (2020), "Stellar magnetic activity and the butterfly diagram of Kepler-63", Astronomy & Astrophysics, 635: A78, arXiv:1911.08661, Bibcode:2020A&A...635A..78N, doi:10.1051/0004-6361/201936219, S2CID 208176115

[Sanchis2013-4] Sanchis-Ojeda, Roberto; Winn, Joshua N.; Marcy, Geoffrey W.; Howard, Andrew W.; Isaacson, Howard; Johnson, John Asher; Torres, Guillermo; Albrecht, Simon; Campante, Tiago L.; Chaplin, William J.; Davies, Guy R.; Lund, Mikkel N.; Carter, Joshua A.; Dawson, Rebekah I.; Buchhave, Lars A.; Everett, Mark E.; Fischer, Debra A.; Geary, John C.; Gilliland, Ronald L.; Horch, Elliott P.; Howell, Steve B.; Latham, David W. (2013), "KEPLER-63b: A GIANT PLANET IN a POLAR ORBIT AROUND a YOUNG SUN-LIKE STAR", The Astrophysical Journal, 775 (1): 54, arXiv:1307.8128, Bibcode:2013ApJ...775...54S, doi:10.1088/0004-637X/775/1/54, S2CID 36615256

[5] Estrela, Raissa; Valio, Adriana (2016), Stellar magnetic cycles in the solar-like stars Kepler-17 and Kepler-63, arXiv:1608.07322

[Sairam2018-6] Lalitha, Sairam; Schmitt, J H M M.; Dash, Spandan (2018), "Atmospheric mass-loss of extrasolar planets orbiting magnetically active host stars", Monthly Notices of the Royal Astronomical Society, 477: 808–815, arXiv:1803.08684, doi:10.1093/mnras/sty732

[7] Furlan, E.; Ciardi, D. R.; Everett, M. E.; Saylors, M.; Teske, J. K.; Horch, E. P.; Howell, S. B.; Van Belle, G. T.; Hirsch, L. A.; Gautier, T. N.; Adams, E. R.; Barrado, D.; Cartier, K. M. S.; Dressing, C. D.; Dupree, A. K.; Gilliland, R. L.; Lillo-Box, J.; Lucas, P. W.; Wang, J. (2016), "Thekeplerfollow-Up Observation Program. I. A Catalog of Companions Tokeplerstars from High-Resolution Imaging", The Astronomical Journal, 153 (2): 71, arXiv:1612.02392, doi:10.3847/1538-3881/153/2/71, S2CID 38339900

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