Kepler-23

Kepler-23
Observation data; Epoch J2000 Equinox J2000
Constellation	Cygnus
Right ascension	19h 36m 52.5356s
Declination	+49° 28′ 45.253″
Apparent magnitude (V)	14.0
Characteristics
Spectral type	G5
Astrometry
Proper motion (μ)	RA: 2.262±0.030 mas/yr ; Dec.: 3.851±0.031 mas/yr
Parallax (π)	1.1678 ± 0.0161 mas
Distance	2,790 ± 40 ly ; (860 ± 10 pc)
Details
Mass	1.11 M☉
Radius	1.52 ± 0.24 R☉
Luminosity	0.79 ± 0.04 L☉
Temperature	5760 ± 124 K
Metallicity [Fe/H]	–0.09 ± 0.14 dex
Rotational velocity (v sin i)	km/s
Other designations
	Gaia DR2 2135019107451751168, KOI-168, KIC 11512246, GSC 03564-01806, 2MASS J19365254+4928452
Database references
SIMBAD	data
KIC	data

Kepler-23 is a star in the northern constellation of Cygnus, the swan, that is orbited by a planet found to be unequivocally within the star's habitable zone. With an apparent visual magnitude of 14.0,^[3] this star is too faint to be seen with the naked eye.

Planetary system[]

Planets b and c were discovered in 2011 and were confirmed in 2012.^[6] An additional planet was discovered in 2014.

The Kepler-23 planetary system^[4]^[7]^[8]
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	0.478^+0.010 _−0.0091 M_J	0.075	7.106995	—	—	0.1511±0.0068 R_J
c	0.189^+0.036 _−0.033 M_J	0.099	10.742434	—	—	0.278±0.0089 R_J
	0.055^+0.043 _−0.037 M_J	0.124	15.27429±0.00017	—	—	0.1994±0.0079 R_J

References[]

^ "Cygnus – constellation boundary", The Constellations, International Astronomical Union, retrieved 2011-12-15
^ ^a ^b ^c ^d ^e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
^ ^a ^b ^c ^d ^e ^f ^g ^h Kepler-23b, NASA Ames Research Center, archived from the original on 2012-05-03, retrieved 2011-12-06
^ ^a ^b Schneider, Jean, "Star: Kepler-23", Extrasolar Planets Encyclopaedia, Paris Observatory, archived from the original on 2012-04-19, retrieved 2011-12-06
^ "Kepler-23". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 31 January 2018.
^ Ford, Eric B.; Fabrycky, Daniel C.; Steffen, Jason H.; Carter, Joshua A.; Fressin, Francois; Holman, Matthew J.; Lissauer, Jack J.; Moorhead, Althea V.; Morehead, Robert C.; Ragozzine, Darin; Rowe, Jason F.; Welsh, William F.; Allen, Christopher; Batalha, Natalie M.; Borucki, William J.; Bryson, Stephen T.; Buchhave, Lars A.; Burke, Christopher J.; Caldwell, Douglas A.; Charbonneau, David; Clarke, Bruce D.; Cochran, William D.; Désert, Jean-Michel; Endl, Michael; Everett, Mark E.; Fischer, Debra A.; Gautier III, Thomas N.; Gilliland, Ron L.; Jenkins, Jon M.; et al. (2012), "Transit Timing Observations Fromkepler. Ii. Confirmation of Two Multiplanet Systems Via a Non-Parametric Correlation Analysis", The Astrophysical Journal, 750 (2): 113, arXiv:1201.5409, doi:10.1088/0004-637X/750/2/113, S2CID 4528963
^ Rowe, Jason F.; Bryson, Stephen T.; Marcy, Geoffrey W.; Lissauer, Jack J.; Jontof-Hutter, Daniel; Mullally, Fergal; Gilliland, Ronald L.; Issacson, Howard; Ford, Eric; Howell, Steve B.; Borucki, William J.; Haas, Michael; Huber, Daniel; Steffen, Jason H.; Thompson, Susan E.; Quintana, Elisa; Barclay, Thomas; Still, Martin; Fortney, Jonathan; Gautier III, T. N.; Hunter, Roger; Caldwell, Douglas A.; Ciardi Edna Devore, David R.; Cochran, William; Jenkins, Jon; Agol, Eric; Carter, Joshua A.; Geary, John (2014), Validation of Kepler's Multiple Planet Candidates. III: Light Curve Analysis & Announcement of Hundreds of New Multi-planet Systems, arXiv:1402.6534, doi:10.1088/0004-637X/784/1/45, S2CID 119118620
^ Van Eylen, Vincent; Albrecht, Simon (2015), "Eccentricity from Transit Photometry: Small Planets in Kepler Multi-Planet Systems Have Low Eccentricities", The Astrophysical Journal, 808 (2): 126, arXiv:1505.02814, doi:10.1088/0004-637X/808/2/126, S2CID 14405731

Coordinates: 19^h 36^m 52.0^s, +49° 28′ 45″

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[IAU_const-1] "Cygnus – constellation boundary", The Constellations, International Astronomical Union, retrieved 2011-12-15

[Gaia_DR2-2] Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.

[nasa_ames-3] ^ ^a ^b ^c ^d ^e ^f ^g ^h Kepler-23b, NASA Ames Research Center, archived from the original on 2012-05-03, retrieved 2011-12-06

[epe-4] Schneider, Jean, "Star: Kepler-23", Extrasolar Planets Encyclopaedia, Paris Observatory, archived from the original on 2012-04-19, retrieved 2011-12-06

[5] "Kepler-23". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 31 January 2018.

[Ford2012-6] Ford, Eric B.; Fabrycky, Daniel C.; Steffen, Jason H.; Carter, Joshua A.; Fressin, Francois; Holman, Matthew J.; Lissauer, Jack J.; Moorhead, Althea V.; Morehead, Robert C.; Ragozzine, Darin; Rowe, Jason F.; Welsh, William F.; Allen, Christopher; Batalha, Natalie M.; Borucki, William J.; Bryson, Stephen T.; Buchhave, Lars A.; Burke, Christopher J.; Caldwell, Douglas A.; Charbonneau, David; Clarke, Bruce D.; Cochran, William D.; Désert, Jean-Michel; Endl, Michael; Everett, Mark E.; Fischer, Debra A.; Gautier III, Thomas N.; Gilliland, Ron L.; Jenkins, Jon M.; et al. (2012), "Transit Timing Observations Fromkepler. Ii. Confirmation of Two Multiplanet Systems Via a Non-Parametric Correlation Analysis", The Astrophysical Journal, 750 (2): 113, arXiv:1201.5409, doi:10.1088/0004-637X/750/2/113, S2CID 4528963

[7] Rowe, Jason F.; Bryson, Stephen T.; Marcy, Geoffrey W.; Lissauer, Jack J.; Jontof-Hutter, Daniel; Mullally, Fergal; Gilliland, Ronald L.; Issacson, Howard; Ford, Eric; Howell, Steve B.; Borucki, William J.; Haas, Michael; Huber, Daniel; Steffen, Jason H.; Thompson, Susan E.; Quintana, Elisa; Barclay, Thomas; Still, Martin; Fortney, Jonathan; Gautier III, T. N.; Hunter, Roger; Caldwell, Douglas A.; Ciardi Edna Devore, David R.; Cochran, William; Jenkins, Jon; Agol, Eric; Carter, Joshua A.; Geary, John (2014), Validation of Kepler's Multiple Planet Candidates. III: Light Curve Analysis & Announcement of Hundreds of New Multi-planet Systems, arXiv:1402.6534, doi:10.1088/0004-637X/784/1/45, S2CID 119118620

[8] Van Eylen, Vincent; Albrecht, Simon (2015), "Eccentricity from Transit Photometry: Small Planets in Kepler Multi-Planet Systems Have Low Eccentricities", The Astrophysical Journal, 808 (2): 126, arXiv:1505.02814, doi:10.1088/0004-637X/808/2/126, S2CID 14405731

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]

Observation data Epoch J2000 Equinox J2000
Constellation	Cygnus^[1]
Right ascension	19^h 36^m 52.5356^s^[2]
Declination	+49° 28′ 45.253″^[2]
Apparent magnitude (V)	14.0^[3]
Characteristics
Spectral type	G5^[4]
Astrometry

Proper motion (μ)	RA: 2.262±0.030^[2] mas/yr Dec.: 3.851±0.031^[2] mas/yr
Parallax (π)	1.1678 ± 0.0161^[2] mas
Distance	2,790 ± 40 ly (860 ± 10 pc)

Details

Mass	1.11^[3] `M`_☉
Radius	1.52 ± 0.24^[3] `R`_☉
Luminosity	0.79 ± 0.04^[3] `L`_☉
Temperature	5760 ± 124^[3] K
Metallicity [Fe/H]	–0.09 ± 0.14^[3] dex
Rotational velocity (v sin i)	^[3] km/s

Other designations
Gaia DR2 2135019107451751168, KOI-168, KIC 11512246, GSC 03564-01806, 2MASS J19365254+4928452^[5]
Database references
SIMBAD	data
KIC	data