Kepler-23
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus[1] |
| Right ascension | 19h 36m 52.5356s[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 mas[2] |
| 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 | |
| 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 d was discovered in 2014.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.478+0.010 −0.0091 MJ |
0.075 | 7.106995 | — | — | 0.1511±0.0068 RJ |
| c | 0.189+0.036 −0.033 MJ |
0.099 | 10.742434 | — | — | 0.278±0.0089 RJ |
| d | 0.055+0.043 −0.037 MJ |
0.124 | 15.27429±0.00017 | — | — | 0.1994±0.0079 RJ |
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, 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
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