Kepler-31
Kepler-31 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. It is located at the celestial coordinates: Right Ascension 19h 36m 05.5270s, Declination +45° 51′ 11.106″.[2] With an apparent visual magnitude of 14.0,[3] this star is too faint to be seen with the naked eye.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | [corvus][1] |
| Right ascension | 19h 36m 05.5270s[2] |
| Declination | +45° 51′ 11.106″[2] |
| Apparent magnitude (V) | [3] |
| Characteristics | |
| Spectral type | G5[4] |
| Astrometry | |
| Proper motion (μ) | RA: −1.017±0.043[2] mas/yr Dec.: −7.344±0.044[2] mas/yr |
| Parallax (π) | 0.5722 ± 0.0230[2] mas |
| Distance | 5,700 ± 200 ly (1,750 ± 70 pc) |
| Details | |
| Mass | 1.21 ± 0.17[3] M☉ |
| Radius | 1.22 ± 0.24[3] R☉ |
| Luminosity | 0.79 ± 0.04[3] L☉ |
| Temperature | 6340 ± 200[3] K |
| Metallicity [Fe/H] | –0.076 ± 0.400[3] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
| KIC | data |
Planetary system
The three gas giant planets orbiting Kepler-31 were discovered in early 2011, albeit with large false alarm probability, and were confirmed in 2012.[5][6] The planets form a resonant chain, with orbital periods ratio 1:2:4, although 20% probability exists what these period ratios may be coincidental.[7]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | <6.8 MJ | 0.16 | 20.8613 | — | — | 0.38±0.07 RJ |
| c | <4.7 MJ | 0.26 | 42.6318 | — | — | 0.38±0.07 RJ |
| d | — | 0.39 | 87.648901±0.000801 | — | — | 0.407±0.099 RJ |
References
- "Cygnus – constellation boundary", The Constellations, International Astronomical Union, retrieved 2011-12-15
- 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.
- Kepler-31b, NASA Ames Research Center, retrieved 2011-12-06
- Schneider, Jean, "Star: Kepler-23", Extrasolar Planets Encyclopaedia, Paris Observatory, archived from the original on 2012-05-05, retrieved 2011-12-06
- ARCHITECTURE AND DYNAMICS OF KEPLER’S CANDIDATE MULTIPLE TRANSITING PLANET SYSTEMS, 2011, arXiv:1102.0543
- Transit Timing Observations from Kepler: IV. Confirmation of 4 Multiple Planet Systems by Simple Physical Models
- Pichierri, Gabriele; Batygin, Konstantin; Morbidelli, Alessandro (2019), "The role of dissipative evolution for three-planet, near-resonant extrasolar systems", Astronomy & Astrophysics, 625: A7, arXiv:1903.09474, doi:10.1051/0004-6361/201935259, S2CID 85459759
- Planet Kepler-31 d at exoplanets.eu
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