Kepler-31
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) 14.0[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 mas[2]
Distance5,700 ± 200 ly
(1,750 ± 70 pc)
Details
Mass1.21 ± 0.17[3] M☉
Radius1.22 ± 0.24[3] R☉
Luminosity0.79 ± 0.04[3] L☉
Temperature6340 ± 200[3] K
Metallicity [Fe/H]–0.076 ± 0.400[3] dex
Other designations
KOI-935, KIC 9347899, 2MASS J19360552+4551110, Gaia DR2 2128013019361703936
Database references
SIMBADdata
KICdata

Kepler-31 is a star in the northern constellation of Cygnus, the swan. It is orbited by three known exoplanets. 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.

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 that these period ratios may be coincidental.[7]

The Kepler-31 planetary system[4][8]
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

  1. ^ "Cygnus – constellation boundary", The Constellations, International Astronomical Union, retrieved 2011-12-15
  2. ^ a b c d e f 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.
  3. ^ a b c d e f g Kepler-31b, NASA Ames Research Center, archived from the original on 2012-05-03, retrieved 2011-12-06
  4. ^ a b Schneider, Jean, "Star: Kepler-23", Extrasolar Planets Encyclopaedia, archived from the original on 2012-05-05, retrieved 2011-12-06
  5. ^ Lissauer, Jack J.; Ragozzine, Darin; Fabrycky, Daniel C.; Steffen, Jason H.; Ford, Eric B.; Jenkins, Jon M.; Shporer, Avi; Holman, Matthew J.; Rowe, Jason F.; Quintana, Elisa V.; Batalha, Natalie M.; Borucki, William J.; Bryson, Stephen T.; Caldwell, Douglas A.; Carter, Joshua A.; Ciardi, David; Dunham, Edward W.; Fortney, Jonathan J.; Gautier, Iii, Thomas N.; Howell, Steve B.; Koch, David G.; Latham, David W.; Marcy, Geoffrey W.; Morehead, Robert C.; Sasselov, Dimitar (2011), "Architecture and Dynamics of Kepler 'S Candidate Multiple Transiting Planet Systems", The Astrophysical Journal Supplement Series, 197 (1): 8, arXiv:1102.0543, Bibcode:2011ApJS..197....8L, doi:10.1088/0067-0049/197/1/8, S2CID 43095783
  6. ^ Transit Timing Observations from Kepler: IV. Confirmation of 4 Multiple Planet Systems by Simple Physical Models
  7. ^ 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, Bibcode:2019A&A...625A...7P, doi:10.1051/0004-6361/201935259, S2CID 85459759
  8. ^ Planet Kepler-31 d at exoplanets.eu


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