Astronomy:Kepler-31

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Short description: Star in the constellation Cygnus
Kepler-31
Observation data
Equinox J2000.0]] (ICRS)
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[2] mas
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, http://www.iau.org/public/constellations/#cyg, retrieved 2011-12-15 
  2. 2.0 2.1 2.2 2.3 2.4 2.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  3. 3.0 3.1 3.2 3.3 3.4 3.5 3.6 Kepler-31b, NASA Ames Research Center, http://kepler.nasa.gov/Mission/discoveries/kepler30b/, retrieved 2011-12-06 
  4. 4.0 4.1 Schneider, Jean, Star: Kepler-23, http://exoplanet.eu/star.php?st=Kepler-31, 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. et al. (2011), "Architecture and Dynamics of Kepler 'S Candidate Multiple Transiting Planet Systems", The Astrophysical Journal Supplement Series 197 (1): 8, doi:10.1088/0067-0049/197/1/8, Bibcode2011ApJS..197....8L 
  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, doi:10.1051/0004-6361/201935259, Bibcode2019A&A...625A...7P 
  8. Planet Kepler-31 d at exoplanets.eu

Coordinates: Sky map 19h 36m 05.523s, +45° 51′ 11.09″