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Coordinates: Sky map 19h 36m 05.523s, +45° 51′ 11.09″
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| url=http://www.iau.org/public/constellations/#cyg
| url=http://www.iau.org/public/constellations/#cyg
| access-date=2011-12-15 }}</ref>
| access-date=2011-12-15 }}</ref>
| ra = {{RA|19|36|05.5270}}<ref name="Gaia DR2"/>
| ra = {{RA|19|36|05.5270}}<ref name="Gaia DR3"/>
| dec = {{DEC|+45|51|11.106}}<ref name="Gaia DR2"/>
| dec = {{DEC|+45|51|11.108}}<ref name="Gaia DR3"/>
| appmag_v = 14.0<ref name=nasa_ames>{{citation
| appmag_v = 14.0<ref name=nasa_ames>{{citation
| title=Kepler-31b
| title=Kepler-31b
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{{Starbox astrometry
{{Starbox astrometry
| radial_v =
| radial_v =
| prop_mo_ra = {{val|−1.017|0.043}}<ref name="Gaia DR2"/>
| prop_mo_ra = {{val|−1.007|(25)}}
| prop_mo_dec = {{val|−7.344|0.044}}<ref name="Gaia DR2"/>
| prop_mo_dec = {{val|−7.439|(23)}}
| pm_footnote = <ref name="Gaia DR3"/>
| parallax = 0.5722
| parallax = 0.6013
| p_error = 0.0230
| p_error = 0.0200
| parallax_footnote = <ref name="Gaia DR2"/>
| parallax_footnote = <ref name="Gaia DR3"/>
| absmag_v =
| absmag_v =
}}
}}
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}}
}}
{{Starbox end}}
{{Starbox end}}
'''Kepler-31''' is a [[star]] in the northern [[constellation]] of [[Cygnus (constellation)|Cygnus]], the swan. It is orbited by three known [[exoplanet]]s. It is located at the [[celestial coordinates]]: Right Ascension {{RA|19|36|05.5270}}, Declination {{DEC|+45|51|11.106}}.<ref name="Gaia DR2"/> With an [[apparent visual magnitude]] of 14.0,<ref name=nasa_ames/> this star is too faint to be seen with the naked eye.
'''Kepler-31''' is a [[star]] in the northern [[constellation]] of [[Cygnus (constellation)|Cygnus]], the swan. It is orbited by three known [[exoplanet]]s. It is located at the [[celestial coordinates]]: Right Ascension {{RA|19|36|05.5270}}, Declination {{DEC|+45|51|11.108}}.<ref name="Gaia DR3"/> With an [[apparent visual magnitude]] of 14.0,<ref name=nasa_ames/> this star is too faint to be seen with the naked eye.


==Planetary system==
==Planetary system==
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| semimajor = 0.0937
| semimajor = 0.0937
| period = 9.61730282{{±|3.35e-5}}
| period = 9.61730282{{±|3.35e-5}}
| radius = 1.75
| radius = 0.173
}}
}}
{{OrbitboxPlanet
| exoplanet = b
| exoplanet = b
| mass = <6.8
| mass = <6.8
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{{reflist|refs=
{{reflist|refs=


<ref name="Gaia DR2">{{Cite Gaia DR2|2128013019361703936}}</ref>
<ref name="Gaia DR3">{{Cite Gaia DR3|2128013019361703936}}</ref>


}}
}}

Latest revision as of 19:59, 3 May 2024

Kepler-31
Observation data
Epoch J2000      Equinox J2000
Constellation [corvus][1]
Right ascension 19h 36m 05.5270s[2]
Declination +45° 51′ 11.108″[2]
Apparent magnitude (V) 14.0[3]
Characteristics
Spectral type G5[4]
Astrometry
Proper motion (μ) RA: −1.007(25) mas/yr[2]
Dec.: −7.439(23) mas/yr[2]
Parallax (π)0.6013 ± 0.0200 mas[2]
Distance5,400 ± 200 ly
(1,660 ± 60 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′ 11.108″.[2] With an apparent visual magnitude of 14.0,[3] this star is too faint to be seen with the naked eye.

Planetary system

[edit]

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
.04(unconfirmed) — 0.0937 9.61730282±3.35e-5 — — 0.173 RJ
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

[edit]
  1. ^ "Cygnus – constellation boundary", The Constellations, International Astronomical Union, retrieved 2011-12-15
  2. ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 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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