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Kepler-12

Kepler-12
Observation data
Epoch J2000      Equinox J2000
Constellation Draco
Right ascension 19h 04m 58.4221s[1]
Declination +50° 02′ 25.272″[1]
Apparent magnitude (V) 13.4[2]
Astrometry
Proper motion (μ) RA: 3.070(11) mas/yr[1]
Dec.: 3.211(11) mas/yr[1]
Parallax (π)1.1351 ± 0.0093 mas[1]
Distance2,870 ± 20 ly
(881 ± 7 pc)
Characteristics
Spectral type G0[2]
Details[2]
Mass1.166±0.054 M☉
Radius1.483±0.029 R☉
Temperature5947±100 K
Metallicity [Fe/H]0.07 (± 0.04) dex
Rotational velocity (v sin i)2.7±0.5[3] km/s
Age4.0±0.4 Gyr
Other designations
KOI-20, KIC 11804465, GSC 03549-00844, 2MASS J19045842+5002253[3]
Database references
SIMBADdata
KICdata

Kepler-12 is a star with a transiting planet Kepler-12b in a 4-day orbit.

Characteristics

Kepler-12, known also as KIC 11804465 in the Kepler Input Catalog, is an early G-type to late F-type star. This corresponds strongly with a sunlike dwarf star nearing the end of the main sequence, and is about to become a red giant.[4] Kepler-12 is located approximately 881 parsecs (2,870 light-years) away from Earth.[1] The star also has an apparent magnitude of 13.438, which means that it cannot be seen from Earth with the unaided eye.[2]

The star is slightly more massive, slightly more iron-rich and slightly hotter than the Sun. However, Kepler-12 is larger, with a radius of 1.483 times the Sun's radius.[2]

Planetary system

The one currently known planet is a hot Jupiter with a radius 1.7 times that of Jupiter but less than half the mass.[5]

The Kepler-12 planetary system[5][4]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 0.432+0.053
−0.051 MJ 		0.0553+0.0010
−0.0012 		4.4379637±0.0000002 0 88.796+0.088
−0.074° 		1.754+0.031
−0.036 RJ

References

  1. ^ 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.
  2. ^ a b c d e "Notes on Kepler-12 b". Extrasolar Planets Encyclopaedia. Retrieved 29 December 2016.
  3. ^ a b "Kepler-12". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 29 December 2016.
  4. ^ a b Fortney, Jonathan J.; et al. (2011). "Discovery and Atmospheric Characterization of Giant Planet Kepler-12b: An Inflated Radius Outlier". The Astrophysical Journal Supplement Series. 197 (1) 9. arXiv:1109.1611. Bibcode:2011ApJS..197....9F. doi:10.1088/0067-0049/197/1/9.
  5. ^ a b Esteves, Lisa J.; Mooij, Ernst J. W. De; Jayawardhana, Ray (2015). "Changing Phases of Alien Worlds: Probing Atmospheres Of Kepler planets with High-Precision Photometry". The Astrophysical Journal. 804 (2). 150. arXiv:1407.2245. Bibcode:2015ApJ...804..150E. doi:10.1088/0004-637X/804/2/150.




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