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Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 19h 04m 58.427s[1]
Declination +50° 02′ 25.25″[1]
Apparent magnitude (V) 13.4[2]
Proper motion (μ) RA: -2.4[1] mas/yr
Dec.: 11.2[1] mas/yr
Distance 1984+443
[3] ly
[3] pc)
Spectral type G0[2]
Mass 1.166±0.054 M
Radius 1.483±0.029 R
Temperature 5947±100 K
Metallicity [Fe/H] 0.07 (± 0.04) dex
Rotational velocity (v sin i) 2.7±0.5[4] km/s
Age 4.0±0.4 Gyr
Other designations
KIC 11804465, KOI-20, GSC 03549-00844, 2MASS J19045842+5002253[4]
Database references
KIC data

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


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.[5] Kepler-12 is located approximately 600 parsecs (2,000 light years) away from Earth. 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[edit]

The one currently known planet is a hot Jupiter with a radius 1.7 times that of Jupiter but less than half the mass.[6]

The Kepler-12 planetary system[6][5]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b 0.432+0.053
4.4379637±0.0000002 0 88.796+0.088


Coordinates: Sky map 19h 04m 58s, +50° 02′ 25″