| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Draco[1] |
| Right ascension | 19h 04m 58.4221s[2] |
| Declination | +50° 02′ 25.272″[2] |
| Apparent magnitude (V) | 13.4[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | G0[3] |
| Astrometry | |
| Proper motion (μ) | RA: 3.070(11)mas/yr[2] Dec.: 3.211(11)mas/yr[2] |
| Parallax (π) | 1.1351±0.0093 mas[2] |
| Distance | 2,870 ± 20 ly (881 ± 7 pc) |
| Details[3] | |
| 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 | |
| KOI-20,KIC 11804465,GSC 03549-00844,2MASS J19045842+5002253[4] | |
| Database references | |
| SIMBAD | data |
| KIC | data |
Kepler-12 is an earlyG-type to lateF-type star with atransiting planetKepler-12b in a 4-day orbit. The star lies within the constellationDraco and is located approximately 881parsecs (2,870light-years) away from Earth.
Kepler-12, known also as KIC 11804465 in theKepler Input Catalog, is an early G-type to late F-type star, about 4 billion years old. This corresponds strongly with a sunlikedwarf star nearing the end of themain sequence, which is about to become ared giant.[5] Kepler-12 is located approximately 881parsecs (2,870light-years) away from Earth.[2] The star also has anapparent magnitude of 13.438, which means that it cannot be seen from Earth with the unaided eye.[3]
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 theSun's radius.[3]
The only currently known planet, b, is ahot Jupiter with a radius 1.7 times that ofJupiter but less than half the mass.[6] It exhibits a pronounced radius anomaly, being significantly larger than predicted by standard models ofplanetary evolution for its level of stellar irradiation and mass. This suggests additional mechanisms contribute to its inflated radius, such as lowerheavy-element content or internal heat sources.[5]
| 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 |
