| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Draco |
| Right ascension | 19 04 58.4221 |
| Declination | +50° 02′ 25.272″ |
| Apparent magnitude (V) | 13.4 |
| Astrometry | |
| Proper motion (μ) | RA: 3.070(11) mas/yr Dec.: 3.211(11) mas/yr |
| Parallax (π) | 1.1351 ± 0.0093 mas |
| Distance | 2,870 ± 20 ly (881 ± 7 pc) |
| Characteristics | |
| Spectral type | G0 |
| Details | |
| Mass | 1.166±0.054 M☉ |
| Radius | 1.483±0.029 R☉ |
| Temperature | 5947±100 K |
| Metallicity | 0.07 (± 0.04) dex |
| Rotational velocity (v sin i) | 2.7±0.5 km/s |
| Age | 4.0±0.4 Gyr |
| Other designations | |
| KOI-20, KIC 11804465, GSC 03549-00844, 2MASS J19045842+5002253 | |
| Database references | |
| SIMBAD | data |
| KIC | data |
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. Kepler-12 is located approximately 881 parsecs (2,870 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.
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.
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.
| 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
- ^ 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.
- ^ "Notes on Kepler-12 b". Extrasolar Planets Encyclopaedia. Retrieved 29 December 2016.
- ^ "Kepler-12". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 29 December 2016.
- ^ 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.
- ^ 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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