Kepler-12 is a star with a transiting planet Kepler-12b in a 4-day orbit.
| 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] |
| Distance | 2,870 ± 20 ly (881 ± 7 pc) |
| Characteristics | |
| Spectral type | G0[2] |
| Details[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[3] km/s |
| Age | 4.0±0.4 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| KIC | data |
Characteristics
editKepler-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
editThe one currently known planet is a hot Jupiter with a radius 1.7 times that of Jupiter but less than half the mass.[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 |
References
edit- ^ 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.
- ^ a b c d e "Notes on Kepler-12 b". Extrasolar Planets Encyclopaedia. Retrieved 29 December 2016.
- ^ a b "Kepler-12". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 29 December 2016.
- ^ 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.
- ^ 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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