Astronomy:Kepler-12
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Draco |
| Right ascension | 19h 04m 58.4221s[1] |
| Declination | +50° 02′ 25.271″[1] |
| Apparent magnitude (V) | 13.4[2] |
| Astrometry | |
| Proper motion (μ) | RA: 3.053±0.025[1] mas/yr Dec.: 3.235±0.024[1] mas/yr |
| Parallax (π) | 1.1057 ± 0.0125[1] mas |
| Distance | 2,950 ± 30 ly (900 ± 10 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 |
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 900 parsecs (2,950 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
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]
| 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
- ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 "Notes on Kepler-12 b". Extrasolar Planets Encyclopaedia. https://exoplanet.eu/catalog/kepler_12_b--939/.
- ↑ 3.0 3.1 "Kepler-12". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-12.
- ↑ 4.0 4.1 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. doi:10.1088/0067-0049/197/1/9. Bibcode: 2011ApJS..197....9F.
- ↑ 5.0 5.1 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. doi:10.1088/0004-637X/804/2/150. Bibcode: 2015ApJ...804..150E.
Coordinates: 
19h 04m 58s, +50° 02′ 25″
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