Kepler-1229: Difference between revisions
MarioProtIV (talk | contribs) Undid revision 730571639 by Lithopsian (talk) how is that WP:OR? it is a ref to a paper explaining the respective temperatures for a red dwarf spectral classes. |
Lithopsian (talk | contribs) Tag spectral type as dubious |
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| class= M0V<ref name=apj698_1_519>{{Cite journal | last1=Kaltenegger | first1=Lisa | last2=Traub | first2=Wesley A. | title=Transits of Earth-like Planets | journal=The Astrophysical Journal | volume=698 | issue=1 | pages=519–527 |date=June 2009 | doi=10.1088/0004-637X/698/1/519 | bibcode=2009ApJ...698..519K |arxiv = 0903.3371 }} See red dwarf characteristics table near bottom of paper. The temperature of Kepler-1229 is 3784 K, which is consistent with an M0V class red dwarf star.</ref> |
| class= M0V<ref name=apj698_1_519>{{Cite journal | last1=Kaltenegger | first1=Lisa | last2=Traub | first2=Wesley A. | title=Transits of Earth-like Planets | journal=The Astrophysical Journal | volume=698 | issue=1 | pages=519–527 |date=June 2009 | doi=10.1088/0004-637X/698/1/519 | bibcode=2009ApJ...698..519K |arxiv = 0903.3371 }} See red dwarf characteristics table near bottom of paper. The temperature of Kepler-1229 is 3784 K, which is consistent with an M0V class red dwarf star.</ref> |
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Revision as of 10:57, 20 July 2016
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h 49m 56.81s[1] |
| Declination | +46° 59′ 48.2″[1] |
| Apparent magnitude (V) | 14.474[citation needed] |
| Characteristics | |
| Spectral type | M0V[2][dubious – discuss] |
| Astrometry | |
| Distance | 770[1] ly (236[1] pc) |
| Details | |
| Mass | 0.54 ± 0.3[1] M☉ |
| Radius | 0.51 ± 0.03[1] R☉ |
| Surface gravity (log g) | 4.75+0.029 −0.023[1] cgs |
| Temperature | 3784 ± 39[1] K |
| Metallicity [Fe/H] | –0.06 ± 0.1[1] dex |
| Age | 3.72+5.32 −2.07[1] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Kepler-1229 is a red dwarf star located about 770 light-years (240 pc) away from the Earth in the constellation of Cygnus. It is known to host a super-Earth exoplanet that orbits within the habitable zone, discovered in 2016.
Nomenclature and history
Prior to Kepler observation, Kepler-1229 had the 2MASS catalogue number 2MASS J19495680+4659481. In the Kepler Input Catalog it has the designation of KIC 10027247, and when it was found to have a transiting planet candidate it was given the Kepler object of interest number of KOI-2418.
The star's planetary companion was discovered by NASA's Kepler Mission, a mission tasked with discovering planets in transit around their stars. The transit method that Kepler uses involves detecting dips in brightness in stars. These dips in brightness can be interpreted as planets whose orbits move in front of their stars from the perspective of Earth. The name Kepler-1229 derives directly from the fact that the star is the catalogued 1,229th star discovered by Kepler to have confirmed planets.
The designation b, derives from the order of discovery. The designation of b is given to the first planet orbiting a given star, followed by the other lowercase letters of the alphabet.[3] In the case of Kepler-1229, there was only one planet, so only the letter b is used.
Stellar characteristics
Kepler-1229 is a M-type star that is approximately 54% the mass of and 51% the radius of the Sun. It has a surface temperature of 3784 K and is roughly 3.72 billion years old.[1] In comparison, the Sun is about 4.6 billion years old[4] and has a surface temperature of 5778 K.[5]
The star's apparent magnitude, or how bright it appears from Earth's perspective, is 15.474. Therefore, it is too dim to be seen with the naked eye.
Planetary system
The star is known to host one planet orbiting in the habitable zone. It is a super-Earth and is 40% larger than Earth.[1] It is likely a rocky planet.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 1.8–2.7 M🜨 | 0.2896 | 86.829 | — | 87–89° | 1.40+0.11 −0.13 R🜨 |
References
- ^ a b c d e f g h i j k l m "NASA Exoplanet Archive". NASA Exoplanet Science Institute. 10 May 2016. Retrieved 2016-05-11.
- ^ Kaltenegger, Lisa; Traub, Wesley A. (June 2009). "Transits of Earth-like Planets". The Astrophysical Journal. 698 (1): 519–527. arXiv:0903.3371. Bibcode:2009ApJ...698..519K. doi:10.1088/0004-637X/698/1/519. See red dwarf characteristics table near bottom of paper. The temperature of Kepler-1229 is 3784 K, which is consistent with an M0V class red dwarf star.
- ^ Hessman, F. V.; Dhillon, V. S.; Winget, D. E.; Schreiber, M. R.; Horne, K.; Marsh, T. R.; Guenther, E.; Schwope, A.; Heber, U. (2010). "On the naming convention used for multiple star systems and extrasolar planets". arXiv:1012.0707 [astro-ph.SR].
- ^ Fraser Cain (16 September 2008). "How Old is the Sun?". Universe Today. Retrieved 19 February 2011.
- ^ Fraser Cain (15 September 2008). "Temperature of the Sun". Universe Today. Retrieved 19 February 2011.
