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Kepler-27 
Summary
Kepler-27 is a star in the northern constellation of Cygnus, the swan. It is located at the celestial coordinates: Right Ascension 19h 28m 56.81962s, Declination +41° 05′ 09.1405″.[2] With an apparent visual magnitude of 15.855,[3] this star is too faint to be seen with the naked eye.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus[1] |
| Right ascension | 19h 28m 56.81962s[2] |
| Declination | +41° 05′ 09.1405″[2] |
| Apparent magnitude (V) | 15.855[3] |
| Characteristics | |
| Spectral type | G5[4] |
| Astrometry | |
| Proper motion (μ) | RA: 2.171±0.033 mas/yr[2] Dec.: −0.324±0.031 mas/yr[2] |
| Parallax (π) | 0.9298 ± 0.0281 mas[2] |
| Distance | 3,500 ± 100 ly (1,080 ± 30 pc) |
| Details | |
| Mass | 0.9+0.03 −0.10[5] M☉ |
| Luminosity | 0.59[3] L☉ |
| Temperature | 5400[3] K |
| Metallicity [Fe/H] | 0.41[3] dex |
| Rotational velocity (v sin i) | 0.6[3] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
| KIC | data |
Planetary system edit
The planetary system of Kepler-27 comprising two small gas giants on eccentric orbits[5] was discovered in late 2011.[6] The planets Kepler-27b and Kepler-27c have equilibrium temperatures of 610 K and 481 K, respectively.[7] In 2021, a third, sub-Neptune-sized planet was confirmed, orbiting closer in than the other two planets.[8][9]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| d | — | — | 6.54629 | — | — | 0.2414 RJ |
| b | 0.1320±0.018 MJ | 0.118 | 15.3348 | — | — | 0.522±0.024 RJ |
| c | 0.0670±0.011 MJ | 0.191 | 31.3309 | — | — | 0.640±0.029 RJ |
References edit
- ^ "Cygnus – constellation boundary", The Constellations, International Astronomical Union, retrieved 2011-12-15
- ^ 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 f Kepler-27b, NASA Ames Research Center, archived from the original on 2012-05-03, retrieved 2011-12-06
- ^ Schneider, Jean, "Star: Kepler-27", Extrasolar Planets Encyclopaedia, archived from the original on 2012-04-26, retrieved 2011-12-06
- ^ a b Hadden, Sam; Lithwick, Yoram (2017), "Kepler Planet Masses and Eccentricities from TTV Analysis", The Astronomical Journal, 154 (1): 5, arXiv:1611.03516, Bibcode:2017AJ....154....5H, doi:10.3847/1538-3881/aa71ef, S2CID 118936786
- ^ Steffen, Jason H.; Fabrycky, Daniel C.; Ford, Eric B.; Carter, Joshua A.; Desert, Jean-Michel; Fressin, Francois; Holman, Matthew J.; Lissauer, Jack J.; Moorhead, Althea V.; Rowe, Jason F.; Ragozzine, Darin; Welsh, William F.; Batalha, Natalie M.; Borucki, William J.; Buchhave, Lars A.; Bryson, Steve; Caldwell, Douglas A.; Charbonneau, David; Ciardi, David R.; Cochran, William D.; Endl, Michael; Everett, Mark E.; Gautier III, Thomas N.; Gilliland, Ron L.; Girouard, Forrest R.; Jenkins, Jon M.; Horch, Elliott; Howell, Steve B.; Isaacson, Howard; et al. (2012), Transit Timing Observations from Kepler: III. Confirmation of 4 Multiple Planet Systems by a Fourier-Domain Study of Anti-correlated Transit Timing Variations, arXiv:1201.5412, Bibcode:2012MNRAS.421.2342S, doi:10.1111/j.1365-2966.2012.20467.x, S2CID 11898578
- ^ a b Furlan, E.; Howell, S. B. (2017), "The Densities of Planets in Multiple Stellar Systems", The Astronomical Journal, 154 (2): 66, arXiv:1707.01942, Bibcode:2017AJ....154...66F, doi:10.3847/1538-3881/aa7b70, S2CID 28833730
- ^ Valizadegan, Hamed; Martinho, Miguel J. S. (February 2022). "ExoMiner: A Highly Accurate and Explainable Deep Learning Classifier That Validates 301 New Exoplanets". The Astrophysical Journal. 926 (2): 120. arXiv:2111.10009. Bibcode:2022ApJ...926..120V. doi:10.3847/1538-4357/ac4399. S2CID 244954905.
- ^ a b "Kepler-27". NASA Exoplanet Archive. Retrieved 7 November 2022.