Kepler-277 is a large yellow star about 961 ± 10 parsecs (3,134 ± 33 ly) away in the constellation of Lyra. It is 1.69 R☉ and 1.12 M☉, with a temperature of 5946 K, a metallicity of -0.315 [Fe/H], and an unknown age.[3] For comparison, the Sun has a temperature of 5778 K, a metallicity of 0.00 [Fe/H], and an age of about 4.5 billion years. The large radius in comparison to its mass and temperature suggest that Kepler-277 could be a subgiant star.
Planetary system
Kepler-277 hosts two exoplanets, detected in 2014 via the transit method.[3] Named Kepler-277b and Kepler-277c, they are super-Earths, notable for their unusually high densities.[5]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 87.3+41.7 −39.9 M🜨 |
0.136 | 17.324 | — | — | 2.92+0.73 −0.63 R🜨 |
| c | 64.2+18.1 −15.7 M🜨 |
0.209 | 33.006 | — | — | 3.36+0.83 −0.72 R🜨 |
See also
References
- ^ "Finding the constellation which contains given sky coordinates". djm.cc. 2 August 2008.
- ^ 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 "Kepler-277". NASA Exoplanet Archive. Retrieved 21 October 2023.
- ^ "Kepler-277". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 21 October 2023.
- ^ Futó, P.; et al. (March 2020). Kepler-277 b: A Supermassive Terrestrial Exoplanet in the Kepler-277 Planetary System (PDF). 51st Lunar and Planetary Science Conference. Lunar and Planetary Institute. Bibcode:2020LPI....51.1055F.
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