Astronomy:Kepler-20d
From HandWiki
 Artist's conception illustrates Kepler-22b | |
| Discovery | |
|---|---|
| Discovered by | Kepler team |
| Discovery date | 20 December 2011 |
| Transit (Kepler Mission) | |
| Orbital characteristics[1] | |
| 0.3474 ± 0.0067 AU (51,970,000 ± 1,000,000 km) | |
| Eccentricity | <0.082 |
| Orbital period | 77.611455(96) d |
| Inclination | 89.708°+0.17° −0.053° |
| Star | Kepler-20 (KOI-070) |
| Physical characteristics[1] | |
| Mean radius | 2.606+0.053 −0.039 R⊕ |
| Mass | 13.4+3.7 −3.6 M⊕ |
| Mean density | 4.1+1.1 −1.2 g⋅cm−3 |
| Physics | 430±6 K (157 °C; 314 °F, equilibrium) |
Kepler-20d is an exoplanet orbiting Kepler-20. It has a mass and radius similar to Neptune. Despite being the furthest planet from the star, it has an orbit similar to Mercury, meaning that it is a hot Neptune. Along with the other four planets in the system, Kepler-20d was announced on December 20, 2011.
References
- ↑ 1.0 1.1 Bonomo, A. S. et al. (September 2023). "Cold Jupiters and improved masses in 38 Kepler and K2 small planet systems from 3661 HARPS-N radial velocities. No excess of cold Jupiters in small planet systems". Astronomy & Astrophysics 677: A33. doi:10.1051/0004-6361/202346211. Bibcode: 2023A&A...677A..33B.
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