HD 202206 c
| Exoplanet | List of exoplanets | |
|---|---|---|
| Parent star | ||
| Star | HD 202206 | |
| Constellation | Capricornus | |
| Right ascension | (α) | 21h 14m 57.79s |
| Declination | (δ) | −20° 47′ 20.1″ |
| Distance | 151.14 ly (46.3 pc) | |
| Spectral type | G6V | |
| Orbital elements | ||
| Semi-major axis | (a) | 2.55 AU |
| Eccentricity | (e) | 0.267±0.021 |
| Orbital period | (P) | 1383.4±18.4 d |
| Argument of periastron |
(ω) | 78.99±6.65° |
| Time of periastron | (T0) | 2,452,250 JD |
| Semi-amplitude | (K) | 42±1.5 m/s |
| Physical characteristics | ||
| Minimum mass | (m sin i) | 2.44 MJ |
| Discovery information | ||
| Discovery date | November 16, 2004 | |
| Discoverer(s) | Correia et al. | |
| Discovery method | Radial velocity | |
| Discovery status | Published | |
HD 202206 c is an extrasolar planet discovered on November 16, 2004, using long-term observation of a formerly unconfirmed second planet after the discovery of a brown dwarf (first companion) around the star. This was the first circumbinary planet to be found around a main sequence star.
The planet orbits 3.07 times further out and is 7.13 times less massive than the first companion, having a semi-amplitude of only 42 m/s. Its mass is 2.44 times that of Jupiter and its diameter is roughly the same size as Jupiter's. The orbital resonance of the planet orbiting the brown dwarf is 5:1. The eccentricity of the planet is higher than that of all the planets and dwarf planets in the Solar System except Eris, which has an eccentricity of 0.44.
References
- Correia; et al. (2005). "A pair of planets around HD 202206 or a circumbinary planet?". Astronomy & Astrophysics 440 (2): 751–758. arXiv:astro-ph/0411512. Bibcode:2005A&A...440..751C. doi:10.1051/0004-6361:20042376.
External links
Coordinates: 
21h 14m 57.79s, −20° 47′ 20.1″