HD 202206 c
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.
| Discovery | |
|---|---|
| Discovered by | Correia et al. |
| Discovery date | November 16, 2004 |
| Radial velocity | |
| Orbital characteristics | |
| 2.55 AU (381,000,000 km) | |
| Eccentricity | 0.267±0.021 |
| 1383.4±18.4 d | |
| 2,452,250 | |
| 78.99±6.65 | |
| Semi-amplitude | 42±1.5 |
| Star | HD 202206 |
The planet orbits 3.07 times further out and is 85% 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.
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