HD 202206 b
| 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) | 0.83[1] AU |
| Eccentricity | (e) | 0.435 ± 0.001[1] |
| Orbital period | (P) | 255.87 ± 0.06[1] d |
| Argument of periastron |
(ω) | 161.18 ± 0.3[1]° |
| Physical characteristics | ||
| Minimum mass | (m sin i) | 17.4[1] MJ |
| Discovery information | ||
| Discovery date | April 15, 2000[2] | |
| Discoverer(s) | Mayor et al. | |
| Discovery method | Doppler spectroscopy | |
| Discovery site |  France | |
| Discovery status | Confirmed | |
HD 202206 b is a substellar object orbiting the star HD 202206 approximately 151 light-years away in the constellation of Capricornus. The classification of this object as an extrasolar planet or a brown dwarf is currently unclear.[1] With a mass at least 17.4 times that of Jupiter, it exceeds the limit (approximately 13 Jupiter masses) required for an object to sustain deuterium fusion in its core. The deuterium fusion criterion is used by the IAU's Working Group on Extrasolar Planets to define the boundary between giant planets and brown dwarfs, so in this view HD 202206 b is a brown dwarf.[3] On the other hand, simulations of planet formation by core accretion show that objects of up to 25-30 Jupiter masses can be produced in this way, and therefore the object can potentially be regarded as a planet.[4][5]
References
- 1 2 3 4 5 6 Correia, A.; Udry, S.; Mayor, M.; Laskar, J.; Naef, D.; Pepe, F.; Queloz, D.; Santos, N. C.; et al. (2005). "The CORALIE survey for southern extra-solar planets. XIII. A pair of planets around HD202206 or a circumbinary planet?" (abstract). Astronomy and Astrophysics 440 (2): 751–758. arXiv:astro-ph/0411512. Bibcode:2005A&A...440..751C. doi:10.1051/0004-6361:20042376.
- ↑ "Exoplanets Galore!" (Press release). Garching, Germany: European Southern Observatory. April 15, 2000. Retrieved December 30, 2012.
- ↑ "Definition of a "Planet"". Working Group on Extrasolar Planets (WGESP) of the International Astronomical Union. Retrieved 2009-07-04.
- ↑ Mordasini, C.; Alibert; Benz; Naef; et al. (2007). "Giant Planet Formation by Core Accretion". arXiv:0710.5667v1 [astro-ph].
- ↑ Udry, S.; Mayor, M.; Naef, D.; Pepe, F.; Queloz, D.; Santos, N. C.; Burnet, M.; et al. (2002). "The CORALIE survey for southern extra-solar planets VIII. The very low-mass companions of HD 141937, HD 162020, HD 168443, HD 202206: Brown dwarfs or "superplanets"?" (abstract). Astronomy and Astrophysics 390 (1): 267–279. arXiv:astro-ph/0202458. Bibcode:2002A&A...390..267U. doi:10.1051/0004-6361:20020685.
Coordinates: 
21h 14m 57.79s, −20° 47′ 20.1″