| Extrasolar planet | List of extrasolar planets | |
|---|---|---|
| File:Exoplanet Comparison XO-2 b.png | ||
| Parent star | ||
| Star | XO-2N (XO-2B) | |
| Constellation | Lynx[1] | |
| Right ascension | (α) | 07h 48m 06.468s [2] |
| Declination | (δ) | +50° 13′ 32.96″ [2] |
| Distance | 483 ± 33 [3] ly (148 ± 10 [3] pc) | |
| Spectral type | K0V [4] | |
| Orbital elements | ||
| Semimajor axis | (a) | 0.0369 ± 0.002 AU |
| Eccentricity | (e) | 0 |
| Orbital period | (P) | 2.61586178 ± 0.00000075[5] d |
| Inclination | (i) | 87.62 ± 0.51[5]° |
| Argument of periastron |
(ω) | ?° |
| Time of periastron | (T0) | 2454147.74902 ± 0.00002 JD |
| Semi-amplitude | (K) | 80.2 m/s |
| Physical characteristics | ||
| Mass | (m) | 0.57 ± 0.06 MJ |
| Radius | (r) | 0.973 ± 0.03 Template:Jupiter radius |
| Density | (ρ) | 820 kg m-3 |
| Surface gravity | (g) | 1.42 m/s² |
| Temperature | (T) | 1208 K |
| Discovery information | ||
| Discovery date | 2007 | |
| Discoverer(s) | Burke et al. | |
| Discovery method | Transit (including secondary eclipse) | |
| Other detection methods | Radial velocity | |
| Discovery status | Published | |
| Database references | ||
| Extrasolar Planets Encyclopaedia | data | |
| SIMBAD | data | |
XO-2Nb (or rarely XO-2Bb) is an extrasolar planet orbiting the star XO-2N, the fainter component of XO-2 wide binary star in the constellation Lynx.[6] This planet was found by transit method in 2007 by Burke et al. This was the second such planet found by the XO telescope.
The radial velocity of XO-2 over time, caused by the presence of XO-2 b.
Like most planets found by the transit method, it is a roughly Jupiter sized planet that orbits very close to its host star; in this case, it has a surface temperature of about 1200 K, so it belongs to a group of exoplanets known as hot Jupiters. The planet takes 2.6 days to orbit the star at the average distance of 0.0369 AU. The planet has mass of 57% of Jupiter and radius of 97% of Jupiter. The radius is relatively large for its mass, probably due to its intense heating from its nearby star that bloats the planet’s atmosphere. The large radius for its mass gives a low density of 820 kg/m3.[4]
See also[]
- XO Telescope
References[]
- ↑ (1987). Identification of a Constellation From a Position. Publications of the Astronomical Society of the Pacific 99 (617): 695–699. Vizier query form
- ↑ 2.0 2.1 Hog et al. (2000). Tyc 3413-5-1. The Tycho-2 Catalogue. Retrieved 2012-01-07.
- ↑ 3.0 3.1 (2008). Improved Parameters for Extrasolar Transiting Planets. The Astrophysical Journal 677 (2): 1324–1342.
- ↑ 4.0 4.1 (2007). XO-2b: Transiting Hot Jupiter in a Metal-rich Common Proper Motion Binary. The Astrophysical Journal 671 (2): 2115–2128.
- ↑ 5.0 5.1 (2011). Gran Telescopio Canarias OSIRIS transiting exoplanet atmospheric survey: detection of potassium in XO-2b from narrowband spectrophotometry. Astronomy and Astrophysics 527.
- ↑ XO-2 b SIMBAD query result:XO-2b -- Extra-solar Planet Candidate. Centre de Données astronomiques de Strasbourg. Retrieved 2009-04-26.
External links[]
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Coordinates: Sky map 07h 48m 07s, +50° 13′ 33″
