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XO-2Nb (XO-2Bb)

Extrasolar planet		List of extrasolar planets
File:Exoplanet Comparison XO-2 b.pngSize comparison of XO-2 b (gray) with Jupiter.
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 ofperiastron	(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 PlanetsEncyclopaedia		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.

File:XO-2 b rv.pdf

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[]

1. ↑ (1987). Identification of a Constellation From a Position. Publications of the Astronomical Society of the Pacific 99 (617): 695–699. Vizier query form
2. ↑ 2.0 2.1 Hog et al. (2000). Tyc 3413-5-1. The Tycho-2 Catalogue. Retrieved 2012-01-07.
3. ↑ 3.0 3.1 (2008). Improved Parameters for Extrasolar Transiting Planets. The Astrophysical Journal 677 (2): 1324–1342.
4. ↑ 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. ↑ 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.
6. ↑ 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″