XO-2Nb

XO-2Nb (XO-2Bb)

Exoplanet		List of exoplanets
Size comparison of XO-2 b (gray) with Jupiter.
Parent star
Star		XO-2N (XO-2B)
Constellation		Lynx
Right ascension	(α)	07h 48m 06.468s
Declination	(δ)	+50° 13′ 32.96″
Distance		483 ± 33  ly (148 ± 10  pc)
Spectral type		K0V
Orbital elements
Semi-major axis	(a)	0.0369 ± 0.002 AU
Eccentricity	(e)	0
Orbital period	(P)	2.61586178 ± 0.00000075d
Inclination	(i)	87.62 ± 0.51°
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 RJ
Density	(ρ)	820 kg m−3
Surface gravity	(g)	1.42 m/s²
Temperature	(T)	1208
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
Exoplanet Archive		data
Open Exoplanet Catalogue		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. This planet was found by transit method in 2007 by Burke et al. This was the second such planet found by the XO telescope.

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.

Coordinates: 07^h 48^m 07^s, +50° 13′ 33″

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