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From Wikipedia, the free encyclopedia
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.[2] This planet was found by the transit method in 2007 by Burke et al. This was the second such planet found by the XO telescope.
![]() Size comparison of XO-2 b (gray) with Jupiter. | |
Discovery | |
---|---|
Discovered by | Burke et al. |
Discovery date | 2007 |
Transit (including secondary eclipse) | |
Orbital characteristics | |
0.0369 ± 0.002 AU (5,520,000 ± 300,000 km) | |
Eccentricity | 0 |
2.61586178 ± 0.00000075[1] d | |
Inclination | 87.62 ± 0.51[1] |
2454147.74902 ± 0.00002 | |
? | |
Semi-amplitude | 80.2 |
Star | XO-2N (XO-2B) |
Physical characteristics | |
0.973 ± 0.03 RJ | |
Mass | 0.57 ± 0.06 MJ |
Mean density | 0.82 g/cm3[citation needed] |
1.42 m/s2 (0.145 g0)[citation needed] | |
Temperature | 1,208 K (935 °C) |
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.[3]