HD 80606 b
HD 80606 b (also Struve 1341 Bb or HIP 45982 b) is an eccentric hot Jupiter 217 light-years from the Sun in the constellation of Ursa Major. HD 80606 b was discovered orbiting the star HD 80606 in April 2001 by a team led by Michel Mayor and Didier Queloz. With a mass 4 times that of Jupiter, it is a gas giant. Because the planet transits the host star its radius can be determined using the transit method, and was found to be about the same as Jupiter's. Its density is slightly less than Earth's. It has an extremely eccentric orbit like a comet, with its orbit taking it very close to its star and then back out very far away from it every 111 days.
Computer simulation of weather systems on HD 80606 b, to scale with Jupiter | |
| Discovery | |
|---|---|
| Discovered by | Geneva Extrasolar Planet Search |
| Discovery site | Haute-Provence Observatory |
| Discovery date | 4 April 2001 |
| Radial velocity | |
| Orbital characteristics | |
| Apastron | 0.8821 AU (131,960,000 km) |
| Periastron | 0.0309 AU (4,620,000 km) |
| 0.4565 ± 0.0053 AU (68,290,000 ± 790,000 km) | |
| Eccentricity | 0.93226+0.00064 −0.00069 |
| 111.43670±0.00040 d | |
Average orbital speed | 8.8 km/s – 47.3 km/s |
| Inclination | 89.232°±0.029° |
| 2,454,424.857 ± 0.05 | |
| 301.03°+0.20° −0.19° | |
| Semi-amplitude | 474.9+2.5 −2.7 m/s |
| Star | HD 80606 |
| Physical characteristics | |
Mean radius | 1.003±0.023 RJ |
| Mass | 4.116+0.097 −0.100 MJ |
Mean density | 5.06+0.38 −0.35 g/cm3 |
| 9.6 g | |
| 93+85 −35 h | |
| Temperature | <500 - 1400 K |
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