HAT-P-2b
HAT-P-2b is a planet extrasolaire detected by the Harvard-Smithsonian Center for Astrophysics in May 2007. It orbits around HD 147506, a star of standard F8 (more massive and more heat that Sun) and located at 440 light-years in the constellation of Hercules. Seen ground, the planet passes in front of its sun every 5 days and 15 hours.
The Masse of planet is 8 times more important than Jupiter, but its ray corresponds to only 1.18 times that of Jupiter. The average density is thus similar to that of the Ground. Gravity on the surface would be 15 times more important than on our planet. Its orbit is very irregular: if this planet were in our Solar system, it would pass very close to the Sun at a distance equivalent to that of Mercure, to move away then until Mars. The temperature variations must thus be extreme on its surface.
One suggests, without having an formal evidence of it, that an additional planet disturbs HAT-P-2b.
External bonds
- Spaceflight Now carryforward
- Astronomers Find Super-massive Planet
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