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HD 147506
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HD 147506 is a magnitude 8.7 F8 dwarf star that is somewhat larger and hotter than our sun. The star is 440 light years from Earth and is positioned near the keystone of Hercules. It is estimated to be 2 to 3 billion years old.
[edit] Planetary system
Main article: HAT-P-2b
Orbiting the star is HAT-P-2b, the most massive transiting extrasolar planet yet discovered. [1] At 8.17 Mj and an estimated surface temperature of ~900 kelvin, on a 5.6 day orbit, this planet is unlike any previously discovered transiting planet. The planet has a large mass (eight times the mass of Jupiter), and a surface gravity 14 times that exerted by the Earth. It's orbital eccentricity is very large (e=0.5). Since tidal forces should have reduced the orbital eccentricity of this planet it is speculated that another massive planet found outside the orbit of HAT-P-2b is in orbital resonance with HAT-P-2b. [2]
The planet was discovered by the HATNet Project and the researchers there believe the planet to be 10-20% larger than Jupiter. This discovery is important as it provides further support for the existing theory of planetary structure. [3]
[edit] See also
* List of stars with confirmed extrasolar planets
[edit] References
1. ^ Extrasolar Planet Encyclopaedia
2. ^ Alan MacRobert, “New Worlds roundup,” Sky and Telescope, August 2007, pg 15.
3. ^ Systemic Planetary Simulation
Sirius This main sequence star-related article is a stub. You can help Wikipedia by expanding it.
Retrieved from "http://en.wikipedia.org/wiki/HD_147506"
Categories: Main sequence star stubs | HD and HDE objects | Hercules constellation | Type-F stars
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