HD 147506

Starbox begin
name = HD 147506 Starbox observe
epoch = J2000.0
constell = Hercules
ra = RA|16|20|36.36
dec = DEC|+41|02|53.1
appmag_v = +8.7 Starbox character
class = F8V
b-v = ?
u-b = ?
variable = none Starbox astrometry
radial_v = ?
prop_mo_ra = −10.64
prop_mo_dec = −29.70
parallax = 7.39
p_error = 0.88
dist_ly = 440
dist_pc = 135
absmag_v = +3.04 Starbox detail
age = 2.7 ± 1.4 × 10⁹
metal = +0.12 ± 0.08
mass = 1.298 ± 0.1
radius = 1.412 ± 0.04
gravity = 4.33
rotation = ?
luminosity = 2.79
temperature = 6290 ± 110 Starbox catalog
names = HD 147506, HIP 80076 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.

Planetary system

Orbiting the star is HAT-P-2b, the most massive transiting extrasolar planet yet discovered. [ [http://exoplanet.eu/planet.php?p1=HAT-P-2&p2=b Extrasolar Planet Encyclopaedia] ] At 9.04 "M"_J and an estimated surface temperature of ~900 kelvins, on a 5.6 day orbit, this planet is unlike any previously discovered transiting planet. The planet has a large mass (nine times the mass of Jupiter), and a surface gravity 25 times that exerted by the Earth. Its 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. [Alan MacRobert, “New Worlds roundup,” Sky and Telescope, August 2007, pg 15.]

The planet was discovered by the HATNet Project and the researchers there believed 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. [ [http://oklo.org/?p=208 Systemic Planetary Simulation] ]

* Name HD 147506 b
* Mass: 9.04 (± 0.50) "M"_J
* Semi major axis: 0.0685 AU
* Orbital period: 5.63341 (± 0.00013) days
* Eccentricity: 0.520 (± 0.010)
* Radius: 0.982 (+0.038-0.105) "R"_J
* Inclination: 90 (± 0.8) deg

ee also

*List of stars with confirmed extrasolar planets

References