HAT-P-8b

HAT-P-8b
Exoplanet List of exoplanets

Size comparison of HAT-P-8b with Jupiter.
Parent star
Star GSC 02757-01152
Constellation Pegasus
Right ascension (α) 22h 52m 09.862s
Declination (δ) +35° 26′ 49.59″
Apparent magnitude (mV) 10.17
Distance750 ± 50 ly
(230 ± 15 pc)
Orbital elements
Semi-major axis(a) 0.0487 ± 0.00026 AU
Eccentricity (e) ~0
Orbital period(P) 3.07632 ± 0.000004 d
Orbital speed (υ) 173 km/s
Inclination (i) 87.5+1.9
−0.9°
Time of transit (Tt) 2,454,437.67582 ± 0.00034 JD
Physical characteristics
Mass(m)1.52+0.18
−0.16 MJ
Radius(r)1.5+0.08
−0.06 RJ
Discovery information
Discovery date December 5, 2008
Discoverer(s) HATNet Project
Discovery method Transit
Discovery status Unpublished
Database references
Extrasolar Planets
Encyclopaedia		data
SIMBADdata
Exoplanet Archivedata
Open Exoplanet Cataloguedata

HAT-P-8b is an extrasolar planet located approximately 750 light years away in the constellation of Pegasus, orbiting the 10th magnitude star GSC 02757-01152. This planet was discovered by transit on December 5, 2008. Despite the designation as HAT-P-8b, it is the 11th planet discovered by the HATNet Project. The mass of the planet is 50% more than Jupiter while the radius is also 50% more than Jupiter. The mass of this planet is exact since the inclination of the orbit is known, typical for transiting planets. This is a so-called “hot Jupiter” because this Jupiter-like gas giant planet orbits in a really close torch orbit around the star, making this planet extremely hot (in the order of a thousand kelvins). The distance from the star is roughly 20 times smaller than that of Earth from the Sun, which places the planet roughly 8 times closer to its star than Mercury is from the Sun. The “year” on this planet lasts only 3 days, 1 hour, 49 minutes, and 54 seconds, compared with Earth's 365 days, 6 hours, 9 minutes, and 10 seconds in a sidereal year.[1]

See also

References

External links

Media related to HAT-P-8 b at Wikimedia Commons

Coordinates: 22h 52m 09.862s, +35° 26′ 49.59″

This article is issued from Wikipedia - version of the 6/29/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.