HAT-P-13b

HAT-P-13b is an extrasolar planet approximately 700 light-years away in the constellation Ursa Major. The planet was discovered when it transited across its sun, HAT-P-13. This planet is a hot Jupiter with 0.851 times the mass of Jupiter and 1.28 radius. The planet has a lower mass, but its overall size is larger than Jupiter.^[1]

HAT-P-13b

Size comparison of HAT-P-13b with Jupiter.
Discovery
Discovered by	Bakos et al.[1]
Discovery site	United States
Discovery date	21 July 2009
Detection method	Transit Radial velocity
Orbital characteristics
Semi-major axis	0.0426 AU (6,370,000 km)
Eccentricity	0.021
Orbital period (sidereal)	2.91626 d
Inclination	83.4
Argument of periastron	181
Star	HAT-P-13
Physical characteristics
Mean radius	1.28 RJ
Mass	0.851 MJ

The study in 2012, utilizing a Rossiter–McLaughlin effect, have determined the planetary orbit is probably aligned with the rotational axis of the star, misalignment equal to 1.9±8.6°.^[2]