Kepler-17b

Kepler-17b

Discovery
Discovered by	Aldo S. Bonomo et al.
Discovery date	25 October 2011
Detection method	Transit method
Orbital characteristics
Semi-major axis	0.0268 ± 0.0005 AU (4,009,000 ± 75,000 km)
Orbital period (sidereal)	1.4857108 ± 0.0000002 d
Inclination	87.22 ± 0.15
Star	Kepler-17
Physical characteristics
Mean radius	1.33 ± 0.04 RJ
Mass	2.47 ± 0.10 MJ
Mean density	1.30 ± 0.14 g/cm3 (0.0470 ± 0.0051 lb/cu in)
Surface gravity	3.54 ± 0.03 m/s2 (11.614 ± 0.098 ft/s2)
Temperature	2229+50 −58 K.

Kepler-17b's size relative to Earth (left) and Jupiter (right)

Kepler-17b is a planet in the orbit of star Kepler-17, first observed by the Kepler spacecraft observatory in 2011. Kepler-17b is a gas giant nearly 2.45 times the mass of Jupiter, and is sometimes described as a "super-Jupiter". The planet is likely to be tidally locked to the parent star. In 2015, the planetary nightside temperature was estimated to be equal to 2229⁺⁵⁰
₋₅₈ K.

The study in 2012, utilizing a Rossiter–McLaughlin effect, have determined the planetary orbit is probably aligned with the equatorial plane of the star, misalignment equal to 0±15°.