KELT-3b

KELT-3b is an extrasolar planet orbiting the F-type main-sequence star KELT-3 690 light years in the zodiac constellation Leo. It was discovered in 2013 by KELT's telescope in Arizona.

KELT-3b

KELT-3b compared to Jupiter
Discovery
Discovered by	Pepper et al. 2013
Discovery date	2013
Detection method	Transit
Orbital characteristics
Semi-major axis	0.04120 ± 0.00067[1]AU
Eccentricity	0.202[1]
Orbital period (sidereal)	2.7033902 d[1]
Inclination	84.25+0.67 −0.64°[1]
Star	KELT-3
Physical characteristics
Mean radius	1.56±0.11RJ[2]
Mass	1.94±0.33MJ[2]
Temperature	2132±133[3]

Properties

This planet has 44% more mass than Jupiter, but has expanded to 1.34 times the radius of the latter. It has a temperature of 1,811 K, which gives it a Hot Jupiter class. KELT-3b has a lower density than Jupiter, and completes a revolution in less in 3 days. This corresponds with an orbital distance of 0.04 AU, which is 10 times closer than Mercury (planet) orbits the Sun.

The planetary equilibrium temperature is 1829±42 K, but measured temperature is hotter at 2132±133 K.^[3] The radiation of the moderately active host star KELT-3 do not produce a detectable ionization and consequent Lyman-alpha line emission in the atmosphere of the KELT-3b. ^[4]

Discovery

KELT-3b was discovered in 2013. The light curves and parameters of both the planet and the star were observed. The paper also states that there is uncertainty about the system’s^{[further explanation needed]} age.^[1]