Kepler-89e

Kepler-89e, also known as KOI-94e, is an exoplanet in the constellation of Cygnus. It orbits Kepler-89.

Kepler-89e

Discovery
Discovered by	Lauren M. Weiss et al.[1]
Discovery date	9 March 2013
Detection method	Transit method
Orbital characteristics
Semi-major axis	0.3046 ± 0.0040 AU (45,570,000 ± 600,000 km)[1]
Eccentricity	0.019 ± 0.23[1]
Orbital period (sidereal)	54.32031 ± 0.00012[1] d
Inclination	89.76 ± 0.15[1]
Semi-amplitude	4.5+2.3 −3.5[1]
Star	Kepler-89
Physical characteristics
Mean radius	6.56 ± 0.62[1] R🜨
Mass	35+18 −28[1] M🜨
Mean density	0.60+0.26 −0.56 g cm−3
Temperature	584 K (311 °C; 592 °F)[1]

Physical properties

It is classed as a type III planet, making it cloudless and blue, and giving it the appearance of a larger version of Uranus and Neptune. It has a mass around 35 times that of Earth.^[1] It has a similar density to Saturn, 0.60 g/cm³,^[1] giving it a radius 6.56 times that of the Earth.^[1] It orbits an F-type main-sequence star at a distance of 0.305 astronomical units (au), with a period of 54.32031 days,^[1] making its orbit smaller than that of Mercury's. It has a very low eccentricity of 0.019.^[1] It has a temperature of 584 K.^[1]

Host star

Main article: Kepler-89

Kepler-89e orbits the star Kepler-89. Kepler-89 has a mass of 1.18 solar masses,^[2] and a radius of 1.32 solar radii.^[2] It is 3.3 billion years old, younger than the Sun,^[2] making its planets about 3,000,000,000 years old (3 Gyr). It has a temperature of 6,210 K,^[2] making it appear bright yellowish-white.