Kepler-89e
Exoplanet
From Wikipedia, the free encyclopedia
Kepler-89e, also known as KOI-94e, is an exoplanet in the constellation of Cygnus. It orbits Kepler-89.
| Discovery | |
|---|---|
| Discovered by | Lauren M. Weiss et al.[1] |
| Discovery date | 9 March 2013 |
| Transit method | |
| Orbital characteristics | |
| 0.3046 ± 0.0040 AU (45,570,000 ± 600,000 km)[1] | |
| Eccentricity | 0.019 ± 0.23[1] |
| 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 | |
| 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
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.
