astro.wikisort.org - Meteorite
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 |
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] REarth |
| Mass | 35+18 −28[1] MEarth |
Mean density | 0.60+0.26 −0.56 g cm−3 |
| Temperature | 584[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]
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.
References
- Weiss, Lauren M; et al. (2013). "The Mass of KOI-94d and a Relation for Planet Radius, Mass, and Incident Flux". The Astrophysical Journal. 768: 14. arXiv:1303.2150. Bibcode:2013ApJ...768...14W. doi:10.1088/0004-637X/768/1/14.
- Morton, Timothy D.; et al. (2016). "False Positive Probabilities for Allkeplerobjects of Interest: 1284 Newly Validated Planets and 428 Likely False Positives". The Astrophysical Journal. 822 (2): 86. arXiv:1605.02825. Bibcode:2016ApJ...822...86M. doi:10.3847/0004-637X/822/2/86.
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