Kepler-89e

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	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[1]

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

Physical properties

It is a type III planet, making it cloudless and blue, making it look like 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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[Weiss-1] 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-2] 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.