Mega-Earth

Size comparison of Kepler-10c, a Mega-Earth, with Earth and Neptune

A mega-Earth is a massive terrestrial exoplanet that is at least ten times the mass of Earth. Mega-Earths are substantially more massive than super-Earths (terrestrial and ocean planets with masses around 5–10 Earths). The term "mega-Earth" was first coined in 2014, when Kepler-10c was revealed to be a Neptune-mass planet with a density considerably greater than that of Earth.^[1][2]

List of Mega-Earth exoplanets

Planet	Star system	Location		Distance	Constellation	Mass (MEarth)	Size (REarth)	Density (g/cm^3)	Surface gravity	Orbit		Notes
		Right Ascension	Declination							Period	Size (AU)
Kepler-10c	Kepler-10	19^h 02^m 43^s	+50° 14′ 29″	584 ly (179 pc)	Draco	17.2	2.34	7.100		45.3 days	0.24
K2-3d	K2-3	11^h 29^m 20.39^s	−01° 27′ 17.2″	137 ly (42 pc)	Leo	7.50	1.61	11.7		44.6 days	0.2
BD+20594b	BD+20 594	03^h 34^m 36.23^s	+20° 35′ 57.2″	496.08 ly (152.10 pc)	Aries	16.3	2.23	7.890		41.69 days	0.241

References

1. Sasselov, Dimitar (2 June 2014) Exoplanets: From Exhilarating to Exasperating, 22:59, Kepler-10c: The "Mega-Earth", YouTube
2. "Astronomers Find a New Type of Planet: The "Mega-Earth"2014-14". www.cfa.harvard.edu/.

See also