55 Cancri e

55 Cancri e (55 Cnc e) is a super-Earth of about 8 Earth masses, orbiting a K-type star, but close to the star with an orbital period of about 18 hours (but was initially thought to have a period of 2.8 days). Its determined density is based on estimates of the host star's mass and radius along with data from observed transits and the star's radial velocity, yielding a radius of roughly 2 Earth radii and a density slightly (5%-10%) more than Earth's. Given its proximity to he star, the temperature of the star-facing side has been calculated to be more than 3000 K. Characteristics:

• Host star: 55 Cancri A (55 Cnc A).
• Discovery: by the radial velocity method in 2004.
• 13 pc - distance.
• 0.015 AU - orbital radius.
• 17.7 hours - orbital period.
• 1.9 - radius in Earth radii.
• 8 - Earth masses.
• 3771 K - predicted day-side temperature.