K2-128 b
Orbiting K2-128
K2-128 b is an exoplanet orbiting the star K2-128, discovered in 2017 using the Transit method. It is a Earth-sized world.
Radius
1.42
Earth radii
Mass (est.)
2.77
Earth masses
Orbital Period
5.7
days
Distance
114.6
parsecs
Radius (Earth radii)
1.42
Mass (Earth masses)
2.77
Estimated
Equilibrium Temperature
Unknown
Parameter source: Dressing et al. 2017
Orbital Period
5.676+0.000−0.000days
Semi-Major Axis
0.0560+0.0020−0.0020au
Eccentricity
0.2300+0.2202−0.1937
Argument of Periastron
62.5+71.3−113.7deg
Distance from Earth
114.6 pc (~374 ly)
Spectral Type
Unknown
Temperature
4470 K
Mass (Solar)
0.71 M☉
Radius (Solar)
0.78 R☉
Luminosity
Unknown
Planets in System
1
Stars in System
1
Coordinates (RA, Dec)
204.4377°, -8.5971°
Discovery Method
Transit
Discovery Year
2017
Source ID: K2-128 b
K2-128 b orbits K2-128 and was reported in 2017 and was detected with the Transit method.
Published measurements list a radius of 1.42 Earth radii, a mass of 2.77 Earth masses (estimated), and an orbital period of 5.68 days.
Catalog data places the system at about 114.6 parsecs from Earth and 1 known planet in the system.
Host star
Explore the stellar record for this system to compare temperature, spectral type, and known planets.
Open K2-128