Kepler-257 d
Orbiting Kepler-257
Kepler-257 d is an exoplanet orbiting the star Kepler-257, discovered in 2014 using the Transit method. It is a Neptune-sized world.
Radius
4.95
Earth radii
Mass (est.)
23.09
Earth masses
Orbital Period
24.7
days
Distance
780.3
parsecs
Radius (Earth radii)
4.95
Mass (Earth masses)
23.09
Estimated
Equilibrium Temperature
Unknown
Parameter source: Rowe et al. 2014
Orbital Period
24.665+0.000−0.000days
Semi-Major Axis
0.1600au
Distance from Earth
780.3 pc (~2545 ly)
Spectral Type
Unknown
Temperature
5180 K
Mass (Solar)
Unknown
Radius (Solar)
1.04 R☉
Luminosity
Unknown
Planets in System
3
Stars in System
1
Coordinates (RA, Dec)
297.3160°, 46.0233°
Discovery Method
Transit
Discovery Year
2014
Source ID: Kepler-257 d
Kepler-257 d orbits Kepler-257 and was reported in 2014 and was detected with the Transit method.
Published measurements list a radius of 4.95 Earth radii, a mass of 23.09 Earth masses (estimated), and an orbital period of 24.66 days.
Catalog data places the system at about 780.3 parsecs from Earth and 3 known planets in the system.
Host star
Explore the stellar record for this system to compare temperature, spectral type, and known planets.
Open Kepler-257More planets in this system