Exoplanet

Kepler-421 b

Orbiting Kepler-421

Overview

Kepler-421 b is an exoplanet orbiting the star Kepler-421, discovered in 2014 using the Transit method. It is a Neptune-sized world.

Key Measurements

Radius

4.16

Earth radii

015 R⊕

Mass (est.)

17.19

Earth masses

0500 M⊕

Orbital Period

704.2

days

0.1d10,000d

Distance

348.6

parsecs

Nearby10,000 pc

Equilibrium Temp

185

K

150 K3,500 K

Radius (Earth radii)

4.16

Mass (Earth masses)

17.19

Estimated

Equilibrium Temperature

185 K

Parameter source: Kipping et al. 2014

Orbital Period

704.198+0.002−0.002days

Semi-Major Axis

1.2190+0.0890−0.0890au

Eccentricity

0.0410+0.0950−0.0340

Argument of Periastron

160.0+150.0−120.0deg

Distance from Earth

348.6 pc (~1137 ly)

Spectral Type

G9/K0

Temperature

5308 K

Mass (Solar)

0.79 M☉

Radius (Solar)

0.76 R☉

Luminosity

-0.40 log L☉

Planets in System

1

Stars in System

1

Coordinates (RA, Dec)

283.2568°, 45.0877°

Discovery Method

Transit

Discovery Year

2014

Data Sources
NASA Exoplanet Archive

Source ID: Kepler-421 b

System Context

Kepler-421 b orbits Kepler-421 and was reported in 2014 and was detected with the Transit method.

Published measurements list a radius of 4.16 Earth radii, a mass of 17.19 Earth masses (estimated), an orbital period of 704.2 days, and an equilibrium temperature near 185 K.

Catalog data places the system at about 348.6 parsecs from Earth, a host star classified as G9/K0, 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 Kepler-421