Exoplanet

K2-21 c

Orbiting K2-21

Overview

K2-21 c is an exoplanet orbiting the star K2-21, discovered in 2015 using the Transit method. It is a Super-Earth world.

Key Measurements

Radius

2.49

Earth radii

015 R⊕

Mass (est.)

7.19

Earth masses

0500 M⊕

Orbital Period

15.5

days

0.1d10,000d

Distance

83.6

parsecs

Nearby10,000 pc

Radius (Earth radii)

2.49

Mass (Earth masses)

7.19

Estimated

Equilibrium Temperature

Unknown

Parameter source: Dressing et al. 2017

Orbital Period

15.502+0.001−0.001days

Semi-Major Axis

0.1070+0.0030−0.0040au

Eccentricity

0.2100+0.2068−0.1737

Argument of Periastron

60.0+75.7−120.6deg

Distance from Earth

83.6 pc (~273 ly)

Spectral Type

Unknown

Temperature

4222 K

Mass (Solar)

0.68 M☉

Radius (Solar)

0.65 R☉

Luminosity

Unknown

Planets in System

2

Stars in System

1

Coordinates (RA, Dec)

340.3038°, -14.4893°

Discovery Method

Transit

Discovery Year

2015

Data Sources
NASA Exoplanet Archive

Source ID: K2-21 c

System Context

K2-21 c orbits K2-21 and was reported in 2015 and was detected with the Transit method.

Published measurements list a radius of 2.49 Earth radii, a mass of 7.19 Earth masses (estimated), and an orbital period of 15.5 days.

Catalog data places the system at about 83.6 parsecs from Earth and 2 known planets in the system.

Host star

Explore the stellar record for this system to compare temperature, spectral type, and known planets.

Open K2-21

More planets in this system

K2-21 b