Exoplanet

GJ 1214 b

Orbiting GJ 1214

Overview

GJ 1214 b is an exoplanet orbiting the star GJ 1214, discovered in 2009 using the Transit method. It is a Mini-Neptune world.

Key Measurements

Radius

2.73

Earth radii

015 R⊕

Mass

8.41

Earth masses

0500 M⊕

Orbital Period

1.6

days

0.1d10,000d

Distance

14.6

parsecs

Nearby10,000 pc

Equilibrium Temp

567

K

150 K3,500 K

Radius (Earth radii)

2.73

Mass (Earth masses)

8.41

Measured

Equilibrium Temperature

567 K

Parameter source: Mahajan et al. 2024

Orbital Period

1.580+0.000−0.000days

Semi-Major Axis

0.0150+0.0001−0.0001au

Planet Mass (Earth masses)

8.41+0.36−0.35

Planet Mass (Jupiter masses)

0.0265+0.0011−0.0011

Eccentricity

0.0062+0.0079−0.0044

Epoch of Periastron

2459639.73+0.03−0.27days(BJD-TDB)

Argument of Periastron

77.0+7.5−61.0deg

Radial Velocity Semi-Amplitude

14.38+0.57−0.56m/s

Distance from Earth

14.6 pc (~48 ly)

Spectral Type

Unknown

Temperature

3101 K

Mass (Solar)

0.18 M☉

Radius (Solar)

0.22 R☉

Luminosity

-2.41 log L☉

Planets in System

1

Stars in System

1

Coordinates (RA, Dec)

258.8314°, 4.9607°

Discovery Method

Transit

Discovery Year

2009

Data Sources
NASA Exoplanet Archive

Source ID: GJ 1214 b

System Context

GJ 1214 b orbits GJ 1214 and was reported in 2009 and was detected with the Transit method.

Published measurements list a radius of 2.73 Earth radii, a mass of 8.41 Earth masses, an orbital period of 1.58 days, and an equilibrium temperature near 567 K.

Catalog data places the system at about 14.6 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 GJ 1214