Mini-Neptune · GJ 422

GJ 422 b

ExoplanetsDiscovered 2014

Scientific overview

GJ 422 b is a mini-neptune orbiting GJ 422, completing an orbit every 20 days, about 41 light-years from Earth. It was discovered in 2014 using the radial velocity method.

Host star

GJ 422

Spectral type

M3.5 V

Temperature

3,323 K

Mass

0.35 M☉

Discovery and detection

Detection method

Radial Velocity Method

Discovery year

2014

Knowledge connections

OrbitsGJ 422
Discovered by methodRadial Velocity Method
Catalogued inNASA Exoplanet Archive

Quick facts

Class: Mini-Neptune
Host star: GJ 422
Discovery method: Radial Velocity Method
Discovery year: 2014
Orbital period: 20.129 d
Semi-major axis: 0.111 AU
Eccentricity: 0.11
Radius: 3.33 R⊕
Mass: 11.07 M⊕
Density: 1.65 g/cm³ · derived
Equilibrium temp.: 293 K
Insolation: 0.89 S⊕
Distance: 41 ly

Density is derived from the archive mass and radius via ρ = M / (4⁄3·π·r³); all other values are catalogued measurements.

Derived values

Computed from source-backed inputs via standard formulae — not observations. Every input and constant is traced below.

Bulk density1.65 g/cm³derived
Formula & inputs
Formula: ρ = M / (4⁄3·π·r³) (v1.0.0, impl v1.0.0)
Inputs:
- massEarth = 11.07 M⊕ · NASA
- radiusEarth = 3.33 R⊕ · NASA
Assumptions: M⊕ = 5.972e+24 kg, R⊕ = 6371000 m (IAU 2015 B3 nominal); Assumes a uniform sphere.
Limitations: Withheld above 30 g/cm³ (inconsistent mass/radius inputs).; Archive mass/radius carry no propagated uncertainty here.
Uncertainty: not propagated (inputs carry no catalogued uncertainty)
Computed as of 2026-06-29.

Quality & authority

Partial

Unreviewed

Description: Complete
Source coverage: Partial
Relationship coverage: Complete
Review coverage: None
Citation coverage: None
Image coverage: Not applicable

Data from the NASA Exoplanet Archive. See source quality.