Terrestrial planet · G 261-6

G 261-6 b

ExoplanetsDiscovered 2025

Scientific overview

G 261-6 b is a terrestrial planet orbiting G 261-6, completing an orbit every 5 days, about 35 light-years from Earth. It was discovered in 2025 using the radial velocity method.

Host star

G 261-6

Spectral type

M5.5 V

Temperature

2,907 K

Mass

0.118 M☉

Discovery and detection

Detection method

Radial Velocity Method

Discovery year

2025

Knowledge connections

OrbitsG 261-6
Discovered by methodRadial Velocity Method
Catalogued inNASA Exoplanet Archive

Quick facts

Class: Terrestrial planet
Host star: G 261-6
Discovery method: Radial Velocity Method
Discovery year: 2025
Orbital period: 5.4536 d
Semi-major axis: 0.0297 AU
Eccentricity: 0
Radius: 1.1 R⊕
Mass: 1.37 M⊕
Density: 5.67 g/cm³ · derived
Equilibrium temp.: 322 K
Insolation: 1.8 S⊕
Distance: 35 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 density5.67 g/cm³derived
Formula & inputs
Formula: ρ = M / (4⁄3·π·r³) (v1.0.0, impl v1.0.0)
Inputs:
- massEarth = 1.37 M⊕ · NASA
- radiusEarth = 1.1 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.