Gas giant · ROXs 12

ROXs 12 b

ExoplanetsDiscovered 2013

Scientific overview

ROXs 12 b is a gas giant orbiting ROXs 12, about 446 light-years from Earth. It was discovered in 2013 using the direct imaging.

Host star

Spectral type

M0

Temperature

3,850 K

Mass

0.87 M☉

Discovery and detection

Detection method

Discovery year

2013

W. M. Keck Observatory

Knowledge connections

OrbitsROXs 12
Discovered by methodDirect Imaging
Discovered atW. M. Keck Observatory
Catalogued inNASA Exoplanet Archive

Quick facts

Class: Gas giant
Host star: ROXs 12
Discovery method: Direct Imaging
Discovery year: 2013
Semi-major axis: 210 AU
Eccentricity: 0.83
Radius: 12.2 R⊕
Mass: 5085 M⊕
Density: 15.44 g/cm³ · derived
Equilibrium temp.: 13 K
Distance: 446 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 density15.44 g/cm³derived
Formula & inputs
Formula: ρ = M / (4⁄3·π·r³) (v1.0.0, impl v1.0.0)
Inputs:
- massEarth = 5085 M⊕ · NASA
- radiusEarth = 12.2 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.