Gas giant · HD 102117

HD 102117 b

ExoplanetsDiscovered 2005

Scientific overview

HD 102117 b is a gas giant orbiting HD 102117, completing an orbit every 21 days, about 129 light-years from Earth. It was discovered in 2005 using the radial velocity method.

Host star

Uklun

Spectral type

G6 V

Temperature

5,655 K

Mass

1.06 M☉

Discovery and detection

Detection method

Radial Velocity Method

Discovery year

2005

Discovered at

La Silla Observatory

Knowledge connections

OrbitsUklun
Discovered by methodRadial Velocity Method
Discovered atLa Silla Observatory
Catalogued inNASA Exoplanet Archive

Quick facts

Class: Gas giant
Host star: Uklun
Discovery method: Radial Velocity Method
Discovery year: 2005
Orbital period: 20.8133 d
Semi-major axis: 0.15 AU
Eccentricity: 0.12
Radius: 8.47 R⊕
Mass: 54.03 M⊕
Density: 0.49 g/cm³ · derived
Equilibrium temp.: 781 K
Insolation: 63.85 S⊕
Distance: 129 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 density0.49 g/cm³derived
Formula & inputs
Formula: ρ = M / (4⁄3·π·r³) (v1.0.0, impl v1.0.0)
Inputs:
- massEarth = 54.03 M⊕ · NASA
- radiusEarth = 8.47 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.