Gas giant · HD 208487

HD 208487 b

ExoplanetsDiscovered 2004

Scientific overview

HD 208487 b is a gas giant orbiting HD 208487, completing an orbit every 129 days, about 147 light-years from Earth. It was discovered in 2004 using the radial velocity method.

Host star

Itonda

Spectral type

G2 V

Temperature

6,134 K

Mass

1.15 M☉

Discovery and detection

Detection method

Radial Velocity Method

Discovery year

2004

Knowledge connections

OrbitsItonda
Discovered by methodRadial Velocity Method
Catalogued inNASA Exoplanet Archive

Quick facts

Class: Gas giant
Host star: Itonda
Discovery method: Radial Velocity Method
Discovery year: 2004
Orbital period: 129.36 d
Semi-major axis: 0.53 AU
Eccentricity: 0.37
Radius: 14.3 R⊕
Mass: 146.2 M⊕
Density: 0.28 g/cm³ · derived
Equilibrium temp.: 438 K
Insolation: 6.09 S⊕
Distance: 147 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 density0.28 g/cm³derived
Formula & inputs
Formula: ρ = M / (4⁄3·π·r³) (v1.0.0, impl v1.0.0)
Inputs:
- massEarth = 146.2 M⊕ · NASA
- radiusEarth = 14.3 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.