Gas giant · HD 210277

HD 210277 b

ExoplanetsDiscovered 1998

Scientific overview

HD 210277 b is a gas giant orbiting HD 210277, completing an orbit every 442 days, about 69 light-years from Earth. It was discovered in 1998 using the radial velocity method.

Host star

HD 210277

Spectral type

G0 V

Temperature

5,538 K

Mass

1.01 M☉

Discovery and detection

Detection method

Radial Velocity Method

Discovery year

1998

Discovered at

W. M. Keck Observatory

Knowledge connections

OrbitsHD 210277
Discovered by methodRadial Velocity Method
Discovered atW. M. Keck Observatory
Catalogued inNASA Exoplanet Archive

Quick facts

Class: Gas giant
Host star: HD 210277
Discovery method: Radial Velocity Method
Discovery year: 1998
Orbital period: 442.19 d
Semi-major axis: 1.13 AU
Eccentricity: 0.48
Radius: 13.6 R⊕
Mass: 410 M⊕
Density: 0.90 g/cm³ · derived
Equilibrium temp.: 260 K
Insolation: 0.73 S⊕
Distance: 69 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 density0.90 g/cm³derived
Formula & inputs
Formula: ρ = M / (4⁄3·π·r³) (v1.0.0, impl v1.0.0)
Inputs:
- massEarth = 410 M⊕ · NASA
- radiusEarth = 13.6 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.