Gas giant · HD 143811 A

HD 143811 AB b

ExoplanetsDiscovered 2025

Scientific overview

HD 143811 AB b is a gas giant orbiting HD 143811 A, completing an orbit every 117000 days, about 446 light-years from Earth. It was discovered in 2025 using the direct imaging.

Host star

HD 143811 A

Temperature

6,791 K

Mass

1.32 M☉

Discovery and detection

Detection method

Direct Imaging

Discovery year

2025

Discovered at

Very Large Telescope (VLT)

Knowledge connections

OrbitsHD 143811 A
Discovered by methodDirect Imaging
Discovered atVery Large Telescope (VLT)
Catalogued inNASA Exoplanet Archive

Quick facts

Class: Gas giant
Host star: HD 143811 A
Discovery method: Direct Imaging
Discovery year: 2025
Orbital period: 117000 d
Semi-major axis: 63 AU
Eccentricity: 0.19
Radius: 15.69 R⊕
Mass: 1938.75 M⊕
Density: 2.77 g/cm³ · derived
Equilibrium temp.: 1042 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 density2.77 g/cm³derived
Formula & inputs
Formula: ρ = M / (4⁄3·π·r³) (v1.0.0, impl v1.0.0)
Inputs:
- massEarth = 1938.75 M⊕ · NASA
- radiusEarth = 15.69 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.