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HIP 81991 b | Exoplanets | Apex Andromeda | Apex Andromeda

Planets/Exoplanets/HIP 81991 b

Confirmed exoplanet · Gas Giant

HIP 81991 b

Orbiting HIP 81991

Discovered in 2026 using Radial Velocity. This page reflects the latest synchronized NASA Exoplanet Archive composite record.

NASA Archive record ↗Back to catalog →

Generic gas giant catalog artwork; not a direct image of HIP 81991 b — Generic category artwork—not a direct imageApex Andromeda catalog artwork

Discovery: 2,026
Method: Radial Velocity
Radius: 12.5 R⊕
Mass: 3,019.369867 M⊕
Orbit: 5,860 days
Distance: 43.9016 pc

Planet profile

Orbit and physical properties

Orbital period: 5,860 days
Semi-major axis: 6.4 AU
Eccentricity: Not reported by the NASA Exoplanet Archive
Radius: 12.5 Earth radii
Mass: 3,019.369867 Earth masses
Mass provenance: Mass
Density: 8.49 g/cm³
Equilibrium temperature: 163.28 K
Insolation: 0.1185 Earth flux

Host system

Star and system properties

Host star: HIP 81991
Stars in system: 2
Known planets in system: 1
Spectral type: G8 V
Stellar temperature: 5,100 K
Stellar radius: 2.82111 R☉
Stellar mass: 1.09 M☉
Stellar metallicity: -0.27 dex
Stellar age: Not reported by the NASA Exoplanet Archive
Distance: 43.9016 parsecs
Right ascension: 16h44m59.76s
Declination: +06d05m13.37s

Discovery

Detection and provenance

Discovery method: Radial Velocity
Discovery year: 2,026
Publication date: 2026-08
Discovery locale: Ground
Facility: Multiple Facilities
Telescope: Multiple Telescopes
Instrument: Multiple Instruments
NASA Exoplanet Archive: Open composite record ↗

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