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HD 128717 b | Exoplanets | Apex Andromeda | Apex Andromeda

Planets/Exoplanets/HD 128717 b

Confirmed exoplanet · Gas Giant

HD 128717 b

Orbiting HD 128717

Discovered in 2025 using Astrometry. 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 HD 128717 b — Generic category artwork—not a direct imageApex Andromeda catalog artwork

Discovery: 2,025
Method: Astrometry
Radius: 12.1 R⊕
Mass: 6,293.002459 M⊕
Orbit: 3,420 days
Distance: 73.636 pc

Planet profile

Orbit and physical properties

Orbital period: 3,420 days
Semi-major axis: 4.85 AU
Eccentricity: 0.85
Radius: 12.1 Earth radii
Mass: 6,293.002459 Earth masses
Mass provenance: Mass
Density: 19.5 g/cm³
Equilibrium temperature: 151.9 K
Insolation: 0.0892 Earth flux

Host system

Star and system properties

Host star: HD 128717
Stars in system: 1
Known planets in system: 1
Spectral type: Not reported by the NASA Exoplanet Archive
Stellar temperature: 6,210 K
Stellar radius: 1.248 R☉
Stellar mass: 1.212 M☉
Stellar metallicity: 0.16 dex
Stellar age: 1.4 Gyr
Distance: 73.636 parsecs
Right ascension: 14h36m21.16s
Declination: +57d33m39.42s

Discovery

Detection and provenance

Discovery method: Astrometry
Discovery year: 2,025
Publication date: 2026-03
Discovery locale: Space
Facility: European Space Agency (ESA) Gaia Satellite
Telescope: 1.45 m x 0.5 m Telescope
Instrument: Gaia CCD array
NASA Exoplanet Archive: Open composite record ↗

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