HD 128717 b
Orbiting HD 128717
HD 128717 b is an exoplanet orbiting the star HD 128717, discovered in 2025 using the Astrometry method.
Mass
6293.00
Earth masses
Orbital Period
3420.0
days
Distance
73.6
parsecs
Radius (Earth radii)
Unknown
Mass (Earth masses)
6293.00
Measured
Equilibrium Temperature
Unknown
Parameter source: Pinamonti et al. 2026
Orbital Period
3420.000+20.000−20.000days
Semi-Major Axis
4.8500+0.0200−0.0100au
Planet Mass (Earth masses)
6293.00+158.91−158.91
Planet Mass (Jupiter masses)
19.8000+0.5000−0.5000
Eccentricity
0.8500+0.0020−0.0020
Epoch of Periastron
2460189.63+0.30−0.30days(JD)
Argument of Periastron
-105.7+0.4−0.3deg
Distance from Earth
73.6 pc (~240 ly)
Spectral Type
Unknown
Temperature
6210 K
Mass (Solar)
1.21 M☉
Radius (Solar)
1.25 R☉
Luminosity
0.32 log L☉
Planets in System
1
Stars in System
1
Coordinates (RA, Dec)
219.0882°, 57.5610°
Discovery Method
Astrometry
Discovery Year
2025
Source ID: HD 128717 b
HD 128717 b orbits HD 128717 and was reported in 2025 and was detected with the Astrometry method.
Published measurements list a mass of 6,293 Earth masses and an orbital period of 3,420 days.
Catalog data places the system at about 73.6 parsecs from Earth and 1 known planet in the system.
Host star
Explore the stellar record for this system to compare temperature, spectral type, and known planets.
Open HD 128717