HD 100508 b
Orbiting HD 100508
HD 100508 b is an exoplanet orbiting the star HD 100508, discovered in 2026 using the Radial Velocity method.
Mass
381.39
Earth masses
Orbital Period
5681.0
days
Distance
32.8
parsecs
What these measurements mean
These comparisons use the reported catalog values. They are interpretations and calculations, not additional observations.
- A year on this world
- One orbit lasts about 15.6 Earth years. This comparison uses the reported orbital period. It does not measure the planet's rotation or the length of its day.
- What the mass can tell you
- Mass describes how much material the planet contains. Inspect the published uncertainty and reference before combining it with a radius to estimate density. Catalog values can come from different studies.
Radius (Earth radii)
Unknown
Mass (Earth masses)
381.39
Measured
Equilibrium Temperature
Unknown
Parameter source: Wu et al. 2026
Orbital Period
5681.000+42.000−42.000days
Semi-Major Axis
6.1100+0.2500−0.2800au
Planet Mass (Earth masses)
381.39+95.35−57.21
Planet Mass (Jupiter masses)
1.2000+0.3000−0.1800
Eccentricity
0.4200+0.0200−0.0200
Epoch of Periastron
2447556.00+87.00−84.00days(BJD)
Argument of Periastron
99.1+4.1−4.2deg
Distance from Earth
32.8 pc (~107 ly)
Spectral Type
K1 IV
Temperature
5419 K
Mass (Solar)
0.94 M☉
Radius (Solar)
Unknown
Luminosity
Unknown
Planets in System
1
Stars in System
1
Coordinates (RA, Dec)
173.3014°, -67.0546°
Discovery Method
Radial Velocity
Discovery Year
2026
Source ID: HD 100508 b
HD 100508 b orbits HD 100508 and was reported in 2026 and was detected with the Radial Velocity method.
Published measurements list a mass of 381.39 Earth masses and an orbital period of 5,681 days.
Catalog data places the system at about 32.8 parsecs from Earth, a host star classified as K1 IV, 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 100508