GJ 3998 b
Orbiting GJ 3998
GJ 3998 b is an exoplanet orbiting the star GJ 3998, discovered in 2016 using the Radial Velocity method.
Minimum Mass (M sin i)
2.50
Earth masses
Orbital Period
2.7
days
Distance
18.1
parsecs
Radius (Earth radii)
Unknown
Minimum Mass, M sin(i) (Earth masses)
2.50
Radial-velocity minimum
Equilibrium Temperature
Unknown
Parameter source: Stefanov et al. 2025
Orbital Period
2.650+0.000−0.000days
Semi-Major Axis
0.0300+0.0010−0.0010au
M sin(i) (Earth masses)
2.50+0.30−0.29
M sin(i) (Jupiter masses)
0.0079+0.0009−0.0009
Eccentricity
0.0000
Radial Velocity Semi-Amplitude
1.79+0.18−0.18m/s
Distance from Earth
18.1 pc (~59 ly)
Spectral Type
Unknown
Temperature
3726 K
Mass (Solar)
0.52 M☉
Radius (Solar)
0.50 R☉
Luminosity
-1.36 log L☉
Planets in System
3
Stars in System
1
Coordinates (RA, Dec)
259.0021°, 11.0562°
Discovery Method
Radial Velocity
Discovery Year
2016
Source ID: GJ 3998 b
GJ 3998 b orbits GJ 3998 and was reported in 2016 and was detected with the Radial Velocity method.
Published measurements list a minimum mass of 2.5 Earth masses (M sin i) and an orbital period of 2.65 days.
Catalog data places the system at about 18.1 parsecs from Earth and 3 known planets in the system.
Host star
Explore the stellar record for this system to compare temperature, spectral type, and known planets.
Open GJ 3998