GJ 3998 b
A confirmed exoplanet orbiting GJ 3998.
Compared with Earth
- Mass
- About 2.5 times Earth's mass.
- Starlight
- About 48 times the starlight Earth gets from the Sun.
- Year
- A year here lasts about 2.7 Earth days.
Planet
- Radius
- Unknown
- Mass
- 2.5 × Earth
- Density
- Unknown
- Equilibrium temperature
- Unknown
- Starlight received
- 48 × Earth
- Orbital period
- 2.65 days
- Average distance from its star
- 0.03 AU
Star
- Host star
- GJ 3998
- Spectral class
- M — red dwarf
- Surface temperature
- 3,726 K
- Radius
- 0.5 × Sun
- Mass
- 0.52 × Sun
- Age
- 8.38 billion years
System
- Distance from Earth
- 59.18 light-years (18.15 parsecs)
- Stars in system
- 1
- Known planets
- 3
Discovery
- Year
- 2016
- Method
- Radial Velocity
- Facility
- Roque de los Muchachos Observatory
Data from the NASA Exoplanet Archive, synced October 14, 2026.