GJ 3378 b
A confirmed exoplanet orbiting GJ 3378.
Compared with Earth
- Mass
- About 2.3 times Earth's mass.
- Temperature
- About -1 °C (30 °F) from starlight alone, against -18 °C (-1 °F) for Earth measured the same way.
- Starlight
- About 91% of the starlight Earth gets from the Sun.
- Year
- A year here lasts about 21 Earth days.
Planet
- Radius
- Unknown
- Mass
- 2.3 × Earth
- Density
- Unknown
- Equilibrium temperature
- 272 K
- Starlight received
- 0.91 × Earth
- Orbital period
- 21.45 days
- Average distance from its star
- 0.09673 AU
Star
- Host star
- GJ 3378
- Spectral class
- M — red dwarf
- Surface temperature
- 3,340 K
- Radius
- 0.275 × Sun
- Mass
- 0.262 × Sun
- Age
- Unknown
System
- Distance from Earth
- 25.19 light-years (7.723 parsecs)
- Stars in system
- 1
- Known planets
- 1
Discovery
- Year
- 2026
- Method
- Radial Velocity
- Facility
- Mauna Kea Observatory
Data from the NASA Exoplanet Archive, synced October 14, 2026.