Ross 128 b
A confirmed exoplanet orbiting Ross 128.
Compared with Earth
- Mass
- About 1.4 times Earth's mass.
- Temperature
- About 28 °C (82 °F) from starlight alone, against -18 °C (-1 °F) for Earth measured the same way.
- Starlight
- About 1.4 times the starlight Earth gets from the Sun.
- Year
- A year here lasts about 9.9 Earth days.
Planet
- Radius
- Unknown
- Mass
- 1.4 × Earth
- Density
- Unknown
- Equilibrium temperature
- 301 K
- Starlight received
- 1.38 × Earth
- Orbital period
- 9.866 days
- Average distance from its star
- 0.0496 AU
Star
- Host star
- Ross 128
- Spectral class
- M — red dwarf
- Surface temperature
- 3,192 K
- Radius
- 0.1967 × Sun
- Mass
- 0.168 × Sun
- Age
- 5 billion years
System
- Distance from Earth
- 11.01 light-years (3.375 parsecs)
- Stars in system
- 1
- Known planets
- 1
Discovery
- Year
- 2017
- Method
- Radial Velocity
- Facility
- La Silla Observatory
Data from the NASA Exoplanet Archive, synced October 14, 2026.