AU Mic b
A confirmed exoplanet orbiting AU Mic.
Compared with Earth
- Size
- About 4.8 times Earth's width.
- Mass
- About 9 times Earth's mass.
- Temperature
- About 282 °C (539 °F) from starlight alone, against -18 °C (-1 °F) for Earth measured the same way.
- Year
- A year here lasts about 8.5 Earth days.
Planet
- Radius
- 4.79 × Earth
- Mass
- 8.99 × Earth
- Density
- 0.49 g/cm³
- Equilibrium temperature
- 554.8 K
- Starlight received
- Unknown
- Orbital period
- 8.463 days
- Average distance from its star
- 0.07 AU
Star
- Host star
- AU Mic
- Spectral class
- M — red dwarf
- Surface temperature
- 3,540 K
- Radius
- 0.862 × Sun
- Mass
- 0.635 × Sun
- Age
- 0.019 billion years
System
- Distance from Earth
- 31.71 light-years (9.722 parsecs)
- Stars in system
- 1
- Known planets
- 4
Discovery
- Year
- 2020
- Method
- Transit
- Facility
- Transiting Exoplanet Survey Satellite (TESS)
Data from the NASA Exoplanet Archive, synced October 14, 2026.