:INFO
Mini-neptune around AU Mic
It is 2.79 times Earth's radius, closest in size to Neptune, and 14.5 times Earth's mass, at 3.90 g/cm3, less dense than Earth. A year there lasts 18.86 days, on an orbit 3 times closer to its star than Mercury is to the Sun. Its equilibrium temperature is 425 K, hotter than any desert. The host star AU Mic runs at 3540 K with 0.64 times the Sun's mass.

:STATS
[icon:TARGET] Radius | 2.79 Earth radii
[icon:CHART] Mass | 14.5 Earth masses
[icon:FIRE] Equilibrium temperature | 425 K (measured)
[icon:CLOCK] One year | 18.86 days
[icon:BOLT] Orbit radius | 0.1190 AU
[icon:STAR] Host star | AU Mic at 3540 K
[icon:USERS] Distance | 32 light-years
[icon:TRENDING_DOWN] Starlight blocked | 0.088% at each transit

:TIMELINE
🔭🪐📅
2020-01-01 | AU Mic b
2021-01-01 | AU Mic c

:PATH
What the transit gives
How deep the star dims fixes the planet's size relative to it.

:NOTE
Found by Transiting Exoplanet Survey Satellite (TESS) in 2021. TESS scans most of the sky in 27-day stretches, so it favours bright nearby stars and short orbits over the faint distant ones Kepler specialised in.

:NOTE
The size came from a crossing, the mass did not. That pairing is uncommon and it is what lets anyone say whether this is rock or gas.

:NOTE
AU Mic has 4 known planets. Multi-planet systems are where orbital dynamics can be measured rather than assumed.

:LINK
https://exoplanetarchive.ipac.caltech.edu/overview/AU%20Mic%20c
NASA Exoplanet Archive: every published measurement of this planet