Confirmed exoplanet · Database record + computed analysis
AU Mic d
A confirmed world orbiting AU Mic, 31.7 light-years away.
An Earth-sized world
1.02 times Earth's radius, squarely in the terrestrial size range. With 1.1 Earth masses packed into that size, its density points to rock and iron rather than gas.
The orbit
Its year, one full orbit, takes just 12.7 Earth days. Orbiting this tightly around a cool star, it is very likely tidally locked: one hemisphere in permanent day, the other in permanent night.
Its sun
Its star is a red dwarf (3,678 K surface), type M1 V: small, dim, flare-prone, and destined to outlive the Sun many times over. It shares the system with 3 other known planets.
How far is that, really?
At 32 light-years, tonight's light from this system left it around the year 1994. That is close by galactic standards, which makes it a prime target for follow-up telescopes. A Voyager-speed probe would need roughly 561,019 years to get there.
How we found it
It was found through transit timing variations: its gravity nudges a sibling planet's transits early and late, betraying its presence without ever being seen directly. The discovery was announced in 2023 from Multiple Observatories.
Everything above is computed from the archive’s measured values for this planet. Where a quantity is missing, the statement is omitted rather than guessed.
About this record
The measured values come from the NASA Exoplanet Archive, and any missing value has not been determined yet; the Atlas never fills gaps with guesses. More standout worlds: Proxima b, TRAPPIST-1e, K2-18 b, 55 Cancri e, and the detection methods that found them all.