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Uncommon exoplanet 27 EP

AU Mic d

RA 311.2911° · Dec -31.3424° · exoplanet

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Score breakdown

· 3 badges
27 pts · Uncommon
Uncommon 34 pts → Rare
  • Earth-sized +16
  • Multi-planet system +6
  • Confirmed exoplanet +5
Total score 27

7 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Earth-sized · +16
  • Multi-planet system · +6

Trivia

What makes it special

  • Earth-sized. Genuinely comparable to Earth in size. Worlds in this narrow band are the ones every next-generation telescope is being pointed at.

What it actually is

  • Hugging its star. It orbits closer to its star than Mercury does to the Sun, completing a lap in less time than Mercury takes.
  • What it is made of. Its density says rock, though lighter than Earth's mix: probably less iron, or a thick shell of water and ice over the top.
  • Crowded system. One of at least 4 planets orbiting its star.

Sense of scale

  • In perspective. Inside our stellar backyard: every radio broadcast humanity has ever made has already swept past it.

Find it in the sky

  • How to spot it. At magnitude 8.8 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • Southern sky. It rides the southern half of the sky — an easier target the further south you are.
  • Best time of year. It stands highest in the middle of the night around August — that's when to go looking.

Properties

density gcc
5.45
diameter km
13011.324
discovery facility
Multiple Observatories
discovery method
Transit Timing Variations
discovery year
2023
dist ly
31.7092
eccentricity
0.0031
host star teff
3678
inclination
89.3181
mag
8.81
mass earth
1.053
name
AU Mic d
orbital period days
12.736
radius earth
1.02
spect
M1 V
sys num planets
4
sys num stars
1

Nearby objects

About AU Mic d

AU Mic d is an uncommon exoplanet. It lies about 31.7 light-years from Earth, shines at apparent magnitude 8.81, has spectral type M1 V and spans roughly 1.02 Earth radii.

Genuinely comparable to Earth in size. Worlds in this narrow band are the ones every next-generation telescope is being pointed at.

How to see it

At apparent magnitude 8.81, it is an easy target for binoculars.

Like any astronomical target, AU Mic d is best seen from a dark site away from city lights, and when it is above the horizon depends on your latitude and the time of year. The visibility panel above works out tonight's viewing window for your saved location.

Why AU Mic d is an uncommon exoplanet

AU Mic d scores 27 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 7 points would lift it into a rarer tier.

That score comes from 3 science badges — Confirmed exoplanet, Earth-sized and Multi-planet system — each earned for a real, measurable property of the object. Rarity on Spacedle is never random: the more remarkable an object's astrophysics, the more badges it collects, the higher it scores, and the rarer it ranks.