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Epic exoplanet 52 EP

TOI-7166 b

RA 320.6806° · Dec 8.8894° · exoplanet

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Score breakdown

· 5 badges
52 pts · Epic
Epic 78 pts → Anomaly
  • In the habitable zone +30
  • Orbits a red dwarf +8
  • Confirmed exoplanet +5
  • Sub-Neptune +5
  • Found by TESS +4
Total score 52

26 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • In the habitable zone · +30
  • Sub-Neptune · +5
  • Found by TESS · +4
  • Orbits a red dwarf · +8

Trivia

What makes it special

  • Goldilocks zone. Sits where it's neither too hot nor too cold — liquid water could exist on a surface here.

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.
  • What the zone means. The habitable zone is only about temperature: it is the band where liquid water could survive on a surface. It is a promising address, not evidence of anything living.

Sense of scale

  • In perspective. Far away by human standards, yet still a local address inside the Milky Way's spiral arms.

Find it in the sky

  • How to spot it. At magnitude 15.8 it is far too faint for the eye: this one belongs to cameras and long exposures.
  • Seen from everywhere. It sits almost on the celestial equator, so it can be seen from essentially anywhere on Earth.
  • Best time of year. It stands highest in the middle of the night around August — that's when to go looking.

Properties

density gcc
3.18
diameter km
25639.962
discovery facility
Transiting Exoplanet Survey Satellite (TESS)
discovery method
Transit
discovery year
2025
dist ly
115.5091
eccentricity
0
eq temp k
249
habitable zone
yes
host star teff
3099
inclination
89.8
insolation
1.07
mag
15.79
mass earth
4.7
name
TOI-7166 b
orbital period days
12.9206
radius earth
2.01
semi major au
0.0619
spect
M4.5+/-0.5
sys num planets
1
sys num stars
1

About TOI-7166 b

TOI-7166 b is an epic exoplanet. It lies about 115.5 light-years from Earth, shines at apparent magnitude 15.79, has spectral type M4.5+/-0.5 and has an equilibrium temperature near 249 K.

Sits where it's neither too hot nor too cold — liquid water could exist on a surface here.

How to see it

At apparent magnitude 15.79, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, TOI-7166 b 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 TOI-7166 b is an epic exoplanet

TOI-7166 b scores 52 points on Spacedle's rarity scale, which places it in the epic tier. Another 26 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, In the habitable zone, Sub-Neptune, Found by TESS and Orbits a red dwarf — 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.