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Epic exoplanet 73 EP

TOI-4311 b

RA 41.6855° · Dec -31.1793° · exoplanet

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Score breakdown

· 8 badges
73 pts · Epic
Epic 78 pts → Anomaly
  • Denser than iron +18
  • Lava world +14
  • Ultra-short period +14
  • Super-Earth +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Blasted by starlight +4
  • Found by TESS +4
Total score 73

5 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Super-Earth · +8
  • Lava world · +14
  • Ultra-short period · +14
  • Denser than iron · +18
  • Multi-planet system · +6
  • Blasted by starlight · +4
  • Found by TESS · +4

Trivia

What makes it special

  • Lava world. Its surface is almost certainly an ocean of molten rock, kept liquid by the star it hugs.

Hard to believe

  • Denser than iron. It is packed tighter than solid iron — whatever it is made of, it is not ordinary rock.
  • A year in a day. Its entire year is over in 23.8 hours. Birthdays here would come round faster than meals.

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. Denser than Earth — a solid world of rock and iron, with no meaningful atmosphere to speak of by mass.
  • Crowded system. One of at least 2 planets orbiting its star.

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 11.4 you'll want a small backyard telescope.

Properties

density gcc
9.3
diameter km
17552.5312
discovery facility
Transiting Exoplanet Survey Satellite (TESS)
discovery method
Transit
discovery year
2026
dist ly
440.2715
eq temp k
1664
host star teff
5063
inclination
85.4
insolation
1273
mag
11.388
mass earth
4.5
name
TOI-4311 b
orbital period days
0.9903
radius earth
1.376
semi major au
0.0182
spect
K
sys num planets
2
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About TOI-4311 b

TOI-4311 b is an epic exoplanet. It lies about 440.3 light-years from Earth, shines at apparent magnitude 11.39, has spectral type K and has an equilibrium temperature near 1,664 K.

Its surface is almost certainly an ocean of molten rock, kept liquid by the star it hugs.

How to see it

At apparent magnitude 11.39, a small backyard telescope will bring it into view.

Like any astronomical target, TOI-4311 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-4311 b is an epic exoplanet

TOI-4311 b scores 73 points on Spacedle's rarity scale, which places it in the epic tier. Another 5 points would lift it into a rarer tier.

That score comes from 8 science badges — Confirmed exoplanet, Super-Earth, Lava world, Ultra-short period, Denser than iron, Multi-planet system, Blasted by starlight and Found by TESS — 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.