← Back to dex
Rare exoplanet 47 EP

TOI-238 b

RA 349.2311° · Dec -18.6066° · exoplanet

Loading sky survey…
🌌 View in 3D star map
Tonight’s visibility

Computing the sky for your location…

Score breakdown

· 6 badges
47 pts · Rare
Rare 50 pts → Epic
  • Lava world +14
  • Tidally locked +10
  • Super-Earth +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Found by TESS +4
Total score 47

3 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • Super-Earth · +8
  • Lava world · +14
  • Tidally locked · +10
  • Multi-planet system · +6
  • 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.

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 10.7 you'll want a small backyard telescope.
  • 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 September — that's when to go looking.

Properties

density gcc
6.8
diameter km
19886.9158
discovery facility
Transiting Exoplanet Survey Satellite (TESS)
discovery method
Transit
discovery year
2024
dist ly
262.6883
eccentricity
0.18
eq temp k
1378
host star teff
5059
inclination
85.78
insolation
753.1
mag
10.748
mass earth
3.37
name
TOI-238 b
orbital period days
1.2731
radius earth
1.559
semi major au
0.0212
spect
K2 V
sys num planets
2
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About TOI-238 b

TOI-238 b is a rare exoplanet. It lies about 262.7 light-years from Earth, shines at apparent magnitude 10.75, has spectral type K2 V and has an equilibrium temperature near 1,378 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 10.75, a small backyard telescope will bring it into view.

Like any astronomical target, TOI-238 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-238 b is a rare exoplanet

TOI-238 b scores 47 points on Spacedle's rarity scale, which places it in the rare tier. Another 3 points would lift it into a rarer tier.

That score comes from 6 science badges — Confirmed exoplanet, Super-Earth, Lava world, Tidally locked, Multi-planet system 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.