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Epic exoplanet 51 EP

TOI-1203 b

RA 168.2267° · Dec -34.4069° · exoplanet

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Score breakdown

· 6 badges
51 pts · Epic
Epic 78 pts → Anomaly
  • Lava world +14
  • Tidally locked +10
  • Super-Earth +8
  • Orbits a Sun-like star +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
Total score 51

27 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Super-Earth · +8
  • Lava world · +14
  • Tidally locked · +10
  • Multi-planet system · +6
  • Orbits a Sun-like star · +8

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. 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. 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 8.6 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 March — that's when to go looking.

Properties

density gcc
5.48
diameter km
19389.424
discovery facility
La Silla Observatory
discovery method
Radial Velocity
discovery year
2025
dist ly
211.9828
eccentricity
0.067
eq temp k
1361.2
host star teff
5737
inclination
84.29
insolation
572.2
mag
8.59
mass earth
3.51
name
TOI-1203 b
orbital period days
4.1573
radius earth
1.52
semi major au
0.0487
spect
G3 V
sys num planets
4
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About TOI-1203 b

TOI-1203 b is an epic exoplanet. It lies about 212 light-years from Earth, shines at apparent magnitude 8.59, has spectral type G3 V and has an equilibrium temperature near 1,361 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 8.59, it is an easy target for binoculars.

Like any astronomical target, TOI-1203 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-1203 b is an epic exoplanet

TOI-1203 b scores 51 points on Spacedle's rarity scale, which places it in the epic tier. Another 27 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 Orbits a Sun-like star — 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.