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Epic exoplanet 51 EP

TOI-201 d

RA 87.4018° · Dec -54.9104° · exoplanet

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Score breakdown

· 6 badges
51 pts · Epic
Epic 78 pts → Anomaly
  • Denser than iron +18
  • Tidally locked +10
  • Super-Earth +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Found by TESS +4
Total score 51

27 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Super-Earth · +8
  • Tidally locked · +10
  • Denser than iron · +18
  • Multi-planet system · +6
  • Found by TESS · +4

Trivia

Hard to believe

  • Denser than iron. It is packed tighter than solid iron — whatever it is made of, it is not ordinary rock.

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 3 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 9.1 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 December — that's when to go looking.

Properties

density gcc
11
diameter km
17731.118
discovery facility
Transiting Exoplanet Survey Satellite (TESS)
discovery method
Transit
discovery year
2026
dist ly
371.2471
eccentricity
0.3
eq temp k
1237
host star teff
6423
inclination
91.7
insolation
389.669
mag
9.07
mass earth
5.8
name
TOI-201 d
orbital period days
5.8489
radius earth
1.39
semi major au
0.0698
spect
F
sys num planets
3
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About TOI-201 d

TOI-201 d is an epic exoplanet. It lies about 371.2 light-years from Earth, shines at apparent magnitude 9.07, has spectral type F and has an equilibrium temperature near 1,237 K.

It orbits closer to its star than Mercury does to the Sun, completing a lap in less time than Mercury takes.

How to see it

At apparent magnitude 9.07, a small backyard telescope will bring it into view.

Like any astronomical target, TOI-201 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 TOI-201 d is an epic exoplanet

TOI-201 d 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, Tidally locked, Denser than iron, 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.