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Uncommon exoplanet 29 EP

TOI-1533 c

RA 355.2467° · Dec 57.4852° · exoplanet

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Score breakdown

· 5 badges
29 pts · Uncommon
Uncommon 34 pts → Rare
  • Tidally locked +10
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Gas giant +4
  • Found by TESS +4
Total score 29

5 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Tidally locked · +10
  • Multi-planet system · +6
  • Found by TESS · +4

Trivia

Hard to believe

  • It would float. It is less dense than water. Drop it in a big enough ocean and the whole world would bob on the surface.

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. Lighter than Neptune — a puffed-up ball of hydrogen and helium with no surface anywhere on it to stand on.
  • 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 you'll want a small backyard telescope.
  • Northern sky. It rides the northern half of the sky — an easier target the further north 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
0.48
diameter km
95671.5
discovery facility
Transiting Exoplanet Survey Satellite (TESS)
discovery method
Transit
discovery year
2026
dist ly
326.3223
eccentricity
0
eq temp k
628
host star teff
5146
inclination
86.64
insolation
25.9007
mag
10.953
mass earth
36.6
name
TOI-1533 c
orbital period days
8.0638
radius earth
7.5
semi major au
0.076
sys num planets
2
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About TOI-1533 c

TOI-1533 c is an uncommon exoplanet. It lies about 326.3 light-years from Earth, shines at apparent magnitude 10.95, has an equilibrium temperature near 628 K and spans roughly 7.5 Earth radii.

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 10.95, a small backyard telescope will bring it into view.

Like any astronomical target, TOI-1533 c 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-1533 c is an uncommon exoplanet

TOI-1533 c scores 29 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 5 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Gas giant, 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.