← Back to dex
Rare exoplanet 47 EP

K2-233 c

RA 230.4799° · Dec -20.2318° · exoplanet

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

Computing the sky for your location…

Score breakdown

· 5 badges
47 pts · Rare
Rare 50 pts → Epic
  • Denser than iron +18
  • Tidally locked +10
  • Super-Earth +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
Total score 47

3 more points to reach Epic.

Badges

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

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 10.9 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 May — that's when to go looking.

Properties

density gcc
12.4
diameter km
16225.8864
discovery facility
K2
discovery method
Transit
discovery year
2018
dist ly
220.1755
eccentricity
0
eq temp k
794
host star teff
4796
inclination
89.57
insolation
66.2
mag
10.883
mass earth
4.6
name
K2-233 c
orbital period days
7.0602
radius earth
1.272
semi major au
0.0664
spect
K3
sys num planets
3
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About K2-233 c

K2-233 c is a rare exoplanet. It lies about 220.2 light-years from Earth, shines at apparent magnitude 10.88, has spectral type K3 and has an equilibrium temperature near 794 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 10.88, a small backyard telescope will bring it into view.

Like any astronomical target, K2-233 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 K2-233 c is a rare exoplanet

K2-233 c 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 5 science badges — Confirmed exoplanet, Super-Earth, Tidally locked, Denser than iron and Multi-planet system — 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.