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Common exoplanet 19 EP

K2-198 c

RA 198.8437° · Dec -6.4650° · exoplanet

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Score breakdown

· 3 badges
19 pts · Common
Common 22 pts → Uncommon
  • Super-Earth +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
Total score 19

3 more points to reach Uncommon.

Badges

  • Confirmed exoplanet · +5
  • Super-Earth · +8
  • Multi-planet system · +6

Trivia

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 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 11 you'll want a small backyard telescope.
  • Seen from everywhere. It sits almost on the celestial equator, so it can be seen from essentially anywhere on Earth.
  • Best time of year. It stands highest in the middle of the night around April — that's when to go looking.

Could we get there?

  • Verdict. Hopelessly far for any craft humanity can build today.

Properties

density gcc
4.98
diameter km
18152.0726
discovery facility
K2
discovery method
Transit
discovery year
2019
dist ly
360.6209
eq temp k
1229.9
host star teff
5212.9
inclination
86.494
mag
10.971
mass earth
2.61
name
K2-198 c
orbital period days
3.3596
radius earth
1.423
sys num planets
3
sys num stars
1

About K2-198 c

K2-198 c is a common exoplanet. It lies about 360.6 light-years from Earth, shines at apparent magnitude 10.97, has an equilibrium temperature near 1,230 K and spans roughly 1.42 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 10.97, a small backyard telescope will bring it into view.

Like any astronomical target, K2-198 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 K2-198 c is a common exoplanet

K2-198 c scores 19 points on Spacedle's rarity scale, which places it in the common tier. Another 3 points would lift it into a rarer tier.

That score comes from 3 science badges — Confirmed exoplanet, Super-Earth 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.