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Epic exoplanet 50 EP

K2-22 b

RA 169.4827° · Dec 2.6190° · exoplanet

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Score breakdown

· 5 badges
50 pts · Epic
Epic 78 pts → Anomaly
  • Lava world +14
  • Ultra-short period +14
  • Two suns in its sky +12
  • Confirmed exoplanet +5
  • Sub-Neptune +5
Total score 50

28 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Sub-Neptune · +5
  • Lava world · +14
  • Ultra-short period · +14
  • Two suns in its sky · +12

Trivia

What makes it special

  • Lava world. Its surface is almost certainly an ocean of molten rock, kept liquid by the star it hugs.

Hard to believe

  • A year in a day. Its entire year is over in 9.1 hours. Birthdays here would come round faster than meals.

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.

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 15.6 it is far too faint for the eye: this one belongs to cameras and long exposures.
  • 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 March — that's when to go looking.

Could we get there?

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

Properties

diameter km
29339.26
discovery facility
K2
discovery method
Transit
discovery year
2015
dist ly
795.2857
eccentricity
0.19
eq temp k
2100
host star teff
3879
inclination
90.6
insolation
114
mag
15.565
mass earth
444.962
multi star system
yes
name
K2-22 b
orbital period days
0.3811
radius earth
2.3
semi major au
0.009
spect
M0 V
sys num planets
1
sys num stars
2
tidally locked
yes
tidally locked inferred
yes

About K2-22 b

K2-22 b is an epic exoplanet. It lies about 795.3 light-years from Earth, shines at apparent magnitude 15.56, has spectral type M0 V and has an equilibrium temperature near 2,100 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 15.56, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, K2-22 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 K2-22 b is an epic exoplanet

K2-22 b scores 50 points on Spacedle's rarity scale, which places it in the epic tier. Another 28 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Sub-Neptune, Lava world, Ultra-short period and Two suns in its sky — 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.