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Rare exoplanet 45 EP

K2-211 b

RA 21.1062° · Dec 1.7049° · exoplanet

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Score breakdown

· 5 badges
45 pts · Rare
Rare 50 pts → Epic
  • Lava world +14
  • Ultra-short period +14
  • Super-Earth +8
  • Confirmed exoplanet +5
  • Blasted by starlight +4
Total score 45

5 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • Super-Earth · +8
  • Lava world · +14
  • Ultra-short period · +14
  • Blasted by starlight · +4

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 16.1 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.
  • 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.

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 13.2 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 October — that's when to go looking.

Properties

density gcc
5.42
diameter km
16986.4992
discovery facility
K2
discovery method
Transit
discovery year
2018
dist ly
888.113
eccentricity
0.19
eq temp k
1873
host star teff
5117
inclination
84.1
insolation
2056.0589
mag
13.1547
mass earth
2.33
name
K2-211 b
orbital period days
0.6696
radius earth
1.3316
semi major au
0.0142
sys num planets
1
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About K2-211 b

K2-211 b is a rare exoplanet. It lies about 888.1 light-years from Earth, shines at apparent magnitude 13.15, has an equilibrium temperature near 1,873 K and spans roughly 1.33 Earth radii.

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

How to see it

At apparent magnitude 13.15, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, K2-211 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 K2-211 b is a rare exoplanet

K2-211 b scores 45 points on Spacedle's rarity scale, which places it in the rare tier. Another 5 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Super-Earth, Lava world, Ultra-short period and Blasted by starlight — 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.