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Epic exoplanet 75 EP

K2-131 b

RA 182.7514° · Dec -9.7652° · exoplanet

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Score breakdown

· 6 badges
75 pts · Epic
Epic 78 pts → Anomaly
  • Ultra-hot Jupiter +26
  • Denser than iron +18
  • Ultra-short period +14
  • Super-Earth +8
  • Confirmed exoplanet +5
  • Blasted by starlight +4
Total score 75

3 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Super-Earth · +8
  • Ultra-hot Jupiter · +26
  • Ultra-short period · +14
  • Denser than iron · +18
  • Blasted by starlight · +4

Trivia

What makes it special

  • Ultra-hot Jupiter. So hot that iron vaporises on the dayside, blows around to the night side and rains back down as molten metal.

Hard to believe

  • Denser than iron. It is packed tighter than solid iron — whatever it is made of, it is not ordinary rock.
  • A year in a day. Its entire year is over in 8.9 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. Denser than Earth — a solid world of rock and iron, with no meaningful atmosphere to speak of by mass.

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 12.1 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.

Properties

density gcc
8.8
diameter km
21557.978
discovery facility
K2
discovery method
Transit
discovery year
2017
dist ly
497.4173
eccentricity
0
eq temp k
2223
host star teff
5120
inclination
85
insolation
4070
mag
12.129
mass earth
7.9
name
K2-131 b
orbital period days
0.3693
radius earth
1.69
semi major au
0.0094
sys num planets
1
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About K2-131 b

K2-131 b is an epic exoplanet. It lies about 497.4 light-years from Earth, shines at apparent magnitude 12.13, has an equilibrium temperature near 2,223 K and spans roughly 1.69 Earth radii.

So hot that iron vaporises on the dayside, blows around to the night side and rains back down as molten metal.

How to see it

At apparent magnitude 12.13, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, K2-131 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 K2-131 b is an epic exoplanet

K2-131 b scores 75 points on Spacedle's rarity scale, which places it in the epic tier. Another 3 points would lift it into a rarer tier.

That score comes from 6 science badges — Confirmed exoplanet, Super-Earth, Ultra-hot Jupiter, Ultra-short period, Denser than iron 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.