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Rare exoplanet 39 EP

K2-413 b

RA 353.4176° · Dec -7.6120° · exoplanet

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Score breakdown

· 4 badges
39 pts · Rare
Rare 50 pts → Epic
  • Lava world +14
  • Ultra-short period +14
  • Multi-planet system +6
  • Confirmed exoplanet +5
Total score 39

11 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • Lava world · +14
  • Ultra-short period · +14
  • Multi-planet system · +6

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 19.4 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.
  • Crowded system. One of at least 2 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 15 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
4.55
diameter km
9693.4364
discovery facility
K2
discovery method
Transit
discovery year
2022
dist ly
930.073
eq temp k
1535.2
host star teff
4116
inclination
89.9518
insolation
921.755
mag
15.013
mass earth
0.363
name
K2-413 b
orbital period days
0.8094
radius earth
0.7599
semi major au
0.0117
sys num planets
2
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About K2-413 b

K2-413 b is a rare exoplanet. It lies about 930.1 light-years from Earth, shines at apparent magnitude 15.01, has an equilibrium temperature near 1,535 K and spans roughly 0.76 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 15.01, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, K2-413 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 K2-413 b is a rare exoplanet

K2-413 b scores 39 points on Spacedle's rarity scale, which places it in the rare tier. Another 11 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Lava world, Ultra-short period 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.