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Epic exoplanet 67 EP

K2-229 b

RA 186.8729° · Dec -6.7218° · exoplanet

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Score breakdown

· 7 badges
67 pts · Epic
Epic 78 pts → Anomaly
  • Earth-sized +16
  • Lava world +14
  • Ultra-short period +14
  • Orbits a Sun-like star +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Blasted by starlight +4
Total score 67

11 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Earth-sized · +16
  • Lava world · +14
  • Ultra-short period · +14
  • Multi-planet system · +6
  • Blasted by starlight · +4
  • Orbits a Sun-like star · +8

Trivia

What makes it special

  • Earth-sized. Genuinely comparable to Earth in size. Worlds in this narrow band are the ones every next-generation telescope is being pointed at.
  • 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 14 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.
  • 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 11 you'll want a small backyard telescope.

Properties

density gcc
7.6
diameter km
12756.2
discovery facility
K2
discovery method
Transit
discovery year
2018
dist ly
334.5186
eccentricity
0
eq temp k
1818
host star teff
5315
inclination
89.7
insolation
2290
mag
10.985
mass earth
2.55
name
K2-229 b
orbital period days
0.5842
radius earth
1
semi major au
0.0131
spect
G9
sys num planets
2
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About K2-229 b

K2-229 b is an epic exoplanet. It lies about 334.5 light-years from Earth, shines at apparent magnitude 10.98, has spectral type G9 and has an equilibrium temperature near 1,818 K.

Genuinely comparable to Earth in size. Worlds in this narrow band are the ones every next-generation telescope is being pointed at.

How to see it

At apparent magnitude 10.98, a small backyard telescope will bring it into view.

Like any astronomical target, K2-229 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 K2-229 b is an epic exoplanet

K2-229 b scores 67 points on Spacedle's rarity scale, which places it in the epic tier. Another 11 points would lift it into a rarer tier.

That score comes from 7 science badges — Confirmed exoplanet, Earth-sized, Lava world, Ultra-short period, Multi-planet system, Blasted by starlight and Orbits a Sun-like star — 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.