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Rare exoplanet 49 EP

K2-136 b

RA 67.4129° · Dec 22.8826° · exoplanet

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Score breakdown

· 5 badges
49 pts · Rare
Rare 50 pts → Epic
  • Earth-sized +16
  • Two suns in its sky +12
  • Tidally locked +10
  • Multi-planet system +6
  • Confirmed exoplanet +5
Total score 49

1 more point to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • Earth-sized · +16
  • Tidally locked · +10
  • Multi-planet system · +6
  • Two suns in its sky · +12

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.

Hard to believe

  • Denser than iron. It is packed tighter than solid iron — whatever it is made of, it is not ordinary rock.

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 3 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 11.1 you'll want a small backyard telescope.
  • Northern sky. It rides the northern half of the sky — an easier target the further north you are.

Properties

density gcc
24
diameter km
12934.7868
discovery facility
K2
discovery method
Transit
discovery year
2017
dist ly
193.2389
eccentricity
0.14
eq temp k
610
host star teff
4500
inclination
89.2
insolation
33.5
mag
11.101
mass earth
4.3
multi star system
yes
name
K2-136 b
orbital period days
7.9752
radius earth
1.014
semi major au
0.0707
spect
K5.5
sys num planets
3
sys num stars
2
tidally locked
yes
tidally locked inferred
yes

About K2-136 b

K2-136 b is a rare exoplanet. It lies about 193.2 light-years from Earth, shines at apparent magnitude 11.1, has spectral type K5.5 and has an equilibrium temperature near 610 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 11.1, a small backyard telescope will bring it into view.

Like any astronomical target, K2-136 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 K2-136 b is a rare exoplanet

K2-136 b scores 49 points on Spacedle's rarity scale, which places it in the rare tier. Another 1 point would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Earth-sized, Tidally locked, Multi-planet system 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.