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Rare exoplanet 37 EP

K2-141 c

RA 350.9170° · Dec -1.1892° · exoplanet

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Score breakdown

· 5 badges
37 pts · Rare
Rare 50 pts → Epic
  • Puffy low-density world +12
  • Tidally locked +10
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 37

13 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Tidally locked · +10
  • Puffy low-density world · +12
  • Multi-planet system · +6

Trivia

Hard to believe

  • It would float. It is less dense than water. Drop it in a big enough ocean and the whole world would bob on the surface.

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. Lighter than Neptune — a puffed-up ball of hydrogen and helium with no surface anywhere on it to stand on.
  • 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 11.5 you'll want a small backyard telescope.
  • 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 September — that's when to go looking.

Properties

density gcc
0.081
diameter km
89293.4
discovery facility
K2
discovery method
Transit
discovery year
2018
dist ly
201.8045
eccentricity
0.092
eq temp k
695
host star teff
4570
inclination
87.2
insolation
39.1
mag
11.454
mass earth
8
name
K2-141 c
orbital period days
7.7485
radius earth
7
semi major au
0.0683
spect
K7 V
sys num planets
2
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About K2-141 c

K2-141 c is a rare exoplanet. It lies about 201.8 light-years from Earth, shines at apparent magnitude 11.45, has spectral type K7 V and has an equilibrium temperature near 695 K.

It orbits closer to its star than Mercury does to the Sun, completing a lap in less time than Mercury takes.

How to see it

At apparent magnitude 11.45, a small backyard telescope will bring it into view.

Like any astronomical target, K2-141 c 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 K2-141 c is a rare exoplanet

K2-141 c scores 37 points on Spacedle's rarity scale, which places it in the rare tier. Another 13 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Gas giant, Tidally locked, Puffy low-density world 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.