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Rare exoplanet 41 EP

Kepler-11 c

RA 297.1151° · Dec 41.9091° · exoplanet

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Score breakdown

· 6 badges
41 pts · Rare
Rare 50 pts → Epic
  • Richly packed system +14
  • Orbits a Sun-like star +8
  • Distant (over 1,000 light-years) +6
  • Confirmed exoplanet +5
  • Sub-Neptune +5
  • Found by Kepler +3
Total score 41

9 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • Distant (over 1,000 light-years) · +6
  • Sub-Neptune · +5
  • Richly packed system · +14
  • Found by Kepler · +3
  • Orbits a Sun-like star · +8

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 6 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 13.8 it is far too faint for the eye: this one belongs to cameras and long exposures.
  • Northern sky. It rides the northern half of the sky — an easier target the further north you are.
  • Best time of year. It stands highest in the middle of the night around July — that's when to go looking.

Properties

density gcc
0.66
diameter km
36610.294
discovery facility
Kepler
discovery method
Transit
discovery year
2010
dist ly
2108.0963
eccentricity
0.026
eq temp k
786
host star teff
5663
inclination
89.59
insolation
107.224
mag
13.817
mass earth
2.9
name
Kepler-11 c
orbital period days
13.0241
radius earth
2.87
semi major au
0.107
sys num planets
6
sys num stars
1

About Kepler-11 c

Kepler-11 c is a rare exoplanet. It lies about 2,108.1 light-years from Earth, shines at apparent magnitude 13.82, has an equilibrium temperature near 786 K and spans roughly 2.87 Earth radii.

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 13.82, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, Kepler-11 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 Kepler-11 c is a rare exoplanet

Kepler-11 c scores 41 points on Spacedle's rarity scale, which places it in the rare tier. Another 9 points would lift it into a rarer tier.

That score comes from 6 science badges — Confirmed exoplanet, Distant (over 1,000 light-years), Sub-Neptune, Richly packed system, Found by Kepler 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.