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Uncommon exoplanet 33 EP

Kepler-55 c

RA 285.1683° · Dec 44.0265° · exoplanet

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Score breakdown

· 5 badges
33 pts · Uncommon
Uncommon 34 pts → Rare
  • Richly packed system +14
  • Distant (over 1,000 light-years) +6
  • Confirmed exoplanet +5
  • Sub-Neptune +5
  • Found by Kepler +3
Total score 33

1 more point to reach Rare.

Badges

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

Trivia

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 5 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 15.7 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
35.5
diameter km
28191.202
discovery facility
Kepler
discovery method
Transit
discovery year
2012
dist ly
1887.7779
eccentricity
0
eq temp k
349
host star teff
4362
inclination
89.96
insolation
3.84
mag
15.746
mass earth
69.8
name
Kepler-55 c
orbital period days
42.1516
radius earth
2.21
semi major au
0.2095
sys num planets
5
sys num stars
1

About Kepler-55 c

Kepler-55 c is an uncommon exoplanet. It lies about 1,887.8 light-years from Earth, shines at apparent magnitude 15.75, has an equilibrium temperature near 349 K and spans roughly 2.21 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 15.75, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, Kepler-55 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-55 c is an uncommon exoplanet

Kepler-55 c scores 33 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 1 point would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Distant (over 1,000 light-years), Sub-Neptune, Richly packed system and Found by Kepler — 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.