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Uncommon exoplanet 24 EP

Kepler-458 c

RA 297.0454° · Dec 46.3287° · exoplanet

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Score breakdown

· 5 badges
24 pts · Uncommon
Uncommon 34 pts → Rare
  • Distant (over 1,000 light-years) +6
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Neptune-like +4
  • Found by Kepler +3
Total score 24

10 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Distant (over 1,000 light-years) · +6
  • Neptune-like · +4
  • Multi-planet system · +6
  • Found by Kepler · +3

Trivia

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 14 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.

Could we get there?

  • Verdict. Impossible with our current technology — and the next millennium of it.

Properties

density gcc
1.22
diameter km
53576.04
discovery facility
Kepler
discovery method
Transit
discovery year
2016
dist ly
5201.3402
eccentricity
0
eq temp k
798
host star teff
6117.21
inclination
88.27
insolation
279.787
mag
14.027
mass earth
16.4
name
Kepler-458 c
orbital period days
20.7403
radius earth
4.2
semi major au
0.1701
sys num planets
2
sys num stars
1

About Kepler-458 c

Kepler-458 c is an uncommon exoplanet. It lies about 5,201.3 light-years from Earth, shines at apparent magnitude 14.03, has an equilibrium temperature near 798 K and spans roughly 4.2 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 14.03, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, Kepler-458 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-458 c is an uncommon exoplanet

Kepler-458 c scores 24 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 10 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Distant (over 1,000 light-years), Neptune-like, Multi-planet 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.