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Rare exoplanet 48 EP

Kepler-446 c

RA 282.2501° · Dec 44.9210° · exoplanet

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Score breakdown

· 6 badges
48 pts · Rare
Rare 50 pts → Epic
  • Earth-sized +16
  • Tidally locked +10
  • Orbits a red dwarf +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Found by Kepler +3
Total score 48

2 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • Earth-sized · +16
  • Tidally locked · +10
  • Multi-planet system · +6
  • Found by Kepler · +3
  • Orbits a red dwarf · +8

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.

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 17.5 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
5.67
diameter km
14159.382
discovery facility
Kepler
discovery method
Transit
discovery year
2015
dist ly
314.2154
eccentricity
0
eq temp k
520
host star teff
3359
inclination
88.97
insolation
6.705
mag
17.5041
mass earth
1.41
name
Kepler-446 c
orbital period days
3.0362
radius earth
1.11
semi major au
0.0283
spect
M4
sys num planets
3
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About Kepler-446 c

Kepler-446 c is a rare exoplanet. It lies about 314.2 light-years from Earth, shines at apparent magnitude 17.5, has spectral type M4 and has an equilibrium temperature near 520 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 17.5, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, Kepler-446 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-446 c is a rare exoplanet

Kepler-446 c scores 48 points on Spacedle's rarity scale, which places it in the rare tier. Another 2 points would lift it into a rarer tier.

That score comes from 6 science badges — Confirmed exoplanet, Earth-sized, Tidally locked, Multi-planet system, Found by Kepler and Orbits a red dwarf — 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.