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Epic exoplanet 58 EP

Kepler-390 b

RA 291.6288° · Dec 41.2088° · exoplanet

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Score breakdown

· 7 badges
58 pts · Epic
Epic 78 pts → Anomaly
  • Earth-sized +16
  • Two suns in its sky +12
  • Tidally locked +10
  • Distant (over 1,000 light-years) +6
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Found by Kepler +3
Total score 58

20 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Distant (over 1,000 light-years) · +6
  • Earth-sized · +16
  • Tidally locked · +10
  • Multi-planet system · +6
  • Found by Kepler · +3
  • Two suns in its sky · +12

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. Its density says rock, though lighter than Earth's mix: probably less iron, or a thick shell of water and ice over the top.
  • 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 14.2 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
4.75
diameter km
10460.084
discovery facility
Kepler
discovery method
Transit
discovery year
2014
dist ly
1419.6821
eccentricity
0
eq temp k
786
host star teff
5166
inclination
89.57
insolation
99.972
mag
14.231
mass earth
0.477
multi star system
yes
name
Kepler-390 b
orbital period days
6.7381
radius earth
0.82
semi major au
0.065
sys num planets
2
sys num stars
2
tidally locked
yes
tidally locked inferred
yes

About Kepler-390 b

Kepler-390 b is an epic exoplanet. It lies about 1,419.7 light-years from Earth, shines at apparent magnitude 14.23, has an equilibrium temperature near 786 K and spans roughly 0.82 Earth radii.

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

Like any astronomical target, Kepler-390 b 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-390 b is an epic exoplanet

Kepler-390 b scores 58 points on Spacedle's rarity scale, which places it in the epic tier. Another 20 points would lift it into a rarer tier.

That score comes from 7 science badges — Confirmed exoplanet, Distant (over 1,000 light-years), Earth-sized, Tidally locked, Multi-planet system, Found by Kepler and Two suns in its sky — 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.