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Rare exoplanet 40 EP

Kepler-1909 b

RA 290.8894° · Dec 42.4596° · exoplanet

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Score breakdown

· 5 badges
40 pts · Rare
Rare 50 pts → Epic
  • Earth-sized +16
  • Tidally locked +10
  • Distant (over 1,000 light-years) +6
  • Confirmed exoplanet +5
  • Found by Kepler +3
Total score 40

10 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • Distant (over 1,000 light-years) · +6
  • Earth-sized · +16
  • Tidally locked · +10
  • Found by Kepler · +3

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.

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 15.9 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
5.61
diameter km
13931.9914
discovery facility
Kepler
discovery method
Transit
discovery year
2021
dist ly
2490.7294
eccentricity
0
eq temp k
1031
host star teff
4935
inclination
88.15
insolation
266.01
mag
15.933
mass earth
1.33
name
Kepler-1909 b
orbital period days
2.3916
radius earth
1.0922
semi major au
0.0306
sys num planets
1
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About Kepler-1909 b

Kepler-1909 b is a rare exoplanet. It lies about 2,490.7 light-years from Earth, shines at apparent magnitude 15.93, has an equilibrium temperature near 1,031 K and spans roughly 1.09 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 15.93, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, Kepler-1909 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-1909 b is a rare exoplanet

Kepler-1909 b scores 40 points on Spacedle's rarity scale, which places it in the rare 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), Earth-sized, Tidally locked 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.