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Epic exoplanet 56 EP

Kepler-102 d

RA 281.4825° · Dec 47.2078° · exoplanet

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Score breakdown

· 5 badges
56 pts · Epic
Epic 78 pts → Anomaly
  • Denser than iron +18
  • Earth-sized +16
  • Richly packed system +14
  • Confirmed exoplanet +5
  • Found by Kepler +3
Total score 56

22 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Earth-sized · +16
  • Denser than iron · +18
  • Richly packed system · +14
  • 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.

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 12.1 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.

Properties

density gcc
10.7
diameter km
14720.6548
discovery facility
Kepler
discovery method
Transit
discovery year
2014
dist ly
351.5831
eccentricity
0.092
eq temp k
686
host star teff
4909
inclination
89.49
insolation
36.9
mag
12.072
mass earth
3
name
Kepler-102 d
orbital period days
10.3118
radius earth
1.154
semi major au
0.0862
sys num planets
5
sys num stars
1

About Kepler-102 d

Kepler-102 d is an epic exoplanet. It lies about 351.6 light-years from Earth, shines at apparent magnitude 12.07, has an equilibrium temperature near 686 K and spans roughly 1.15 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 12.07, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, Kepler-102 d 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-102 d is an epic exoplanet

Kepler-102 d scores 56 points on Spacedle's rarity scale, which places it in the epic tier. Another 22 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Earth-sized, Denser than iron, 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.