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Rare exoplanet 46 EP

Kepler-450 d

RA 295.4866° · Dec 51.0135° · exoplanet

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Score breakdown

· 6 badges
46 pts · Rare
Rare 50 pts → Epic
  • Earth-sized +16
  • Tidally locked +10
  • Distant (over 1,000 light-years) +6
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Found by Kepler +3
Total score 46

4 more points to reach Epic.

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

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 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 12 you'll want a small backyard telescope.
  • Northern sky. It rides the northern half of the sky — an easier target the further north you are.

Properties

density gcc
77
diameter km
10676.9394
discovery facility
Kepler
discovery method
Transit
discovery year
2015
dist ly
1487.2127
eccentricity
0.14
eq temp k
1199
host star teff
6197.21
inclination
87.91
insolation
557.205
mag
11.991
mass earth
17.6
name
Kepler-450 d
orbital period days
7.5146
radius earth
0.837
semi major au
0.0827
sys num planets
3
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About Kepler-450 d

Kepler-450 d is a rare exoplanet. It lies about 1,487.2 light-years from Earth, shines at apparent magnitude 11.99, has an equilibrium temperature near 1,199 K and spans roughly 0.84 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 11.99, a small backyard telescope will bring it into view.

Like any astronomical target, Kepler-450 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-450 d is a rare exoplanet

Kepler-450 d scores 46 points on Spacedle's rarity scale, which places it in the rare tier. Another 4 points would lift it into a rarer tier.

That score comes from 6 science badges — Confirmed exoplanet, Distant (over 1,000 light-years), Earth-sized, Tidally locked, 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.