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Rare exoplanet 49 EP

Kepler-451 d

RA 294.6359° · Dec 46.0664° · exoplanet

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Score breakdown

· 6 badges
49 pts · Rare
Rare 50 pts → Epic
  • Circumbinary (orbits both stars) +14
  • Orbits a hot blue-white star +14
  • Distant (over 1,000 light-years) +6
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 49

1 more point to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • Distant (over 1,000 light-years) · +6
  • Gas giant · +4
  • Multi-planet system · +6
  • Circumbinary (orbits both stars) · +14
  • Orbits a hot blue-white star · +14

Trivia

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. Lighter than Neptune — a puffed-up ball of hydrogen and helium with no surface anywhere on it to stand on.
  • 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 12.7 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

circumbinary
yes
density gcc
1.25
diameter km
172208.7
discovery facility
Multiple Observatories
discovery method
Eclipse Timing Variations
discovery year
2022
dist ly
1292.6606
eccentricity
0
host star teff
29564
mag
12.651
mass earth
559.378
name
Kepler-451 d
orbital period days
43
radius earth
13.5
sys num planets
3
sys num stars
2

About Kepler-451 d

Kepler-451 d is a rare exoplanet. It lies about 1,292.7 light-years from Earth, shines at apparent magnitude 12.65, spans roughly 13.5 Earth radii and weighs about 559.38 Earth masses.

It orbits closer to its star than Mercury does to the Sun, completing a lap in less time than Mercury takes.

How to see it

At apparent magnitude 12.65, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, Kepler-451 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-451 d is a rare exoplanet

Kepler-451 d scores 49 points on Spacedle's rarity scale, which places it in the rare tier. Another 1 point would lift it into a rarer tier.

That score comes from 6 science badges — Confirmed exoplanet, Distant (over 1,000 light-years), Gas giant, Multi-planet system, Circumbinary (orbits both stars) and Orbits a hot blue-white star — 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.