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Epic exoplanet 52 EP

Kepler-33 d

RA 289.0775° · Dec 46.0052° · exoplanet

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Score breakdown

· 7 badges
52 pts · Epic
Epic 78 pts → Anomaly
  • Richly packed system +14
  • Puffy low-density world +12
  • Orbits a Sun-like star +8
  • Distant (over 1,000 light-years) +6
  • Confirmed exoplanet +5
  • Neptune-like +4
  • Found by Kepler +3
Total score 52

26 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Distant (over 1,000 light-years) · +6
  • Neptune-like · +4
  • Puffy low-density world · +12
  • Richly packed system · +14
  • Found by Kepler · +3
  • Orbits a Sun-like star · +8

Trivia

Hard to believe

  • It would float. It is less dense than water. Drop it in a big enough ocean and the whole world would bob on the surface.

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 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 14.1 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.
  • Best time of year. It stands highest in the middle of the night around July — that's when to go looking.

Properties

density gcc
0.25
diameter km
68245.67
discovery facility
Kepler
discovery method
Transit
discovery year
2011
dist ly
3943.7479
eccentricity
0
eq temp k
853
host star teff
5904
inclination
88.71
insolation
123.691
mag
14.099
mass earth
3.91
name
Kepler-33 d
orbital period days
21.776
radius earth
5.35
semi major au
0.1662
sys num planets
5
sys num stars
1

About Kepler-33 d

Kepler-33 d is an epic exoplanet. It lies about 3,943.7 light-years from Earth, shines at apparent magnitude 14.1, has an equilibrium temperature near 853 K and spans roughly 5.35 Earth radii.

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

Like any astronomical target, Kepler-33 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-33 d is an epic exoplanet

Kepler-33 d scores 52 points on Spacedle's rarity scale, which places it in the epic tier. Another 26 points would lift it into a rarer tier.

That score comes from 7 science badges — Confirmed exoplanet, Distant (over 1,000 light-years), Neptune-like, Puffy low-density world, Richly packed system, Found by Kepler and Orbits a Sun-like 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.