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Uncommon exoplanet 28 EP

Kepler-747 b

RA 288.4165° · Dec 41.0298° · exoplanet

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Score breakdown

· 5 badges
28 pts · Uncommon
Uncommon 34 pts → Rare
  • Disputed — it may not be there at all +10
  • Distant (over 1,000 light-years) +6
  • Confirmed exoplanet +5
  • Neptune-like +4
  • Found by Kepler +3
Total score 28

6 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Distant (over 1,000 light-years) · +6
  • Neptune-like · +4
  • Found by Kepler · +3
  • Disputed — it may not be there at all · +10

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.

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 15.6 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

controversial
yes
density gcc
0.905
diameter km
67225.174
discovery facility
Kepler
discovery method
Transit
discovery year
2016
dist ly
10916.9632
eccentricity
0
eq temp k
456
host star teff
5096
inclination
89.98
insolation
10.19
mag
15.595
mass earth
24.1
name
Kepler-747 b
orbital period days
35.6176
radius earth
5.27
semi major au
0.1916
sys num planets
1
sys num stars
1

About Kepler-747 b

Kepler-747 b is an uncommon exoplanet. It lies about 10,917 light-years from Earth, shines at apparent magnitude 15.6, has an equilibrium temperature near 456 K and spans roughly 5.27 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 15.6, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, Kepler-747 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-747 b is an uncommon exoplanet

Kepler-747 b scores 28 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 6 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Distant (over 1,000 light-years), Neptune-like, Found by Kepler and Disputed — it may not be there at all — 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.