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Uncommon exoplanet 30 EP

Kepler-447 b

RA 285.2685° · Dec 48.5599° · exoplanet

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Score breakdown

· 5 badges
30 pts · Uncommon
Uncommon 34 pts → Rare
  • Tidally locked +10
  • Orbits a Sun-like star +8
  • Confirmed exoplanet +5
  • Gas giant +4
  • Found by Kepler +3
Total score 30

4 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Tidally locked · +10
  • 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.

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 12.5 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. Hopelessly far for any craft humanity can build today.

Properties

density gcc
0.4
diameter km
235862.138
discovery facility
Kepler
discovery method
Transit
discovery year
2015
dist ly
874.2318
eccentricity
0.123
eq temp k
882
host star teff
5493
inclination
86.55
insolation
119.039
mag
12.52
mass earth
435.41
name
Kepler-447 b
orbital period days
7.7943
radius earth
18.49
semi major au
0.0769
spect
G8 V
sys num planets
1
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About Kepler-447 b

Kepler-447 b is an uncommon exoplanet. It lies about 874.2 light-years from Earth, shines at apparent magnitude 12.52, has spectral type G8 V and has an equilibrium temperature near 882 K.

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

Like any astronomical target, Kepler-447 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-447 b is an uncommon exoplanet

Kepler-447 b scores 30 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 4 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Gas giant, Tidally locked, 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.