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Uncommon exoplanet 27 EP

Kepler-25 d

RA 286.6384° · Dec 39.4879° · exoplanet

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Score breakdown

· 4 badges
27 pts · Uncommon
Uncommon 34 pts → Rare
  • Two suns in its sky +12
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 27

7 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Multi-planet system · +6
  • Two suns in its sky · +12

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

  • 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 10.8 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.
  • 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
0.395
diameter km
127562
discovery facility
W. M. Keck Observatory
discovery method
Radial Velocity
discovery year
2014
dist ly
793.3712
eccentricity
0.13
eq temp k
544.68
host star teff
6354
insolation
15.2243
mag
10.769
mass earth
71.9
multi star system
yes
name
Kepler-25 d
orbital period days
122.4
radius earth
10
semi major au
0.4164
spect
F8
sys num planets
3
sys num stars
2

About Kepler-25 d

Kepler-25 d is an uncommon exoplanet. It lies about 793.4 light-years from Earth, shines at apparent magnitude 10.77, has spectral type F8 and has an equilibrium temperature near 545 K.

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

How to see it

At apparent magnitude 10.77, a small backyard telescope will bring it into view.

Like any astronomical target, Kepler-25 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-25 d is an uncommon exoplanet

Kepler-25 d scores 27 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 7 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Gas giant, Multi-planet system and Two suns in its sky — 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.