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Rare exoplanet 47 EP

Kepler-245 b

RA 291.6390° · Dec 42.4363° · exoplanet

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Score breakdown

· 7 badges
47 pts · Rare
Rare 50 pts → Epic
  • Puffy low-density world +12
  • Tidally locked +10
  • Distant (over 1,000 light-years) +6
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Sub-Neptune +5
  • Found by Kepler +3
Total score 47

3 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • Distant (over 1,000 light-years) · +6
  • Sub-Neptune · +5
  • Tidally locked · +10
  • Puffy low-density world · +12
  • Multi-planet system · +6
  • Found by Kepler · +3

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 4 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 15.5 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.

Properties

density gcc
0.12
diameter km
32783.434
discovery facility
Kepler
discovery method
Transit
discovery year
2014
dist ly
2809.922
eccentricity
0
eq temp k
753
host star teff
5100
inclination
89.95
insolation
77.749
mag
15.546
mass earth
146.78
name
Kepler-245 b
orbital period days
7.4902
radius earth
2.57
semi major au
0.071
sys num planets
4
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About Kepler-245 b

Kepler-245 b is a rare exoplanet. It lies about 2,809.9 light-years from Earth, shines at apparent magnitude 15.55, has an equilibrium temperature near 753 K and spans roughly 2.57 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 15.55, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, Kepler-245 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-245 b is a rare exoplanet

Kepler-245 b scores 47 points on Spacedle's rarity scale, which places it in the rare tier. Another 3 points would lift it into a rarer tier.

That score comes from 7 science badges — Confirmed exoplanet, Distant (over 1,000 light-years), Sub-Neptune, Tidally locked, Puffy low-density world, Multi-planet system and Found by Kepler — 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.