Rare exoplanet 44 EP

Kepler-4 b

RA 285.6154° · Dec 50.1358° · exoplanet

Loading sky survey…

🌌 View in 3D star map

Tonight’s visibility

Computing the sky for your location…

Score breakdown

· 6 badges

44 pts · Rare

Rare 46 pts → Epic

Lava world +14
Distant (>1000 ly) +10
Blasted by starlight +8
Confirmed exoplanet +5
Neptune-like +4
Found by Kepler +3

Total score 44

2 more points to reach Epic.

Badges

Confirmed exoplanet · +5
Neptune-like · +4
Lava world · +14
Blasted by starlight · +8
Found by Kepler · +3
Distant (>1000 ly) · +10

Trivia

What makes it special

Lava world. Its surface is likely an ocean of molten rock.

Could we get there?

Verdict. Impossible with our current technology — and the next millennium of it.

Getting there

Aboard Voyager 1. ≈ 28 million years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 2.5 million years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 15.9 thousand years in a starship at a tenth of light speed.
Distance. 1591 light-years from Earth.

Look-back time

Look-back time. The light you'd see left around the year 435.

Saying hello

Say hello. A radio message and its reply would take 3183 years round-trip.

Standing on it

A year here. A full year lasts just 3.2 Earth days.

By the numbers

Size. About 4× the width of Earth.
Volume. About 64.1 Earths could fit inside it.
Mass. About 24.5× the mass of Earth.
Your weight. You'd weigh about 1.5× your Earth weight standing here.
Temperature. Around 1377°C — hotter than a self-cleaning oven.

How we found it

Discovery. Found by Kepler using the transit method.

Properties

density gcc: 1.91
discovery facility: Kepler
discovery method: Transit
dist ly: 1591.3673
eccentricity: 0
eq temp k: 1650
insolation: 1245.431
mass earth: 24.472
name: Kepler-4 b
orbital period days: 3.2135
radius earth: 4.002
sys num planets: 1

About Kepler-4 b

Kepler-4 b is a rare exoplanet. It lies about 1,591.4 light-years from Earth, has an equilibrium temperature near 1,650 K, spans roughly 4 Earth radii and weighs about 24.47 Earth masses.

Its surface is likely an ocean of molten rock.

How to see it

Like any astronomical target, Kepler-4 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-4 b is a rare exoplanet

Kepler-4 b scores 44 points on Spacedle's rarity scale, which places it in the rare tier. Another 2 points would lift it into a rarer tier.

That score comes from 6 science badges — Confirmed exoplanet, Neptune-like, Lava world, Blasted by starlight, Found by Kepler and Distant (>1000 ly) — 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.