Rare exoplanet 44 EP

Kepler-381 b

RA 285.1829° · Dec 43.8310° · exoplanet

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Score breakdown

· 5 badges

44 pts · Rare

Rare 46 pts → Epic

Earth-sized +16
Lava world +14
Multi-planet system +6
Confirmed exoplanet +5
Found by Kepler +3

Total score 44

2 more points to reach Epic.

Badges

Confirmed exoplanet · +5
Earth-sized · +16
Lava world · +14
Multi-planet system · +6
Found by Kepler · +3

Trivia

What makes it special

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

Could we get there?

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

Getting there

Aboard Voyager 1. ≈ 15.3 million years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 1.4 million years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 8719 years in a starship at a tenth of light speed.
Distance. 872 light-years from Earth.

Look-back time

Look-back time. The light you'd see left around the year 1154.

Saying hello

Say hello. A radio message and its reply would take 1744 years round-trip.

Standing on it

A year here. A full year lasts just 5.6 Earth days.

By the numbers

Size. Almost exactly Earth-sized.
Mass. About 0.9× the mass of Earth.
Your weight. You'd weigh about 1.0× your Earth weight standing here.
Temperature. Around 1303°C — hotter than a self-cleaning oven.

How we found it

Discovery. Found by Kepler using the transit method.

Cosmic context

Crowded system. One of at least 3 planets orbiting its star.

Properties

density gcc: 5.31
discovery facility: Kepler
discovery method: Transit
dist ly: 871.89
eccentricity: 0
eq temp k: 1576
insolation: 716.085
mass earth: 0.937
name: Kepler-381 b
orbital period days: 5.629
radius earth: 0.99
sys num planets: 3

About Kepler-381 b

Kepler-381 b is a rare exoplanet. It lies about 871.9 light-years from Earth, has an equilibrium temperature near 1,576 K, spans roughly 0.99 Earth radii and weighs about 0.94 Earth masses.

Its surface is likely an ocean of molten rock.

How to see it

Like any astronomical target, Kepler-381 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-381 b is a rare exoplanet

Kepler-381 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 5 science badges — Confirmed exoplanet, Earth-sized, Lava 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.