Epic exoplanet 54 EP

Kepler-438 b

RA 281.6457° · Dec 41.9511° · exoplanet

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Score breakdown

· 4 badges

54 pts · Epic

Epic 68 pts → Anomaly

In the habitable zone +30
Earth-sized +16
Confirmed exoplanet +5
Found by Kepler +3

Total score 54

14 more points to reach Anomaly.

Badges

Confirmed exoplanet · +5
In the habitable zone · +30
Earth-sized · +16
Found by Kepler · +3

Trivia

What makes it special

Goldilocks zone. Sits where it's neither too hot nor too cold — liquid water could exist.

Could we get there?

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

Getting there

Aboard Voyager 1. ≈ 11.2 million years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 997.9 thousand years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 6391 years in a starship at a tenth of light speed.
Distance. 639 light-years from Earth.

Look-back time

Look-back time. The light you'd see left around the year 1387.

Saying hello

Say hello. A radio message and its reply would take 1278 years round-trip.

Standing on it

A year here. A full year lasts just 35.2 Earth days.

By the numbers

Size. About 1.1× the width of Earth.
Mass. About 1.5× the mass of Earth.
Your weight. You'd weigh about 1.2× your Earth weight standing here.
Temperature. A surprisingly temperate 15°C average.

How we found it

Discovery. Found by Kepler using the transit method.

Properties

density gcc: 5.71
discovery facility: Kepler
discovery method: Transit
dist ly: 639.0794
eccentricity: 0.03
eq temp k: 288
habitable zone: yes
insolation: 1.4
mass earth: 1.46
name: Kepler-438 b
orbital period days: 35.2332
radius earth: 1.12
sys num planets: 1

About Kepler-438 b

Kepler-438 b is an epic exoplanet. It lies about 639.1 light-years from Earth, has an equilibrium temperature near 288 K, spans roughly 1.12 Earth radii and weighs about 1.46 Earth masses.

Sits where it's neither too hot nor too cold — liquid water could exist.

How to see it

Like any astronomical target, Kepler-438 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-438 b is an epic exoplanet

Kepler-438 b scores 54 points on Spacedle's rarity scale, which places it in the epic tier. Another 14 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, In the habitable zone, Earth-sized 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.