Epic exoplanet 55 EP

TRAPPIST-1 d

RA 346.6264° · Dec -5.0435° · exoplanet

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Score breakdown

· 4 badges

55 pts · Epic

Epic 68 pts → Anomaly

In the habitable zone +30
Richly packed system +14
Multi-planet system +6
Confirmed exoplanet +5

Total score 55

13 more points to reach Anomaly.

Badges

Confirmed exoplanet · +5
In the habitable zone · +30
Multi-planet system · +6
Richly packed system · +14

Trivia

What makes it special

Goldilocks zone. Sits where it's neither too hot nor too cold — liquid water could exist.
Packed system. Crammed into a system of five or more planets.

Could we get there?

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

Getting there

Aboard Voyager 1. ≈ 712.4 thousand years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 63.3 thousand years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 405 years in a starship at a tenth of light speed.
Distance. 40.5 light-years from Earth.

Look-back time

Look-back time. The light you'd see left around the year 1985.

Saying hello

Say hello. A radio message and its reply would take 81.1 years round-trip.

Standing on it

A year here. A full year lasts just 4 Earth days.

By the numbers

Size. Around 79% of Earth's width.
Mass. About 0.4× the mass of Earth.
Your weight. You'd weigh about 0.6× your Earth weight standing here.
Temperature. A surprisingly temperate 13°C average.

How we found it

Discovery. Found by La Silla Observatory using the transit method.

Cosmic context

Crowded system. One of at least 7 planets orbiting its star.

Properties

density gcc: 4.3668
discovery facility: La Silla Observatory
discovery method: Transit
dist ly: 40.5408
eccentricity: 0.0084
eq temp k: 286.2
habitable zone: yes
insolation: 1.115
mass earth: 0.388
name: TRAPPIST-1 d
orbital period days: 4.0492
radius earth: 0.788
sys num planets: 7

About TRAPPIST-1 d

TRAPPIST-1 d is an epic exoplanet. It lies about 40.5 light-years from Earth, has an equilibrium temperature near 286 K, spans roughly 0.79 Earth radii and weighs about 0.39 Earth masses.

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

How to see it

Like any astronomical target, TRAPPIST-1 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 TRAPPIST-1 d is an epic exoplanet

TRAPPIST-1 d scores 55 points on Spacedle's rarity scale, which places it in the epic tier. Another 13 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, In the habitable zone, Multi-planet system and Richly packed system — 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.