Uncommon exoplanet 25 EP

TRAPPIST-1 h

RA 346.6264° · Dec -5.0435° · exoplanet

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Score breakdown

· 3 badges

25 pts · Uncommon

Uncommon 33 pts → Rare

Richly packed system +14
Multi-planet system +6
Confirmed exoplanet +5

Total score 25

8 more points to reach Rare.

Badges

Confirmed exoplanet · +5
Multi-planet system · +6
Richly packed system · +14

Trivia

What makes it special

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 18.8 Earth days.

By the numbers

Size. Around 76% of Earth's width.
Mass. About 0.3× the mass of Earth.
Your weight. You'd weigh about 0.6× your Earth weight standing here.
Temperature. A frigid -101°C — colder than dry ice.

How we found it

Discovery. Found by Multiple Observatories using the transit method.

Cosmic context

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

Properties

density gcc: 4.1628
discovery facility: Multiple Observatories
discovery method: Transit
dist ly: 40.5408
eccentricity: 0.0057
eq temp k: 171.7
insolation: 0.144
mass earth: 0.326
name: TRAPPIST-1 h
orbital period days: 18.7729
radius earth: 0.755
sys num planets: 7

About TRAPPIST-1 h

TRAPPIST-1 h is an uncommon exoplanet. It lies about 40.5 light-years from Earth, has an equilibrium temperature near 172 K, spans roughly 0.76 Earth radii and weighs about 0.33 Earth masses.

Crammed into a system of five or more planets.

How to see it

Like any astronomical target, TRAPPIST-1 h 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 h is an uncommon exoplanet

TRAPPIST-1 h scores 25 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 8 points would lift it into a rarer tier.

That score comes from 3 science badges — Confirmed exoplanet, 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.