Uncommon exoplanet 28 EP

GJ 229 A c

RA 92.6436° · Dec -21.8677° · exoplanet

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Score breakdown

· 4 badges

28 pts · Uncommon

Uncommon 33 pts → Rare

Nearby (<25 ly) +12
Multi-planet system +6
Confirmed exoplanet +5
Sub-Neptune +5

Total score 28

5 more points to reach Rare.

Badges

Confirmed exoplanet · +5
Sub-Neptune · +5
Multi-planet system · +6
Nearby (<25 ly) · +12

Trivia

Could we get there?

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

Getting there

Aboard Voyager 1. ≈ 329.9 thousand years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 29.3 thousand years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 188 years in a starship at a tenth of light speed.
Distance. 18.8 light-years from Earth.

Look-back time

Look-back time. The light you'd see left around the year 2007.

Saying hello

Say hello. A radio message and its reply would take 37.5 years round-trip.

Standing on it

A year here. A full year lasts just 122 Earth days.

By the numbers

Size. About 2.9× the width of Earth.
Volume. About 23.6 Earths could fit inside it.
Mass. About 8.6× the mass of Earth.
Your weight. You'd weigh about 1.0× your Earth weight standing here.
Temperature. A frigid -85°C — colder than dry ice.

How we found it

Discovery. Found by Multiple Facilities using the radial velocity method.

Cosmic context

Crowded system. One of at least 2 planets orbiting its star.

Properties

density gcc: 1.99
discovery facility: Multiple Facilities
discovery method: Radial Velocity
dist ly: 18.7743
eccentricity: 0.366
eq temp k: 188.1
insolation: 0.1899
mass earth: 8.5814
name: GJ 229 A c
orbital period days: 121.9327
radius earth: 2.87
sys num planets: 2

About GJ 229 A c

GJ 229 A c is an uncommon exoplanet. It lies about 18.8 light-years from Earth, has an equilibrium temperature near 188 K, spans roughly 2.87 Earth radii and weighs about 8.58 Earth masses.

One of at least 2 planets orbiting its star.

How to see it

Like any astronomical target, GJ 229 A c 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 GJ 229 A c is an uncommon exoplanet

GJ 229 A c scores 28 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 5 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Sub-Neptune, Multi-planet system and Nearby (<25 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.