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Epic exoplanet 50 EP

GJ 229 A c

RA 92.6436° · Dec -21.8677° · exoplanet

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Score breakdown

· 6 badges
50 pts · Epic
Epic 78 pts → Anomaly
  • Nearby (<25 ly) +12
  • Two suns in its sky +12
  • Disputed — it may not be there at all +10
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Sub-Neptune +5
Total score 50

28 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Nearby (<25 ly) · +12
  • Sub-Neptune · +5
  • Multi-planet system · +6
  • Two suns in its sky · +12
  • Disputed — it may not be there at all · +10

Trivia

What it actually is

  • What it is made of. Too light to be solid rock and too heavy to be all gas: most likely a deep global ocean or a thick steamy envelope over a rocky core.
  • Crowded system. One of at least 2 planets orbiting its star.

Sense of scale

  • In perspective. Inside our stellar backyard: every radio broadcast humanity has ever made has already swept past it.

Find it in the sky

  • How to spot it. At magnitude 8.2 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • Southern sky. It rides the southern half of the sky — an easier target the further south you are.
  • Best time of year. It stands highest in the middle of the night around December — that's when to go looking.

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).

Properties

controversial
yes
density gcc
1.99
diameter km
36610.294
discovery facility
Multiple Facilities
discovery method
Radial Velocity
discovery year
2020
dist ly
18.7743
eccentricity
0.366
eq temp k
188.1
host star teff
3564
insolation
0.1899
mag
8.15
mass earth
8.5814
multi star system
yes
name
GJ 229 A c
orbital period days
121.9327
radius earth
2.87
semi major au
0.384
spect
M1.5V
sys num planets
2
sys num stars
3

About GJ 229 A c

GJ 229 A c is an epic exoplanet. It lies about 18.8 light-years from Earth, shines at apparent magnitude 8.15, has spectral type M1.5V and has an equilibrium temperature near 188 K.

Too light to be solid rock and too heavy to be all gas: most likely a deep global ocean or a thick steamy envelope over a rocky core.

How to see it

At apparent magnitude 8.15, it is an easy target for binoculars.

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 epic exoplanet

GJ 229 A c scores 50 points on Spacedle's rarity scale, which places it in the epic tier. Another 28 points would lift it into a rarer tier.

That score comes from 6 science badges — Confirmed exoplanet, Nearby (<25 ly), Sub-Neptune, Multi-planet system, Two suns in its sky and Disputed — it may not be there at all — 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.