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Epic exoplanet 57 EP

GJ 15 A c

RA 4.6127° · Dec 44.0247° · exoplanet

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Score breakdown

· 7 badges
57 pts · Epic
Epic 78 pts → Anomaly
  • Nearby (<25 ly) +12
  • Two suns in its sky +12
  • Long-period world +10
  • Frozen world +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 57

21 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Nearby (<25 ly) · +12
  • Gas giant · +4
  • Frozen world · +8
  • Long-period world · +10
  • Multi-planet system · +6
  • Two suns in its sky · +12

Trivia

What makes it special

  • Frozen world. A deep-frozen world, too far from its star's warmth for anything to stay liquid.

Hard to believe

  • It would float. It is less dense than water. Drop it in a big enough ocean and the whole world would bob on the surface.

What it actually is

  • What it is made of. Lighter than Neptune — a puffed-up ball of hydrogen and helium with no surface anywhere on it to stand on.
  • 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 8.1 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • Northern sky. It rides the northern half of the sky — an easier target the further north you are.
  • Best time of year. It stands highest in the middle of the night around September — that's when to go looking.

Properties

density gcc
0.667
diameter km
85083.854
discovery facility
Roque de los Muchachos Observatory
discovery method
Radial Velocity
discovery year
2018
dist ly
11.6186
eccentricity
0.27
eq temp k
46.14
host star teff
3607
insolation
0.0008
mag
8.09
mass earth
36
multi star system
yes
name
GJ 15 A c
orbital period days
7600
radius earth
6.67
semi major au
5.4
spect
M1
sys num planets
2
sys num stars
2

Nearby objects

About GJ 15 A c

GJ 15 A c is an epic exoplanet. It lies about 11.6 light-years from Earth, shines at apparent magnitude 8.09, has spectral type M1 and has an equilibrium temperature near 46 K.

A deep-frozen world, too far from its star's warmth for anything to stay liquid.

How to see it

At apparent magnitude 8.09, it is an easy target for binoculars.

Like any astronomical target, GJ 15 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 15 A c is an epic exoplanet

GJ 15 A c scores 57 points on Spacedle's rarity scale, which places it in the epic tier. Another 21 points would lift it into a rarer tier.

That score comes from 7 science badges — Confirmed exoplanet, Nearby (<25 ly), Gas giant, Frozen world, Long-period world, Multi-planet system and Two suns in its sky — 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.