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Rare exoplanet 43 EP

GJ 3512 b

RA 130.3317° · Dec 59.4918° · exoplanet

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Score breakdown

· 6 badges
43 pts · Rare
Rare 50 pts → Epic
  • Puffy low-density world +12
  • Frozen world +8
  • Orbits a red dwarf +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 43

7 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Frozen world · +8
  • Puffy low-density world · +12
  • Multi-planet system · +6
  • Orbits a red dwarf · +8

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 15.2 it is far too faint for the eye: this one belongs to cameras and long exposures.
  • 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 January — that's when to go looking.

Properties

density gcc
0.275
diameter km
182413.66
discovery facility
Calar Alto Observatory
discovery method
Radial Velocity
discovery year
2019
dist ly
30.9404
eccentricity
0.4279
eq temp k
97.19
host star teff
3141
insolation
0.0138
mag
15.18
mass earth
146.5189
name
GJ 3512 b
orbital period days
203.109
radius earth
14.3
semi major au
0.3376
spect
M5.5 V
sys num planets
2
sys num stars
1

About GJ 3512 b

GJ 3512 b is a rare exoplanet. It lies about 30.9 light-years from Earth, shines at apparent magnitude 15.18, has spectral type M5.5 V and has an equilibrium temperature near 97 K.

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

How to see it

At apparent magnitude 15.18, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, GJ 3512 b 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 3512 b is a rare exoplanet

GJ 3512 b scores 43 points on Spacedle's rarity scale, which places it in the rare tier. Another 7 points would lift it into a rarer tier.

That score comes from 6 science badges — Confirmed exoplanet, Gas giant, Frozen world, Puffy low-density world, Multi-planet system and Orbits a red dwarf — 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.