← Back to dex
Rare exoplanet 38 EP

GJ 3021 b

RA 4.0634° · Dec -79.8514° · exoplanet

Loading sky survey…
🌌 View in 3D star map
Tonight’s visibility

Computing the sky for your location…

Score breakdown

· 5 badges
38 pts · Rare
Rare 50 pts → Epic
  • Two suns in its sky +12
  • Eccentric orbit +9
  • Orbits a Sun-like star +8
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 38

12 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Eccentric orbit · +9
  • Orbits a Sun-like star · +8
  • Two suns in its sky · +12

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.

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 6.6 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • Southern sky only. So far south it never rises for most of the northern hemisphere. To see it you'd have to travel to Chile, South Africa or Australia.
  • Best time of year. It stands highest in the middle of the night around September — 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. ≈ 1 million years at Voyager 1's speed (17 km/s).
  • Fastest probe ever. ≈ 89.4 thousand years even at the Parker Solar Probe's 192 km/s.

Properties

density gcc
2.62
diameter km
167106.22
discovery facility
La Silla Observatory
discovery method
Radial Velocity
discovery year
2000
dist ly
57.2596
eccentricity
0.511
eq temp k
350
host star teff
5540
insolation
2.7517
mag
6.59
mass earth
1071.04
multi star system
yes
name
GJ 3021 b
orbital period days
133.71
radius earth
13.1
semi major au
0.49
spect
G6 V
sys num planets
1
sys num stars
2

About GJ 3021 b

GJ 3021 b is a rare exoplanet. It lies about 57.3 light-years from Earth, shines at apparent magnitude 6.59, has spectral type G6 V and has an equilibrium temperature near 350 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 6.59, it is an easy target for binoculars.

Like any astronomical target, GJ 3021 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 3021 b is a rare exoplanet

GJ 3021 b scores 38 points on Spacedle's rarity scale, which places it in the rare tier. Another 12 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Gas giant, Eccentric orbit, Orbits a Sun-like star 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.