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Epic exoplanet 57 EP

GJ 3323 b

RA 75.4869° · Dec -6.9485° · exoplanet

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Score breakdown

· 6 badges
57 pts · Epic
Epic 78 pts → Anomaly
  • Earth-sized +16
  • Nearby (<25 ly) +12
  • Tidally locked +10
  • Orbits a red dwarf +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
Total score 57

21 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Nearby (<25 ly) · +12
  • Earth-sized · +16
  • Tidally locked · +10
  • Multi-planet system · +6
  • Orbits a red dwarf · +8

Trivia

What makes it special

  • Earth-sized. Genuinely comparable to Earth in size. Worlds in this narrow band are the ones every next-generation telescope is being pointed at.

What it actually is

  • Hugging its star. It orbits closer to its star than Mercury does to the Sun, completing a lap in less time than Mercury takes.
  • What it is made of. Denser than Earth — a solid world of rock and iron, with no meaningful atmosphere to speak of by mass.
  • 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 12.6 it is far too faint for the eye: this one belongs to cameras and long exposures.
  • Seen from everywhere. It sits almost on the celestial equator, so it can be seen from essentially anywhere on Earth.
  • Best time of year. It stands highest in the middle of the night around December — that's when to go looking.

Properties

density gcc
5.96
diameter km
15690.126
discovery facility
La Silla Observatory
discovery method
Radial Velocity
discovery year
2017
dist ly
17.5304
eccentricity
0.23
eq temp k
290.06
host star teff
3159
insolation
2.58
mag
12.57
mass earth
2.02
name
GJ 3323 b
orbital period days
5.3636
radius earth
1.23
semi major au
0.0328
spect
M4
sys num planets
2
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About GJ 3323 b

GJ 3323 b is an epic exoplanet. It lies about 17.5 light-years from Earth, shines at apparent magnitude 12.57, has spectral type M4 and has an equilibrium temperature near 290 K.

Genuinely comparable to Earth in size. Worlds in this narrow band are the ones every next-generation telescope is being pointed at.

How to see it

At apparent magnitude 12.57, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, GJ 3323 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 3323 b is an epic exoplanet

GJ 3323 b 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 6 science badges — Confirmed exoplanet, Nearby (<25 ly), Earth-sized, Tidally locked, 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.