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Rare exoplanet 45 EP

GJ 1132 b

RA 153.7091° · Dec -47.1549° · exoplanet

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Score breakdown

· 5 badges
45 pts · Rare
Rare 50 pts → Epic
  • Earth-sized +16
  • Tidally locked +10
  • Orbits a red dwarf +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
Total score 45

5 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • 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 13.7 it is far too faint for the eye: this one belongs to cameras and long exposures.
  • 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 February — that's when to go looking.

Properties

density gcc
5.97
diameter km
15199.1992
discovery facility
Cerro Tololo Inter-American Observatory
discovery method
Transit
discovery year
2015
dist ly
41.1381
eccentricity
0.0118
eq temp k
583.8
host star teff
3229
inclination
88.16
insolation
19.3
mag
13.68
mass earth
1.837
name
GJ 1132 b
orbital period days
1.6289
radius earth
1.1915
semi major au
0.0157
spect
M4.5 V
sys num planets
2
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About GJ 1132 b

GJ 1132 b is a rare exoplanet. It lies about 41.1 light-years from Earth, shines at apparent magnitude 13.68, has spectral type M4.5 V and has an equilibrium temperature near 584 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 13.68, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, GJ 1132 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 1132 b is a rare exoplanet

GJ 1132 b scores 45 points on Spacedle's rarity scale, which places it in the rare tier. Another 5 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, 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.