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Rare exoplanet 37 EP

LHS 1140 c

RA 11.2486° · Dec -15.2741° · exoplanet

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Score breakdown

· 5 badges
37 pts · Rare
Rare 50 pts → Epic
  • Tidally locked +10
  • Super-Earth +8
  • Orbits a red dwarf +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
Total score 37

13 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • Super-Earth · +8
  • Tidally locked · +10
  • Multi-planet system · +6
  • Orbits a red dwarf · +8

Trivia

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. Its density says rock, though lighter than Earth's mix: probably less iron, or a thick shell of water and ice over the top.
  • 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 14.2 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 October — that's when to go looking.

Could we get there?

  • Verdict. Hopelessly far for any craft humanity can build today.

Properties

density gcc
5.1
diameter km
16225.8864
discovery facility
Multiple Observatories
discovery method
Transit
discovery year
2018
dist ly
48.8781
eccentricity
0.05
eq temp k
422
host star teff
3096
inclination
89.8
insolation
5.3
mag
14.15
mass earth
1.91
name
LHS 1140 c
orbital period days
3.7779
radius earth
1.272
semi major au
0.027
spect
M4.5 V
sys num planets
2
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About LHS 1140 c

LHS 1140 c is a rare exoplanet. It lies about 48.9 light-years from Earth, shines at apparent magnitude 14.15, has spectral type M4.5 V and has an equilibrium temperature near 422 K.

It orbits closer to its star than Mercury does to the Sun, completing a lap in less time than Mercury takes.

How to see it

At apparent magnitude 14.15, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, LHS 1140 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 LHS 1140 c is a rare exoplanet

LHS 1140 c scores 37 points on Spacedle's rarity scale, which places it in the rare tier. Another 13 points would lift it into a rarer tier.

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