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Epic exoplanet 57 EP

GJ 273 c

RA 111.8521° · Dec 5.2258° · 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. 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 9.8 you'll want a small backyard telescope.
  • 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 January — that's when to go looking.

Properties

density gcc
5.44
diameter km
13521.572
discovery facility
La Silla Observatory
discovery method
Radial Velocity
discovery year
2017
dist ly
19.3134
eccentricity
0.17
eq temp k
462.26
host star teff
3382
insolation
6.66
mag
9.84
mass earth
1.18
name
GJ 273 c
orbital period days
4.7234
radius earth
1.06
semi major au
0.0365
spect
M3.5
sys num planets
2
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About GJ 273 c

GJ 273 c is an epic exoplanet. It lies about 19.3 light-years from Earth, shines at apparent magnitude 9.84, has spectral type M3.5 and has an equilibrium temperature near 462 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 9.84, a small backyard telescope will bring it into view.

Like any astronomical target, GJ 273 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 GJ 273 c is an epic exoplanet

GJ 273 c 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.