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Epic exoplanet 53 EP

GJ 3473 b

RA 120.5936° · Dec 3.3372° · exoplanet

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Score breakdown

· 7 badges
53 pts · Epic
Epic 78 pts → Anomaly
  • Two suns in its sky +12
  • Tidally locked +10
  • Super-Earth +8
  • Orbits a red dwarf +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Found by TESS +4
Total score 53

25 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Super-Earth · +8
  • Tidally locked · +10
  • Multi-planet system · +6
  • Found by TESS · +4
  • Orbits a red dwarf · +8
  • Two suns in its sky · +12

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 13.7 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 January — that's when to go looking.

Could we get there?

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

Properties

density gcc
5.03
diameter km
16123.8368
discovery facility
Transiting Exoplanet Survey Satellite (TESS)
discovery method
Transit
discovery year
2020
dist ly
89.2506
eccentricity
0
eq temp k
773
host star teff
3347
inclination
87.95
insolation
59.4
mag
13.74
mass earth
1.86
multi star system
yes
name
GJ 3473 b
orbital period days
1.198
radius earth
1.264
semi major au
0.0159
spect
M4
sys num planets
2
sys num stars
2
tidally locked
yes
tidally locked inferred
yes

About GJ 3473 b

GJ 3473 b is an epic exoplanet. It lies about 89.3 light-years from Earth, shines at apparent magnitude 13.74, has spectral type M4 and has an equilibrium temperature near 773 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 13.74, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, GJ 3473 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 3473 b is an epic exoplanet

GJ 3473 b scores 53 points on Spacedle's rarity scale, which places it in the epic tier. Another 25 points would lift it into a rarer tier.

That score comes from 7 science badges — Confirmed exoplanet, Super-Earth, Tidally locked, Multi-planet system, Found by TESS, Orbits a red dwarf 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.