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Uncommon exoplanet 23 EP

GJ 740 b

RA 284.4997° · Dec 5.9029° · exoplanet

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Score breakdown

· 3 badges
23 pts · Uncommon
Uncommon 34 pts → Rare
  • Tidally locked +10
  • Super-Earth +8
  • Confirmed exoplanet +5
Total score 23

11 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Super-Earth · +8
  • Tidally locked · +10

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.

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 9.2 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 July — that's when to go looking.

Could we get there?

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

Getting there

  • Aboard Voyager 1. ≈ 636.3 thousand years at Voyager 1's speed (17 km/s).

Properties

density gcc
4.54
diameter km
19516.986
discovery facility
Multiple Observatories
discovery method
Radial Velocity
discovery year
2021
dist ly
36.2089
eccentricity
0.24
eq temp k
829
host star teff
3913
insolation
79
mag
9.22
mass earth
2.96
name
GJ 740 b
orbital period days
2.3776
radius earth
1.53
semi major au
0.029
spect
M1.0 V
sys num planets
1
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About GJ 740 b

GJ 740 b is an uncommon exoplanet. It lies about 36.2 light-years from Earth, shines at apparent magnitude 9.22, has spectral type M1.0 V and has an equilibrium temperature near 829 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 9.22, a small backyard telescope will bring it into view.

Like any astronomical target, GJ 740 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 740 b is an uncommon exoplanet

GJ 740 b scores 23 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 11 points would lift it into a rarer tier.

That score comes from 3 science badges — Confirmed exoplanet, Super-Earth and Tidally locked — 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.