← Back to dex
Common exoplanet 20 EP

Gl 378 b

RA 150.5866° · Dec 48.0825° · exoplanet

Loading sky survey…
🌌 View in 3D star map
Tonight’s visibility

Computing the sky for your location…

Score breakdown

· 3 badges
20 pts · Common
Common 22 pts → Uncommon
  • Tidally locked +10
  • Confirmed exoplanet +5
  • Sub-Neptune +5
Total score 20

2 more points to reach Uncommon.

Badges

  • Confirmed exoplanet · +5
  • Sub-Neptune · +5
  • 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. Lighter than Neptune — a puffed-up ball of hydrogen and helium with no surface anywhere on it to stand on.

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 10 you'll want a small backyard telescope.
  • Northern sky. It rides the northern half of the sky — an easier target the further north you are.
  • Best time of year. It stands highest in the middle of the night around February — 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. ≈ 857.1 thousand years at Voyager 1's speed (17 km/s).

Properties

density gcc
1.46
diameter km
46687.692
discovery facility
Haute-Provence Observatory
discovery method
Radial Velocity
discovery year
2019
dist ly
48.775
eccentricity
0.109
eq temp k
830
host star teff
3879
insolation
38.5823
mag
10.03
mass earth
13.02
name
Gl 378 b
orbital period days
3.822
radius earth
3.66
semi major au
0.0394
spect
M1
sys num planets
1
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About Gl 378 b

Gl 378 b is a common exoplanet. It lies about 48.8 light-years from Earth, shines at apparent magnitude 10.03, has spectral type M1 and has an equilibrium temperature near 830 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 10.03, a small backyard telescope will bring it into view.

Like any astronomical target, Gl 378 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 Gl 378 b is a common exoplanet

Gl 378 b scores 20 points on Spacedle's rarity scale, which places it in the common tier. Another 2 points would lift it into a rarer tier.

That score comes from 3 science badges — Confirmed exoplanet, Sub-Neptune 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.