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Rare exoplanet 37 EP

GJ 806 b

RA 311.2697° · Dec 44.5002° · exoplanet

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Score breakdown

· 5 badges
37 pts · Rare
Rare 50 pts → Epic
  • Ultra-short period +14
  • Super-Earth +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Found by TESS +4
Total score 37

13 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • Super-Earth · +8
  • Ultra-short period · +14
  • Multi-planet system · +6
  • Found by TESS · +4

Trivia

Hard to believe

  • A year in a day. Its entire year is over in 22.2 hours. Birthdays here would come round faster than meals.

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 10.8 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 August — that's when to go looking.

Properties

density gcc
4.4
diameter km
16978.5022
discovery facility
Transiting Exoplanet Survey Satellite (TESS)
discovery method
Transit
discovery year
2023
dist ly
39.2839
eq temp k
940
host star teff
3600
inclination
87.7
insolation
130
mag
10.79
mass earth
1.9
name
GJ 806 b
orbital period days
0.9263
radius earth
1.331
semi major au
0.0141
spect
M1.5 V
sys num planets
2
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About GJ 806 b

GJ 806 b is a rare exoplanet. It lies about 39.3 light-years from Earth, shines at apparent magnitude 10.79, has spectral type M1.5 V and has an equilibrium temperature near 940 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 10.79, a small backyard telescope will bring it into view.

Like any astronomical target, GJ 806 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 806 b is a rare exoplanet

GJ 806 b 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, Ultra-short period, Multi-planet system and Found by TESS — 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.