About GJ 393 b
GJ 393 b is a rare exoplanet. It lies about 22.9 light-years from Earth, has an equilibrium temperature near 485 K, spans roughly 1.17 Earth radii and weighs about 1.71 Earth masses.
About 1.2× the width of Earth.
Rare exoplanet 33 EP
GJ 393 b
RA 157.2289° · Dec 0.8378° · exoplanet
Score breakdown
· 3 badgesRare 46 pts → Epic
- Earth-sized +16
- Nearby (<25 ly) +12
- Confirmed exoplanet +5
Total score 33
13 more points to reach Epic.
Badges
- Confirmed exoplanet · +5
- Earth-sized · +16
- Nearby (<25 ly) · +12
Trivia
Could we get there?
- Verdict. Hopelessly far for any craft humanity can build today.
Getting there
- Aboard Voyager 1. ≈ 403 thousand years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 35.8 thousand years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 229 years in a starship at a tenth of light speed.
- Distance. 22.9 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 2003.
Saying hello
- Say hello. A radio message and its reply would take 45.9 years round-trip.
Standing on it
- A year here. A full year lasts just 7 Earth days.
By the numbers
- Size. About 1.2× the width of Earth.
- Mass. About 1.7× the mass of Earth.
- Your weight. You'd weigh about 1.2× your Earth weight standing here.
- Temperature. A scorching 212°C on average.
How we found it
- Discovery. Found by Multiple Observatories using the radial velocity method.
Properties
- density gcc
- 5.87
- discovery facility
- Multiple Observatories
- discovery method
- Radial Velocity
- dist ly
- 22.9336
- eq temp k
- 485
- insolation
- 9.21
- mass earth
- 1.71
- name
- GJ 393 b
- orbital period days
- 7.0268
- radius earth
- 1.17
- sys num planets
- 1
How to see it
Like any astronomical target, GJ 393 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 393 b is a rare exoplanet
GJ 393 b scores 33 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 3 science badges — Confirmed exoplanet, Earth-sized and Nearby (<25 ly) — 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.