About Gliese 12 b
Gliese 12 b is an uncommon exoplanet. It lies about 39.8 light-years from Earth, has an equilibrium temperature near 315 K, spans roughly 0.93 Earth radii and weighs about 0.95 Earth masses.
Around 93% of Earth's width.
Uncommon exoplanet 25 EP
Gliese 12 b
RA 3.9579° · Dec 13.5576° · exoplanet
Score breakdown
· 3 badgesUncommon 33 pts → Rare
- Earth-sized +16
- Confirmed exoplanet +5
- Found by TESS +4
Total score 25
8 more points to reach Rare.
Badges
- Confirmed exoplanet · +5
- Earth-sized · +16
- Found by TESS · +4
Trivia
Could we get there?
- Verdict. Hopelessly far for any craft humanity can build today.
Getting there
- Aboard Voyager 1. ≈ 699.8 thousand years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 62.2 thousand years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 398 years in a starship at a tenth of light speed.
- Distance. 39.8 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 1986.
Saying hello
- Say hello. A radio message and its reply would take 79.6 years round-trip.
Standing on it
- A year here. A full year lasts just 12.8 Earth days.
By the numbers
- Size. Around 93% of Earth's width.
- Mass. About 0.9× the mass of Earth.
- Your weight. You'd weigh about 1.1× your Earth weight standing here.
- Temperature. A surprisingly temperate 41°C average.
How we found it
- Discovery. Found by Transiting Exoplanet Survey Satellite (TESS) using the transit method.
Properties
- density gcc
- 6.4
- discovery facility
- Transiting Exoplanet Survey Satellite (TESS)
- discovery method
- Transit
- dist ly
- 39.8236
- eccentricity
- 0.24
- eq temp k
- 314.6
- insolation
- 1.62
- mass earth
- 0.95
- name
- Gliese 12 b
- orbital period days
- 12.7614
- radius earth
- 0.93
- sys num planets
- 1
How to see it
Like any astronomical target, Gliese 12 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 Gliese 12 b is an uncommon exoplanet
Gliese 12 b scores 25 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 8 points would lift it into a rarer tier.
That score comes from 3 science badges — Confirmed exoplanet, Earth-sized 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.