About K2-22 b
K2-22 b is a rare exoplanet. It lies about 795.3 light-years from Earth, has an equilibrium temperature near 2,100 K, spans roughly 2.3 Earth radii and weighs about 444.96 Earth masses.
Its surface is likely an ocean of molten rock.
Rare exoplanet 38 EP
K2-22 b
RA 169.4827° · Dec 2.6190° · exoplanet
Score breakdown
· 4 badgesRare 46 pts → Epic
- Lava world +14
- Ultra-short period +14
- Confirmed exoplanet +5
- Sub-Neptune +5
Total score 38
8 more points to reach Epic.
Badges
- Confirmed exoplanet · +5
- Sub-Neptune · +5
- Lava world · +14
- Ultra-short period · +14
Trivia
What makes it special
- Lava world. Its surface is likely an ocean of molten rock.
Could we get there?
- Verdict. Hopelessly far for any craft humanity can build today.
Getting there
- Aboard Voyager 1. ≈ 14 million years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 1.2 million years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 7953 years in a starship at a tenth of light speed.
- Distance. 795 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 1231.
Saying hello
- Say hello. A radio message and its reply would take 1591 years round-trip.
Standing on it
- A year here. A full year lasts just 0.4 Earth days.
By the numbers
- Size. About 2.3× the width of Earth.
- Volume. About 12.2 Earths could fit inside it.
- Mass. Roughly 445× Earth's mass — about 1.4 Jupiters.
- Your weight. You'd weigh about 84.1× your Earth weight standing here.
- Temperature. Around 2100 K — hot enough to vaporise iron.
How we found it
- Discovery. Found by K2 using the transit method.
Properties
- discovery facility
- K2
- discovery method
- Transit
- dist ly
- 795.2857
- eccentricity
- 0.19
- eq temp k
- 2100
- insolation
- 114
- mass earth
- 444.962
- name
- K2-22 b
- orbital period days
- 0.3811
- radius earth
- 2.3
- sys num planets
- 1
How to see it
Like any astronomical target, K2-22 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 K2-22 b is a rare exoplanet
K2-22 b scores 38 points on Spacedle's rarity scale, which places it in the rare tier. Another 8 points would lift it into a rarer tier.
That score comes from 4 science badges — Confirmed exoplanet, Sub-Neptune, Lava world and Ultra-short period — 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.