Confirmed exoplanet · Database record + computed analysis
HD 222237 b
A confirmed world orbiting HD 222237, 37.3 light-years away.
A gas giant
12.80 Earth radii, Jupiter-class (Jupiter is 11.2).
The orbit
Its year takes 14,892 Earth days (40.8 Earth years). The orbit is strongly stretched (eccentricity 0.56), so its distance from the star, and with it the climate, swings dramatically.
Temperature and starlight
Its equilibrium temperature (the airless-world estimate) is about -214 °C. Deep-freeze territory, colder than Antarctica's worst. It receives only 0.00 times Earth's starlight.
Its sun
Its star is an orange K-type (4,751 K), K3 V: cooler and longer-lived than the Sun, a class some astronomers consider ideal for habitability.
How far is that, really?
At 37 light-years, tonight's light from this system left it around the year 1988. That is close by galactic standards, which makes it a prime target for follow-up telescopes. A Voyager-speed probe would need roughly 660,549 years to get there.
How we found it
It was found by the radial-velocity method: the planet's gravity swings its star in a small circle, and that wobble shows up as a rhythmic Doppler shift in the starlight. The wobble's size gives the planet's minimum mass. The discovery was announced in 2024 from Multiple Observatories.
Everything above is computed from the archive’s measured values for this planet. Where a quantity is missing, the statement is omitted rather than guessed.
About this record
The measured values come from the NASA Exoplanet Archive, and any missing value has not been determined yet; the Atlas never fills gaps with guesses. More standout worlds: Proxima b, TRAPPIST-1e, K2-18 b, 55 Cancri e, and the detection methods that found them all.