Confirmed exoplanet · Database record + computed analysis
BD+42 2315 b
A confirmed world orbiting BD+42 2315, 1,991.9 light-years away.
A gas giant
14.20 Earth radii, Jupiter-class (Jupiter is 11.2). At only 174.8 Earth masses for that size, it must be substantially gas or volatile ices: puffy, not rocky.
The orbit
Its year takes 123 Earth days (0.3 Earth years). The orbit is strongly stretched (eccentricity 0.73), 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 974 °C. Hot enough to melt copper; any surface would glow. It receives 335.1 times the starlight Earth gets.
Its sun
Its star is an orange K-type (4,500 K): cooler and longer-lived than the Sun, a class some astronomers consider ideal for habitability.
How far is that, really?
At 1,992 light-years, tonight's light from this system left it around the year 34. A Voyager-speed probe would need roughly 35,241,625 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 2023 from McDonald Observatory.
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.