Confirmed exoplanet · Database record + computed analysis
HD 102329 b
A confirmed world orbiting HD 102329, 708.1 light-years away.
A gas giant
12.60 Earth radii, Jupiter-class (Jupiter is 11.2). With 2593.5 Earth masses packed into that size, its density points to rock and iron rather than gas.
The orbit
Its year takes 778 Earth days (2.1 Earth years).
Temperature and starlight
Its equilibrium temperature (the airless-world estimate) is about 260 °C. Above water's boiling point. It receives 6.0 times the starlight Earth gets.
Its sun
Its star is an orange K-type (4,745 K), K0 III: cooler and longer-lived than the Sun, a class some astronomers consider ideal for habitability. It shares the system with 1 other known planet.
How far is that, really?
At 708 light-years, tonight's light from this system left it around the year 1317. A Voyager-speed probe would need roughly 12,528,272 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 2011 from W. M. Keck 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.