Confirmed exoplanet · Database record + computed analysis
HD 149026 b
A confirmed world orbiting HD 149026, 247.4 light-years away.
A gas giant
8.29 Earth radii, Jupiter-class (Jupiter is 11.2). At only 120.8 Earth masses for that size, it must be substantially gas or volatile ices: puffy, not rocky. Orbiting this close, it is a classic 'hot Jupiter', a giant that migrated inward from where it formed.
The orbit
Its year, one full orbit, takes just 2.9 Earth days.
Temperature and starlight
Its equilibrium temperature (the airless-world estimate) is about 1,353 °C. Hot enough to melt copper; any surface would glow. It receives 1,095.9 times the starlight Earth gets.
Its sun
Its star is hotter than the Sun (6,179 K, G0), burning brighter and faster.
How far is that, really?
At 247 light-years, tonight's light from this system left it around the year 1778. A Voyager-speed probe would need roughly 4,377,789 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 2005 from Subaru Telescope.
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.