Confirmed exoplanet · Database record + computed analysis
HD 208487 b
A confirmed world orbiting HD 208487, 147.2 light-years away.
A gas giant
14.30 Earth radii, Jupiter-class (Jupiter is 11.2). At only 146.2 Earth masses for that size, it must be substantially gas or volatile ices: puffy, not rocky.
The orbit
Its year takes 129 Earth days (0.4 Earth years). The orbit is strongly stretched (eccentricity 0.37), 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 164 °C. Above water's boiling point. It receives 6.1 times the starlight Earth gets.
Its sun
Its star is hotter than the Sun (6,134 K, G2 V), burning brighter and faster.
How far is that, really?
At 147 light-years, tonight's light from this system left it around the year 1878. A Voyager-speed probe would need roughly 2,605,231 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 2004 from Anglo-Australian 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.