Confirmed exoplanet · Database record + computed analysis
HD 13908 c
A confirmed world orbiting HD 13908, 259.5 light-years away.
A gas giant
12.80 Earth radii, Jupiter-class (Jupiter is 11.2).
The orbit
Its year takes 931 Earth days (2.5 Earth years).
Temperature and starlight
Its equilibrium temperature (the airless-world estimate) is about 0 °C. In the range where, with the right atmosphere, liquid water is conceivable; a real atmosphere could shift the true surface figure a lot (Earth's equilibrium value is −18 °C, yet we average +15 °C). It receives 0.97 times Earth's starlight, the same order as our own world.
Its sun
Its star is hotter than the Sun (6,255 K, F8 V), burning brighter and faster. It shares the system with 1 other known planet.
How far is that, really?
At 259 light-years, tonight's light from this system left it around the year 1766. A Voyager-speed probe would need roughly 4,590,560 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 2013 from Haute-Provence 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.