Confirmed exoplanet · Database record + computed analysis
HD 41004 A b
A confirmed world orbiting HD 41004 A, 119.7 light-years away.
A gas giant
13.20 Earth radii, Jupiter-class (Jupiter is 11.2).
The orbit
Its year takes 963 Earth days (2.6 Earth years). The orbit is strongly stretched (eccentricity 0.74), so its distance from the star, and with it the climate, swings dramatically.
Its sun
Its star is Sun-like (5,310 K, K1/K2 V; the Sun is 5,772 K). The system holds 2 stars, so its skies have more than one sun. It shares the system with 1 other known planet.
How far is that, really?
At 120 light-years, tonight's light from this system left it around the year 1906. A Voyager-speed probe would need roughly 2,117,283 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 La Silla 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.