Confirmed exoplanet · Database record + computed analysis
CI Tau c
A confirmed world orbiting CI Tau, 515.3 light-years away.
A gas giant
13.00 Earth radii, Jupiter-class (Jupiter is 11.2).
The orbit
Its year, one full orbit, takes just 25.2 Earth days. The orbit is strongly stretched (eccentricity 0.58), 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 337 °C. Above water's boiling point. It receives 19.3 times the starlight Earth gets.
Its sun
Its star is a red dwarf (3,807 K surface), type K7: small, dim, flare-prone, and destined to outlive the Sun many times over.
How far is that, really?
At 515 light-years, tonight's light from this system left it around the year 1510. A Voyager-speed probe would need roughly 9,117,356 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 2024 from Multiple Observatories.
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.