Confirmed exoplanet · Database record + computed analysis
KOI-1257 b
A confirmed world orbiting KOI-1257, 2,139.6 light-years away.
A gas giant
10.54 Earth radii, Jupiter-class (Jupiter is 11.2).
The orbit
Its year, one full orbit, takes just 86.6 Earth days. The orbit is strongly stretched (eccentricity 0.77), 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 238 °C. Above water's boiling point. It receives 7.3 times the starlight Earth gets.
Its sun
Its star is Sun-like (5,520 K, G5 V; the Sun is 5,772 K). The system holds 2 stars, so its skies have more than one sun.
How far is that, really?
At 2,140 light-years, tonight's light from this system left it around the year -113. A Voyager-speed probe would need roughly 37,854,820 years to get there.
How we found it
It was found by the transit method: the planet crosses its star's face on schedule, dimming it by a tiny, repeating fraction. The dip's depth gives the planet's size. The discovery was announced in 2014 from Kepler.
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.