Confirmed exoplanet · Database record + computed analysis
Kepler-539 c
A confirmed world orbiting Kepler-539, 1,002.3 light-years away.
A gas giant
13.30 Earth radii, Jupiter-class (Jupiter is 11.2). At only 762.8 Earth masses for that size, it must be substantially gas or volatile ices: puffy, not rocky.
The orbit
Its year takes 1,000 Earth days (2.7 Earth years). The orbit is strongly stretched (eccentricity 0.50), 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 -20 °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 only 0.15 times Earth's starlight.
Its sun
Its star is Sun-like (5,820 K, G2 V; the Sun is 5,772 K). It shares the system with 1 other known planet.
How far is that, really?
At 1,002 light-years, tonight's light from this system left it around the year 1023. A Voyager-speed probe would need roughly 17,733,944 years to get there.
How we found it
It was found through transit timing variations: its gravity nudges a sibling planet's transits early and late, betraying its presence without ever being seen directly. The discovery was announced in 2016 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.