Confirmed exoplanet · Database record + computed analysis
Kepler-448 c
A confirmed world orbiting KOI-12, 1,302.7 light-years away.
A gas giant
12.00 Earth radii, Jupiter-class (Jupiter is 11.2). With 6992.3 Earth masses packed into that size, its density points to rock and iron rather than gas.
The orbit
Its year takes 2,500 Earth days (6.8 Earth years). The orbit is strongly stretched (eccentricity 0.65), 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 -88 °C. It receives 0.24 times Earth's starlight, the same order as our own world.
Its sun
Its star is hotter than the Sun (6,635 K), burning brighter and faster. It shares the system with 1 other known planet.
How far is that, really?
At 1,303 light-years, tonight's light from this system left it around the year 723. A Voyager-speed probe would need roughly 23,047,468 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 2017 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.