Confirmed exoplanet · Database record + computed analysis
Kepler-38 b
A confirmed world orbiting Kepler-38, 3,831.0 light-years away.
A Neptune-class world
4.30 Earth radii, in the ice-giant size range. With 122.0 Earth masses packed into that size, its density points to rock and iron rather than gas.
The orbit
Its year takes 106 Earth days (0.3 Earth years).
Temperature and starlight
Its equilibrium temperature (the airless-world estimate) is about 202 °C. Above water's boiling point. It receives 14.5 times the starlight Earth gets.
Its sun
Its star is Sun-like (5,623 K, G4 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 3,831 light-years, tonight's light from this system left it around the year -1804. A Voyager-speed probe would need roughly 67,780,324 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 2012 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.