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Kepler-1921 b is a Neptune-like exoplanet (an ice giant with a thick atmosphere), about 2.9 times the radius of Earth. The planet completes one orbit around its star every 20.0 Earth days. It was discovered in 2021 using the transit method. It orbits the star Kepler-1921, located approximately 929 parsecs (3030 light-years) from Earth.
2021
Discovered
2.89
Earth Radii
Discovery Information
Discovery MethodTransit
Discovery Year2,021
Discovery FacilityKepler
Orbital Properties
Orbital Period20.0348 days
Semi-Major Axis0.1556 AU
Physical Properties
Radius (Jupiter)0.2582 RJ
Radius (Earth)2.8946 R⊕
Planetary Extremes
Where Kepler-1921 b sits on the spectrum of all known exoplanets.
Radius2.89 R⊕
TinyEnormous
Year Length20.0 days
LightningGlacial
Star Distance0.156 AU
ScorchedFrozen exile
Star System View
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Size Comparison
2.89x Earth's radius (0.26x Jupiter)
Orbit Comparison
Earth: 365.25 days (1 AU)Kepler-1921 b: 20.0 Earth days (0.156 AU)
Host Star: Kepler-1921
Effective Temperature6,120 K
Mass1.251 M☉
Radius2 R☉
Size vs Sun2.00x larger
Metallicity [Fe/H]0.02
Distance (pc)928.989 pc
Distance (ly)3030.0 light-years
Planets in the Kepler-1921 System
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