Kepler-33 c — 3.2 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 13 days; about 740 °C, hotter than boiling water; found in 2011 by transit.
Kepler-33 f — 4.5 times Earth's width, Neptune-sized; its year lasts 41 days; about 420 °C, hotter than boiling water; found in 2011 by transit.
Kepler-33 e — 4 times Earth's width, Neptune-sized; its year lasts 32 days; about 480 °C, hotter than boiling water; found in 2011 by transit.
Kepler-33 d — 5.4 times Earth's width, Neptune-sized; its year lasts 22 days; about 580 °C, hotter than boiling water; found in 2011 by transit.
Kepler-33 b — 1.7 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 6 days; about 1,100 °C, hot enough to melt rock; found in 2011 by transit.
NASA Exoplanet Archive, Planetary Systems Composite Parameters (fetched 2026-11-02). Composite values: where a planet's size or mass was not measured, the archive estimates it from the other.
This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with NASA under the Exoplanet Exploration Program.