K2-33b
K2-33b (also known by its EPIC designation EPIC 205117205.01) is a very young super-Neptune exoplanet, orbiting the pre-main-sequence star K2-33. It was discovered by NASA's Kepler spacecraft on its "Second Light" mission. It is located about 456 light-years (140 parsecs) away from Earth in the constellation of Scorpius. The exoplanet was found by using the transit method, in which the dimming effect that a planet causes as it crosses in front of its star is measured.
Artist's impression of the K2-33 system (orbit & star sizes to scale) compared to the planets of the inner Solar System, with their respective orbits outlined. | |
| Discovery | |
|---|---|
| Discovered by | K2 (Kepler) mission |
| Discovery date | 21 June 2016 |
| Transit | |
| Orbital characteristics | |
| 0.0409 +0.0021 −0.0023 AU | |
| Eccentricity | 0.0 |
| 5.424865+0.000035 −0.000031 d | |
| Inclination | 89.1 +0.6 −1.1 |
| Star | K2-33 |
| Physical characteristics | |
Mean radius | 5.04 +0.34 −0.37 R🜨 |
| Mass | <3.7 MJ |
| Temperature | 850 K (577 °C; 1,070 °F) |
Among known exoplanets, K2-33b is considered extremely young − a mere 9.3 million years old. Only one other exoplanet is younger, with an age of 2 Myr (V830 Tau b).
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