 Artist's impression of the K2-33 system (orbit and star sizes to scale) compared to the planets of the inner Solar System, with their respective orbits outlined. | |
| Discovery[1][2] | |
|---|---|
| Discovered by | K2 (Kepler) mission |
| Discovery date | 21 June 2016 |
| Transit | |
| Orbital characteristics | |
| 0.0409 +0.0021 −0.0023[1] AU | |
| Eccentricity | 0.0[2] |
| 5.424865+0.000035 −0.000031[2] d | |
| Inclination | 89.1 +0.6 −1.1[2] |
| Star | K2-33 |
| Physical characteristics | |
| 5.04 +0.34 −0.37[2] R🜨 | |
| Mass | <3.6 MJ[1] |
| Temperature | 850 K (577 °C; 1,070 °F)[1] |
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 space telescope on its "Second Light" mission. It is located about 453 light-years (139 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.
K2-33b is among the youngest known exoplanets, at 9.3 million years old.