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K2-33b
Young Super-Neptune orbiting K2-33 / From Wikipedia, the free encyclopedia
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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.
Quick Facts Discovery, Discovered by ...
![]() 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[1][2] | |
---|---|
Discovered by | K2 (Kepler) mission |
Discovery date | 21 June 2016 |
Transit | |
Orbital characteristics | |
0.0409 +0.0021 −0.0023[3] 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 | |
Mean radius | 5.04 +0.34 −0.37[2] R🜨 |
Mass | <3.7 MJ |
Temperature | 850 K (577 °C; 1,070 °F) |
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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).