K2-288Bb
K2-288Bb (previously designated EPIC 210693462 b) is a super-Earth or mini-Neptune exoplanet orbiting in the habitable zone of K2-288B, a low-mass M-dwarf star in a binary star system in the constellation of Taurus about 226 light-years from Earth. It was discovered by citizen scientists while analysing data from the Kepler spacecraft's K2 mission, and was announced on 7 January 2019. K2-288 is the third transiting planet system identified by the Exoplanet Explorers program, after the six planets of K2-138 and the three planets of K2-233.
Artist’s impression of K2-288Bb orbiting its host star K2-288B, with the primary star K2-288A in the top left corner | |
| Discovery | |
|---|---|
| Discovery date | 7 January 2019 |
| Orbital characteristics | |
Semi-major axis | 0.164 (±0.03) AU |
Orbital period (sidereal) | 31.393463 +0.000067 −0.000069 d |
| Inclination | 89.81 +0.13 −0.17 |
| Star | K2-288B |
| Physical characteristics | |
Mean radius | 1.90 (±0.3) R🜨 |
| Temperature | 226.36 (±22.3) K (−46.79 °C; −52.22 °F) |
K2-288Bb is likely to be in the habitable zone of its host star, and thus may be capable on supporting life, though the planet's composition is unknown.
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