K2-137b
| Discovery | |
|---|---|
| Discovered by | Smith et al. |
| Discovery site | Kepler Space Observatory |
| Discovery date | November 2017 (accepted) |
| Transit method | |
| Designations | |
| EPIC 228813918 b, UCAC4 420-056244 b, TIC 98720702 b, 2MASS J12272899-0611428 b | |
| Orbital characteristics | |
| 0.0058±0.0006 AU | |
| Eccentricity | 0 |
| 0.179715±0.000001 d | |
| Inclination | 89.6°±3.3° |
| Star | K2-137 |
| Physical characteristics | |
| 0.89±0.09 R🜨 or 0.64±0.10 R🜨 | |
| Mass | 1.01–2.80 M🜨 |
| Temperature | 1471±47 K (1,198 °C; 2,188 °F, equilibrium) |
K2-137b (also designated EPIC 228813918 b) is a hot, iron-rich, rocky exoplanet around the red dwarf K2-137 in the constellation Virgo about 99 parsecs (320 light-years) from Earth. It orbits the star very rapidly, with an orbital period of 0.1797 days (4.31 h), at a distance of just 0.0058 AU (870,000 km). It has received the Guinness World Record for the shortest orbital period for a confirmed planet, though the planetary candidate KOI-1843.03 has a period four minutes shorter.