K2-141b
K2-141b (also designated EPIC 246393474.01) is a massive rocky exoplanet orbiting extremely close to an orange main-sequence star K2-141. The planet was first discovered by the Kepler space telescope during its K2 “Second Light” mission and later observed by the HARPS-N spectrograph. It is classified as an Ultra-short Period (USP) and is confirmed to be terrestrial in nature. Its high density implies a massive iron core taking up between 30% and 50% of the planet's total mass.
| Discovery | |
|---|---|
| Discovery site | Kepler Space Observatory |
| Discovery date | 2018 |
| Transit | |
| Orbital characteristics | |
| 0.00716 +0.00055 −0.00065 AU (1,071,000 +82,000 −97,000 km) | |
| Eccentricity | 0 |
| 0.2803244 ± 0.0000015 d (24,220.03 ± 0.13 s; 6.727786 ± 3.6×10−5 h) | |
| Inclination | 86.3 +2.7 −3.6 |
| Star | K2-141 |
| Physical characteristics | |
Mean radius | 1.51±0.05 R🜨 |
| Mass | 5.08±0.41 ME |
Mean density | 8.2 ± 1.1 g/cm3 (4.74 ± 0.64 oz/cu in) |
| 2.23 +0.35 −0.31 g | |
| Albedo | ~0.28±0.07 |
| Temperature | 2,039 K (1,766 °C) (equilibrium) 3,270 K (day side) 73.1 K (night side) |
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