K2-155, also known as LP415-17, is a K-type red dwarf star in the constellation of Taurus. It is located around 267 light years from the Sun.
Features[]
With an apparent magnitude of 12.806, it is too faint to be visible to the naked eye. The radius of the star is 58% that of the Sun.
Interestingly, it is approximately 65% of the mass of the Sun, which means that it is a much larger type of red dwarf than normal. This suggests the star is not as active as a normal red dwarf, causing flares to occur less often than normal. An observation of this star, lasting 80 days, did not record any flares, which is quite impressive for a red dwarf. [1]
Planetary system[]
In 2018, a team of astronomers confirmed three Super-Earth planets were orbiting the star. One planet, K2-155 d, is orbiting within the inner edge of the star's habitable zone, which means that liquid water may exist on the planet.
| Planet | Mass | Semimajor axis | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | N/A | 0.0546 AU | 6.34365 days | N/A | N/A | 1.55 Earth radius |
| c | N/A | 0.0920 AU | 13.85402 days | N/A | N/A | 1.95 Earth radius |
| d | N/A | 0.1886 AU | 40.6835 days | 0.0186 ± 0.0002 | N/A | 1.64 Earth radius |