K2-3 is 144 light-years from the Sun. The NASA Exoplanet Archive lists 3 planets around this M V star; the first was found in 2015 by transit (K2).
Fly there in 3DK2-3 b goes round its star every 10.1 days, 9 times as often as Mercury goes round the Sun.
| Spectral type | M V |
| Surface temperature | 3,844 K |
| Mass | 0.549 solar masses |
| Radius | 0.546 solar radii |
| Luminosity | 0.0587 times the Sun |
| Apparent magnitude | 12.168 |
| Age | about 6.9 billion years |
| Distance from the Sun | 143.8 light-years (44.1 parsecs) |
| Position (J2000) | RA 172.3354°, Dec -1.4551° |
| Constellation | Leo |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| K2-3 b | 10.1 days | 0.0747 AU | 2.078 R⊕ | 5.11 M⊕ | Transit, 2015 |
| K2-3 c | 24.6 days | 0.136 AU | 1.582 R⊕ | 2.68 M⊕ | Transit, 2015 |
| K2-3 d | 44.6 days | 0.201 AU | 1.458 R⊕ | 2.2 M⊕ | Transit, 2015 |
Values are the NASA Exoplanet Archive’s composite parameters. A radius marked estimated comes from a mass–radius relation; a mass marked minimum is M sin i. Planet sizes and colours in the 3D view are renderings: none of these worlds has been photographed as more than a point of light.
For a star of 3,844 K, 0.059 times as bright as the Sun, the habitable zone, where starlight could keep water liquid on a rocky surface, runs from about 0.25 to 0.48 AU. None of its known planets orbits inside it. The zone says how much starlight arrives, not whether a planet has water or air. The edges follow Kopparapu et al. (2014), as the 3D view draws them.
The light you see left 144 years ago, around 1880.