LHS 1678 is 64.8 light-years from the Sun. The NASA Exoplanet Archive lists 3 planets around this M2.0 V star; the first was found in 2021 by transit (Transiting Exoplanet Survey Satellite (TESS)).
Fly there in 3DLHS 1678 b goes round its star every 20.6 hours, 102 times as often as Mercury goes round the Sun.
LHS 1678 is one of 2 stars in its system. The position of the other star is not catalogued, so only LHS 1678 and its planets are drawn.
| Spectral type | M2.0 V |
| Surface temperature | 3,490 K |
| Mass | 0.345 solar masses |
| Radius | 0.329 solar radii |
| Luminosity | 0.0145 times the Sun |
| Apparent magnitude | 12.6 |
| Age | about 7 billion years |
| Distance from the Sun | 64.8 light-years (19.9 parsecs) |
| Position (J2000) | RA 68.1790°, Dec -39.7909° |
| Constellation | Caelum |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| LHS 1678 b | 20.6 hours | 0.0124 AU | 0.685 R⊕ | 0.35 M⊕ | Transit, 2021 |
| LHS 1678 c | 3.69 days | 0.0327 AU | 0.941 R⊕ | 1.4 M⊕ | Transit, 2021 |
| LHS 1678 d | 4.97 days | 0.0400 AU | 0.981 R⊕ | 0.907 M⊕ estimated | Transit, 2024 |
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 3,490 K, 0.015 times as bright as the Sun, the habitable zone, where starlight could keep water liquid on a rocky surface, runs from about 0.12 to 0.24 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 65 years ago, within living memory.