BD-210397 is 77.4 light-years from the Sun. The NASA Exoplanet Archive lists 2 planets around this K7 V star; the first was found in 2023 by radial velocity (La Silla Observatory).
Fly there in 3DBD-210397 c takes 17.1 years to go round its star once.
| Spectral type | K7 V |
| Surface temperature | 4,051 K |
| Mass | 0.679 solar masses |
| Radius | 0.747 solar radii |
| Luminosity | 0.135 times the Sun |
| Apparent magnitude | 9.84 |
| Age | about 6.2 billion years |
| Distance from the Sun | 77.4 light-years (23.7 parsecs) |
| Position (J2000) | RA 33.3024°, Dec -21.1962° |
| Constellation | Cetus |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| BD-210397 b | 5.2 years | 2.630 AU | 14 R⊕ estimated | 214 M⊕ minimum | Radial Velocity, 2023 |
| BD-210397 c | 17.1 years | 5.900 AU | 12.9 R⊕ estimated | 1525.6 M⊕ | Radial Velocity, 2023 |
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 4,051 K, 0.14 times as bright as the Sun, the habitable zone, where starlight could keep water liquid on a rocky surface, runs from about 0.38 to 0.71 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 77 years ago, within living memory.