HD 21693 is 108 light-years from the Sun. The NASA Exoplanet Archive lists 2 planets around this G8 V star; the first was found in 2019 by radial velocity (La Silla Observatory).
Fly there in 3DHD 21693 b goes round its star every 22.7 days, 4 times as often as Mercury goes round the Sun.
| Spectral type | G8 V |
| Surface temperature | 5,430 K |
| Mass | 0.8 solar masses |
| Radius | 0.914378 solar radii |
| Luminosity | 0.62 times the Sun |
| Apparent magnitude | 7.95 |
| Distance from the Sun | 108.5 light-years (33.3 parsecs) |
| Position (J2000) | RA 51.8040°, Dec -58.3233° |
| Constellation | Reticulum |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| HD 21693 b | 22.7 days | 0.145 AU | 2.8 R⊕ estimated | 8.23 M⊕ minimum | Radial Velocity, 2019 |
| HD 21693 c | 53.7 days | 0.259 AU | 4.34 R⊕ estimated | 17.37 M⊕ minimum | Radial Velocity, 2019 |
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 5,430 K, 0.62 times as bright as the Sun, the habitable zone, where starlight could keep water liquid on a rocky surface, runs from about 0.76 to 1.36 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 108 years ago, around 1920.