Barnard's Star b
Artist's impression of Barnard b | |
| Discovery | |
|---|---|
| Discovered by | González Hernández et al. |
| Discovery site | ESPRESSO (VLT) |
| Discovery date | October 2024 |
| Radial velocity | |
| Designations | |
| Barnard b, GJ 699 b | |
| Orbital characteristics | |
| 0.0229±0.0003 AU | |
| Eccentricity | 0.03+0.03 −0.02 |
| 3.1542±0.0004 d | |
| Semi-amplitude | 0.440±0.036 m/s |
| Star | Barnard's Star |
| Physical characteristics | |
| Mass | ≥0.299±0.026 M🜨 |
| Temperature | 438 K (165 °C; 329 °F, equilibrium) |
Barnard's Star b, or Barnard b, is a sub-Earth-mass exoplanet closely orbiting Barnard's Star, a nearby red dwarf star six light-years from Earth. The planet was discovered using radial velocity observations from the ESPRESSO spectrograph on the Very Large Telescope, and was announced on 1 October 2024. It is the second from its star of four known planets in its system.
The designation "Barnard's Star b" was first used for a different planetary candidate announced in 2018, the existence of which was later refuted.