HIP 99770 b
Subaru Telescope detection of HIP 99770 b | |
| Discovery | |
|---|---|
| Discovered by | Currie et al. |
| Discovery site | Subaru Telescope |
| Discovery date | November 30, 2022 |
| Direct imaging | |
| Orbital characteristics | |
| 15.7+3.5 −1.0 AU | |
| Eccentricity | 0.31+0.06 −0.12 |
| 47+14 −4 years | |
| Inclination | 151.3+8.4 −12.0 ° |
| 279°+72° −269° | |
| 2,465,218+3,763 −771 JD | |
| 250°+68° −218° | |
| Star | HIP 99770 (29 Cygni) |
| Physical characteristics | |
| 1.056 RJ | |
| Mass | 13.6+4.8 −5.1 or 15.2+4.6 −4.4 MJ |
| Temperature | 1,300 K |
Spectral type | L8 |
HIP 99770 b is a directly imaged planet orbiting the A-type star HIP 99770 (29 Cygni), detected with Gaia/Hipparcos precision astrometry and high-contrast imaging. HIP 99770 b is the first joint direct imaging + astrometric discovery of an extrasolar planet and the first planet discovered using precision astrometry from the Gaia mission.