HIP 99770 b
HIP 99770 b is a directly imaged superjovian extrasolar planet orbiting the dusty 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.
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 | |
| 16.9+3.4 −1.9AU | |
| Eccentricity | 0.25+0.14 −0.16 |
| Inclination | 148+13 −11 |
| Star | HIP 99770 |
| Physical characteristics | |
Mean radius | 1 RJ |
| Mass | 16.1+5.4 −5.0 MJ |
| Temperature | 1,400 K |
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