D9 (star)
Location of D9 Binary System near Sagittarius A* Black hole | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 17h 45m 40.0s |
| Declination | −29° 00′ 28″ |
| Characteristics | |
| Evolutionary stage | Herbig Ae/Be + T Tauri |
| Astrometry | |
| Distance | 26,000 ly |
| Orbit | |
| Period (P) | 372 ± 3 days |
| Semi-major axis (a) | 1.59 ± 0.01 AU |
| Details | |
| D9a | |
| Mass | 2.8 ± 0.50 M☉ |
| Age | 2.7+1.9 −0.3 Myr |
| D9b | |
| Mass | 0.7 ± 0.14 M☉ |
| Age | 2.7+1.9 −0.3 Myr |
| Other designations | |
| D9 | |
D9 is a binary star system located in the S Cluster, a dense group of stars orbiting Sagittarius A* (SgrA*), the supermassive black hole at the center of Milky Way Galaxy. D9 is located approximately 26,000 light-years from Earth. It is the first confirmed binary star system observed in such close proximity to a supermassive black hole, challenging existing models of star formation and stability in extreme gravitational environments.