Cygnus OB2-9
Artistic Representation of Cygnus OB2 #9 System | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 20h 33m 10.74s |
| Declination | +41° 15′ 8.2″ |
| Apparent magnitude (V) | 11.0 |
| Characteristics | |
| Evolutionary stage | Blue Supergiant + Blue Giant |
| Spectral type | O5I+O4III |
| Astrometry | |
| Radial velocity (Rv) | −36.9±5.2 km/s |
| Proper motion (μ) | RA: −2.766 mas/yr Dec.: −4.687 mas/yr |
| Parallax (π) | 0.5214±0.0196 mas |
| Distance | 6,300 ± 200 ly (1,920 ± 70 pc) |
| Details | |
| A | |
| Mass | ~34 M☉ |
| B | |
| Mass | ~30 M☉ |
| Other designations | |
| Cygnus OB2 #12, Schulte 9, 2MASS J20331074+4115081, HIP 101419, 3XMM J203310.7+411508, Gaia DR3 2067783623515353728 | |
| Database references | |
| SIMBAD | data |
Cygnus OB2 #9 (also known as Cyg OB2-9) is a massive O-type binary star system located in the Cygnus OB2 association, a young and massive OB association in the constellation of Cygnus. It consists of two hot, luminous supergiant and giant stars with strong stellar winds that collide, producing detectable non-thermal radio and X-ray emission. The system is notable for its eccentric orbit and has been the subject of multi-wavelength monitoring campaigns to study wind-wind interactions in massive binaries.