CEN 16
2MASS image of CEN 16 | ||
| Observation data Epoch J2000.0 Equinox J2000.0 | ||
|---|---|---|
| Constellation | Sagittarius | |
| Right ascension | 18h 20m 22.70s | |
| Declination | −16° 08′ 34.17″ | |
| Apparent magnitude (V) | 13.69 | |
| Characteristics | ||
| Evolutionary stage | Main sequence | |
| Spectral type | O8.5V | |
| Apparent magnitude (G) | 12.61 | |
| Apparent magnitude (K) | 8.884 | |
| Astrometry | ||
| Proper motion (μ) | RA: 0.339±0.022 mas/yr Dec.: −1.599±0.015 mas/yr | |
| Parallax (π) | 0.7051±0.0226 mas | |
| Distance | 4,600 ± 100 ly (1,420 ± 50 pc) | |
| Details | ||
| Mass | 20.4+7.9 −7.3 M☉ | |
| Radius | 10.9 R☉ | |
| Luminosity | 125000±37000 L☉ | |
| Surface gravity (log g) | 4.24+0.16 −0.22 cgs | |
| Temperature | 34000±1000 K | |
| Rotational velocity (v sin i) | 30+15 −25 km/s | |
| Age | 4 Myr | |
| Other designations | ||
| NGC 6618 258, ALS 19608, B311, SLS 165, Gaia DR2 4098003291268883584, Gaia DR3 4098003291268883584 | ||
| Database references | ||
| SIMBAD | data | |
CEN 16, also known as ALS 19608, is a O-type main sequence star in the constellation of Sagittarius. The star is located in the center of the Omega Nebula, roughly 4600±100 light years (or 1420±50 parsecs) away. The star has an apparent visual magnitude of 13.69. The star was discovered in March 1976 in a survey of stars in the Omega Nebula.