HD 168607
HD 168607 is the right star of the pair below the Omega Nebula. The other is the hypergiant HD 168625. | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 18h 21m 14.889s |
| Declination | −16° 22′ 31.76″ |
| Apparent magnitude (V) | 8.12 - 8.29 |
| Characteristics | |
| Spectral type | B9Ia+ |
| U−B color index | 0.41 |
| B−V color index | 1.54 |
| J−K color index | 1.06 |
| Variable type | LBV |
| Astrometry | |
| Radial velocity (Rv) | −30 km/s |
| Proper motion (μ) | RA: 0.563 mas/yr Dec.: −1.468 mas/yr |
| Parallax (π) | 0.6438±0.0603 mas |
| Distance | 5,100 ± 500 ly (1,600 ± 100 pc) |
| Absolute magnitude (MV) | −8.4 |
| Details | |
| Radius | 187 R☉ |
| Luminosity | 240,000 L☉ |
| Surface gravity (log g) | 1.0 cgs |
| Temperature | 9,300 K |
| Other designations | |
| V4029 Sgr, HD 168607, BD−16°4829, SAO 161374, HIP 89956, AAVSO 1815-16 | |
| Database references | |
| SIMBAD | data |
HD 168607 (V4029 Sagittarii) is a blue hypergiant and luminous blue variable (LBV) star located in the constellation of Sagittarius, easy to see with amateur telescopes. It forms a pair with HD 168625, also a blue hypergiant and possible luminous blue variable, that can be seen at the south-east of M17, the Omega Nebula.