| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 18h 21m 19.548s[1] |
| Declination | −16° 22′ 16.0572″[1] |
| Apparent magnitude (V) | 8.30–8.41[2] |
| Characteristics | |
| Spectral type | B6Ia+[3] (B2—B8[4]) May be B60 due to hypergiant designation |
| U−B color index | +0.37[5] |
| B−V color index | +1.41[5] |
| J−K color index | 0.599 |
| Variable type | α Cygni[6] |
| Astrometry | |
| Radial velocity (Rv) | −4.00[7] km/s |
| Proper motion (μ) | RA: −0.71±1.20[1] mas/yr Dec.: +0.01±0.74[1] mas/yr |
| Parallax (π) | 0.6212 ± 0.0640 mas[8] |
| Distance | approx. 5,300 ly (approx. 1,600 pc) |
| Absolute magnitude (MV) | −8.39[4] |
| Details[4] | |
| Radius | 105 R☉ |
| Luminosity | 380,000 L☉ |
| Surface gravity (log g) | 1.74 cgs |
| Temperature | 14,000 K |
| Rotational velocity (v sin i) | 60 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 168625 (V4030 Sagittarii) is a blue hypergiant star and candidate luminous blue variable located in the constellation of Sagittarius easy to see with amateur telescopes. It forms a visual pair with the also blue hypergiant (and luminous blue variable) HD 168607 and is located to the south-east of M17, the Omega Nebula.
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