HD 183143
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Sagitta |
| Right ascension | 19h 27m 26.5636s |
| Declination | +18° 17′ 45.193″ |
| Apparent magnitude (V) | 6.71 - 6.95 |
| Characteristics | |
| Spectral type | B6-8 Ia-0 |
| Apparent magnitude (B) | 8.08 |
| Apparent magnitude (J) | 4.13 |
| Apparent magnitude (K) | 3.46 |
| U−B color index | +0.2 |
| B−V color index | +1.2 |
| Variable type | α Cyg? |
| Astrometry | |
| Proper motion (μ) | RA: −1.004 mas/yr Dec.: −5.703 mas/yr |
| Parallax (π) | 0.4296±0.0243 mas |
| Distance | 4,990±550 ly (1530±170 pc) |
| Absolute magnitude (MV) | −8.7 |
| Details | |
| Mass | 24.2±1.4 M☉ |
| Radius | 109±15 R☉ |
| Luminosity | 288,000+83,000 −65,000 L☉ |
| Surface gravity (log g) | 1.76±0.05 cgs |
| Temperature | 12,800±200 K |
| Rotational velocity (v sin i) | 37±5 km/s |
| Age | 7.59+0.54 −0.51 Myr |
| Other designations | |
| HT Sge, BD+18°4085, HD 183143, HIP 95657, SAO 104860 | |
| Database references | |
| SIMBAD | data |
HD 183143 (HT Sagittae) is a blue hypergiant star located in the constellation of Sagitta.
This star has an apparent magnitude of 6.9, meaning that cannot be seen with the naked eye, but is an easy target for binoculars or a small telescope.