HD 189831
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 20h 03m 33.45912s |
| Declination | −37° 56′ 26.5236″ |
| Apparent magnitude (V) | 4.77 |
| Characteristics | |
| Spectral type | K5III |
| U−B color index | +1.68 |
| B−V color index | +1.41 |
| Astrometry | |
| Radial velocity (Rv) | -38.30 km/s |
| Proper motion (μ) | RA: +64.47 mas/yr Dec.: -86.43 mas/yr |
| Parallax (π) | 8.90±0.29 mas |
| Distance | 370 ± 10 ly (112 ± 4 pc) |
| Absolute magnitude (MV) | -0.48 |
| Details | |
| Luminosity | 316 L☉ |
| Temperature | 4,099 K |
| Rotational velocity (v sin i) | < 1.0 km/s |
| Other designations | |
| CD-38°13828, FK5 3602, GC 27779, GSC 07947-03890, HIP 98761, HR 7652, HD 189831, SAO 211767 | |
| Database references | |
| SIMBAD | data |
HD 189831 is a class K5III (orange giant) star in the constellation Sagittarius. Its apparent magnitude is 4.77 and it is approximately 366 light years away based on parallax.