HD 189831
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  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sagittarius[1] |
| Right ascension | 20h 03m 33.45912s[2] |
| Declination | −37° 56′ 26.5236″[2] |
| Apparent magnitude (V) | 4.77[1] |
| Characteristics | |
| Spectral type | K5III[3] |
| U−B color index | +1.68[4] |
| B−V color index | +1.41[4] |
| Astrometry | |
| Radial velocity (Rv) | −38.30[5] km/s |
| Proper motion (μ) | RA: +64.47[2] mas/yr Dec.: −86.43[2] mas/yr |
| Parallax (π) | 8.90±0.29 mas[2] |
| Distance | 370 ± 10 ly (112 ± 4 pc) |
| Absolute magnitude (MV) | −0.48[1] |
| Details | |
| Luminosity | 316[1] L☉ |
| Temperature | 4,099[6] K |
| Rotational velocity (v sin i) | < 1.0[7] 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[3] (orange giant) star in the constellation Sagittarius. Its apparent magnitude is 4.77[1] and it is approximately 366 light years away based on parallax.[2]
