HD 189831 is a class K5III[3] (orange giant) star in the constellation Sagittarius. Its apparent magnitude is 4.77[2] and it is approximately 366 light years away based on parallax.[1]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 20h 03m 33.45912s[1] |
| Declination | −37° 56′ 26.5236″[1] |
| Apparent magnitude (V) | 4.77[2] |
| 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[1] mas/yr Dec.: -86.43[1] mas/yr |
| Parallax (π) | 8.90 ± 0.29 mas[1] |
| Distance | 370 ± 10 ly (112 ± 4 pc) |
| Absolute magnitude (MV) | -0.48[2] |
| Details | |
| Luminosity | 316[2] L☉ |
| Temperature | 4,099[6] K |
| Rotational velocity (v sin i) | < 1.0[7] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Constellation of Sagittarius | |
|---|---|
| Bayer | |
| Flamsteed | |
| Variable |
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| HR |
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| HD | |
| Gliese |
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| MOA | |
| OGLE |
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| PSR |
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| WR | |
| Other |
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| Exoplanets |
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