HD 189831
Star in the constellation Sagittarius / From Wikipedia, the free encyclopedia
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]
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
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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 |
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