![]() ![]() Location of σ Sagittarii (circled) |
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Observation data Epoch J2000 Equinox J2000 |
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Constellation | Sagittarius |
Right ascension | 18 |
Declination | –26° 17′ 48.2068″ |
Apparent magnitude (V) | 2.05 |
Characteristics | |
Spectral type | B2.5 V |
U−B color index | –0.761 |
B−V color index | –0.204 |
Astrometry | |
Radial velocity (Rv) | –11.2 km/s |
Proper motion (μ) | RA: +15.14 mas/yr |
Parallax (π) | 14.32 ± 0.29mas |
Distance | 228 ± 5 ly (70 ± 1 pc) |
Details | |
Mass | 7.8 ± 0.2M☉ |
Radius | 4.5R☉ |
Luminosity | 3,300L☉ |
Temperature | 18,890K |
Rotational velocity (v sin i) | 165 km/s |
Age | 31.4 ± 0.4Myr |
Other designations | |
Nunki, Sadira, 34 Sagittarii, CD–26 13595, FK5 706, HD 175191, HIP 92855, HR 7121, SAO 187448.
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