Sigma Sagittarii

Location of σ Sagittarii (circled)
Observation data
Epoch J2000      Equinox J2000
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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Nunki, which is released under the Creative Commons Attribution-Share-Alike License 3.0