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Tau Sagittarii
Orange-hued giant star in the constellation Sagittarius / From Wikipedia, the free encyclopedia
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Tau Sagittarii (Tau Sgr, τ Sagittarii, τ Sgr) is a star in the southern zodiac constellation of Sagittarius.
Quick Facts Constellation, Right ascension ...
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Sagittarius |
Right ascension | 19h 06m 56.40897s[1] |
Declination | –27° 40′ 13.5189″[1] |
Apparent magnitude (V) | +3.326[2] |
Characteristics | |
Spectral type | K1 III[3] |
U−B color index | +1.185[2] |
B−V color index | +1.170[2] |
Astrometry | |
Radial velocity (Rv) | +45.4[4] km/s |
Proper motion (μ) | RA: –50.61[1] mas/yr Dec.: -249.80[1] mas/yr |
Parallax (π) | 28.3195 ± 0.3134 mas[5] |
Distance | 115 ± 1 ly (35.3 ± 0.4 pc) |
Absolute magnitude (MV) | 0.48[6] |
Details[7] | |
Mass | 1.25 M☉ |
Radius | 15.71 R☉ |
Luminosity | 87.6 L☉ |
Surface gravity (log g) | 2.15 cgs |
Temperature | 4,459 K |
Metallicity [Fe/H] | –0.27 dex |
Rotational velocity (v sin i) | 1.04[8] km/s |
Age | 7.91 Gyr |
Other designations | |
Database references | |
SIMBAD | data |
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