Tau Sagittarii
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 19h 06m 56.40897s |
| Declination | −27° 40′ 13.5189″ |
| Apparent magnitude (V) | +3.326 |
| Characteristics | |
| Evolutionary stage | red clump |
| Spectral type | K1 III |
| U−B color index | +1.185 |
| B−V color index | +1.170 |
| Astrometry | |
| Radial velocity (Rv) | +45.4 km/s |
| Proper motion (μ) | RA: −50.61 mas/yr Dec.: −249.80 mas/yr |
| Parallax (π) | 28.3195±0.3134 mas |
| Distance | 115 ± 1 ly (35.3 ± 0.4 pc) |
| Absolute magnitude (MV) | 0.48 |
| Details | |
| 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 km/s |
| Age | 7.91 Gyr |
| Other designations | |
| Namalsadirah 2, Rabi al Sadira, τ Sagittarii, τ Sgr, Tau Sgr, 40 Sagittarii, CPD−27°6617, FK5 1496, GC 26291, HD 177716, HIP 93864, HR 7234, PPM 269078, SAO 187683 | |
| Database references | |
| SIMBAD | data |
Tau Sagittarii (Tau Sgr, τ Sagittarii, τ Sgr) is a star in the southern zodiac constellation of Sagittarius.