Tau3 Gruis
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Grus |
| Right ascension | 22h 56m 47.76032s |
| Declination | −47° 58′ 09.1542″ |
| Apparent magnitude (V) | 5.71 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | kA5hA7mF2 |
| U−B color index | +0.17 |
| B−V color index | +0.22 |
| Astrometry | |
| Radial velocity (Rv) | 6.3±0.6 km/s |
| Proper motion (μ) | RA: −25.096 mas/yr Dec.: +2.455 mas/yr |
| Parallax (π) | 12.7125±0.0409 mas |
| Distance | 256.6 ± 0.8 ly (78.7 ± 0.3 pc) |
| Absolute magnitude (MV) | +1.36 |
| Details | |
| Radius | 2.88+0.13 −0.18 R☉ |
| Luminosity | 26.8+0.3 −0.3 L☉ |
| Temperature | 7,735+406 −158 K |
| Other designations | |
| τ Gru, CD−48°14364, FK5 3832, HD 216823, HIP 113307, HR 8722, SAO 231364 | |
| Database references | |
| SIMBAD | data |
Tau3 Gruis is a solitary star in the southern constellation of Grus. Its apparent magnitude is 5.71, which is bright enough to be visible to the naked eye as a dim, white-hued star. The star is located around 257 light-years (79 pc) distant from the Sun based on parallax, and it is drifting further away with a radial velocity of 6 km/s.
This is an Am star with a stellar classification of kA5hA7mF2. This notation indicates the spectrum displays the calcium K-line of an A5 star, the hydrogen lines of an A7 star, and the metal lines of an F2 star. It has 2.9 times the Sun's radius and is radiating 27 times the luminosity of the Sun from its photosphere at an effective temperature of around 7,735 K.