| Observation data EpochJ2000.0 EquinoxJ2000.0 (ICRS) | |
|---|---|
| Constellation | Grus |
| Right ascension | 22h 56m 47.80007s[1] |
| Declination | −47° 58′ 09.1992″[1] |
| Apparent magnitude (V) | 5.71[2] |
| Characteristics | |
| Spectral type | kA5hA7mF2[3] |
| U−Bcolor index | +0.17[2] |
| B−Vcolor index | +0.22[2] |
| Astrometry | |
| Radial velocity (Rv) | 6.3±0.6[4] km/s |
| Proper motion (μ) | RA: −24.942[1]mas/yr Dec.: +2.848[1]mas/yr |
| Parallax (π) | 12.3180±0.1170 mas[1] |
| Distance | 265 ± 3 ly (81.2 ± 0.8 pc) |
| Absolute magnitude (MV) | +1.36[5] |
| Details | |
| Radius | 2.88+0.13 −0.18[1] R☉ |
| Luminosity | 26.8+0.3 −0.3[1] L☉ |
| Temperature | 7,735+406 −158[1] K |
| Other designations | |
| τ Gru,CD−48°14364,FK5 3832,HD 216823,HIP 113307,HR 8722,SAO 231364[6] | |
| Database references | |
| SIMBAD | data |
Tau3 Gruis is a solitary[7]star in the southernconstellation ofGrus. Itsapparent magnitude is 5.71,[2] which is bright enough to be visible to the naked eye as a dim, white-hued star. The star is located around 265 light-years (81 pc) distant from the Sun based onparallax, and it is drifting further away with aradial velocity of 6 km/s.[4]
This is anAm star[8] with astellar classification of kA5hA7mF2.[3] This notation indicates thespectrum displays thecalcium K-line of an A5 star, thehydrogen lines of an A7 star, and themetal lines of an F2 star.[9] It has 2.9[1] times theSun's radius and is radiating 27[1] times theluminosity of the Sun from itsphotosphere at aneffective temperature of around 7,735 K.[1]
{{cite web}}: CS1 maint: postscript (link)