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Star in the constellation Grus From Wikipedia, the free encyclopedia
Tau3 Gruis is a solitary[7] star in the southern constellation of Grus. Its apparent 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 on parallax, and it is drifting further away with a radial velocity of 6 km/s.[4]
Observation data Epoch J2000.0 Equinox J2000.0 (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−B color index | +0.17[2] |
B−V color 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 | |
Database references | |
SIMBAD | data |
This is an Am star[8] with a stellar classification of kA5hA7mF2.[3] 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.[9] It has 2.9[1] times the Sun's radius and is radiating 27[1] times the luminosity of the Sun from its photosphere at an effective temperature of around 7,735 K.[1]