Tau3 Gruis

For other stars with this Bayer designation, see τ Gruis.
Tau3 Gruis
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]
Distance265 ± 3 ly
(81.2 ± 0.8 pc)
Absolute magnitude (MV)+1.36[5]
Details
Radius2.88+0.13
−0.18[1] R☉
Luminosity26.8+0.3
−0.3[1] L☉
Temperature7,735+406
−158[1] K
Other designations
τ Gru, CD−48°14364, FK5 3832, HD 216823, HIP 113307, HR 8722, SAO 231364[6]
Database references
SIMBADdata

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]

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]

  1. ^ a b c d e f g h i j k Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference feinstein1974 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference abt1995 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Renson2009 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference gray2009 was invoked but never defined (see the help page).