Beta Gruis

"Tiaki" redirects here. For the Japanese proper name, see Chiaki.
Beta Gruis
Location of β Gruis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Grus
Right ascension 22h 42m 40.05027s[1]
Declination −46° 53′ 04.4752″[1]
Apparent magnitude (V) 2.146[2] (2.0 - 2.3[3])
Characteristics
Evolutionary stage AGB[4]
Spectral type M4.5 III[5]
U−B color index +1.757[2]
B−V color index +1.620[2]
Variable type SRb[3]
Astrometry
Radial velocity (Rv)+1.6[6] km/s
Proper motion (μ) RA: +135.16[1] mas/yr
Dec.: −4.38[1] mas/yr
Parallax (π)18.43 ± 0.42 mas[1]
Distance177 ± 4 ly
(54 ± 1 pc)
Absolute magnitude (MV)−1.61±0.052[7]
Details
Mass2.4[8] M☉
Radius154[9] R☉
Luminosity3,221±242[9] L☉
Surface gravity (log g)0.4[10] cgs
Temperature3,508±125[9] K
Metallicity [Fe/H]0.0[10] dex
Age450[11] Myr
Other designations
Tiaki, Beta Gru, CD−47 14308, FK5 856, HR 8636, HD 214952, HIP 112122, SAO 231258.[12]
Database references
SIMBADdata

Beta Gruis (β Gruis, abbreviated Beta Gru, β Gru), formally named Tiaki /tiˈɑːki/,[13] is the second brightest star in the southern constellation of Grus. It was once considered the rear star in the tail of the constellation of the (Southern) Fish, Piscis Austrinus: it, with Alpha, Delta, Theta, Iota, and Lambda Gruis, belonged to Piscis Austrinus in medieval Arabic astronomy.[14]

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  13. ^ "Naming Stars". IAU.org. Retrieved 16 December 2017.
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