![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/d/d1/Grus_constellation_map.svg/640px-Grus_constellation_map.svg.png&w=640&q=50)
Beta Gruis
Star in the constellation of Grus / From Wikipedia, the free encyclopedia
"Tiaki" redirects here. For the Japanese proper name, see Chiaki.
Beta Gruis (β Gruis, abbreviated Beta Gru, β Gru), formally named Tiaki /tiˈɑːki/,[11] 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.[12]
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
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] |
Distance | 177 ± 4 ly (54 ± 1 pc) |
Absolute magnitude (MV) | −1.61±0.052[7] |
Details | |
Mass | 2.4[8] M☉ |
Radius | 138[5][lower-alpha 1] R☉ |
Luminosity | 2,500[5] L☉ |
Surface gravity (log g) | 0.4[9] cgs |
Temperature | 3,480[5] K |
Metallicity [Fe/H] | 0.0[9] dex |
Other designations | |
Database references | |
SIMBAD | data |
Close