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Alpha Gruis
Observation data
Epoch J2000      Equinox J2000
Constellation Grus
Right ascension 22h 08m 14.0s
Declination -46° 57′ 39.5″
Apparent magnitude (V) +1.73
Characteristics
Spectral type B7 IV
U-B color index -0.46
B-V color index -0.13
Variable type None
Astrometry
Radial velocity (Rv) +10.9 km/s
Proper motion (μ) RA: 127.6 mas/yr
Dec.: -147.9 mas/yr
Parallax (π) 32.16 ± 0.82 mas
Distance 101 ± 3 ly
(31.1 ± 0.8 pc)
Absolute magnitude (MV) -0.74
Details
Mass ? M
Radius 3.6 R
Luminosity 380 L
Temperature 13,500 K
Metallicity ?
Rotation ~236 km/s.
Age ? years
Other designations
Al Na'ir, Gl 848.2, HR 8425, CD -47°14063, HD 209952, GCTP 5339.00, SAO 230992, FK5 829, HIP 109268.

Alpha Gruis (α Gruis / α Gru) is the brighest star in the constellation Grus.

Alpha Gruis has a proper name Alnair or Al Nair (sometimes Al Na'ir), came from the Arabic al-nayyir [an-nai:r], meaning "the bright one". It is derived from the Arabic name of this star, al-Nayyir min Dhanab al-ḥūt (al-Janūbiyy), "the Bright (star) belongs to the Tail of (the constellation of) the (Southern) Fish".[1] Confusingly, Alnair is also given as the proper name for Zeta Centauri in an astronomical ephemerides in the middle of the 20th century.[2]

It with β, δ, θ. ι, and λ Gru belonged to Piscis Austrinus in traditional Arabic astronomy. [3]

References

  1. ^ Kunitzsch, P., & Smart, T., (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, MA: Sky Pub. p. 39. ISBN 9781931559447.  
  2. ^ Kunitzsch, P., (1959). Arabische Sternnamen in Europa. Wiesbaden: Otto Harrassowitz. p. 128.  
  3. ^ Allen, R. H., (1963). Star Names: Their Lore and Meaning (rep. ed.). New York, NY: Dover Publications Inc.. p. 237. ISBN 0486210790.  
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