Alnair

from Wikipedia, the free encyclopedia
Star
Alnair (α Gru)
Al Nair in the constellation Crane
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation crane
Right ascension 22 h 08 m 13.99 s
declination -46 ° 57 ′ 39.5 ″
Apparent brightness 1.7 likes
Typing
B − V color index −0.070 ± 0.005 
U − B color index −0.47 
Spectral class B6 V
Astrometry
Radial velocity +11.8 km / s
parallax (32.16 ± 0.82)  mas
distance (101.4 ± 2.6)  ly
(31.1 ± 0.8)  pc  
Proper movement 
Rec. Share: +128  mas / a
Dec. portion: −148  mas / a
Physical Properties
radius (3.46 ± 0.33)  R ☉
Luminosity

380  L ☉

Effective temperature 13,500  K
Other names
and catalog entries
Bayer name α Gruis
Cordoba Survey CD −47 ° 14063
Bright Star Catalog HR 8425 [1]
Henry Draper Catalog HD 209952 [2]
Gliese catalog FY 848.2 [3]
Hipparcos catalog HIP 109268 [4]
SAO catalog SAO 230992 [5]
2MASS catalog 2MASS J22081397-4657393 [6]
Other names Alnair, FK5  829, GJ 9767

Alnair (spelling of the IAU ), also Alpha Gruis , α Gruis or α Gru ( Bayer name ), is a star in the southern sky about 100  light-years away in the constellation crane (Grus) in the southern sky. Alnair is a main sequence star of the spectral type B6 and, with an apparent magnitude of 1.7 mag, is one of the 50 brightest stars in the night sky.

The proper name Alnair goes back to the Arabic star name Al Nair "the light one".

See also

Web links

Individual evidence

  1. ↑ a b c d e SIMBAD database
  2. ↑ a b c d HR catalog at VizieR
  3. ↑ JMMC Stellar Diameters Catalog - JSDC (Lafrasse +, 2010) (calculated from the data values ​​LDD and Plx)
  1. ↑ See List of IAU-approved Star Names as of 10 August 2018 .