Alhena

from Wikipedia, the free encyclopedia
Star
Alhena
Alhena (γ Gem) in the constellation Gemini
AladinLite
Observation
dates equinoxJ2000.0 , epoch : J2000.0
Constellation Twins
Right ascension 06 h 37 m 42.7 s
declination + 16 ° 23 ′ 57.3 ″
Apparent brightness 1.93 likes
Typing
B − V color index +0.00 
U − B color index +0.04 
R − I index −0.01 
Spectral class A0 IV
Astrometry
Radial velocity (−9.1 ± 1.2) km / s
parallax (29.84 ± 2.23)  mas
distance (109.3 ± 8.2)  ly
(33.5 ± 2.5)  pc  
Visual absolute brightness M vis −0.70 mag
Proper movement 
Rec. Share: (13.81 ± 2.36)  mas / a
Dec. portion: (−54.96 ± 1.77)  mas / a
Physical Properties
radius 3.3  R
Luminosity

160  L

Effective temperature 9200  K
Other names
and catalog entries
Bayer name γ Geminorum
Flamsteed name 24 Geminorum
Bonn survey BD + 16 ° 1223
Bright Star Catalog HR 2421 [1]
Henry Draper Catalog HD 47105 [2]
Hipparcos catalog HIP 31681 [3]
SAO catalog SAO 95912 [4]
Tycho catalog TYC 1329-1746-1 [5]
2MASS catalog 2MASS J06374273 + 1623574 [6]
Other names FK5 251
annotation
  1. ↑ Calculated from apparent brightness and distance.

Alhena is the name of γ Geminorum (Gamma Geminorum), the third brightest star in the constellation Gemini . Alhena has a brightness of +1.9 mag and is a white star of the spectral type A0 and luminosity class IV. Alhena belongs to the group of subgiants. The absolute brightness is −0.7 mag and the distance about 100 light years . Alhena has 160 times the luminosity of our sun and a surface temperature of approx. 9000 Kelvin .

The name Alhena comes from Arabic الهنعه, DMG al-Han'āh  'the mark (on the neck of the camel)'. Other name: Almeisan from Arabic المیسان, DMG al-Maisān  'the glow'.

See also

Web links

Individual evidence

  1. a b c Hipparcos catalog (ESA 1997)
  2. a b c Bright Star Catalog
  3. Pulkovo radial velocities for 35493 HIP stars
  4. a b c Hipparcos, the New Reduction (van Leeuwen, 2007)