Eta Canis Majoris

≈ 100,000 L ☉

Aludra (Arabic عذرا al-' Adra - " virginity " ) is the name for the star η Canis Maiori ( Eta Canis Maiori ).

Aludra has an apparent magnitude of 2.45 mag and belongs to the spectral class B5. The distance from Aludra is about 2,000 light years. Aludra has an angular distance of 180 " at a position angle of 285 degrees, a companion of the brightness 7.0 like, which is already visible in binoculars. Aludra itself has about 100,000 times the luminosity of our Sun. He is a B5 star, and belongs to the Blue supergiants. Its surface temperature is about 18,000 Kelvin. Its diameter was calculated to be 30 times the solar diameter, but in this case the large uncertainty in the knowledge of the distance is taken into account. Ensign has physically very similar to Deneb in the constellation Cygnus, it is like this to the absolutely brightest stars in an area of ​​5,000 light years. Aludra is part of the star Association Collinder 121, to which, among other things Canis Majoris belongs Delta.