Almach (Gamma Andromedae)
Numéro d’image : 12631919
| Gamma Andromedae is Almach, one of the most beautiful double stars in the night sky. It is the third brightest star in the constellation of Andromeda. In a telescope, Almach can be seen to be a gold and blue pair of stars separated by 9.58 arcseconds. The primary star (Gamma 1 Andromedae, also known as the A component) is a spectral-type K3 giant with a golden-yellow color. The secondary star (Gamma 2 Andromedae), at a position angle of 63 degrees, is an A-type main sequence star. Gamma 2 Andromedae is itself a double star with components labeled B and C that are separated by less than 1 arcsecond. Subsequent spectroscopic observations in 1957 to 1959 revealed that B is another double star, making the entire Gamma Andromedae system a quadruple star. The Almach star system is located 350 light-years away. Johann Tobias Mayer discovered that Almach was a double star in 1778, and Wilhelm Struve discovered that Gamma 2 Andromeda was a double star in | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / Lodriguss, Gerard |
| Taille de l’image : | 3840 px × 2550 px |
| Model Release : | Non requis |
| Property Release : | Non requis |
| Restrictions : | - |
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