Gamma Andromedae B and Gamma Andromedae C orbit each other with a period of 63.67 years at an average separation of only 0.3 arcseconds (33 astronomical units). The system is closer to us than Gamma Andromedae A, lying at a distance of about 260 light years. The spectroscopic binary system, Gamma Andromedae B, consists of two blue-white main sequence stars of the spectral type B9.5V. Gamma Andromedae system, image: Wikimedia Commons/Antonsusi Gamma 1 Andromedae and Gamma 2 Andromedae orbit each other with a period of 4,748 years. Gamma 2 Andromedae is itself a multiple star system consisting of a spectroscopic binary star system, Gamma Andromedae B, and a companion, Gamma Andromedae C. They appear as a contrasting pair separated by about 10 arcseconds. The main components are designated Gamma 1 Andromedae and Gamma 2 Andromedae or Gamma Andromedae A and Gamma Andromedae BC. Gamma Andromedae appears as a single star to the unaided eye but is in fact a multiple star system. The brighter component appears orange or yellow, while the dimmer one is bluish white. It is a popular target for stargazers because the main components form a striking contrasting pair, like Izar in Boötes and Albireo in Cygnus.

Almach lies at an approximate distance of 350 light years from Earth. It is only slightly fainter than Mirach and Alpheratz, the constellation’s brightest stars. With an apparent magnitude of 2.27, it is the third brightest point of light in Andromeda. Almach, Gamma Andromedae (γ And), is a quadruple star system located in the constellation Andromeda.

Planet centauri is starbound