About the Book
Editorial Reviews - Schwan (Sternbild) From the Publisher Kapitel: Albireo, Sadr, Schwan, Gliese 777, Deneb, Kokon-Nebel, Cygnus X-1, 61 Cygni, Cygnus A, Ngc 6888, Hd 188753, Seifenblasen-Nebel, P Cygni, Nordamerikanebel, Messier 29, Ngc 7027, Ngc 6826, Chi Cygni, Messier 39, Cygnus X-3, Ngc 7008, Ngc 6766, Cirrusnebel, Kepler-6, Ky Cygni, 16 Cygni Bb, Kohoutek 4-55, Lbn 171, Hd 187123, Hat-P-7b, Hd 187123 B, Hd 197036, Ruchba, Nova Cygni, Giennah, Ngc 6866, V476 Cygni, V1974 Cygni, Ngc 7063, Ngc 6819, Ngc 6811, Azelfafage, Ngc 6871, Ngc 6834, Ngc 7128, Ngc 7082, Ngc 7039, Ngc 6995, V1668 Cygni, Lbn245. Aus Wikipedia. Nicht dargestellt. Auszug: Albireo (ß Cyg / ß Cygni / Beta Cyg / Beta Cygni) is the fifth brightest star in the constellation Cygnus. Although it has the Bayer designation beta, it is fainter than Gamma Cygni, Delta Cygni, and Epsilon Cygni. Albireo appears to the naked eye to be a single star but can be resolved with a telescope into a double star, consisting of a brighter yellow star (actually a binary system of two stars in orbit) and a fainter blue star. Albireo is cherished by amateur astronomers as a beautiful small telescope object. AlbireoAlbireo is approximately 380 light-years (120 pc) away from the Earth. When viewed with the naked eye, Albireo appears to be a single star. However, when viewed with a telescope it readily resolves into a double star, consisting of Albireo A (amber, apparent magnitude 3.1), and Albireo B (blue-green, apparent magnitude 5.1.) Separated by 35 seconds of arc, the two components provide one of the best contrasting double stars in the sky due to their different colors. It is not known whether the two components are orbiting around each other in a physical binary system. If they are, their orbital period is probably at least 100,000 years. In 1976, component A was itself discovered to be a binary star, using speckle interferometry and the 2.1-meter telescope at the Kitt Peak National Observatory.
