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61 Cygni (Gliese 820 AB) es una estrella binaria visual en la constelación del Cisne, formada por dos estrellas separadas 29 segundos de arco de magnitud aparente +5,21 y +6,03 respectivamente. Aparecen como un par de estrellas de color rojo-naranja, siendo una de las estrellas dobles más hermosas observables con prismáticos .
61 Cygni / ˈsɪɡni / is a binary star system in the constellation Cygnus, consisting of a pair of K-type dwarf stars that orbit each other in a period of about 659 years. Of apparent magnitude 5.20 and 6.05, respectively, they can be seen with binoculars in city skies or with the naked eye in rural areas without light pollution.
11 de ago. de 2023 · 61 Cygni is a binary system of two K-type dwarf stars, one of which is the 15th nearest known star system to the Earth. It has a high proper motion across the sky, making it the Flying Star, and it is about 11.4 light-years away. Learn more about its history, science and how to see it.
7 de sept. de 2017 · Una estrella de la constelación del Cisne fue crucial para entender la magnitud de las distancias estelares, y será la protagonista de la entrada de hoy: 61 cygni.
61 Cygni (Gliese 820 AB) es una estrella binaria visual en la constelación del Cisne, formada por dos estrellas separadas 29 segundos de arco de magnitud aparente +5,21 y +6,03 respectivamente. Aparecen como un par de estrellas de color rojo-naranja, siendo una de las estrellas dobles más hermosas observables con prismáticos.
61 Cygni, first star whose distance from Earth was measured. German astronomer Friedrich Wilhelm Bessel obtained a value of 10.3 light-years in 1838; the European Space Agency satellite Hipparcos made much more accurate distance measurements than ground-based telescopes had accomplished and obtained a distance to 61 Cygni of 11.4 light-years.
61 Cygni-A is an orange-red main-sequence dwarf star of spectral type K3.5-5.0Ve. It has about 70 percent of a solar mass, 72 percent of its diameter and about 8.5 percent of its luminosity. It appears to have about 79 percent of the Sun's metallicity. It appears to be a variable star.
