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Double Star is a science fiction novel by American writer Robert A. Heinlein, first serialized in Astounding Science Fiction (February, March, and April 1956) and published in hardcover the same year. It received the 1956 Hugo Award for Best Novel (his first).
Epsilon Lyrae (ε Lyr, ε Lyrae), also known as the Double Double, [8] is a multiple star system of at least five stars approximately 162 light-years away in the constellation of Lyra. Star system [ edit ]
Mizar is known as Vasishtha, one of the Saptarishi, and Alcor as Arundhati, wife of Vasishtha, in Indian astronomy. [8] As a married couple, they are considered to symbolize marriage and in some Hindu communities to this day priests conducting a wedding ceremony allude to or point out the asterism as a symbol of the closeness marriage brings to a couple.
The multiple star system of Mizar (the double star on the right) and Alcor (left). The unrelated, fainter star Sidus Ludoviciana can be seen lower down. Mizar is a visual double with a separation of 14.4 arcseconds, each of which is a spectroscopic binary. Its combined apparent magnitude is 2.04.
However, in a telescope it resolves into a double star consisting of β Cygni A (amber, apparent magnitude 3.1), and β Cygni B (blue-green, apparent magnitude 5.1). [34] Separated by 35 seconds of arc, [13] the two components provide one of the best contrasting double stars in the sky due to their different colors.
Over the years, many more double stars have been catalogued and measured. As of June 2017, the Washington Double Star Catalog, a database of visual double stars compiled by the United States Naval Observatory, contains over 100,000 pairs of double stars, [9] including optical doubles as well as binary stars. Orbits are known for only a few ...
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Winnecke 4 (also known as Messier 40 or WNC 4) is an optical double star consisting of two unrelated stars in a northerly zone of the sky, Ursa Major. The pair were discovered by Charles Messier in 1764 while he was searching for a nebula that had been reported in the area by Johannes Hevelius. Not seeing any nebulae, Messier catalogued this ...