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Its period of a little over eleven years is the shortest attributable to a visible binary system, except that of Delta Equulei, provisionally determined by Professor Hussey in 1900 at 5·7 years, and indicated by spectroscopic evidence to be of uncommon brevity. Burnham's Catalogue of 1,290 Double Stars, discovered by him from 1871 to 1899, is a record of unprecedented interest.
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