Abstract
DOUBLE-STAR MEASURES AT CINCINNATI.—In Nos. 2 and 3 of the publications of the Cincinnati Observatory are two series of micrometrical measures of double-stars made with the 11-inch Merz refractor. The first series includes measures by Prof. O. M. Mitchell at the old Observatory, confined, with few exceptions, to the stars of the great Dorpat Catalogue, and made in the years 1846–48, a small number of which only had appeared in the Sidereal Messenger.—The second series comprises measures of objects situated for the most part beyond Struve's limit of south declination made in the years 1875–76, and will probably be found the most useful of the two, observations of these southern stars being as yet in small number. Mr. Ormond Stone, the present director at Cincinnati, remarks that “no systematic survey of the southern heavens similar to that made by Struve of the northern heavens has ever been undertaken,” and a large proportion of Sir John Hersche's doubles have never been properly measured micrometrically. The Cincinnati object-glass having been refigured by Alvan Clark during the last winter, the director purposes devoting the instrument to supplementing the labours of other astronomers by measuring double-stars between 15° and 35° of south declination; no doubt in the course of this work new binary systems will be detected.
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Our Astronomical Column . Nature 16, 29–30 (1877). https://doi.org/10.1038/016029a0
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DOI: https://doi.org/10.1038/016029a0