Abstract
THE BINARY STAR a CENTAURI.—Mr. W. L. Elkin, who has been recently a student at the University of Strassburg, has given, in a dissertation for the degree of Doctor, a new determination of the orbit of this remarkable star, in which he has had the advantage of a fine series of measures executed by Sir T. Maclear, Mr. W. Mann, and Mr. G. Maclear at the Royal Observatory, Cape of Good Hope, collected and forwarded to him by Mr. Gill. We subjoin his elements, which, though not considered definitive, yet appear to represent the whole course of micrometrical measures very satisfactorily. Mr. Gill's measures in 1877 seem to indicate well the position of the companion about its nearest approach to the principal star, which it was feared at one time there would be danger of losing at this passage of the periastre. For the sake of comparison the provisional orbit deduced in 1879 by Dr. Doberck is annexed; the most noticeable difference is in the period of revolution.
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