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Nature volume 13, page 428 | Download Citation



THE COMPANION OF SIRIUS.—Mr. Wentworth Erck, of Sherrington, Co. Wicklow, in a communication dated March 21, notes the fact of a considerable diminution in the angle of position of the small star accompanying Sirius, which was detected by Alvan Clark in January, 1862—since the earlier measures, and adds that he cannot now estimate it at more than 55°. This retrograde motion is a consequence of the theory of Dr. Auwers, supposing the comes to be the cause of the anomalous proper motion of Sirius, which has formed the subject of several elaborate memoirs by this eminent astronomer. His last elements of the presumed disturbing body, adapted to the form of double star orbits, are as follow:—

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