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Nature volume 127, page 418 (14 March 1931) | Download Citation



The Elongation of Eros.—The Daily Science News Bulletin for Feb. 6 issued by Science Service, Washington, D.C., contains some details of the elongation of Eros; they are based on a telegram from Johannesburg, transmitted through the T.A.U. Bureau, Copenhagen, and on observations by Mr. Leon Campbell at Harvard. It is concluded that the long diameter of Eros is 25 to 29 miles, and the axis of rotation 8 to 10 miles. The long diameter must be in the equatorial plane, and the earth must have been in this plane at the time when the light-variation was at a maximum, about last December; the slight dissymmetry between the two maxima would be explained by difference of albedo of the opposite faces. The exact time of rotation of Eros is given as 5n 16m 12?94s, but there are two maxima and two minima in this period. Bulletin 187 of Kwasan Observatory, Kyoto, gives 2h 38m 4?546s for the half period.

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