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Nature volume 88, page 358 (11 January 1912) | Download Citation



OBSERVATIONS OF COMETS 1911c, 1911e, 1911f, AND 1911g.—In No. 4544 of the Astronomische Nachrichten Dr. Bemporad discusses at length the photometric observations of Brooks's comet (1911c), made at the Catania Observatory during the period August 14 to November 28, 1911. The greatest apparent brightness was recorded on October 23, when the comet was about as bright as a 3.5 magnitude star. On a chart accompanying the paper he plots the curves i = k/r2δ2 and i = k/r4δ2 with the curve of observed magnitudes, and this shows that the comet became brighter even than the value given by the latter formula. A fourth curve, on which the intensities reduced to δ= 1 are shown, indicates that the rise of intensity near perihelion was very steep, the magnitude rising from 9.5 on October 12 to 4.8 at perihelion.

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