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    COMET 1907a (GIACOBINI).—he results of numerous observations of this comet are recorded in No. 4162 of the Astronomische Nachrichten, wherein there also appears a set of elements communicated by Prof. E. C. Pickering. On March 11, at Vienna, Dr. Rheden found that the comet was of the eleventh magnitude, and had a diameter of 30 with a central condensation.

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