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Sigma 2166 consists of two stars of magnitudes six and seven and a half, distance 27", p. 280°. Sigma 2173 is a double of quite a different order. The magnitudes of its components are both six, the distance in 1899 0.98", p. 331°. It is evidently a binary in rapid motion, as the distance changed from about a quarter of a second in 1881 to more than a second in 1894.
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