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Sergey Pavlovich Glazenap (Russian:Серге́й Павлович Глазенап; 13(25) September 1848 - 12 April 1937) was aRussian andSovietastronomer, honorary member of theSoviet Academy of Sciences (1929), andHero of Socialist Labor (1932). In some publications, particularly in the 19th century, his last name was given asS. de Glasenapp (in French) orvon Glasenapp (in German).

He publishedOrbites des étoiles doubles du catalogue de Poulkova, a study ofdouble stars, for which he was awarded theValz Prize in 1890.

Glazenap crater on theMoon and the minor planet857 Glasenappia have been named after him.^[1]

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