Named in memory of Sergej Vasil’evich Shcherbakov (1856–1931), founder of the Nizhegorodskij circle of amateur physicists and astronomers, author of the first Manual of Cosmography in Russia and involved in establishing the Russian Astronomical Calendar. The name is also in memory of his granddaughter Marianna Valentinovna Shcherbakova (1910–1991), docent of geography of Kiev University and an active lecturer in the Kiev Planetarium. (M 19693) _ _.