Named in memory of Charles Augustus Young (1834–1908), known affectionately as “Twinkle” Young by the Princeton students. He accepted the professorship of astronomy at Princeton in 1877, the year that his most famous student, Henry Norris Russell {see planet  (1762)}, was born. Earlier he was a professor at Dartmouth, as his father and grandfather had been. He discovered the green line (λ5304) in the solar corona in 1869, and the following year he was the first both to observe the “flash spectrum” and to photograph a prominence. In 1876 he made the first use of the grating spectroscope in astronomy for the determination of the Sun’s rotation period. The last of his three successful textbooks, Manual of astronomy, was updated by Russell, Dugan {see planet  (2772)} and Stewart in 1926. (M 8798) _ _.