Arthur Allen Hoag (1921–1999) was an American astronomer most famous for his discovery of Hoag's object in 1950. He was the son of Lynne Arthur Hoag (Harvard Medical School, Cornell, and University of Michigan faculty member) and wife Wylma Wood Hoag. He had two sisters, Mary Alice (born 1922) and Elizabeth Ruth (born 1919), a son named Tom and a daughter named Stefanie. His mother and sister Mary (aged 3) died on June 1, 1926 when the Washington Irving was rammed by an oil barge and sunk on the North River.
Asteroid 3225 Hoag, discovered by Carolyn and E. M. Shoemaker, was named after him. He received his Ph.D. in Astronomy from Harvard in 1953 under Bart Bok. He was director of the Lowell Observatory in Flagstaff, Arizona from 1977. He was noted for his work in photoelectric and photographic photometry. He also developed astronomical instruments. He researched quasistellar sources.
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