Working at Hamilton College in Clinton , New York ( near Utica ) , he was a good finder of asteroids , finding 48 of them , beginning with 72 Feronia in 1861 and ending with 287 Nephthys in 1889 . Working at Hamilton College in Clinton , New York ( near Utica ) , he was a prolific discoverer of asteroids , discovering 48 of them , beginning with 72 Feronia in 1861 and ending with 287 Nephthys in 1889 .