Comet Wirtanen mostly refers to the periodic comet named 46P/Wirtanen. It may also be referring to any of the four comets below that were also discovered by American astronomer, Carl A. Wirtanen: C/1947 O1 (Wirtanen) C/1948 N1 (Wirtanen) C/1948 T1 (Wirtanen) C/1956 F1 (Wirtanen)