James Craig Watson was a Canadian national, who studied at the University of Michigan and died in Madison, Wisconsin. He discovered 101 Helena which has a periapsis of 331683000.0 (kilometres).
101 Helena | discoverer | James Craig Watson James Craig Watson | alma mater | University of Michigan 101 Helena | periapsis | 331683000.0 (kilometres) James Craig Watson | nationality | Canada James Craig Watson | death place | Madison, Wisconsin