Modern solutions give an orbital period of 74.9 years for the 1815 epoch. On 28 July 1887 the comet passed  from Mars and then passed perihelion on 8 October 1887.
Contemporary solutions yield an orbital period of 74.9 years for the 1815 epoch. On July 28, 1887, the comet traversed from Mars and subsequently passed perihelion on October 8, 1887.