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.
With modern approaches, the comet's orbital period is calculated to be 74.9 years based on the 1815 epoch. Notably, it passed close to Mars on July 28, 1887, and reached its closest point (perihelion) on October 8, 1887.