Urbain Le Verrier
In 1844, Friedrich Wilhelm Argelander and Thomas James Henderson independently computed that the comet was a short period comet; by May, its period had been calculated to be 7.43 years. Urbain Le Verrier computed the positions for the 1851 apparition, predicting perihelion in April 1851. The comet was found close to his predicted position on 28 November 1850 by James Challis.