Career
He joined the Marseille Observatory in 1864. In the course of his career, he discovered a number of asteroids and comets, including the periodic comet 19P/Borrelly. The asteroid 1539 Borrelly was named in his honor.
The following is an incomplete list of comets discovered or co-discovered by Borrelly:
C/1873 Q1 (Borrelly)
C/1877 C1 (Borrelly)
C/1877 G2 (Swift-Borrelly-Block)
C/1889 X1 (Borrelly)
19P/Borrelly
C/1909 L1 (Borrelly-Daniel).