 Best rated lightcurve analysis gave a rotation period of 26.606 hours with a brightness variation of 1.04–1.13 magnitude, which indicates that the body is highly elongated ().In November 2002, during the first photometric observations by Swiss astronomer Raoul Behrend at Geneva Observatory in collaboration with several other European astronomers, it was revealed that "Debussy" is a synchronous binary system with a minor-planet moon in orbit (F-type binary).The satellite's orbital period is 26.606 hours, identical to the primary's rotation.