[1] Deiphobus is characterized as a dark D-type asteroid in the Tholen, Barucci, Tedesco, as well as in the SDSS-based taxonomy.
[5][18] In February 1994, observations by Stefano Mottola and Anders Erikson, using the ESO 1-metre telescope at La Silla Observatory in Chile, gave a slow rotation period of 58.66±0.18 hours with a brightness variation of 0.27±0.03 magnitude (U=3-).
According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Deiphobus measures between 118.22 and 131.31 kilometers in diameter, and its surface has an albedo between 0.037 and 0.060.
[9][10][11] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0396 and a diameter of 122.65 kilometers based on an absolute magnitude of 8.68.
This minor planet was named after the Trojan warrior, Deiphobus, son of King Priam (also see 108 Hecuba and 884 Priamus).