In Greek mythology, Deiphobus /diːˈɪfəbəs/ (Δηίφοβος) was a son of Priam and Hecuba. He was a prince of Troy, and the greatest of Priam's sons after Hector and Paris. Deiphobus killed four men of fame in the Trojan War.
According to the Iliad (books XII, XIV, XXII), in the Trojan War Deiphobus, along with his brother Helenus, led a group of soldiers at the siege of the newly constructed Argive wall and killed many, and wounded the Achaean hero Meriones. As Hector was fleeing Achilles, Athena took the shape of Deiphobus and goaded Hector to make a stand and fight. Hector, thinking it was his brother, listened and threw his spear at Achilles. When the spear missed, Hector turned around to ask his brother for another spear, but "Deiphobus" had vanished. It was then Hector knew the gods had deceived and forsaken him, and he met his fate at the hand of Achilles.
Some accounts hold that it was Deiphobus and Paris who ambushed and killed Achilles while luring him to their sister Polyxena. After the death of Paris, Deiphobus was given Helen as a bride for his deeds in the war, defeating the bid of his other brother, Helenus. Some accounts say the marriage was by force. When the Trojan Horse was in the city, Deiphobus accompanied Helen as she walked around the horse, calling out the names of the Greeks within in the voices of their wives, because she did not want to look like she was helping them. Menelaus and Odysseus had to hold the men inside back from responding. During the sack of Troy, Deiphobus was slain by either Odysseus or Menelaus, and his body was mutilated. Some accounts say it was Helen who killed him, or that she celebrated his death. Most accounts seem to indicate that, unlike her other two husbands, Helen didn't love Deiphobus and decided she would rather return to Menelaus.
1867 Deiphobus, provisional designation 1971 EA, is a large Jupiter trojan, about 123 kilometers in diameter. It was discovered by Argentine astronomers Carlos Cesco and A. G. Samuel at the Leoncito Astronomical Complex in Argentina on 3 March 1971.
The D-type minor planet orbits the Sun at a distance of 4.9–5.4 AU once every 11.61 years (4,242 days). It has an albedo of 0.042. Photometric observations of this asteroid during 1994 were used to build a light curve showing a slow rotation period of 58.66 ± 0.18 hours with a brightness variation of 0.27 ± 0.03 magnitude.
It was named after the Trojan warrior, Deiphobus, son of Priamus (also see 108 Hecuba and 884 Priamus).