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.