17314 Aisakos (/ˈeɪsəkəs/; provisional designation 1977 RS₉) is a Jupiter trojan from the Trojan camp, approximately 36 kilometers (22 miles) in diameter. It was discovered at the Palomar Observatory during the first Palomar–Leiden Trojan survey in 1971. The dark Jovian asteroid has a rotation period of 9.7 hours.^[7] It was named after the Trojan prince Aesacus from Greek mythology.^[1]

Aisakos was discovered on 25 March 1971, by Dutch astronomer couple Ingrid and Cornelis van Houten at Leiden, on photographic plates taken by Dutch–American astronomer Tom Gehrels at Palomar Observatory in the Palomar Mountain Range, southeast of Los Angeles.^[1] The body's observation arc begins with a precovery taken at Palomar in November 1954, more than 16 years prior to its official discovery observation.^[1]

This minor planet was named from Greek mythology after the Trojan prince Aesacus (Aisakos), son of King Priam and his first wife Arisbe. As had been his maternal grandfather Merops, he was a seer and foresaw the downfall of Troy, brought upon by Hecuba's future son, Paris.^[1] The official naming citation was published by the Minor Planet Center on 9 March 2001 (M.P.C. 42365).^[10]

Aisakos is a Jupiter trojan in a 1:1 orbital resonance with Jupiter. It is located in the trailering Trojan camp at the Gas Giant's L₅ Lagrangian point, 60° behind its orbit (see Trojans in astronomy).^[4] It is also a non-family asteroid in the Jovian background population.^[5] It orbits the Sun at a distance of 4.8–5.6 AU once every 11 years and 9 months (4,288 days; semi-major axis of 5.17 AU). Its orbit has an eccentricity of 0.07 and an inclination of 11° with respect to the ecliptic.^[3]

Aisakos is an assumed C-type asteroid, while most larger Jupiter trojans are D-types.^[7]