5130 Ilioneus
5130 Ilioneus is a dark Jupiter trojan from the Trojan camp, approximately in diameter. It was discovered on 30 September 1989, by American astronomer Carolyn Shoemaker at the Palomar Observatory in California. The assumed C-type asteroid belongs to the [|70 largest Jupiter trojans] and has a rotation period of 14.8 hours. It was named after Ilioneus from Greek mythology.
Orbit and classification
Ilioneus is a dark Jovian asteroid orbiting in the trailering Trojan camp at Jupiter's Lagrangian point, 60° behind on the Gas Giant's orbit in a 1:1 resonance . It is also a non-family asteroid of the Jovian background population.It orbits the Sun at a distance of 5.2–5.3 AU once every 11 years and 11 months. Its orbit has an eccentricity of 0.01 and an inclination of 16° with respect to the ecliptic. The body's observation arc begins with a precovery taken at Palomar in December 1955, almost 34 years prior to its official discovery observation.
Naming
This minor planet was named by the discover from Greek mythology after Ilioneus, a ship commander and official spokesman under Aeneas. The official naming citation was published by the Minor Planet Center on 4 June 1993.Physical characteristics
Ilioneus is an assumed C-type asteroid. Its V–I color index of 0.96 is typical for most D-type asteroids, the dominant spectral type among the Jupiter trojans.Rotation period
Photometric observations of Ilioneus were obtained by Stefano Mottola in February 1994. Lightcurve analysis gave a rotation period of hours with a brightness amplitude of 0.16 magnitude.Follow-up observations by astronomers at the Palomar Transient Factory in 2013, and by Robert D. Stephens at the Center for Solar System Studies in 2015 and 2017, gave a concurring period determination with an amplitude between 0.18 and 0.34.