1208 Troilus
1208 Troilus is a large and notably inclined Jupiter trojan from the Trojan camp, approximately in diameter. It was discovered on 31 December 1931, by German astronomer Karl Reinmuth at the Heidelberg Observatory in southern Germany. The unusual F-type asteroid belongs to the [|largest Jupiter trojans] and has a long rotation period of 56.2 hours. It was named after the Trojan prince Troilus, who was killed by Achilles.
Orbit and classification
Troilus is a dark Jovian asteroid orbiting in the trailing Trojan camp at Jupiter's Lagrangian point, 60° behind its 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 4.8–5.7 AU once every 12 years. Its orbit has an eccentricity of 0.09 and a high inclination of 34° with respect to the ecliptic. The body's observation arc begins with its official discovery observation at Heidelberg in December 1931.
Physical characteristics
In the Tholen classification, Troilus has an ambiguous and unusual spectrum, closest to that of an F-type and somewhat similar to a common C-type asteroid. It has also been characterized as a carbonaceous C-type in the Barucci taxonomy.Rotation period
In April 2007, a rotational lightcurve of Troilus was obtained from photometric observations by Lawrence Molnar at the Calvin-Rehoboth Robotic Observatory in New Mexico. Lightcurve analysis gave a rotation period of hours with a brightness variation of magnitude. While not being a slow rotator, Troilus has a significantly longer period than most asteroids, and one of longest of all larger Jupiter trojans.The period also supersedes previous observations made by Linda French with the 0.9-meter SMARTS telescope at Cerro Tololo in the 1980s and by Federico Manzini at the Sozzago Astronomical Station, which gave a period of 24 and 63.8 hours, respectively.