4827 Dares
4827 Dares is a larger Jupiter trojan from the Trojan camp, approximately in diameter. It was discovered on 17 August 1988 by American astronomer Carolyn Shoemaker at the Palomar Observatory in California. The dark D-type asteroid has a rotation period of 19.0 hours. It was named after Dares from Greek mythology.
Orbit and classification
Dares is a dark Jovian asteroid in a 1:1 orbital resonance with Jupiter. It is located in the trailering Trojan camp at the Gas Giant's Lagrangian point, 60° behind on its orbit. It is also a non-family asteroid of the Jovian background population. It orbits the Sun at a distance of 4.9–5.4 AU once every 11 years and 7 months. Its orbit has an eccentricity of 0.05 and an inclination of 8° with respect to the ecliptic.The body's observation arc begins with a precovery at Palomar in November 1954, almost 34 years prior to its official discovery observation.
Physical characteristics
In the SDSS-based taxonomy, Dares is a dark D-type asteroid. It is also characterized as a D-type by Pan-STARRS' survey.Rotation period
In February 1994, a rotational lightcurve of Dares was obtained over five nights of observation by Stefano Mottola and Anders Erikson using the ESO 1-metre telescope at La Silla Observatory in Chile. Lightcurve analysis showed a well-defined rotation period of hours with a brightness variation of 0.24 magnitude.In October 2013, photometric observations in the R-band by astronomers at the Palomar Transient Factory in California gave a concurring period of 18.967 hours with an amplitude of 0.23 magnitude.