Jupiter trojan
911 Agamemnon, provisional designation "1919 FD", is a large Jupiter trojan and a suspected binary asteroid from the Greek camp, approximately in diameter. It was discovered on 19 March 1919, by German astronomer Karl Reinmuth at the Heidelberg Observatory in southwest Germany. The dark D-type asteroid is one of the largest Jupiter trojans and has a rotation period of 6.6 hours. It is named after the Greek King Agamemnon, a main character of the "Iliad".
Orbit and classification.
"Agamemnon" is a dark Jovian asteroid orbiting in the Greek camp at Jupiter's leading L4 Lagrangian point, 60° ahead of its orbit in a 1:1 resonance ;templatestyles src="Crossreference/styles.css" / ;. It is also a non-family asteroid in the Jovian background population.
It orbits the Sun at a distance of 4.9–5.6 AU once every 12 years and 1 month (4,427 days; semi-major axis of 5.28 AU). Its orbit has an eccentricity of 0.07 and an inclination of 22° with respect to the ecliptic. The body's observation arc begins at Heidelberg in October 1927, more than 8 years after its official discovery observation.
Physical characteristics.
In the Tholen classification, "Agamemnon" is a dark D-type asteroid. It has also been characterized as a D-type in both the Tholen- and SMASS-like taxonomy of the Small Solar System Objects Spectroscopic Survey (S3OS2).
Rotation period.
Photometric observations of this asteroid during 1997 were used to build a lightcurve showing a rotation period of hours with a brightness variation of magnitude. A 2009 study yielded a period of hours, in reasonable agreement with the previous result.
Diameter and albedo.
According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, "Agamemnon" measures between 131.04 and 185.30 kilometers in diameter, based on a common absolute magnitude of 7.89 and a surface albedo between 0.037 and 0.072. A concurring diameter estimate of kilometers from an occultation event "(see below)" has also been obtained. The "Collaborative Asteroid Lightcurve Link" agrees with the results obtained by IRAS, that is, an albedo of 0.0444 and a diameter of 166.66 kilometers based on an absolute magnitude of 7.89.
 ;templatestyles src="Template:Hidden begin/styles.css"/ ;100+ largest Jupiter trojans
Shape and satellite.
A 2012 stellar occultation produced a 2D shape model of roughly (with an irregular, skewed outline) and are suggestive of "Agamemnon" to have a satellite of approximately kilometers in diameter orbiting at from the primary's center.
Naming.
This minor planet named from Greek mythology after King Agamemnon, the leader of the Greeks in the Trojan War. He is a main character of Homer's "Iliad". The official naming citation was mentioned in "The Names of the Minor Planets" by Paul Herget in 1955 (H 88).
References.
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