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On 2012 January 19, observers in the northeastern United States of Americaobserved an occultation of 8.0-mag HIP 41337 star by the Jupiter-Trojan (911)Agamemnon, including one video recorded with a 36cm telescope that shows a deepbrief secondary occultation that is likely due to a satellite, of about 5 km(most likely 3 to 10 km) across, at 278 km $\pm$ 5 km (0.0931 arcsec) from theasteroid's center as projected in the plane of the sky. A satellite this smalland this close to the asteroid could not be resolved in the available VLTadaptive optics observations of Agamemnon recorded in 2003. The outline ofAgamemnon is fit well by an ellipse with dimensions 190.6 $\pm$ 0.9 km by 143.8$\pm$ 1.5 km. The angular diameter of HIP 41337 was found to be 0.5 $\pm$ 0.1milli-arcsec. After (624) Hektor, this could be the second Jupiter Trojanasteroid known to possess a small satellite.

Occultation Evidence for a Satellite of the Trojan Asteroid (911) Agamemnon