Hektor - an exceptional D-type family among Jovian Trojans
Jakub Rozehnal, Miroslav Bro\v{z}, David Nesvorn\'y, Daniel D. Durda,, Kevin Walsh, Derek C. Richardson, Erik Asphaug

TL;DR
This paper identifies and analyzes collisional families among Jovian Trojans, including the unique case of the D-type asteroid Hektor, using clustering methods, collisional simulations, and dynamical evolution models to understand their origins and ages.
Contribution
It introduces new collisional families among Jovian Trojans, including the first associated with a D-type body, and models their formation and evolution in detail.
Findings
Identified three new Trojan families, including Hektor.
Estimated Hektor family age between 0.1 and 4 Gyr.
Demonstrated a possible single-impact origin for Hektor and its satellite.
Abstract
In this work, we analyze Jovian Trojans in the space of suitable resonant elements and we identify clusters of possible collisional origin by two independent methods: the hierarchical clustering and a so-called "randombox". Compared to our previous work (Bro\v{z} and Rozehnal 2011), we study a twice larger sample. Apart from Eurybates, Ennomos and families, we have found three more clusters --- namely families around asteroids (20961)~Arkesilaos, (624)~Hektor in the libration zone and (247341)~ in . The families fulfill our stringent criteria, i.e. a high statistical significance, an albedo homogeneity and a steeper size-frequency distribution than that of background. In order to understand their nature, we simulate their long term collisional evolution with the Boulder code (Morbidelli et al. 2009) and dynamical evolution using a modified…
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