Fig. 1
Dynamical map of 6464 test particles in the region of the Hygiea family (black dots). We note the presence of the z1 secular resonance, which appears as an elongated diagonal strip of aligned test particles, near the Koronis family. Real asteroids in the region with H < 13.5 are shown as blue asterisks, the orbital position of (10) Hygiea itself appears as a magenta full dot.
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