The namesake of the family is 2 Pallas, an extremely large asteroid with a mean diameter of about 512 km. The remaining bodies are far smaller; the largest is 5222 Ioffe with an estimated diameter of 22 km. This, along with the preponderance of the otherwise rare B spectral type among its members, indicates that this is likely a cratering family composed of ejecta from impacts on Pallas. Another suspected Palladian is 3200 Phaethon, the parent body of the Geminid meteor shower. The family was first noted by Kiyotsugu Hirayama in 1928.
From the diagram, their proper orbital elements lie in the approximate ranges
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