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X(4), X(30), X(265), X(477), X(7728)

X(7728) = reflection of X(265) in H

X(14989) = reflection of X(477) in H

K530 is the locus of pivots of circular pKs whose orthic line passes through the orthocenter H. See CL035.

For example, with pivots X(30), X(265), X(477) we obtain K001, K060 and the inversible (blue) pK with pole X3 x X477.

K530 is a central focal cubic with center and focus H.