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X(2), X(4), X(126), X(193), X(468), X(524), X(671), X(2374) feet of altitudes (2SA  a^2) / [(SA  a^2)SA] : : , SA / (SA  a^2)^2 : : , 

K209 = pK(X468, X4) is a circular cubic invariant under orthoassociation. See CL019. Its singular focus is X(5512). It is an antigonal cubic and a member of the class CL019 of cubics. K209 is the locus of P such that P, X(193) and the DFpole of P are collinear. See CL039. 
