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X(2), X(67), X(141), X(524), X(9076), X(10415)

X(9076) on the circumcircle

K103 is the only pivotal circular cubic locus of M such that the trilinear polars of M and its isoconjugate M* are parallel. See Special Isocubics ยง4.3.5.

The pole and the pivot are both X(67) hence the isopivot is G and the tangents at A, B, C are the medians of ABC.

K103 is the only circular pK with coincident pole and pivot. Its singular focus is X(14654).

K103 is a member of the class CL007 of cubics.