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X(1), X(3), X(5373)

Q1, Q2, Q3 vertices of the Thomson triangle

excenters

I1, I2, I3 excenters of the Thomson triangle

F1, F2 real foci of the Steiner inellipse

infinite points of the McCay cubic

The Thomson triangle is formed by the intersections (apart A, B, C) of the Thomson cubic and the circumcircle.

Q091 is the locus of M such that M and its two isogonal conjugates in the triangles ABC and Q1Q2Q3 are collinear.

Q091 is also the locus of P such that there is a nodal cubic passing through the vertices of the triangles ABC, Q1Q2Q3 and whose tangents at its node P are perpendicular. See K626 for example.