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K665

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X(3), X(4), X(39), X(550)

points at infinity of the McCay cubic K003

points of pK(X6, X550) on the circumcircle

X5-OAP points, see Table 53

K665 is a stelloid with radial center X(549), the midpoint of OG.

Its asymptotes are parallel to those of the McCay cubic K003. K665 is spK(X3, X548) as in CL055. See also Table 54.

It is the isogonal transform of K664.

We meet this cubic in the paper "Another kind of Lemoine cubics".