X(1), X(3), X(2635)*
extraversions of X(2635)*
vertices of the cevian triangle of O
Q084 is the isogonal transform of the stelloidal quartic Q083.
It follows that Q084 is a quintic meeting the circumcircle at A, B, C and at the vertices of a square.
A, B, C are nodes with tangents the bisectors of ABC.
K373 is the locus of points whose polar conic in Q084 is a rectangular hyperbola. In other words, the cubic is the Laplacian of the quintic.