X(1), X(23830), X(23831), X(23832), X(23833), X(23834), X(23835), X(23836), X(23837)
vertices of the circum-tangential triangle
infinite points of K024
Its root is X(4383) intersection of the lines X(2)X(6), X(43)X(55) and many others.
It is the locus of point M such that the circle with diameter MM* (isogonal conjugate) is orthogonal to the circle centered at O passing through I or, equivalently, the locus of M such that M and its isogonal conjugate M* are conjugated with respect to this same circle.
It is an equilateral unicursal cubic with three real asymptotes forming an equilateral triangle with center G whose circumradius is 4/3 r where r is the radius of the incircle. The incenter X(1) is the node.
It is a member of the pencil of cubics generated by K024 and the union of the line at infinity and the circumcircle.
See a generalization in the page K687.