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see the general equation of Kw(P) in CL017. 

X(53), X(216), X(264), X(393), X(1249) midpoints of ABC 

K208 = Kw(X4) is the locus of poles of pK+ with pivot X(4). It is a member of the class CL017 of cubics. The locus of the point of concurrence of the asymptotes is K412 = Kc'(X4). See CL018. For example :
See also the class CL019 of pivotal cubics with pivot H. K208 is also psK(X14569, X2, X53) in PseudoPivotal Cubics and Poristic Triangles. See also K207 = Kw(X1). 
