Anopolis message #150

Anopolis message #150
Let ABC be a triangle, P a point, Ha,Hb,Hc the orthocenters
of PBC, PCA, PAB, resp. and O1,O2,O3 the circumcenters
of HaBC, HbCA, HcAB, resp.

The locus of P such that HaHbHc, O1O2O3 are perspective is
the circumcircle and K003=pK(X6,X3), McCay cubic.