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X(2), X(4), X(6), X(23), X(111), X(524), X(671), X(895), X(10415) cevian points of X(671) 

K273 is a circular pK with pole X(111), the Parry point, and pivot X(671), a point on the Steiner ellipse which is the isotomic conjugate of the isogonal conjugate of X(111). K273 is tangent at A, B, C to the symmedians. The singular focus F is X(11258), the reflection of O in X(111). K273 is the isogonal transform of K043, the Droussent medial cubic, and also the antigonal transform of K008, the Droussent cubic. K273 is a member of the class CL043 : it meets the circumcircle at A, B, C and three other points where the tangents are concurrent. Here, these points are X(111) and the circular points at infinity hence the isotropic tangents and the tangent at X(111) meet at F. Locus properties :

