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X(2), X(4), X(6), X(598), X(1383), X(1992), X(1995)

cevians of X(598), contacts of the Lemoine ellipse with the sidelines of ABC

K283 is the pK with pole X(1383), the 1st Grinberg homothety center, and pivot X(598), the isogonal conjugate of the perspector of the Lemoine ellipse. It is the isogonal transform of K284.

It has the same points at infinity as pK(X6, X599).

It is a member of the class CL043 : it meets the circumcircle at A, B, C and three other points where the tangents are concurrent. These three points lie on pK(X6, X1992).