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2 S^2 xyz + ∑ a^2 y z (c^2 y + b^2 z) = 0, or equivalently 2 S^2 xyz + ∑ a^2 x (c^2 y^2 + b^2 z^2) = 0, with S = 2*area(ABC) 

centers of the Apollonian circles points A', B', C' on (O) whose Simson lines S(A'), S(B'), S(C') pass through O 

K191 is an isogonal nK with root X(6) comparable to the Kjp cubic K024. See also Table 44. Locus properties

