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X(1), X(4), X(110), X(147), X(1113), X(1114), X(2574), X(2575), X(32618), X(32619)

excenters Ia, Ib, Ic

vertices of the antimedial triangle Ga, Gb, Gc

A1 = X(4)Ga ∩ IbIc and B1, C1 likewise

A2 = X(4)Ga ∩ X(1)A and B2, C2 likewise

Q198 is mentioned by Ivan Pavlov in Euclid #9913.

Q198 is a circular circum-quartic with two isotropic asymptotes concurring at X(4) and two real asymptotes parallel to those of the Jerabek hyperbola and concurring at X(110).