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X(2), X(184), X(186), X(187), X(353), X(1340), X(1341), X(3148), X(5638), X(5639), X(11653)

other points below

K890 is a circular cubic invariant under the involution Psi described in the page K018 and in the paper "Orthocorrespondence and Orthopivotal Cubics", §5. See also the analogous focal cubic K508. K890 is a Psi-cubic as in Table 60.

K890 is an isogonal pK with pivot S = X(14917) (the infinite point of the line X184, X3148) in the triangle X(2)X(187)X(353) and it must contain the in/excenters of this triangle which are X(1340), X(1341), X(5638), X(5639).

The singular focus F is complicated with SEARCH = 0.258563183348133.

K890 contains E = Psi(X3148) = X(11653) in ETC (2017-01-11).

K890 meets the circumcircle again at P1, P2 on the line X(6)X(184) and P3, P4 on the line X(6)X(3148).

Their respective Psi-images Q1, Q2, Q3, Q4 lie on the Brocard circle. Moreover, Q1, Q2 lie on the line X(184)X(574) and Q3, Q4 lie on the line X(3148)X(574).

A lot of other collinearities on K890 can be found e.g. P1, P3, X(5638) – P1, P4, X(5639) – P1, Q1, E – P1, Q2, X(186), etc.