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∑ a/SA x (c^2 y^2 - b^2 z^2) = 0

X(1), X(19), X(63), X(1707), X(2128), X(2129), X(3377), X(3378), X(6203), X(6204), X(6212), X(6213), X(7347), X(7348), X(8769)

vertices of the cevian triangle of X(19)

Geometric properties :

K1039 is an example of pK anharmonically equivalent to the Orthocubic K006.

Other examples : K070a, K070b, K168, K170, K171, K233, K424a, K424b, K678, K707, K857, K1039, K1046, K1047, K1048.

K1039 is the barycentric products X(1) x K170 and X(75) x K171.