Octagrammic-enneagrammic duoprism

The octagrammic-enneagrammic duoprism, also known as stostedip or the 8/3-9/2 duoprism, is a uniform duoprism that consists of 9 octagrammic prisms and 8 enneagrammic prisms, with 2 of each at each vertex.

The name can also refer to the octagrammic-great enneagrammic duoprism.

Vertex coordinates
The coordinates of an octagrammic-enneagrammic duoprism, centered at the origin and with edge length 2sin(2π/9), are given by: where j = 2, 4, 8.
 * $$\left(±\sin\frac{2\pi}{9},\,±\left(\sqrt2-1\right)\sin\frac{2\pi}{9},\,1,\,0\right),$$
 * $$\left(±\sin\frac{2\pi}{9},\,±\left(\sqrt2-1\right)\sin\frac{2\pi}{9},\,\cos\left(\frac{j\pi}{9}\right),\,±\sin\left(\frac{j\pi}{9}\right)\right),$$
 * $$\left(±\sin\frac{2\pi}{9},\,±\left(\sqrt2-1\right)\sin\frac{2\pi}{9},\,-\frac12,\,±\frac{\sqrt3}{2}\right),$$
 * $$\left(±\left(\sqrt2-1\right)\sin\frac{2\pi}{9},\,±\sin\frac{2\pi}{9},\,1,\,0\right),$$
 * $$\left(±\left(\sqrt2-1\right)\sin\frac{2\pi}{9},\,±\sin\frac{2\pi}{9},\,\cos\left(\frac{j\pi}{9}\right),\,±\sin\left(\frac{j\pi}{9}\right)\right),$$
 * $$\left(±\left(\sqrt2-1\right)\sin\frac{2\pi}{9},\,±\sin\frac{2\pi}{9},\,-\frac12,\,±\frac{\sqrt3}{2}\right),$$