Small dispinosnub prismatosnub trishexacosichoron

The small dispinosnub prismatosnub trishexacosichoron, or sednaspastix, is a nonconvex uniform polychoron that consists of 600 small stellated dodecahedra, 4800 cubohemioctahedra (some of which lie in the same hyperplanes, forming 2400 compounds of two), 600 small dodecicosahedra, 600 rhombicosahedra, and 3600 pentagrammic prisms.

One small stellated dodecahedron, eight cubohemioctahedra (eight compounds), five small dodecicosahedra, five rhombicosahedra, and five pentagrammic prisms join at each vertex.

It can be obtained as the blend of 5 small dipentary hexacosihecatonicosachora and 5 small dipentary hecatonicosiprismatohecatonicosihexacosichora. In the process, some of the cubohemioctahedron cells blend out.

Vertex coordinates
Its vertices are the same as those of its regiment colonel, the small diretrosnub disnub decahecatonicosadishexacosichoron.