The synthesis and characterization of novel stars, octa(polyisobutylene-dimethylsiloxy)octasilsesquioxane (T-8(DPIB)), consisting of eight polyisobutylene arms emanating from an octa(dimethylsiloxy)octasilsesquioxane (T-8(D)) core are described. The synthesis involves : 1) The synthesis of ally-terminated polyisobutylene (PIB(sic)) prearms, 2) The synthesis of octa(hydrodimethylsiloxy)octasilsesquioxane (T-8(DH)) precore and 3) Star formation by hydrosilation of PIB(sic) with T-8(DH). Conditions for the precision synthesis and characterization of well-defined octa-arm stars are described.