We report new HST /STIS observations that map the high-ionization forbidden line emission in the inner arcsecond of Eta Car , the first that fully image the extended wind-wind interaction region of the massive colliding wind binary . These observations were obtained after the 2009.0 periastron at orbital phases 0.084 , 0.163 , and 0.323 of the 5.54-year spectroscopic cycle . We analyze the variations in brightness and morphology of the emission , and find that blue-shifted emission ( - 400 to - 200 { km s ^ { -1 } } ) is symmetric and elongated along the northeast-southwest axis , while the red-shifted emission ( + 100 to + 200 { km s ^ { -1 } } ) is asymmetric and extends to the north-northwest . Comparison to synthetic images generated from a 3-D dynamical model strengthens the 3-D orbital orientation found by Madura et al . ( 2011 ) , with an inclination i \approx 138° , argument of periapsis \omega \approx 270° , and an orbital axis that is aligned at the same PA on the sky as the symmetry axis of the Homunculus , 312° . We discuss the potential that these and future mappings have for constraining the stellar parameters of the companion star and the long-term variability of the system .