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tokens: ACKNOWLEDGEMENTS We acknowledge helpful comments from the referee, which helped to clarify several aspects of the observations and analysis presented in this paper. We thank STScI science and technical staff members Peter McCullough and Amber Armstrong for special assistance in planning the DD time observations and Joe DePasquale for producing the colour HST image in Fig. 2 and the similar image superposed on the Chandra X-ray image in Fig. 6 . We thank both Kenji Hamaguchi and Mike Corcoran for discussions over many years concerning the X-ray emission from η Car’s outer shell. JM appreciates helpful discussions with John Raymond and Pat Hartigan. Based on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. Support was provided by NASA through grants GO-15596, GO-15289, GO-14768, and AR-14586 from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. NS’s research on Eta Carinae also received support from NSF grants AST-1312221 and AST-1515559.