[en] The results of ground-based spectrophotometry of the comet P/Giacobini-Zinner (1984) near perihelion and the time of the International Cometary Explorer (ICE) encounter are presented. It is found that the H₂O(+)/CO(+) abundance ratio is 1.2 + or - 0.6 compared with the ICE result of approximately five. Analysis of the dust production as measured by the optical continuum predicts a dust impact rate on the S antenna of the ICE of 0.01/s or less at closest approach. This upper limit is consistent with the ICE results. 21 references