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We present the observations of the binary lensing event MACHO-98-SMC-1conducted at the Mt.~Stromlo 74" telescope by the Microlensing Planet Search(MPS) collaboration. The MPS data constrain the first caustic crossing to haveoccurred after 1998 June 5.55 UT and thus directly rule out one of the two fitspresented by the PLANET collaboration (model II). This substantially reducesthe uncertainty in the the relative proper motion estimations of the lensobject.  We perform joint binary microlensing fits of the MPS data together with thepublicly available data from the EROS, MACHO/GMAN and OGLE collaborations. Wealso study the binary lens fit parameters previously published by the PLANETand MACHO/GMAN collaborations by using them as initial values for $\chi^2$minimization. Fits based on the PLANET model I appear to be in conflict withthe GMAN-CTIO data. From our best fit, we find that the lens system has aproper motion of $\mu = 1.3\pm 0.2 \kmsk$ with respect to the source, whichimplies that the lens system is most likely to be located in the SmallMagellanic Cloud strengthening the conclusion of previous reports.Comment: 20 pages, 4 color figure

Observations of the Binary Microlens Event MACHO 98‐SMC‐1 by the Microlensing Planet Search Collaboration