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The physical properties of the Tomimatsu-Sato delta=2 spacetime are analyzed,with emphasis on the issues of the negative mass distribution in this spacetimeand the origin of a massless ring singularity which are treated with the aid ofan equatorially asymmetric two-body configuration arising within the frameworkof the analytically extended double-Kerr solution. As a by-product of thisanalysis it is proved analytically that the Kerr spacetime with negative massalways has a massless naked ring singularity off the symmetry axis accompaniedby a region with closed timelike curves, and it is also pointed out that theBoyer-Lindquist coordinates in that case should be introduced in a differentmanner than in the case of the Kerr solution with positive mass.

On the physical interpretation of the delta=2 Tomimatsu-Sato solution