2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/35207Misner initial data are a standard example of time-symmetric initial data with two apparent horizons. Compact formulae describing such data are presented in the cases of equal or non-equal masses (i.e. isometric or non-isometric horizons). The interaction energy in the "Schwarzschild + test particle" limit of the Misner data is analyzed.4 pages, RevTeX4, journal version, a reference added, minor correctionsGeneral Relativity and Quantum Cosmologytext