2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/150114Motivated by questions occuring in the construction of certain twistor spaces the parameter space of conics tangent to a given quartic is investigated. For a given real quartic surface in complex $\PP ^3$ that has exactly 13 ordinary nodes as singularities this parameter space is studied. In particular, its irreducible components are described.31 pages, LaTeX 2.09. .tex and .dvi-Files also available at http://www-irm.mathematik.hu-berlin.de/~hadan/papers.htmlAlgebraic Geometrytext