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The ~15.1 years period found in the long-term UBV photoelectric andphotographic photometry of the symbiotic nova V1016 Cyg is detected also in the(J-K) colour index and in the UV continuum and emission line fluxes from IUEand HUT spectra. It could be interpreted either as the effect of recurrentenhanced mass loss episodes from the Mira type variable companion to a hotcomponent along its ultra-wide orbit (proposed from recent HST observations) orthe true orbital period of the inner, unresolved binary of a triple system. A410-day delay of the maximum of UV emission lines fluxes with respect to themaximum of continuum was found. The pulsation period of the Mira type variablewas improved to 474+/-6 days.Comment: 7 pages, 7 PostScript figures. Accepted for pubblication in A&

Multiwavelength evidence for a 15-year periodic activity in the symbiotic nova V1016 Cygni