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The possibility is investigated that the H$\alpha$ luminosity at the nebularepoch may be an additional indicator of $^{56}$Ni mass in type II supernovaewith plateau (SNe IIP), on the basis of available photometry and spectra. Wefirst derive the $^{56}$Ni mass from the $M_V$ magnitude on the radioactivetail using a standard approach. A confirmation of the correlation between$^{56}$Ni mass and plateau $M_V$ magnitude found recently by Hamuy (2003) isevident. There is strong evidence of a correlation between steepness of the $V$light curve slope at the inflection time and the $^{56}$Ni mass. If confirmed,this relation may provide distance and extinction independent estimates of theamount of $^{56}$Ni in SNe IIP. We then apply upgraded radioactive models ofH$\alpha$ luminosity at the nebular epoch and claim that it may be a goodindicator of $^{56}$Ni, if mass, energy and mixing properties vary moderately(within factor $\sim 1.4$) among SNe IIP . This method of the $^{56}$Ni massdetermination from H$\alpha$ luminosities yields results which are consistentwith the photometric mass of $^{56}$Ni mass to within 20%. This result alsoimplies that the parameters of SNe IIP events (mass, energy and mixingproperties) are rather similar among the majority of SNe IIP, except for rarecases of SN II intermediate between IIP and IIL (linear), of which SN 1970G isan example.Comment: 11 pages, 10 figures and 4 tables. to appear in A & A (accepted

Light curves and Hαluminosities as indicators of $\mathsf{^{56}}$Ni mass in type IIP supernovae