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The photometric evolution of M31-RV has been investigated on 1447 plates ofthe Andromeda galaxy obtained over half a century with the Asiago telescopes.M31-RV is a gigantic stellar explosion that occurred during 1988 in the Bulgeof M31 and that was characterized by the appearance for a few months of an Msupergiant reaching M_bol=-10. The 1988 outburst has been positively detectedon Asiago plates, and it has been the only such event recorded over the periodcovered by the plates (1942-1993). In particular, an alleged previous outburstin 1967 (Sharov 1990, SvAL, 16, 199) is excluded by the more numerous anddeeper Asiago plates, with relevant implication for the interpretative modelsof this unique event. We outline a close analogy in spectral and photometricevolution with those of V838 Mon which exploded in our Galaxy in 2002. Theanalogy is found to extend also to the closely similar absolute magnitude atthe time of the sudden drop in photospheric temperature that both M31-RV andV838 Mon exhibited. These similarities, in spite of the greatly differingmetallicity, age and mass of the two objects, suggest that the same, universaland not yet identified process was at work in both cases.

M 31-RV evolution and its alleged multi-outburst pattern