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In this paper we investigate the properties of SN 2009E, which exploded in arelatively nearby spiral galaxy (NGC 4141) and that is probably the faintest1987A-like supernova discovered so far. Spectroscopic observations whichstarted about 2 months after the supernova explosion, highlight significantdifferences between SN 2009E and the prototypical SN 1987A. Modelling the dataof SN 2009E allows us to constrain the explosion parameters and the propertiesof the progenitor star, and compare the inferred estimates with those availablefor the similar SNe 1987A and 1998A. The light curve of SN 2009E is lessluminous than that of SN 1987A and the other members of this class, and themaximum light curve peak is reached at a slightly later epoch than in SN 1987A.Late-time photometric observations suggest that SN 2009E ejected about 0.04solar masses of 56Ni, which is the smallest 56Ni mass in our sample of1987A-like events. Modelling the observations with a radiation hydrodynamicscode, we infer for SN 2009E a kinetic plus thermal energy of about 0.6 foe, aninitial radius of ~7 x 10^12 cm and an ejected mass of ~19 solar masses. Thephotospheric spectra show a number of narrow (v~1800 km/s) metal lines, withunusually strong Ba II lines. The nebular spectrum displays narrow emissionlines of H, Na I, [Ca II] and [O I], with the [O I] feature being relativelystrong compared to the [Ca II] doublet. The overall spectroscopic evolution isreminiscent of that of the faint 56Ni-poor type II-plateau supernovae. Thissuggests that SN 2009E belongs to the low-luminosity, low 56Ni mass, low-energytail in the distribution of the 1987A-like objects in the same manner as SN1997D and similar events represent the faint tail in the distribution ofphysical properties for normal type II-plateau supernovae.

SN 2009E: a faint clone of SN 1987A