We present optical and infrared observations of the unusual Type Ia supernova ( SN ) 2004eo .
The light curves and spectra closely resemble those of the prototypical SNÂ 1992A , and the luminosity at maximum ( M _ { B } = -19.08 ) is close to the average for a SNÂ Ia .
However , the ejected ^ { 56 } Ni mass derived by modelling the bolometric light curve ( about 0.45 M _ { \odot } ) lies near the lower limit of the ^ { 56 } Ni mass distribution observed in normal SNe Ia .
Accordingly , SN 2004eo shows a relatively rapid post–maximum decline in the light curve ( \Delta m _ { 15 } ( B ) _ { true } = 1.46 ) , small expansion velocities in the ejecta , and a depth ratio Si II \lambda 5972 / Si II \lambda 6355 similar to that of SN 1992A .
The physical properties of SNÂ 2004eo cause it to fall very close to the boundary between the faint , low velocity gradient , and high velocity gradient subgroups proposed by Benetti et al .
( 2005 ) .
Similar behaviour is seen in a few other SNe Ia .
Thus , there may in fact exist a few SNe Ia with intermediate physical properties .