15385 Dallolmo ( 1997 SP4 ) is a Main-belt Asteroid that was found on September 25 , 1997 by the Osservatorio San Vittore at Bologna , Italy . 15385 Dallolmo ( 1997 SP4 ) is a main-belt asteroid discovered on September 25 , 1997 by Osservatorio San Vittore at Bologna .