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We present an imaging survey aimed at searching for the stellar counterpartsof recently discovered ultra-compact high-velocity HI clouds (UCHVC). Adams etal. (2013) proposed these clouds to be candidate mini-haloes in the Local Groupand/or its surroundings, within a distance range of 0.25-2.0 Mpc. Using theLarge Binocular Telescope we obtain wide-field (~ 23' X 23') g- and r-bandimages of the twenty-five most promising and most compact clouds among thefifty-nine identified by Adams et al. Careful visual inspection of all theimages does not reveal any stellar counterpart even slightly resembling LeoP,the only local dwarf galaxy that was found as a counterpart to a previouslydetected high velocity cloud. Only a possible distant (D>3.0 Mpc) counterpartto HVC274.68+74.70-123 has been identified on our images. The point sourcephotometry in the central 17.3' X 7.7' chips reaches r<= 26.5, and is expectedto contain most of the stellar counterparts to the UCHVCs. However, no obviousstellar over-density is detected in any of our fields, in marked contrast toour comparison LeoP field in which the dwarf galaxy is detected at a >30 sigmasignificance level. Only HVC352.45+59.06+263 may be associated with a weakover-density, whose nature cannot be ascertained with our data. Sensitivitytests shows that our survey would have detected any dwarf galaxy dominated byan old stellar population, with an integrated absolute magnitude M_V<= -8.0, ahalf-light radius r_h<= 300 pc, and lying within 1.5 Mpc from us, therebyconfirming that it is unlikely that the observed UCHVCs are associated withstellar counterparts typical of known Local Group dwarf galaxies.

The StEllar Counterparts of COmpact high velocity clouds (SECCO) survey. I. Photos of ghosts