At least two asteroidal flybys will be performed during the ROSETTA
 mission, according to the most recent plannings developed by the
 ROSETTA team (ESA). Taking into account that, apart from the NEAR
 mission to Near Earth Asteroids (NEA), there are not other space
 missions to asteroidal bodies planned in the next decades, this will
 be a very important opportunity for improving the present knowledge of
 the asteroids, after the recent data collected by the GALILEO probe on
 the two objects 951  Gaspra and 243 Ida. ISO observations will allow
 to infer in advance the albedo and the diameter of the ROSETTA
 targets. These data will be a very useful support to the overall
 mission strategy for what concerns the asteroidal observations.
 The final choice of the asteroids that will be observed by ROSETTA
 has not yet been made, since it depends upon some details of the
 overall mission strategy, which at present are  still under scrutiny.
 In the present proposal we refer to the expected properties of the
 most probable target asteroids which have been indicated in the last
 ROSETTA meetings. On the basis of the final decision the number of
 targets might be increased, and the identity of the targets could be
 changed, but the plausible range of IR fluxes should remain in any
 case the one defined by the two typical objects examined in the
 present proposal.