  The intermediate phases of planet formation are not directly observable due
to lack of emission from planetesimals. Planet formation is, however, a
dynamically active process resulting in collisions between the evolving
planetesimals and the production of dust. Thus, indirect observation of planet
formation may indeed be possible in the near future. In this paper we present
synthetic observations based on numerical N-body simulations of the
intermediate phase of planet formation including a state-of-the-art collision
model, EDACM, which allows multiple collision outcomes, such as, accretion,
erosion, and bouncing events. We show that the formation of planetary embryos
may be indirectly observable by a fully functioning ALMA telescope if the
surface area involved in planetesimal evolution is sufficiently large and/or
the amount of dust produced in the collisions is sufficiently high in mass.
