  The hyperbolic encounters of two massive objects are characterized by the
emission of a gravitational wave burst, with most of the energy released during
the closest approach (near the periastron). The detection of such events,
different from the well-known inspiral emission, would be an interesting
discovery and provide complementary information to observations of binary
mergers of black holes and neutron stars in the observable Universe, shedding
light, for instance, on the clustering properties of black holes and providing
valuable hints on their formation scenario. Here, we analyze the dynamics of
such phenomena in the simplest case where two compact objects follow
unbound/hyperbolic orbits. Moreover, we explore the effects of orbital
precession on the gravitational wave emission, since the precession encodes
certain general relativistic effects between two bodies. We also provide
templates for the strain of gravitational waves and the power spectrum for the
emission, and analytical expressions for the memory effect associated with such
signals.
