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1I/'Oumuamua (or 1I) and 2I/Borisov (or 2I), the first InterStellar Objects(ISOs) discovered passing through the solar system, have opened up entirely newareas of exobody research. Finding additional ISOs and planning missions tointercept or rendezvous with these bodies will greatly benefit from knowledgeof their likely orbits and arrival rates. Here, we use the local velocitydistribution of stars from the Gaia Early Data Release 3 Catalogue of NearbyStars and a standard gravitational focusing model to predict the velocitydependent flux of ISOs entering the solar system. With an 1I-type ISO numberdensity of $\sim$0.1 AU$^{-3}$, we predict that a total of $\sim$6.9 suchobjects per year should pass within 1 AU of the Sun. There will be a fairlylarge high-velocity tail to this flux, with half of the incoming ISOs predictedto have a velocity at infinity, v$_{\infty}$, $>$ 40 km s$^{-1}$. Our modelpredicts that $\sim$92\% of incoming ISOs will be residents of the galacticthin disk, $\sim$6\% ($\sim$4 per decade) will be from the thick disk, $\sim$1per decade will be from the halo and at most $\sim$3 per century will beunbound objects, ejected from our galaxy or entering the Milky Way from anothergalaxy. The rate of ISOs with very low v$_{\infty}$ $\lesssim$ 1.5 km s$^{-1}$is so low in our model that any incoming very low velocity ISOs are likely tobe previously lost solar system objects. Finally, we estimate a cometary ISOnumber density of $\sim$7 $\times$ 10$^{-5}$ AU$^{-3}$ for 2I type ISOs,leading to discovery rates for these objects possibly approaching once perdecade with future telescopic surveys.

Interstellar Objects in the Solar System: 1. Isotropic Kinematics from the Gaia Early Data Release 3