  It is customarily assumed that Earth-striking meteoroids are completely
random, and that all the impacts must be interpreted as uncorrelated events
distributed according to Poisson statistics. If this is correct, their impact
dates must be uniformly spread throughout the year and their impact coordinates
must be evenly scattered on the surface of our planet. Here, we use a time- and
yield-limited sample of Earth-impacting superbolides detected since 2000 to
explore statistically this critical though frequently overlooked topic. We show
that the cadence of these multi-kiloton impact events is incompatible with a
random fall pattern at the 0.05 significance level or better. This result is
statistically robust and consistent with the observed distribution of the
longitudes of the ascending nodes of near-Earth objects (NEOs). This lack of
randomness is induced by planetary perturbations, in particular Jupiter's, and
suggests that some of the recent, most powerful Earth impacts may be associated
with resonant groups of NEOs and/or very young meteoroid streams. An intriguing
consequence of this scenario is that the impact hazard of Chelyabinsk-like
objects should peak at certain times in the year.
