  This paper contains the results from the first 30 months of the NELIOTA
project for impacts of NEOs/meteoroids on the lunar surface. Our analysis on
the statistics concerning the efficiency of the campaign and the parameters of
the projectiles and the impacts is presented. The parameters of the lunar
impact flashes based on simultaneous observations in two wavelength bands are
used to estimate the distributions of the masses, sizes and frequency of the
impactors. These statistics can be used both in space engineering and science.
The photometric fluxes of the flashes are measured using aperture photometry
and their apparent magnitudes are calculated using standard stars. Assuming
that the flashes follow a black body law of irradiation, the temperatures can
be derived analytically, while the parameters of the projectiles are estimated
using fair assumptions on their velocity and luminous efficiency of the
impacts. 79 lunar impact flashes have been observed with the 1.2 m Kryoneri
telescope in Greece. The masses of the meteoroids range between 0.7 g and 8 kg
and their respective sizes between 1-20 cm depending on their assumed density,
impact velocity, and luminous efficiency. We find a strong correlation between
the observed magnitudes of the flashes and the masses of the meteoroids.
Moreover, an empirical relation between the emitted energies of each band has
been derived allowing the estimation of the physical parameters of the
meteoroids that produce low energy impact flashes. The NELIOTA project has so
far the highest detection rate and the faintest limiting magnitude for lunar
impacts compared to other ongoing programs. Based on the impact frequency
distribution on Moon, we estimate that sporadic meteoroids with typical masses
less than 100 g and sizes less than 5 cm enter the mesosphere of the Earth with
a rate ~108 meteoroids/hr and also impact Moon with a rate of ~8 meteoroids/hr.
