  We present results of the NELIOTA campaign for lunar impact flashes observed
with the 1.2 m Kryoneri telescope. From August 2019 to August 2023, we report
113 validated and 70 suspected flashes. For the validated flashes, we calculate
the physical parameters of the corresponding projectiles, the temperatures
developed during the impacts, and the expected crater sizes. For the multiframe
flashes we present light curves and thermal evolution plots. Using the whole
sample of NELIOTA that encompasses 192 validated flashes in total from 2017,
the statistics of the physical parameters of the meteoroids, the peak
temperatures of the impacts and the expected crater sizes has been updated.
Using this large sample, empirical relations correlating the luminous energies
per photometric band were derived and used to roughly estimate the parameters
of 92 suspected flashes of the NELIOTA archive. For a typical value of the
luminous efficiency, we found that more than the 75% of the impacting
meteoroids have masses between 1-200 g, radii between 0.5-3 cm and produced
craters up to 3.5 m. 85% of the peak temperatures of the impacts range between
2000 and 4500 K. Statistics regarding the magnitude decline and the cooling
rates of the multiframe flashes are also presented. The recalculation of the
appearance frequency of meteoroids, lying within the aforementioned ranges of
physical parameters, on the Moon yields that the total lunar surface is
bombarded with 7.4 sporadic meteoroids/ hour and up to 12.6 meteoroids/hour
when the Earth-Moon system passes through a strong meteoroid stream. By
extrapolating these rates on Earth, the respective rates for various distances
from its surface are calculated and used to estimate the probability of an
impact of a meteoroid with a hypothetical infrastructure on the Moon, or with a
satellite orbiting Earth for various impact surfaces and duration times of the
missions.
