This page summarises some statistical information on the NEA discovery rates. Thanks to the operation of wide-field high sensitivity automated sky surveys the number of known NEAs is rapidly growing. Data and plots presented here aim at providing a continuously updated snapshot of the situation.
The first three histograms give an overview of the discovery rate over different time spans; in particular, the distribution of discoveries over the year exhibits a clear seasonal effect.
The cumulative diagrams are obtained by dividing the population into subsamples corresponding to different size ranges. They show that most of the large NEAs (diameter > 1 km) have already been detected, and therefore smaller objects dominate the present discoveries.
The last plot summarises the magnitude (size) distribution of the known NEA population, showing that a large fraction remains undetected, the most challenging being the small-size and inner Earth objects.