An accuracy estimation of the World CCD asteroid observations in the years 1999–2005

The MPC database of the asteroid observations (each position from near 20 millions) was used in analysis of observational accuracy for more than 300 active world observatories both professional and amateur. The values of the “Mean error of a single observation” σσ (for α,δα,δ) were derived based on the Pulkovo method of accuracy estimation. These values may be used for observatory weight assignment in the orbital improvement procedures. The accuracy of the best amateur observations is proved to be comparable with professional one (σ=±0″.20σ=±0″.20). The detailed results in electronic format are accessible from the first author.