. Authors . Problem . Method . Advises . Contact Analysis of an accuracy of CCD asteroid observations carried out by professional and amateur astronomers . An accuracy estimation of CCD asteroid observations contained in the Minor Planet Center Database and carried out in the years 1999 - 2006 is realized. About 20 millions individual positions of the Numbered and Unnumbered Minor Planets were tested by means of calculations of (O-C) residuals to derive "mean error of a single observation" for more than 400

N NGC N Созв. ... C-1 NGC 188 Cep OC Open cluster 00h 44.4m +85 20' 8.1 14 C-2 NGC 40 Cep PN Planetary nebula 00h 13.0m +72 32' 12.4 0.6 C-3 NGC 4236 Dra SG Spiral galaxy 12h 16.7m +69 28' 9.7 19 x 7 C-4 NGC 7023 Cep BN Bright nebula 21h 01.8m +68 12' -- 18 x 18 Refl. nebula C-5 IC 342 Cam SG Spiral galaxy 03h 46.8m +68 06' 9.2 18 x 17 C-6 NGC 6543 Dra PN Planetary nebula 17h 58.6m +66 38' 8.1 5.8 Cat's Eye Neb. ... C-103 NGC 2070 Dor BN Bright nebula 05h 38.7m -69 06' -- 40 x 25 Tarantula Neb. ...