... Appendix: Effect of errors in the encoder roller and drive disk on tracking. ... Servo error. ... Table 1: Tracking error budget Component Component error (nm RMS ) Effect (mas RMS ) Az axis wobble Drive disk high freq. error 200 17.17 Guide roller error 50 8.58 Lower bearing high freq./nonrep. error 50 4.29 Alt axis wobble Bearing high freq./nonrep. error 50 4.86 Az encoding error Drive disk high freq error 200 4.59 Encoder capstan error 50 5.73 Encoder ...

. 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