Table 3: Astrometric calibration.

Observatory1		 Astrometric Date Scale $\sigma$(Scale) Orient. $\sigma$(Orient.) N_Stars Source
  standard field   ( $\hbox{$^{\prime\prime}$ }$/px) ( $\hbox{$^{\prime\prime}$ }$/px) ( $\hbox{$^\circ$ }$) ( $\hbox{$^\circ$ }$)   of coordinates
NAO M 15 1998 0.311 0.002 -1.68 0.03 13 Guide Star Catalogue (V7)
NAO NGC 1647 2000 0.310 0.001 -1.5 0.1 32 Geffert et al. (1992)
NAO M 15 2001 0.310 0.001 -2.04 0.02 8 Le Campion et al. (1996)
NAO M 67 2002 0.310 0.001 0.716 0.003 9 Tycho Catalogue (ESA 1997)
NAO M 67 2004 0.314 0.001 1.42 0.02 15+3 Girard et al. (1989)
AOB NGC 1647 1998 0.493 0.01 2.29 0.1 104 Geffert et al. (1992)
AOB M 15 1999 0.495 0.001 0.4 0.1 5 Guide Star Catalogue (V7)
AOB M 16 2000 0.493 0.001 -1.62 0.04 9 Hillenbrand et al. (1993)

1 NAO Rozhen: 2-m telescope; - AO Belogradchik: 0.6-m telescope; 2 Field I; - 3 Fields I and III; - 4 Fields I and IV.

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