3 The faint photometric sequences

The lists of standards are presented in Tables 3 and 4. Table 3 contains 56 stars for the NGP region, and Table 4 lists 207 stars for the GPR. Each object is identified by two indices: (1) $N_{\rm CCD}$, the identification number from the CCD frames (cf. Table 1), and (2) ID$_{\rm POSS}$, the identifier derived from star positions at J2000, also listed in the tables.

These data are also available electronically at the Osservatorio Astronomico di Torino, via anonymous ftp to ftp.to.astro.it.

Acknowledgements

The authors are grateful to A. Ferrari for encouraging the collaboration between the ST ScI and Torino Observatory. We thank J. Huchra for supporting the observations, and L. Siciliano who contributed to the reduction of the CCD frames in the GPR. We acknowledge financial support from the Italian Ministry for Research (MURST) and the Italian Space Agency (ASI) under contract ASI-95-RS-119. The ST ScI is operated by the Association of Universities for Research in Astronomy, Inc., under contract to NASA.

 

Table 3: NGP: photometry and position of the CCD standards in fields I, II, III

 

Table 4: GPR: photometry and position of the CCD standards

 

Table 4: continued

 

Table 4: continued

 

Table 4: continued