1 Introduction

In 1981 we started our long-term program of regular photoelectric photometry of Galactic classical Cepheids. By now we have already obtained a total of more than 35 000 measurements in the $UBV(RI)_{\rm C}$ system for almost 500 objects both in the Northern and Southern sky. Most of our observations have been published by Berdnikov (1986, 1987b, 1992a-g, 1993), Berdnikov & Turner (1995a,b, 1998a,b), Berdnikov & Vozyakova (1995), Berdnikov et al. (1998) and Vozyakova & Ignatova (2000). All our observations (including the unpublished ones) are available in the INTERNET at:

ftp.sai.msu.su/pub/groups/cluster/cepheids/

Earlier (Berdnikov 1987a) we used our observations, in combination with those published by other authors, to determine distances and light-curve parameters for Galactic classical Cepheids with available photoelectric photometry in the BVRIfilters of the Johnson system and $(RI)_{\rm C}$ filters of the Cron-Cousins system. The resulting catalogue (Berdnikov 1987a) contained homogeneous data for 363 fundamental-mode pulsators and proved to be a very useful tool for the study of the distribution and kinematics of Cepheids in the Milky Way (Berdnikov 1987c; Berdnikov & Bogdanov 1989; Berdnikov & Efremov 1989, 1993; Dambis et al. 1995; Mishurov et al. 1997; Berdnikov et al. 1998; Glushkova et al. 1998). Since the publication of this catalogue we have collected extensive photoelectric data which, combined with published photometry, allows us to increase the number of stars with reliable light curves by $\sim$ 25 per cent. This, and also the fact that we recently refined some of the fundamental underlying assumptions and procedures used to calculate the Cepheid distances, namely interstellar extinction law (Berdnikov et al. 1996a) and PL relation (Berdnikov et al. 1996b), made it necessary to prepare a new version of our catalogue, which we present in this paper.