1 Introduction

This paper continues a series in which we present a photometry of rich, distant, open clusters (Kaluzny 1994, Paper I; Kaluzny & Rucinski 1995, Paper II; Kaluzny 1997, Paper III). The faint open cluster Trumpler 5 = Tr 5 (l=203 deg, b=+1.1 deg) was discovered and cataloged by Trumpler (1930). So far it received a little attention from observers. Dow & Hawarden (1970) obtained the photographic photometry and presented the color magnitude diagram (CMD) for a few dozen stars from the cluster field. Their photometry did not reach the main sequence of the cluster. Photographic study by Kalinowski (1979) revealed that Tr 5 is a highly reddened and old object. Janes & Adler (1982) used Kalinowski's data to estimate E(B-V)=0.80 and (m-M)_V=14.40 for the reddening and apparent distance modulus of the cluster, respectively. Examination of POSS charts reveals that the cluster is projected on the sky against distant opaque clouds of interstellar gas.