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We present empirical color transformations between the Sloan Digital SkySurvey (SDSS) ugriz photometry and Johnson-Cousins UBVRI system and Becker'sRGU system, respectively. Owing to the magnitude of data that is becomingavailable in the SDSS photometric system it is particularly important to beable to convert between this new system and traditional photometric systems.Unlike earlier published transformations we based our calculations on starsactually measured by the SDSS with the SDSS 2.5-m telescope. The photometricdatabase of the SDSS provides in a sense a single-epoch set of 'tertiarystandards' covering more than one quarter of the sky. Our transformationsshould facilitate their use to easily and reliably derive the correspondingapproximate Johnson-Cousins or RGU magnitudes. The SDSS survey covers a numberof areas that were previously established as standard fields in theJohnson-Cousins system, in particular, fields established by Landolt and byStetson. We used these overlapping fields to create well-photometered starsamples on which our calculated transformations are based. For the RGUphotometry we used fields observed in the framework of the new Baselhigh-latitude field star survey. We calculated empirical color transformationsbetween SDSS photometry and Johnson-Cousins UBVRI and Becker's RGU system. Forall transformations we found linear relations to be sufficient. Furthermore weshowed that the transformations between the Johnson-Cousins and the SDSS systemhave a slight dependence on metallicity.Comment: 11 pages, 7 figures, Accepted for publication in A&

Empirical color transformations between SDSS photometry and other photometric systems