Abstract

We introduce stellar photometry, its purpose and relationship to other astronomical quantities, presenting it within the context of astronomical research at the Vatican Observatory. We demonstrate the usefulness of the Vilnius Photometric System previously shown at Vilnius Astronomical Obs., Edinburgh Royal Obs., and Università di Roma “La Sapienza”, and then adopted by the Vatican Observatory for use with its Vatican Advanced Technology Telescope on Mount Graham, AZ, USA. The development of astronomical observations has led from photographic plates, through photoelectric detectors to the use of sensitive CCD cameras. Expanding the photoelectric databank of “Vilnius Stars”, we describe the development of new techniques of data-acquisition, calibration to photometric standards, stellar classification and interstellar-matter characterization. Looking ahead, we briefly describe the extensive data set, and our plans for further detailed analyses.