TASS Mark IV Photometric Survey of the Northern Sky

The Amateur Sky Survey (TASS) is a loose confederation of amateur and professional astronomers. We describe the design and construction of our Mark IV systems, a set of wide‐field telescopes with CCD cameras that take simultaneous images in the V and IC passbands. We explain our observational procedures and the pipeline that processes and reduces the images into lists of stellar positions and magnitudes. We have compiled a large database of measurements for stars in the northern celestial hemisphere with V‐band magnitudes in the range 7<V<13. This paper describes data taken over the 4 year period beginning in 2001 November. One of our results is a catalog of repeated measurements on the Johnson‐Cousins system for over 4.3 million stars.

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