The catalog of star positions and B-magnitudes for the circumpolar region (from 58º to 90º in declination) of Northern Sky Survey project has been created under the motto of the rational use of resources accumulated in UkrVO JDA (Joint Digital Archive) in MAO NASU. The total amount of processed plates is 477. Digitizing of astronegatives has been carried out using Microtek ScanMaker 9800XL TMA and Epson Expression 10000XL scanners, with the scanning mode-1200 dpi, the linear size of the plates-30x30 cm or 13000x13000 px. The catalog contains 1 975 967 stars and galaxies with B ≤ 16.5 m for the epoch of 1985.28. The coordinates of stars and galaxies were obtained in the Tycho-2 reference system, and Bvalue in the system of photoelectric standards. The internal accuracy of the catalog for all the objects is σ αδ = ± 0.23 "and σ B = ± 0.12 m (for stars in the range of B = 8 m-14 m errors are σ αδ = ± 0.11" and σ B = ± 0.06 m). Convergence between the calculated and reference positions is σ αδ = ± 0.06 "(for 171 124 stars from Tycho-2), and the convergence with photoelectric stellar B-magnitudes is σ B = ± 0.15 m (for 5130 stars). External accuracy from the comparison with UCAC-4 is σ αδ = ± 0.33 "(1 928 367 stars and galaxies were cross identified).
ABSTRACT. Almost 40-year history of FON project ended with the creation of the whole northern sky catalog of objects down to B ≤16.5 m . The idea of 4-fold overlapping of the northern sky with 6 wide-field astrographs has not been realized in full. For historical reasons it has been transformed into the 2-fold overlapping observational program of MAO NAS of Ukraine, resulted in three versions of the multimillion catalog of positions, proper motions, and B-magnitudes of stars. The first version of 1.2 million stars had been finished before the 2000s and is based on the AC object list. The measurements of plates were made by automatic measuring complex PARSEC, specially developed for massive photographic reviews. As the input list was limited by AC objects, the most part of stars on the FON plates remained unmeasured. Principles of workflow organization of such works formed the basis for the further development of the project using the latest IT-technologies. For the creation of the second and the third versions of the catalog, the list of objects was obtained as a result of total digitizing of plates and their image processing. The final third version contains 19.5 million stars and galaxies with the maximum possible for the photographic astrometry accuracy. The collection of plates, obtained in other observatories -participants of the project, are partially safe and can be used for the same astrometric tasks.
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