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RESEARCH PRODUCT

On the FON astroplate project accomplishment

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The plan for a photographic survey of the northern sky (FON) was proposed at the Golosiiv observatory (Main Astronomical Observatory, NAS of Ukraine, Kyiv, Ukraine) in the late 1970-ies [Pakuliak et al., 2016; Vavilova, 2016; Vavilova et al., 2017]. The last compilation of the final catalog of objects involves 5,700 digitized astroplates of four observatories: MAO NAS of Ukraine (Kyiv, Ukraine) [Andruk et al., 2016], Kitab Astronomical Observatory (Tashkent, Uzbekistan) [Yuldoshev et al., 2017], Gissar Astronomical Observatory (Dushanbe, Tajikistan) [Mullo-Abdolov et al., 2017, 2018], and the observatory in Baldone (Latvia) [Eglitis, 2017]. The consolidated catalog of positions and B-magnitudes of stars will cover the declination range from -20 to +90 degrees [Andruk et al., 2017]. The average epoch of the catalog is approximately 1987, the B-magnitude is ~ 17.5m. Positions of objects will be obtained in the Tycho-2 reference system and B-values in the reference frame of photoelectric standards. The roadmap of compilation includes corrections for the presence of the photometric color equation in B-values. Stellar magnitudes in U and V color bands have been obtaining by processing more than 5,400 plates exposed by the 1.2m Schmidt telescope in Baldone Observatory. The U, B, V magnitudes for stars brighter than V = 8.5m will be added from the existing photoelectric star catalogs. To determine the proper motions of stars, it is planned to use the GAIA project data. To date, the following has been done: On the basis of 2260 processed astroplates of Kyiv part of the FON project the catalog of positions and B magnitudes of 24.7 million objects down to B ≤ 16.5m was created. The catalog covers the northern hemisphere with δ from -4 to +90 degrees. The mean epoch of the catalog is 1988.2. The internal accuracy of the catalog for all the objects is σα,δ = ±0.28″ in positions and σB = ±0.17m in magnitudes (for stars in the range of B = 7m -14m these errors are σα,δ= ±0.13″ and σB = ±0.08m). The convergence between obtained and reference positions is estimated as σα,δ = ±0.06″. For magnitudes, this value is σB = ±0.14m. On the basis of 1963 processed astroplates of the Kitab part of the FON project, the catalog of positions and B-magnitudes of 13.4 million objects down to B ≤ 17.5m was completed. The catalog covers the declination zone from -20.5 to +2.5 degrees. The mean epoch is 1985.0. The internal accuracy of the catalog for all the objects is σα,δ = ±0.23″ in positions and σB = ±0.15m in magnitudes. These errors are σα,δ = ±0.085″ and ?B = ±0.054m for stars brighter than 14m. The convergence between calculated and reference positions is σα,δ = ±0.042″. This value is σB = ±0.16m for photoelectric B-magnitudes, The FON glass collection of Institute of Astrophysics of the Academy of Sciences of the Republic of Tajikistan includes around 1560 photographic plates. The first results of 130 plates’ processing show that the positional errors are σα,δ = 0.33″, and photometric ones are σB = 0.12m for the photometric interval of 5m … 17m. The convergence between calculated and reference positions of Tycho2 is σα,δ = 0.12″, the same value for obtained and reference Tycho2 magnitudes is σBT = 0.19m. The convergence of photometric estimations with photoelectric values is σB = 0.14m. To obtain another two color bands for the enhancement of the photometric system of the created catalog, the digitization and processing of U and V plates from the Baldone glass collection of 1.2m Schmidt telescope are on their way. The collection includes 780 and 4660 astroplates in the appropriate colors.