Processing results of digitized photographic observations of Pluto from the collections of the Ukrainian Virtual Observatory

The catalogue of 59 equatorial coordinates and magnitudes of the Pluto-Charon system for the period 1961–1990 was created based on digitized photographic observations from collections of the Joint Digital Archive of the Ukrainian Virtual Observatory obtained from five telescopes of three Ukrainian observatories. Developed software and scan processing techniques were successfully used. Parametric processing models were analyzed. The mean accuracy for the equatorial coordinates of Tycho-2 reference stars on digitized astronegatives is ±90 mas. The mean error of Tycho-2 B T magnitudes is ±0.32 m . Pluto positions were compared with the ephemeris JPL PLU43-DE431.