CCD Measurements of Double Stars at ASV and NAO Rozhen in 2019 and 2020

Abstract

Abstract We continued our series of CCD observations of double and multiple stars during 2019 and 2020. A total of 331 pairs were observed at two stations, Serbian Astronomical Station on the mountain of Vidojevica (ASV) and Bulgarian National Astronomical Observatory at Rozhen (NAOR). They were performed using two telescopes, 1.4 m at ASV, and 2 m at NAOR, and on them cameras of the same type, Andor iKon-L, are mounted. Here we give 382 relative coordinates for 331 pairs, because some pairs have measurements for several epochs or some pairs were measured at both stations. Out of this number, 18 pairs have calculated orbital elements and 11 pairs have calculated linear elements. For these pairs the residuals are given. The smallest measured separation is 1.″25, and the largest is 120.″65 for pair AC of multiple star WDS 00057+4549 = STT547. Four new pairs are also presented.