Astrometric observations of visual binaries using 26‑inch refractor at Pulkovo Observatory during 2014–2019

Abstract

We present 18,365 astrometric observations of 290 visual binaries obtained with the 26‑inch refractor of Pulkovo Observatory during 2014–2019. The separation between components is from 1″.3 to 37″ with a median value of 4″.8. For a single observation, the mean separation error is 0″.013, and the mean position angle error is 0∘.44/ρ, where ρ is an angular distance in arcseconds. We compare the observations of sample stars with the data from the Gaia DR2 catalog and the results of the ground‑based observations performed with other telescopes.