Estimation of the Accuracy of Astrometrical Measurements with the ASTRONIRCAM on the 2.5-m Telescope of SAI Caucasian Mountain Observatory

The study presents the results of investigating the astrometric capabilities of the infrared camera ASTRONIRCAM installed on the 2.5-m telescope of the Caucasian Mountain Observatory of the Sternberg Astronomical Institute (SAI), Lomonosov Moscow State University. A method for correcting systematic errors using the Gaia DR3 catalog has been developed, achieving a coordinate measurement error of 0.11T-0.07 arcseconds. Based on 8-year observations of the field of the galaxy NGC 2617 with ASTRONIRCAM, the proper motions of 58 stars were measured with an accuracy of 2.06± 2.26 mas/year (right ascension) and 0.66± 2.85 mas/year (declination). The dependence of astrometric accuracy on photometric parameters was studied: the coordinate error increases linearly with FWHM and decreases hyperbolically with increasing SNR, stabilizing at SNR > 100.