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Abstract <p>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 <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(2.06\pm 2.26\)</EquationSource> <!--BPhysMGU2570162Belyakova-m1--> </InlineEquation> mas/year (right ascension) and <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(0.66\pm 2.85\)</EquationSource> <!--BPhysMGU2570162Belyakova-m2--> </InlineEquation> 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 &gt; 100.</p>

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

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • A. A. Belyakova,
  • A. M. Tatarnikov

摘要

Abstract

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 \(2.06\pm 2.26\) mas/year (right ascension) and \(0.66\pm 2.85\) 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.