Abstract
We present the results of determining the relative positions of 359 pairs of stars. More than 6000 photographic plates were obtained in 1960–2007 at the 26-inch refractor of the Pulkovo Observatory. The plates have been digitized with a Canon EOS 5D Mark II digital camera and a long-focus Jupiter 21M lens; the scalewas 21 μm/pixel. Themeasurements have been calibrated using a template digitized with the Belgian high-precision ROB Digitizer. The results have been thoroughly investigated for systematic errors. We have studied the scale of the 26-inch refractor and revealed its temperature and time dependences. The application of a new digitization, measurement, and calibration technique has allowed the accuracy to be increased compared to the past measurements. The single-exposure measurement accuracy is within the range from 2 to 70 mas, on average, 28 mas in both coordinates. The errors of the yearly mean positions are, on average, 8.7 mas in the angular separation and 0.05◦. in the position angle.
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Original Russian Text © I.S. Izmailov, E.A. Roshchina, A.A.Kiselev, T.P. Kiseleva, O.A. Kalinichenko, O.P. Bykov, O.V. Kiyaeva, L.G. Romanenko, N.A. Shakht, K.L. Maslennikov, T.A. Vasil’eva, 2016, published in Pis’ma v Astronomicheskiĭ Zhurnal, 2016, Vol. 42, No. 1, pp. 46–59.
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Izmailov, I.S., Roshchina, E.A., Kiselev, A.A. et al. Photographic observations of visual double stars at Pulkovo: Digitization, measurement, and calibration. Astron. Lett. 42, 41–54 (2016). https://doi.org/10.1134/S1063773715120051
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DOI: https://doi.org/10.1134/S1063773715120051