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In this work, we focused on observations of six trans-Neptunian objects(TNOs) whose apparent magnitudes are brighter than 20 mag. We present theresults of astrometric and photometric observations of (134340) Pluto, (136108)Haumea, (136472) Makemake, (136199) Eris, (90482) Orcus and (20000) Varunaobtained at the Kyiv comet station (Code MPC 585) in 2017-2019. Forobservations, we used the 0.7-m reflector AZT-8 with the FLI PL4710 CCD cameraand filters of the Johnson-Cousins photometric system. From our images, wemeasured the objects astrometric positions, calculated apparent magnitudes inthe BVRI (mostly R) bands using the aperture photometry method, and found theabsolute magnitudes together with the colour indices in several bands.Analysing our results, we investigate the limitation on the astrometry andphotometry of faint objects with the 0.7-m telescope.

Astrometric and photometric observations of six brightest trans-Neptunian objects at the Kyiv comet station