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Observations of NEO and Main Belt asteroids in 2018-2021 using the Baldone Schmidt telescope

Eglitis, I.; Bule, A.; Sokolova, A. +1 more

During 2018–2021 in the Baldone observatory, 49 new asteroids were discovered and more than 6000 astrometric positions for 1122 asteroids were published in MPC circulars. In this period in 221 observation nights, 5544 CCD images were obtained, which covered 648 square degrees of sky. Of them, about 1000 CCD images were devoted to studying the dyna…

Orbits of 47 dwarf satellite galaxies of the Milky Way in three models of the gravitational potential with different masses

Bobylev, V. V.; Bajkova, A. T.

The analysis of the orbits of 47 dwarf satellite galaxies of the Milky Way, built using three models of the galactic gravitational potential with different masses, is presented. The models of the galactic potential were chosen based on the analysis of a large number of the Galaxy mass estimates known from the literature. The astrometric data neede…

Comprehensive list of semi-detached double-lined eclipsing binaries with Gaia DR2 data

Malkov, O. Yu.

Semi-detached eclipsing systems play an important role in our understanding of stellar properties. In the present study, we have cross-matched a previously compiled comprehensive list of SD double-lined eclipsing binaries, containing 119 systems, with Gaia DR2, and analyze the result. A special analysis is conducted for systems with controversial …

Investigation of relative motion in the triple system ADS 48 on the basis of Gaia DR2 and Pulkovo 26-inch refractor observations

Zhuchkov, R. Ya.; Kiyaeva, O. V.; Izmailov, I. S.

There are high-precision positions, proper motions, parallaxes and radial velocities at the instant 2015.5 for all three components of the star ADS 48 ABF in the catalog Gaia DR2 (2018). According to these data relative motions and the family of orbits were calculated by the Apparent Motion Parameters (AMP) method (Kiselev and Kiyaeva,1980), and t…

Flares activity of selected stars from GTSh10 catalog by CRTS data

Gorbachev, M. A.; Shlyapnikov, A. A.

Based on the database of photometric observations of the CRTS project over an interval of more than 9 years, the activity of red dwarfs from the GTSh10 catalog was analyzed. The total number of analyzed objects, a list ares, amplitudes and moments of recorded events are presented. For the most interesting objects, from the point of view are activi…

Refined proper motions of some high-velocity stars

Dambis, A. K.; Rastorguev, A. S.; Zhuiko, S. V.

We improve the Gaia DR2 proper motions of nine high-velocity stars with the highest proper-motion errors. We reduce the transversal-velocity errors for our stars from to 1.5-746 km/s. We combine our refined proper motions with published radial-velocity and distance data to compute the orbits of these stars in terms of the axisymmetric potential mo…