Principal algorithms for the control of Kourovka Observatory SBG camera

We report the algorithms used in the software of the upgraded SBG camera. Fast-moving satellites are observed in the "rotated" coordinate system where one of the axes points towards the pole of the object's orbit. The ephemeris for this coordinate system is computed based on the ephemeris for the equatorial coordinate system using special transition matrices. The parameters of the matrices are the coordinates of the orbital pole, which are found by averaging the vector products of the radius vectors of the consecutive positions of the satellite. The position angle of the image is computed as the difference between the hour angles of the orbital and celestial poles in the coordinate system, the pole of which coincides with the optical center of the frame. The speed of object tracking is computed via quadratic interpolation of the ephemeris in the "rotated" coordinate system. © 2012 Pleiades Publishing, Ltd

SBG camera of Kourovka Astronomical observatory

The set-up and principle of operation of the systems of the SBG telescope, which was upgraded in 2005-2006 at the Kourovka Astronomical observatory, are described in detail. The reduction of the field of view (photographic plates replaced by a CCD) is compensated by an increased operation speed, achieved by automating both the telescope drives and image processing procedure. © 2012 Pleiades Publishing, Ltd

Light pressure effect on the orbital evolution of objects moving in the neighborhood of low-order resonances

The hardware-software complex of the SBG telescope of the Kourovka astronomical observatory of the Ural Federal University is described. The area-to-mass ratio of high-orbit objects was estimated from the results of positional observations at the SBG telescope. Positions and sizes of resonance zones are determined from the numerical simulation results depending on the area-to-mass ratio in the case of low-order resonances (1 : 1, 1 : 2, and 1 : 3). Secular perturbations of semimajor axes of orbits, caused by the Poynting-Robertson effect, are estimated in the neighborhood of low-order resonance zones at different area-to-mass ratios. © 2012 Pleiades Publishing, Ltd

Dynamical evolution of asteroid pairs on close orbits

We apply Kholshevnikov metrics defined in the space of Keplerian orbits to search for asteroids in close orbits. We showed that the Yarkovsky effect was required to take into account accurately to carry out precise simulation of dynamical evolution of the asteroid pairs. Determination of physical and rotational parameters of asteroids is needed to solve this problem. © International Astronomical Union 2020

TWO-STAGE SURGICAL TREATMENT OF A CHILD OF ONE YEAR FROM CONGENITAL HEART DISEASE AND BILIARY CIRRHOSIS

Aim: Clinical case of successful two-stage surgical treatment of a 1-year-old child with congenital heart disease and biliary cirrhosis is represented in this article. At the first day of life laparotomy was performed because of high intestinal obstruction. Kasai procedure and Roux-en-Y choledochojejunostomy were per- formed on 12th day and at the end of second month of life, respectively. Liver biopsy showed the signs of biliary cirrhosis. At the same time ventricular septal defect and atrial septal defect with pulmonary hyper- tension were diagnosed. The first step of treatment was the surgical septal defects closure. No complications during procedure, cardiopulmonary bypass and post-operative period were registered. There were no nega- tive effects on liver function after cardiac surgery. 11 months later living-donor liver transplantation was performed without any complications. Patient was discharged at 35th post-transplant day with stable graft function