Andreev A.O., Nefedyev Yu.A., Demina N.Yu., Kolosov Yu.A., Korchagina E.P. «Multiparametric analysis of celestial bodies as sources of space resources» Научно-технические ведомости Санкт-Петербургского государственного политехнического университета. Физико-математические науки, 16, № S1.2, с. 511-516 (2023)

The work is devoted to the creation of a method based on data from space missions such as LRO (Lunar Reconnaissance Orbiter) and the analysis of possible impactors and meteoroid material for mapping the distribution of minerals on the Moon. In the process of surveys from the Lunar Reconnaissance Orbiter (LRO) spacecraft, the most recent generalized information on the distribution of iron and titanium in the composition of the lunar surface rocks was obtained. To obtain these data, it was necessary to compile a single map from more than 4 thousand images that the LRO spacecraft took during a month of work in a lunar orbit. The processing of the obtained data made it possible to detect areas on the lunar surface containing significant deposits of titanium. The results were calibrated using analyzes of lunar soil samples brought to Earth by the American Apollo missions and Soviet automatic vehicles of the Luna series. Concrete results obtained: Map of mineral distribution gradients depending on selenographic coordinates on the lunar sphere.

Zagidullin A.A., Petrova N.K., Nefedyev Yu.A., Andreev A.O. «Creation of a generalized dynamic model of planetary moons based on an analytical approach for describing the libration processes of their rotation» Научно-технические ведомости Санкт-Петербургского государственного политехнического университета. Физико-математические науки, 16, № S1.2, с. 517-522 (2023)

Our work is devoted to the creation of a generalized dynamic model that describes libration processes in the motion of the natural satellite of the planet, which has been tested on the simulation of the moons rotational parameters(MRPs) of the Earth’s Moon and allows adapting description system of MRPs to other celestial objects, having a librational nature of rotation as well. In this case, it is assumed that an analytical approach was used to describe the rotational motion, which, on the one hand, is rather complicated for solving the equations of rotation and has a lower accuracy than the numerical one, but, on the other hand, the resulting analytical representation of MRPs provides a more convenient tool for analyzing the behavior of MRPs with changes in various parameters, determining the rotational dynamics of the satellite.It is with its help that the procedure of flexible computer simulation of the rotation process and the identification of those observational manifestations, which are determined primarily by the parameters of the figure of a celestial body – the laws of distribution of body mass, compression, non-sphericity.

Sergienko M.V., Sokolova M.G., Nefedyev Yu.A., Andreev A.O. «ρ-Geminids meteor shower and its connection with near-earth asteroids» Научно-технические ведомости Санкт-Петербургского государственного политехнического университета. Физико-математические науки, 16, № S1.2, с. 523-529 (2023)

In this work, genetic connections (GC) of the small meteor shower ρ-Geminids with near-Earth objects (NEOs) of the Apollo group were studied using the author’s multi-parameter method. The multiparameter method for determining GC of meteor showers with probable parent bodies is based on the use of a set of criteria for identifying orbits, such as: D-criterion by Drummond, Kholshevnikov’s metric, Tisserand’s parameter, μ and ν quasi-stationary parameters of the restricted three-body problem, longitude of perihelion π of meteor orbit. The method of identifying meteoroids with asteroids involves computational procedures and the calculation of critical values for each of the criteria used, which increases the reliability of finding the GC for the objects under study. The catalogues of meteor orbits: Meteoroid Orbit Database v3.0, CAMS and EDMOND 5 v.04 of the European Meteor Network were used as source material in the work.

Churkin K.O., Andreev A.O., Nefedyev Yu.A., Kolosov Yu.A., Korchagina E.P., Demina N.Yu., Borovskih V.S. «Analysis of comet C/1969 Y1 parameters using isophote structural modeling» Научно-технические ведомости Санкт-Петербургского государственного политехнического университета. Физико-математические науки, 16, № S1.2, с. 530-535 (2023)

This work is devoted to the construction of a brightness structural model of the long-period comet Bennett C/1969 Y1. This comet belongs to the comets of the Jupiter family (JF) and has a Tisserand’s parameter T>2. Determining the brightness characteristics of the comet has been one of the most important goals of cometary observations over the past century. The complexity of such studies lies in the fact that we are dealing with extended sources moving relative to background stars. The problem of obtaining reliable estimates of the distribution of brightness parameters (BPs) for long-period comets also remains especially important, because for many of them observations were made back in the days when high-precision methods, such as CCD-matrices and other technical tools, were not available. At the same time, most of the determined stellar magnitudes of long-period comets were related to the gaseous coma surrounding the comet’s nucleus, and not to the comet’s nucleus itself. At the same time, cosmic ultraviolet observations of comets in the Lyman-alpha hydrogen lines made it possible to obtain very important data for estimating the emission of H₂O by the cometary nucleus, as well as other types of molecules (e.g. C₂, C₃, CN, OH). In the presence of dependencies between the productivity of the H₂O cometary nucleus and its brightness characteristics, the determination of BPs of cometary nuclei has acquired a new meaning. However, the dependence of the size of the nucleus on its BPs is not linear, since there is a correlation with the albedo of the surface of the nucleus. In this work, BPs and albedo for comet Bennett C/1969 Y1 are studied. Taking into account the data obtained and the solution of the described problems, we applied the author’s isophote method to analyze the structure of the brightness characteristics of Bennett C/1969 Y1.

Nizamov B.A., Pshirkov M.S. «Can observations of 511 keV line from the M31 galaxy shed light on the AGN jet composition?» Письма в Астрономический журнал: Астрономия и космическая физика, 49, № 5, с. 322-323 (2023)

DOI: 10.31857/S0320010823050029