Перегляд за Автор "Koshkin, Nikolay I."
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Документ Analysis of near-earth resident space objects visibility conditions from optical ground stations(2019) Shakun, Leonid S.; Korobeinikova, E. A.; Koshkin, Nikolay I.; Kozhukhov, O.; Kozhukhov, D.; Piskun, O.; Strakhova, Svitlana I.; Кошкін, Микола Іванович; Кошкин, Николай ИвановичThe continuous monitoring of space object positions in near-Earth space is necessary for tasks of: -the collision prevention of an active satellite with other satellites or space debris objects; -the cleaning Near-Earth space from inactive satellites and space debris; -the planning of new satellite launches.Документ ATLAS of light curves of space objects(2018) Koshkin, Nikolay I.; Кошкин, Николай Иванович; Кошкін, Микола ІвановичATLAS of light curves of space objectsДокумент Atlas of light curves of space objects(2016) Koshkin, Nikolay I.; Кошкін, Микола Іванович; Кошкин, Николай ИвановичДокумент ATLAS of light curves of space objects(2021) Koshkin, Nikolay I.; Shakun, Leonid S.; Korobeinikova, E. A.; Strakhova, S. L.; Melikyants, S. M.; Terpan, S. S.; Golubovskaya, T. A.; Dragomiretsky, V. V.; Ryabov, A. V.; Кошкін, Микола Іванович; Кошкин, Николай ИвановичДокумент Atmosphere drag properties of satellite under influence of "space weather"(Odessa I.I. Mechnikov National University, 2009) Koshkin, Nikolay I.; Korobeynikova, E. A.; Riabov, Mykhailo I.; Strakhova, Svitlana I.; Sukharev, Artem L.; Кошкин, Николай Иванович; Кошкін, Микола ІвановичДокумент Determination of the rotation parameters of reference artificial satellite AJISAI and synchronization of the photometric channels(Astroprint, 2010) Koshkin, Nikolay I.; Korobeinikova, E. A.; Strakhova, S. L.; Shakun, Leonid S.; Lopachenko, V. V.; Кошкин, Николай Иванович; Кошкін, Микола ІвановичThe aim of the present study is to obtain the adjusted current coordinates of the rotation pole of artificial satellite Ajisai and the up-to-date sidereal period of its rotation. To do that, the light curves obtained in Odessa during 2009-2010 are considered. Using both the Ajisai pole’s coordinates and the reduced null point of the hardware-based time scale, has made it possible to improve the timing of the observed flashes of its brightness. By the accurate timing of the simultaneous photometric observations of Ajisai satellite the photometric channels synchronization at the stations in Odessa and Eupatoria is accomplished. The further photometric observations of that satellite are necessary to construct a theory of its rotation about the centre of mass; that will allow of its using as a reference source of the time-calibrated optical signals for any ground-based observatories.Документ Influence of space weather effects on the upper atmosphere according to the drag of artificial earth satellites(Astroprint, 2014) Komendant, V. H.; Koshkin, Nikolay I.; Ryabov, Myhaylo I.; Sukharev, A. L.; Кошкин, Николай Иванович; Кошкін, Микола ІвановичThe applying of the method of timefrequency analysis allows to reveal the detailed structure of the manifestations of the influence of the space weather's state on the upper atmosphere of the Earth. The sensitive indicator of such changes are low-orbit satellites. The drag dynamics of five low–orbit satellites was viewed as indicators manifestations of the influence of space weather on the Earth upper atmosphere. The study period includes phases of decay and a long minimum of 23-rd solar cycle, phases of growth and maximum of 24-th solar cycle. In drag dynamics of all the analyzed satellites strongly marked regular drag effects with long periods (2-4 years) and short-period effects with periods less than one year. The satellites with orbital inclinations close to the equator shows periods with trend from 25 days to 1,3 monthsДокумент Monitoring of space debris rotation based on photometry(Одеський національний університет імені І. І. Мечникова, 2018) Koshkin, Nikolay I.; Shakun, Leonid S.; Korobeinikova, E. A.; Melikyants, S. M.; Strakhova, S. L.; Dragomiretsky, V. V.; Ryabov, A. V.; Golubovskaya, T. A.; Terpan, S. S.; Кошкин, Николай Иванович; Кошкін, Микола ІвановичThe number of spacecraft and space debris (SD) in orbit has become so great that there is a real threat to flight safety. The task of precision calculation of the upcoming positions of any space objects (SO) in orbit in order to predict dangerous mutual approaches and to solve practical tasks has become topical. For the development of a modern orbit propagation model and the associated unified forecast of the evolution of orientation and rotation of an uncontrolled satellite, it is necessary to rely on long-term series of high-quality measurements and their analysis. At present, the direction of research on determining the state of SO rotation around a center of mass has become more and more developed. In our work, we analyze the results of photometric observations of several large objects of space debris obtained at the Astronomical Observatory of Odessa University using the KT-50 telescope during the last six years or more. The results of the evolution of the rotation rate and orientation of the Topex/Poseidon, Envisat, Oicets, Cosmos-2487 (Kondor- E) and Sich-2 satellites are presented.Документ Monitoring of space objects using Odessa Observatory network of telescope(2019) Andrievsky, Serhii M.; Bazyey, N. V.; Zhukov, V. V.; Koshkin, Nikolay I.; Kashuba, V. I.; Kashuba, S. V.; Gorbanev, Yuriy M.; Sukhov, P. P.; Podlesnyak, S. V.; Udovichenko, S. N.; Keir, L. E.; Андрієвський, Сергій Михайлович; Андриевский, Сергей Михайлович; Кошкін, Микола Іванович; Кошкин, Николай Иванович; Горбаньов, Юрій Михайлович; Горбанёв, Юрий МихайловичIn this paper we are presenting optical telescopes of Astronomical Observatory of I. I. Mechnikov Odessa National University. We are describing technical characteristics and scientific program for each telescope. Here we also present a description of the tools with which the unique collections of astroplates were obtained under the program “The Sky Service”. Odessa Observatory (46°.28 N, 30°.45 E, altitude 64 m, observation code 086) it has several observational stations. Among them: Mayaki (46.39° N, 30°.27 E, altitude 25 m, observation code 583) and Kryzhanovka (46°.37 N, 30°.48 E, altitude 40 m, observation code A85). Both stations have a good geographical location, as well as good astroclimate (up to 200 clear nights or part of the night). Telescopes are equipped with modern CCDs and photometric light detectors. Odessa Observatory has its own mechanical and optical workshops that are used for construction the new telescopes and manufacture and repair other astronomical equipment.Документ Monitoring of the inoperative Envisat satellite’s behaviour(Astroprint, 2013) Shakun, Leonid S.; Koshkin, Nikolay I.; Korobeinikova, E. A.; Melikyants, S. M.; Strakhova, S. L.; Terpan, S. S.; Кошкин, Николай Иванович; Кошкін, Микола ІвановичNew positions data and light curves were received for the inoperative Envisat spacecraft still in orbit. The satellite pole and sidereal rotation period were determined on the base of the photometric data for the period from April to August 2013. The presence of a precession of the Envisat rotation axis was deduced.Документ Monitoring the artificial space objects with Ukrainian network of optical stations(Одеський національний університет імені І. І. Мечникова, 2021) Romanyuk, Ya. O.; Shulga, O. V.; Shakun, Leonid S.; Koshkin, Nikolay I.; Кошкін, Микола Іванович; Кошкин, Николай Иванович; Vovchyk, Ye. B.; Bilinsky, А. І.; Kozyryev, Y. S.; Kulichenko, M. O.; Kriuchkovsky, V. F.; Kashuba, V. I.; Korobeynikova, E. A.; Меlikyants, S. M.; Strakhova, S. L.; Теrpan, S. S.; Golubovskaya, T. A.; Martyniuk-Lototskiy, K. P.; Nogacz, R. T.; Epishev, V. P.; Kudak, V. I.; Neubauer, І. F.; Perig, V. М.; Prysiazhnyi, V. I.; Ozeryan, A. P.; Kozhukhov, O. M.; Kozhukhov, D. M.; Ivaschenko, Yu. M.The article describes the successes and challenges of the Ukrainian network of optical stations (UMOS) in recent years in the field of astrometric observations of artificial space objects both in low-Earth orbit (LEO) and geostationary Earth orbit (GEO). UMOS was established in 2012 as a joint partnership of organizations interested in satellite observations for scientific purposes and practical near Earth space monitoring. The main purpose of the UMOS has been (and still is) to combine scientific and technical means with regular optical (positional and / or non-positional) observation. The short list of equipment of the UMOS members are given in the tables. The programs for observations, used methods and obtained results are described in the paper. In conclusion, the advantages of observations of artificial space objects by means of a network are summarized. The experience of UMOS and main results obtained by UMOS can be considered as the first step to create the SSA system of UkraineДокумент Observations of the mutual phenomena of the Galilean moons in 2009(Astroprint, 2010) Koshkin, Nikolay I.; Korobeinikova, E. A.; Shakun, Leonid S.; Dorokhov, N.; Doan, D.L.; Manh, T.N.; Minh, T.N.; Udovichenko, S. N.; Bondarenko, Yu. N.; Kashuba, V. I.; Klabukova, A.; Кошкин, Николай Иванович; Кошкін, Микола ІвановичThe instrumental and ephemeris preparation for the photometric observations of the mutual phenomena in the system of planetary satellites was conducted within the PHEMU09 project. Several reliable light curves and more than two tens of preparatory photometric observations of various mutual phenomena in the Jovian system were obtained. The observation data were processed, and the moments of the greatest phases of the phenomena were defined. The difference of moments of the observed greatest phases of the phenomena and the ephemerides, computed by the theory of V. Lainey, is about 0.02^0.5 minutes. To construct an improved theory of motion of the Jovian moons, the observations are to be used for the concluding processing in the IMCCE (Institute de Mecanique et de calcul des ephemerides, France) that coordinates the PHEMU09 campaign.Документ Simulation of the orbiting spacecraft to analysis and understand their rotation based on photometry(Одеський національний університет імені І. І. Мечникова, 2019) Koshkin, Nikolay I.; Melikyants, S. M.; Korobeinikova, E. A.; Shakun, Leonid S.; Strakhova, Svitlana I.; Kashuba, V.; Romanyuk, Ya.; Terpan, S. S.; Кошкін, Микола Іванович; Кошкин, Николай Иванович; Шакун, Леонід С.Analysis of the photometric information allows to determine the parameters of spacecraft rotation. We will consider the light curves of a rotating satellite. Smooth changes in brightness, which are caused by diffuse scattering of sunlight, are characterized by the amplitude, quantity, shape and asymmetry of brightness variation during the rotation period of the body. In addition, the so-called “specular” flashes of light of very large amplitude are present on light curves. By analyzing the observed light curves of the inactive satellites Topex/Poseidon and Sich-2, the determination of pole orientation these objects in space is demonstrated. To interpret the light curve's contained information, we are planning to creat optical-geometrical models of this satellite and simulated geometrical conditions by its orbit passages. Further comparison of the model and observed light curves should allow us to confirm the correctness of the satellite attitude determination. For the simulation, we used the MaxScript programming language, which allows to create a satellite model, and simulate the opticalgeometric conditions of its passage, including the complex rotation of the spacecraft.Документ Simultaneous multi-site photometry of Leo Satellites to characterise their rotation states(Одеський національний університет імені І. І. Мечникова, 2020) Koshkin, Nikolay I.; Shakun, L.; Melikyants, S.; Korobeynikova, E.; Strakhova, S.; Bilinsky, A.; Vovchyk, Ye.; Kudak, V.; Motrunich, І.; Neubauer, I.; Kozhukhov, O.; Romanyuk, Ya.; Ryabov, A.; Terpan, S.; Dragomiretsky, V.; Golubovskaya, T.; Кошкін, Микола Іванович; Кошкин, Николай ИвановичThe photometry of space objects (SO) makes it possible to determine their state of rotation around the center of mass, orientation of the rotation axis and rotation speed in the most cost-effective manner. However, the methods for determining the attitude parameters from photometric data from a single observation site (OS) require long series of high-quality and high-frequency measurements. We propose a method for determining the orientation parameters of slowly rotating SO based on simultaneous multi-site photometry with a high temporal resolution. Preconditions for planning and building a local photometric network that can accomplish such a task have been tested via computer simulation. Synchronous observations of the unoperated spacecraft TOPEX/Poseidon were carried out. They were attended by the observatories of Odessa, Lvov and Uzhgorod universities, as well as the observation station of the State Space Agency of Ukraine in Zalistsi, Khmelnytsky region, took part. Synchronous network-based photometric observations from three OSs enable us to calculate time lags between correlated lightcurve segments and promptly determine the direction of rotation, as well as the spatial orientation of a SO’s spin axis and its angular spin rate. A local network of several distributed observation sites for synchronous monitoring of the rotation of various SO in LEO will make it possible to determine the rotation parameters of also slowly rotating objects that do not exhibit glints within their light curves.Документ The change indices of solar and geomagnetic activity and their influence on the dinamics of drag of artificial satellite(Одеський національний університет імені І. І. Мечникова, 2016) Komendant, V. H.; Koshkin, Nikolay I.; Ryabov, Myhaylo I.; Sukharev, A. L.; Кошкин, Николай Иванович; Кошкін, Микола ІвановичThe time-frequency and multiple regression analysis of the orbital parameter characterizing the drag of satellites on circular and elliptical orbits with different perigees and orbital inclinations in the atmosphere of the Earth was being conducted in 23-24 cycles of solar activity. Among the factors influencing braking dynamics of satellites were taken: W – Wolf numbers; Sp – the total area of sunspot groups of the northern and southern hemispheres of the Sun, F10.7 – the solar radio flux at 10,7 cm; E – electron flux with energies more than 0,6 MeV и 2 MeV; planetary, high latitude and middle latitude geomagnetic index Ap. In the atmospheric drag dynamics of satellites, the following periods were detected: 6–year, 2.1–year, annual, semi-annual, 27–days, 13– and 11–days. Similar periods are identified in indexes of solar and geomagnetic activity. Dependence of the periods of satellites motion on extremes of solar activities and space weather conditions was conducted.Документ The observations of artificial satellites and space debris using KT-50 telescope in the Odessa University(Одеський національний університет імені І. І. Мечникова, 2016) Shakun, Leonid S.; Koshkin, Nikolay I.; Korobeinikova, E. A.; Melikyants, S. M.; Strakhova, S. L.; Terpan, S. S.; Burlak, N.; Golubovskaya, T. A.; Dragomiretsky, V. V.; Ryabov, A. V.; Кошкин, Николай Иванович; Кошкін, Микола ІвановичIn paper the equipment, images analysis techniques in the frame and the method of the satellite brightness estimation in the standard photometric system are describes. Within two years, on the KT-50 telescope were obtained measurements of about two hundred objects in more than 2,000 passages. The results of statistical analysis of actual data observations array in 2015 and 2016 are given.Документ The photometric model of artificial satellite AJISAI and determination of its rotation period(Astroprint, 2012) Korobeinikova, E. A.; Koshkin, Nikolay I.; Shakun, Leonid S.; Burlak, N.; Melikyants, S. M.; Terpan, S. S.; Strakhova, S. L.; Кошкин, Николай Иванович; Кошкін, Микола ІвановичABSTRACT. Photometry is used to make remote diagnostics of an artificial satellite’s motion around its centre of mass. Experimental satellite Ajisai was designed to explore the effects of the space factors, such as gravitation and magnetic fields, solar radiation and others, on its orbital motion and rotation. In the present study we consider the use of peculiar light curves of Ajisai, exhibiting a complex sequence of momentary flashes, for precise determination of the rotation period and velocity variations. For the first time, on the basis of the high-speed photometry, the model of placement of mirrors on the satellite’s surface was designed to carry out further analysis of its kinematics.Документ The research of variation of the period and precession of the rotation axis of Egs (Ajisai) satellite by using photometric measurement(Astroprint, 2014) Burlak, N.; Koshkin, Nikolay I.; Korobeinikova, E. A.; Melikyants, S. M.; Shakun, Leonid S.; Strakhova, S. L.; Кошкин, Николай Иванович; Кошкін, Микола ІвановичThe light curves of EGS Ajisai with temporal resolution of 20 ms referred to the time scale UTC (GPS) with an error of at most 0.1 ms were obtained. The observed flashes are produced when the mirrors which cover the spinning satellite’s surface reflect off the sunlight. In previous paper the analysis of sequence of flashes allowed of reconstructing the arrangement and orientation of the mirrors, i.e. developing an optogeometric model of the satellite (Korobeynikova et al., 2012), and to apply that model along with new photometric observations to determine the satellite’s sidereal rotational period with an accuracy that was previously unachievable. A new technique for determination of the spin-axis orientation during each passage of the satellite over an observation site was developed. The secular slowdown of the satellite’s spin rate (Рsid = 1.4858EXP(0.000041099T), where Т is measured in days counted from the date of the satellite launch) and its variations correlating with the average duration of the satellite orbit out of the Earth’s shadow were refined. New parameters of the spin-axis precession were estimated: the period Pprec = 116.44 days, αprec = 18.0h, δprec = 87.66°, the nutation angle θ = 1.78°.Документ The study of indicatrices of space object coatings in a controlled laboratory environment(Одеський національний університет імені І. І. Мечникова, 2015) Koshkin, Nikolay I.; Petrov, M.; Strakhova, S. L.; Кошкин, Николай Иванович; Кошкін, Микола ІвановичThe indicatrices of light scattering by radiation balance coatings used on space objects (SO) were determined in the laboratory experiment in a controlled condition. The laboratory device for the physical simulation of photometric observations of space objects in orbit, which was used in this case to study optical properties of coating samples, is described. The features of light reflection off plane coating samples, including multi-layer insulation (MLI) blankets, metal surfaces coated with several layers of enamel EP-140, special polyacrylate enamel AK-512 and matte finish Tp- CO-2, were determined. The indicated coatings are compound reflectors which exhibit both diffuse and specular reflections. The data obtained are to be used in the development of computer optical-geometric models of space objects or their fragments (space debris) to interpret the photometry results for real space objects.Документ The study of timing relationships which arise when using a television CCD camera Watec WAT-902H2 Supreme in astronomical investigations(Astroprint, 2015) Dragomiretsky, V. V.; Ryabov, A. V.; Koshkin, Nikolay I.; Кошкин, Николай Иванович; Кошкін, Микола ІвановичThe present paper describes the study of timing relationships which arise when using an analogue CCD camera Watec WAT-902H2 Sup in astronomical investigations, particularly in time-domain measurements of LEO satellites which are fast-moving against stellar background.