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Документ Application of photometry to understand the behaviour of geostationary objects on orbit(Одеський національний університет імені І. І. Мечникова, 2021) Sukhov, Petro P.; Yepishev, V. P.; Motrunich, I. I.; Sukhov, K. P.; Сухов, Петро Петрович; Сухов, Петр ПетровичOne of the challenges of satellite characterization is the ability to not only determine the spacecraft orbit, but also ssatellite operating status, orientation, size, bus type, and material properties. Positional observations allow us to determine and/or update orbital elements of satellites, but they do not afford an insight into the behaviour of a satellite in orbit. The article discusses the results of solving the inverse problem of astrophysics. How you can use photometric, astrometric information about a satellite, its lighting conditions, supplemented by additional information, to understand the behavior of a satellite in orbit. The results are shown using examples of four satellites in geostationary orbit. An algorithm for calculating the photometric and dynamic characteristics of geostationary objects is provided.Документ Degradation of the reflectance properties of some GSS in space, preliminary results(Одеський національний університет імені І. І. Мечникова, 2020) Sukhov, P. P.; Sukhov, K. P.A spacecraft in near-Earth orbit is exposed to extreme environmental factors, such as high vacuum, zero gravity, collisions with meteors and orbital debris, corpuscular and electromagnetic radiations, etc. These factors result in changing properties of spacecraft surfaces which leads to changes in mechanical, optical, electrical and physical properties of materials and elements of spacecrafts. This paper presents experimental data obtained from ground-based photometric observations of several geostationary satellites (GSS) built on different types of buses, starting from the beginning of their operational lives and during several years after their launches. It has been experimentally proved that spectral reflectance properties of the satellite surface materials undergo gradual degradation with time of the satellite’s stay in space. Noticeable changes in spectral reflectance properties of GSS make it possible to detect damages to the satellite external payload. Comparison of changes in the reflective characteristics of different platforms over time can show the level of technical and scientific progress of spacecraft designers.Документ Determination degradation of satellite surface optical features by photometric method(Одеський національний університет імені І. І. Мечникова, 2022) Sukhov, P. P.; Yepishev, V. P.; Sukhov, K. P.; Pavlovskyi, Alexei L.; Mamrai, Sergei A.; Сухов, Петро ПетровичA method is described for using photometric data to estimate the reflective properties of a satellite's surface material under conditions of its long stay in space. The technique of multicolour photometric B,V,R observations of several geostationary satellites built on different types of tires is shown, and the results obtained over a period of 3 to 9 years. These are geostationary satellites Astra 2E (on the Eurostar E3000 bus), Azerspace- 2/Intelsat 38 (on the SSL-1300 bus), Sicral 2 (on the Spacebus-4000B2 platform) and Blagovest 11L (the Ekspress-2000 bus). It has been revealed that a pattern of change in the reflectivity of different geostationary satellites is dissimilar. Spacecraft materials used for the surfaces of geostationary satellites manufactured in the second decade of the 21st century are more resistant to the harsh space environment than those used for the satellites built in the late 20th century. We have proposed several ways of improving the method for identifying the spacecraft material type based on multicolour photometric observations. The presented results show that the proposed photometric method works and can be used for detecting spacecraft surface degradation.Документ IDENTIFICATION OF GEOSTATIONARY SATELLITES BY THEIR PHOTOMETRIC AND DYNAMIC FEATURES, SOME PROBLEMS(Astroprint, 2015) Sukhov, P. P.; Sukhov, K. P.It is possible to identify certain characteristics of geostationary satellites by studying their photometry. This paper reviews some of the technical problems and methodologies concerning photometry of satellites, as well as their identification by photometric characteristics. The existing methods of identifying geostationary satellites using photometry are also summarized. The present Database of photometric and dynamic characteristics of the GSS, additional information, simplifying the input of the inverse problem all this allows modern methods to identify unknown GSS with a probability up to 80%.Документ ON THE ADVANTAGES OF PHOTOMETRIC OBSERVATIONS OF THE GEOSTATIONARY SATELLITES AT SMALL PHASE ANGLES(Astroprint, 2014) Sukhov, P. P.; Karpenko, G. F.; Sukhov, K. P.; Epishev, V. P.; Motrunych, I. I.; Kudzej, I.; Dubovsky, P. A.As a rule, to determine photometric and dynamic characteristics of geostationary satellites required for their identification, long-lasting (from a half of the year to one year) photometric observations are needed at GSS different positions relative to the observer. The authors suggest conducting photometric measurements of GSS when they enter and exit the Earth's shadow near equinoxes. On these dates the GSS brightness increases by several magnitudes, so the use of telescopes with a mirror diameter of 50-70 cm can be effective. For shorter periods it is possible to get more information about the reflective properties of the object than during long-term observations at large phase angles. Several examples of photometric and dynamic characteristics of several GSS obtained near equinoxes are presented here.