Registration Number
0225U002925,
(0124U001030)
, R & D reports
Title
Strategies for the application of astronomy methods for navigation support systems, research of near and far space objects
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Дослідження точності орбітальних прогнозів; отримання та обробка додаткового спектрального і фотометричного матеріалу
Head
Koshkin Mykola I., к.ф.-м.н.
Registration Date
18-04-2025
Organization
Odesa I.I. Mechnikov National University
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The goal is to develop and work out a method for rapid assessment of the coordinates of reference points and moments of time for a navigation network with an accuracy acceptable for many practical (including military) tasks in the absence of access to global navigation networks. All technologies used within the project are either developed in Ukraine or are open and freely available. To expand our knowledge of very small asteroids (VSA, less than 150-200 m in diameter) by determining their physical properties with the help of multi-color photometric observations, to study the final state of the evolution of their spin axes due to the YORP effect, to find opportunities to prevent them from colliding with the Earth. In the field of galaxy research, the task is as follows. 1) Obtain high-quality spectra on distant supergiant stars, which has no analogues in the world yet. For this, we already have an application approved by the CFHT 3.6m telescope committee in Hawaii. 2) Use the obtained spectra for a comprehensive study of star programs and determination of their physical and chemical characteristics. 3) Incorporate the obtained results on the chemical properties of stars into the existing models of the chemical evolution of the Galaxy in order to supplement and improve them
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The accuracy of orbital predictions of the satellites provided by the DORIS and ILRS services was analyzed. Comparison of optical measurements of the coordinates of these satellites obtained on our telescopes (for a large set of passes) with the DORIS orbital predictions show an average deviation of less than 0.1 arcsec. Thus, DORIS predictions can provide an accuracy of determining the station coordinates of about 10m for 1-2 passes of satellite. Comparison of the same observations with ILRS predictions shows a deviations of up to several arcseconds. Spectroscopic material was obtained for selected stars on the Canada-France-Hawaii telescope and part of it was processed. The use of non-LTE analysis made it possible to obtain the abundance of many chemical elements in the atmospheres of two anomalous supergiants. For V708 Car, the abundance of 27 elements for LTE and 8 for non-LTE was determined. Its mass has been determined (12MO) and confirmation of the presence of a circumstellar envelope has been found. The mass of the yellow supergiant V470 Cas is only 4MO. It is located on the blue boundary of the instability band of pulsating supergiants, the so-called Cepheids, although this phase is extremely fleeting. This star is extremely enriched in Lithium, which is not typical of supergiant stars. Observations of potentially hazardous asteroids have been analyzed. From Jul 2022 to Feb 2023, 224 light curves of the binary asteroid (65803) Didymos were obtained on 28 telescopes before and after the collision of the DART spacecraft with its satellite. The light curves of this system have been analyzed to detect occultation and eclipses and study changes in orbital period. A campaign of photometric and spectroscopic observations was conducted during the 0.0263AU approach to Earth of asteroid (4660) Nereus on Dec 11, 2021. Analysis of its light curves allowed us to determine its rotation period, amplitude, phase functions, color indices, diameter, and spectral class.
Product Description
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Andriievskyi Serhii M.
Kovtiukh Valerii V.
Korobeinikova Olena O.
Koshkin Mykola I.
Okhotko Hanna К.
Strakhova Svitlana L.
Troianskyi Volodymyr V.
Shakun Leonid S.
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2025-04-18
