Registration Number
0226U002307,
(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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Метод уточнення орбітальних прогнозів.Дослідження вмісту елементів у цефеїд І типу
Head
Koshkin Mykola I., к.ф.-м.н.
Registration Date
13-02-2026
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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Observations of low-orbit reference objects obtained in the period from 2024 to 2025 on the KT-50 telescope (Odesa) were compared with high-precision orbital ephemerides (the declared accuracy of the orbital forecast of which is better than 10 cm). It was shown that the average displacement of the observed measurements of angular coordinates in one pass of the reference satellites does not exceed 0.3 arcsec, which is equivalent to the accuracy of satellite position in orbit better than 3 meters, which allows for the refinement of the observation point coordinates with a similar error.
The enrichment of disk stars with elements of the 1st and 2nd peaks of slow neutron capture, the so-called s-process, was studied, based on a sample of 150 giant stars of the Galactic disk. Spectra of stars were used, obtained using the 1.93-m telescope of the Observatory of Haute-Provence (France) and the ELODIE Echelle spectrograph, covering the wavelength range of 4400–6800 Å with a resolution of R = 42000 and a SNR of 130 to 230 at 5500 Å. The element abundance of the first (Sr, Y, Zr) and second (Ba, La, Ce) peaks of the s-process was obtained by the synthetic spectrum method. The obtained data are compared with models of Galactic chemical evolution.
The distribution of chemical elements Iron, Oxygen and Sulfur in disk of the Galaxy was investigated. For this purpose, high-quality spectra of 51 supergiant stars were used, which were obtained on the CFHT (Hawaii) and VLT (ESO, Chile) telescopes. To determine the O and S abundance in the atmosphere of each star, for calculations without the LTE assumption our own atomic models were used. The distances of the stars from the center of the Galaxy were specified according to the Gaia mission database. It was shown that at the galactic disk periphery the distributions of these elements demonstrate a significant smoothing. It begins close to the Perseus galactic arm and extends further to the Outer Arm and the Norma-Centaurus arm.
Product Description
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Tamara Mishenina
Sergiy M. Andrievsky
Nikolay I. Koshkin
Leonid S. Shakun
Olena O. Korobeynikova
Svitlana L. Strakhova
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2026-02-13
