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CCD UBV and Gaia DR3 based analysis of NGC 189, NGC 1758 and NGC 7762 open clusters
Bilir, Selçuk; Yontan, Talar; Canbay, Remziye +5 more
This paper presents photometric, astrometric, and kinematic analyses of the open clusters NGC 189, NGC 1758 and NGC 7762 based on CCD UBV photometric and Gaia Data Release 3 (DR3) data. According to membership analyses, we identified 32, 57 and 106 most probable member stars with membership probabilities P ⩾ 0.5 in NGC 189, NGC 1758 and NGC 7762, …
Artificial neural network for star tracker centroid computation
Zapevalin, P. R.; Novoselov, A.; Zharov, V. E.
We propose a unique dataset with star images, their centroids, and a new centroid algorithm based on machine learning, that significantly improves star image centroid performance. The centroid of the star image is the subpixel coordinates on the image plane corresponding to the assumed point source of the light (a star). We have compiled and open-…
Trigonometric parallax discrepancies in space telescopes measurements I: The case of the stellar binary system Hip 84976
Al-Wardat, Mashhoor A.; Hussein, Abdallah M.; Widyan, Hatem +1 more
In addition to the complete set of fundamental parameters of its individual components, we present the solution for the discrepancy between the two main astrometric space telescopes Gaia and Hipparcos, in their measurements of the trigonometric parallax for the stellar binary system Hip 84976. In our analysis of the system, we followed Al-Wardat's…
The first photometric, period variation, and flare activity studies of TIC 24233294: Reviewing with the latest results of well-studied late-type active binaries
Jagirdar, Rukmini; Devarapalli, Shanti Priya; Pothuneni, Ravi Raja +2 more
In the current study, we present the first photometric, period variation, and flaring activity investigations of TIC 24233294. Additionally, we also review and report the flaring activity of five well-studied eclipsing binaries BX Tri, V405 And, GJ 3236, Thor 42, and GU Boo. Using the Transiting Exoplanet Survey Satellite (TESS) data, continuous v…
Photometric and Period Variation study of two contact binaries ASAS J034931-0431.2 and KIC 11413213
Jagirdar, Rukmini; Devarapalli, Shanti Priya; Wakgari, Dereje
We present the first photometric analysis of ASAS J034931-0431.2 and KIC 11413213, two short-period eclipsing contact binaries. Photometric analysis using the Wilson-Devinney method was performed using TESS, Kepler 2, and Gaia DR3 data available. Based on the collected times of minima, period variation studies were carried out and the orbital peri…