Qudratillo Yuldoshev
@astrin.uz
Laboratory of Galatical astronomy
Ulugh Beg Astronomical Institute of the Uzbekistan Academy of Sciences
RESEARCH, TEACHING, or OTHER INTERESTS
Astronomy and Astrophysics
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Ehgamberdiev Shuhrat Abdumannapovich, Yuldoshev Qudratillo Khabibullaevich, Turaev Sobir Jurakobilovich, Jianhai Zhao, Meiting Yang, Zhenghong Tang, and Yong Yu
SAGE Publications
This paper discusses a photographic plate archive of the Ulugh Beg Astronomical Institute (UBAI) of the Uzbek Academy of Sciences, the history of photometric observations, the current state of photometric plates, and the process of their digitization. We will talk about telescopes used for observations, their characteristics and observations. In addition, we will also talk about the preparation of photographic plates for scanning. Also, the work carried out in the “UBAI-SHAO scientific and technical project” on digitization of photographic plates in the UBAI archive at the Shanghai Astronomical Observatory (SHAO) of the Chinese Academy of Sciences and future work will be reviewed and discussed.
Zhou Fan, Gang Zhao, Wei Wang, Jie Zheng, Jingkun Zhao, Chun Li, Yuqin Chen, Haibo Yuan, Haining Li, Kefeng Tan,et al.
American Astronomical Society
Abstract The Stellar Abundances and Galactic Evolution Survey (SAGES) of the northern sky is a specifically designed multiband photometric survey aiming to provide reliable stellar parameters with accuracy comparable to those from low-resolution optical spectra. It was carried out with the 2.3 m Bok telescope of Steward Observatory and three other telescopes. The observations in the u s and v s passband produced over 36,092 frames of images in total, covering a sky area of ∼9960 deg2. The median survey completenesses of all observing fields for the two bands are u s = 20.4 mag and v s = 20.3 mag, respectively, while the limiting magnitudes with signal-to-noise ratio of 100 are u s ∼ 17 mag and v s ∼ 18 mag, correspondingly. We combined our catalog with the data release 1 (DR1) of the first Panoramic Survey Telescope And Rapid Response System (Pan-STARRS, PS1) catalog, and obtained a total of 48,553,987 sources that have at least one photometric measurement in each of the SAGES u s and v s and PS1 grizy passbands. This is the DR1 of SAGES, released in this paper. We compared our gri point-source photometry with those of PS1 and found an rms scatter of ∼2% difference between PS1 and SAGES for the same band. We estimated an internal photometric precision of SAGES to be of the order of ∼1%. Astrometric precision is better than 0.″2 based on comparison with DR1 of the Gaia mission. In this paper, we also describe the final end-user database, and provide some science applications.
L.L. Wang, Y. Yu, Q.X. Yuldoshev, Sh.A. Ehgamberdiev, Z.J. Shang, M.T. Yang, J. Yang, S. Dong, D.M. Da, Z.H. Tang,et al.
Elsevier BV
Q. Yuldoshev, Y. Protsyuk, H. Relke, S. Ehgamberdiev, M. Muminov, and V. Andruk
Wiley
AbstractWe present a catalog of stars with equatorial coordinates α and δ and B‐magnitudes of stars for the Kitab's section of the FON project (FON‐Kitab). The photographic plates of the FON project were exposed on the double telescope Double Zeiss Astrograph (DAZ, D/F = 40/300, 69″/mm) at the Kitab observatory of the Republic of Uzbekistan. A total of 1963 plates, with size of 5.5 × 5.5 degrees (30 × 30 cm or 13,000 × 13,000 pixels) were digitized by Epson Expression 10000XL scanner with 1,200 dpi resolution. The reduction of plates was processed in the four astronomical organizations: Ulugh Beg Astronomical Institute (UBAI) of the Uzbek Academy of Sciences; the Mykolaiv Astronomical Observatory of the Ministry of Education and Science of Ukraine; the Walter Hohmann Observatory of Essen, Germany; and the Main Astronomical Observatory of the National Academy of Sciences of Ukraine. The catalogue contains nearly 13.4 million stars and galaxies from 0° to −20° according to declination down to B = 17. m5 in the middle epoch of observation 1985.0. The coordinates of the stars and galaxies were obtained from the Tycho‐2 catalogue, while B‐magnitudes were determined in the system of photoelectric standards. The mean internal errors of the new catalogue for all objects were σαδ = 0. ′′23 and σB = 0. m15 (for the stars in the range of B = 5m − 14m, the errors are σαδ = 0. ′′085 and σB = 0. m054 for the equatorial coordinates and the B‐magnitudes, respectively). The convergence between the calculated and reference positions was σαδ = 0. ′′042. The convergence with the photoelectric B‐magnitudes is σB = 0. m16. External comparison with UCAC‐4 based on 9,892,697 or 73.8% cross‐identified objects yield σαδ = 0. ′′26.
Q. X. Yuldoshev, Sh. A. Ehgamberdiev, M. M. Muminov, Yu. I. Protsyuk, H. Relke, and V. M. Andruk
Allerton Press
Yu.I. Protsyuk, , O.E. Kovylianska, S.V. Protsyuk, O.M. Yizhakevych, V.M. Andruk, V.V. Golovnia, Q.K. Yuldoshev, , ,et al.
National Academy of Sciences of Ukraine (Co. LTD Ukrinformnauka) (Publications)
V.M. Andruk, , L.K. Pakuliak, V.V. Golovnia, S.V. Shatokhina, O.M. Yizhakevych, Yu.I. Protsyuk, I. Eglitis, M. Eglite, L.V. Kazantseva,et al.
National Academy of Sciences of Ukraine (Co. LTD Ukrinformnauka) (Publications)
This paper discusses the issues of characteristic curve restoration for astronegatives exposed in the wide range of expositions in U, B Johnson color bands using different telescopes. Photographic plates are digitized by Epson commercial scanners. Digitized images are processed in MIDAS/ROMAFOT software. The accuracy of characteristic curve restoration using photoelectric data is within the range 0,1—0,2 m .