1. Catalog of X-Ray Active Galactic Nuclei Based on ROSAT BSC and FSC Sources

   • G. M. Paronyan
   • A. M. Mickaelian
   • G. A. Mikayelyan

   OriginalPaper 29 September 2021 Pages: 277 - 292

2. Changes in the Period of Negative Superhumps of Type SU UMa Dwarf Novae. II. NY Her (2017 and 2020)

   • E. P. Pavlenko
   • A. A. Sosnovskii
   • A. V. Baklanov

   OriginalPaper 30 September 2021 Pages: 293 - 305

3. Active Stage of the Symbiotic Object MWC 560, 2018-2021

   • L. N. Kondratyeva
   • I. V. Reva
   • M. A. Krugov

   OriginalPaper 29 September 2021 Pages: 306 - 315

4. Ultraviolet Spectral Behavior of UX Ari with Periodic Flaring Activity

   • M. R. Sanad
   • I. Zead
   • M. A. Abdel-Sabour

   OriginalPaper 29 September 2021 Pages: 316 - 326

5. Analysis of Type II and Type III Radio Bursts Associated with SEPs from Non-Interacting/Interacting Radio-Loud CMEs

   • P. Pappa Kalaivani
   • O. Prakash
   • G. Michalek

   OriginalPaper 29 September 2021 Pages: 327 - 344

6. Effect of Continuum Scattering on the Statistical and Temporal Characteristics of Spectral Line Formation

   • A. G. Nikoghossian

   OriginalPaper 29 September 2021 Pages: 345 - 354

7. Dynamics of a Cosmological Model with a Conformally-Coupled Scalar Field

   • R. M. Avagyan
   • G. H. Harutunyan
   • A. A. Saharian

   OriginalPaper 29 September 2021 Pages: 355 - 369

8. Hot Quark Matter with Neutrino Confinement in Terms of the Local Nambu - Jona-Lasinio SU(3) Model

   • G. S. Hajyan
   • G. B. Alaverdyan

   OriginalPaper 29 September 2021 Pages: 370 - 387

9. Sobolev LVG Analysis of Aminomethanol and N-Methylhydroxylamine: Potential Spectral Lines for Their Detection in a Cosmic Object

   • M. K. Sharma
   • S. Chandra

   OriginalPaper 30 September 2021 Pages: 388 - 404

10. Ultraviolet Astronomy: Astrophysical Perspectives of the Spektr-UF Project (WSO-UV)

    • B. M. Shustov

    REVIEWS 30 September 2021 Pages: 405 - 424

11. Correction to: Light Curve Analysis of some Eclipsing Binary Systems

    • M. S. Alenazi
    • M. M. Elkateeb

    Correction 30 September 2021 Pages: 425 - 425

12. Correction to: Modulation of Galactic Cosmic Rays Due to Magnetic Clouds and Associated Structures in the Interplanetary Space: 1996-2018

    • M. Fadaaq
    • B. Badruddin

    Correction 30 September 2021 Pages: 426 - 434