1. Measuring the Probabilistic Photometric Redshifts of X-ray Quasars Based on the Quantile Regression of Ensembles of Decision Trees

   • A. V. Meshcheryakov
   • V. V. Glazkova
   • I. V. Mashechkin

   OriginalPaper 26 December 2018 Pages: 735 - 753

2. Fine Structure of the Core of the Blazar OJ 287. III. Polarized Emission

   • L. I. Matveyenko
   • S. S. Sivakon

   OriginalPaper 26 December 2018 Pages: 754 - 768

3. Cosmic Rays and Nonthermal Radiation in Middle-Aged Supernova Remnants

   • V. N. Zirakashvili
   • V. S. Ptuskin

   OriginalPaper 26 December 2018 Pages: 769 - 776

4. Single X-ray Bursts and the Model of a Spreading Layer of Accreting Matter over the Neutron Star Surface

   • S. A. Grebenev
   • I. V. Chelovekov

   OriginalPaper 26 December 2018 Pages: 777 - 781

5. Secular Perion Changes and Fundamental Parameters of Long–Period Cepheids

   • Yu. A. Fadeyev

   OriginalPaper 26 December 2018 Pages: 782 - 786

6. Astrometric Study of Two Multiple Stars: ADS 2668 and ADS 8236

   • O. V. Kiyaeva
   • I. S. Izmailov

   OriginalPaper 26 December 2018 Pages: 787 - 797

7. Results of Photometric and Spectroscopic Observations of the Young Variable Star V730 Cep

   • V. P. Grinin
   • K. A. Antonyuk
   • D. Mkrtichian

   OriginalPaper 26 December 2018 Pages: 798 - 802

8. Quiescent and Active States of V1413 Aql I: Photometric Activity Criterion and the Detection of a Secondary Minimum

   • A. A. Tatarnikova
   • A. M. Tatarnikov
   • G. V. Komissarova

   OriginalPaper 26 December 2018 Pages: 803 - 810