Date: 22.01.2020., 15:00

Sign up for the seminar

1. Report by Buriev A.M. (IA AS RT) “Report by Buriev A.M. (IA AS RT) “Investigation of the dynamics and physical properties of  a sample of comets and asteroids by the optical  observations data” 

The results of investigation of the dynamical and physical properties of a sample of short-period comets and near-Earth’s asteroids performed using optical multicolor observations in the astronomical observatories of the Institute of Astrophysics, Tajikistan Academy of Sciences, will be presented. The astrometric and photometric reduction of observation data was improved by adaptation and introducing software package Apex II, the obtained results have show sufficient precision in determination of the coordinates and brightness of objects. 

Outburst of the comet 17P brightness as a result of splitting of the nucleus was registered in 2007, the moment of fragmentation and the velocity of debris expansion were determined; it was shown that most probable reason of the splitting is an impact. The dynamical and physical features of comet 41P found from observations confirm it relationship to the Kuiper belt objects. The dynamical and physical properties of comet 29P, the morphology and discovery of dust structures in the cometary coma from observations are certainly consistent to active objects of the Centaurs group.
The coordinates of potentially hazardous asteroids 2014 JO25 and 2007 WV4 were determined by their quasi synchronous observations, and using obtained accurate positions the orbits were calculated. The initial orbit of asteroid 2014 JO25 was improved and, as a result, the orbit close to the MPC data was obtained. It is shown that the precision of astrometric measurements allows determining the orbits of asteroids with minimal errors. The physical properties of asteroids were determined; objects’ mineralogy was proposed using found color indexes and known taxonomy.

2. Report by Prof. Kleimenov V.V., Vozmischeva I. Yu., Dr. Novikova E. V. (VKA named after A. F. Mozhaysky) “Definition of restrictions of laser guide star application in ground-based optical telescopes”

In the report the basic characteristics of astronomical ground-based optical telescopes of supervision over natural and artificial space objects, are resulted. Existing very large telescopes (VLT) with diameter of the aperture 6-10 m, and under construction extremely large telescopes (ELT) with the aperture in diameter of 30-39 m are considered.
The role of sodium laser guide star for elimination of phase distortions of images of space objects is shown.Restrictions of application of a laser guide star in ground-based optical telescopes are resulted.