Published in Astrophysics and Space Science
To measure the spin period of the white dwarf in V1033 Cas with high precision, we performed extensive photometry. Observations were obtained over 34 nights in 2017. The total duration of the observations was 143 h. We found that the spin period of the white dwarf is equal to 563.11633±0.00010s\documentclass[12pt]{minimal} \usepackage{amsmath} \use...
Published in Astrophysics and Space Science
Based on the plasma expansion model, the mapping of ionospheric electrostatic potential (field) is derived at the first moments of sunrise and for different seasons, near auroral low latitude regions. For that purpose we considered an ionospheric altitude where one ion species is dominant which is O+\documentclass[12pt]{minimal} \usepackage{amsmath...
Published in Astrophysics and Space Science
Intense turbulence is frequently observed in the polar mesosphere summer echoes (PMSE) from the data of very high frequency radar operating at Esrange, Sweden. The turbulence can be estimated from the turbulent energy dissipation rate (ϵ\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb...
Published in Astrophysics and Space Science
In a novel approach for solving the equations of the Circular Restricted Three-Body Problem (CR3BP) first formulated in Ershkov (Acta Mech. 228(7):2719–2723, 2017a), we apply in this communication a procedure for solving the Euler-Poisson equations for the momentum equations of the CR3BP near the libration points for uniformly rotating planets havi...
Published in Astrophysics and Space Science
A method for calculating the minimum distance between two almost overlapping elliptical orbits is proposed. An expression is obtained for the longitude of the minimum distance point as a function of the orbital elements. Applications are considered of the method for determining the age of pairs of asteroids in close-by orbits.
Published in Astrophysics and Space Science
In this paper, we examine static cylindrical symmetric fluid in unimodular f(R)\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$f(R)$\end{document} gravity. Unimodularity...
Published in Astrophysics and Space Science
A series of astronomical observations obtained over the period 1986 to 2018 supports the idea that life is a cosmic rather than a purely terrestrial or planetary phenomenon. These include (1) the detection of biologically relevant molecules in interstellar clouds and in comets, (2) mid-infrared spectra of interstellar grains and the dust from comet...
Published in Astrophysics and Space Science
We investigate young type Ia supernova remnants (SNRs) in our Galaxy and neighbouring galaxies in order to understand their properties and early stage of their evolution. Here we present a radio continuum study based on new and archival data from the Australia Telescope Compact Array (ATCA) towards N 103B, a young (≤1000 yrs) spectroscopically conf...
Published in Astrophysics and Space Science
The ionization heights of meteor trails are strongly dependent on local atmospheric conditions in the mesosphere and lower thermosphere (MLT)-region. We present here latitudinal difference in ionization heights of meteor trails at two distinct latitudes, Thumba (8.5∘N, 77∘E), India and Eureka (80∘N, 85.8∘W), Canada. There is a large seasonal variat...
Published in Astrophysics and Space Science
Changchun Observatory tracked Space Debris since Feb. 2014. This paper presents the technologies and results of Changchun station for space debris laser ranging (DLR) system. The system operates with a laser of 60 mJ/10 ns/500 [email protected] nm laser and an optical camera for closed-loop tracking. Target selection assistant was introduced to DLR system. To...
