Search Publications
Simulation of Water Vapor Photodissociation during Dust Storm Season on Mars
Medvedev, A. S.; Rodin, A. V.; Shaposhnikov, D. S.
Within the framework of this work, using a three-dimensional numerical model of the general circulation of the Martian atmosphere MAOAM (Martian Atmosphere: Observation and Modeling), also known as MPI-MGCM (Max Planck Institute Martian General Circulation Model), we simulated the planet's hydrological cycle during the 28 and 34 Martian years (MY2…
Transport Characteristics of the Near-Surface Layer of the Nucleus of Comet 67P/Churyumov-Gerasimenko
Blum, J.; Agarwal, J.; Rezac, L. +4 more
The paper considers the free molecular flow of gas through the dusty porous surface layer of a comet nucleus. The study is based on computer models of generation of a porous medium and Knudsen gas diffusion. We consider various types of homogeneous and heterogeneous layers constructed from nonintersecting spheres, including layers that contain mic…
Chemical and Isotope Composition of Comet 67P/Churyumov-Gerasimenko: The Rosetta-Philae Mission Results Reviewed in the Context of Cosmogony and Cosmochemistry
Dorofeeva, V. A.
The studies of the composition and structure of comet 67P/Churyumov-Gerasimenko—a short-period comet of Jupiter's family—which was an object of the recent Rosetta-Philae space mission, yielded results unique in many respects, since it was the first time that a comet was investigated in situ for a long stretch of time under varying conditions of in…
Digitization of Astronegatives of the Pulkovo Glass Library: Positions of Saturn's Major Satellites in the Period 1972-1982 in the Gaia DR2 System
Izmailov, I. S.; Vasil'eva, T. A.; Khovrichev, M. Yu. +3 more
We present the results of the re-reduction of Pulkovo photographic plates with images of Saturn's major satellites in the Gaia DR2 catalog system (169 plates, 3007 individual positions). Astronegatives were taken with the 26-inch refractor at the Pulkovo Observatory between 1972 and 1982. The intrinsic accuracy of measurement of astronegatives usi…
Prospects of Ground-Based and Orbital Studies of Comets and Meteors in the Post-Rosetta Mission Era
Sachkov, M. E.
In this paper, we review the current state and prospects of comet and meteor studies. Special attention is paid to scientific tasks that should be solved with a help of space missions.
Results of Astrometric Observations of Distant Satellites of Jupiter with the New Telescope of the Caucasian Mountain Observatory, Sternberg Astronomical Institute, Moscow State University
Emelyanov, N. V.; Safonov, B. S.; Vozyakova, O. V. +1 more
Replenishment of the database of observations of distant satellites of planets is always useful, since the accuracy of the motion models and ephemeris depends not only on the accuracy of observations. Accuracy improves with increasing observation time. Therefore, observations made even with the same accuracy are in demand. Astrometric observations…
Spatial and Genetic Relationships of Groove Belts, Rift Zones, and Lobate Plains on Venus
Guseva, E. N.
Relationships of two types of extensional zones formed on the surface of Venus in different periods of geologic history—older groove belts and younger rift zones—have been analyzed. Rift zones are less abundant by area than groove belts on the surface of Venus. They are systematically more extensive than groove belts and characterized by contrast …
Astrometric Observations of the Galilean Moons of Jupiter at the Pulkovo Normal Astrograph in 2016-2017
Khovrichev, M. Yu.; Narizhnaya, N. V.; Apetyan, A. A. +6 more
We present the results of observations of the Galilean moons of Jupiter carried out at the Normal Astrograph of the Pulkovo Observatory in 2016-2017. We obtained 761 positions of the Galilean moons of Jupiter in the system of the Gaia DR1 catalog (ICRF, J2000.0) and 854 differential coordinates of the satellites relative to each other. The mean er…
Dynamics of Dust Particles of Different Structure: Application to the Modeling of Dust Motion in the Vicinity of the Nucleus of Comet 67P/Churyumov-Gerasimenko
Hartogh, P.; Rezac, L.; Lacerda, P. +2 more
We consider the estimates of the main forces acting on dust particles near a cometary nucleus. On the basis of these estimates, the motion of dust particles of different structure and mass is analyzed. We consider the following forces: (1) the cometary nucleus gravity, (2) the solar radiation pressure, and (3) the drag on dust particles by a flow …
Dynamics and Origin of Comets: New Problems Appeared after the Rosetta Space Mission
Emel'yanenko, V. V.
The data obtained in the recent Rosetta space mission to comet 67P/Churyumov-Gerasimenko have had a profound impact on the understanding of the nature of comets. In addition to revising the notions on the physical properties and structure of comets, this addresses dynamical aspects of the formation of the observed cometary populations (short- and …