Astrometric Observations of the Galilean Moons of Jupiter at the Pulkovo Normal Astrograph in 2016−2017     

N. V. Narizhnaya  M. Yu. Khovrichev  A. A. Apetyan  D. A. Bikulova  A. P. Ershova  I. A. Balyaev  A. M. Kulikova  K. I. Os’kina  L. A. Maksimova 《Solar System Research》2018,52(4):312-319

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 errors in the satellites’ normal places and the corresponding root-mean-square deviations are ε_α = 0.0020′′, ε_δ = 0.0027′′, σ_α = 0.0546′′, and σ_δ = 0.0757′′. The equatorial coordinates of the moons are compared to the motion theories of planets and satellites. On average, the (O–C) residuals in the both coordinates relative to the motion theories are less than 0.031′′. The best agreement with observations is achieved by a combination of the EPM2015 and V. Lainey-V.2.0|V1.1 motion theories, which yields the average (O–C) residuals of approximately 0.02″. Peculiarities in the behavior of the (O–C) residuals and error values in Ganymede have been noticed.  相似文献   

Acceleration of Numerical Integration of the Equations of Motion of Asteroids     

Balyaev  I. A. 《Solar System Research》2020,54(6):557-566

Solar System Research - Finding and studying possible collisions of asteroids approaching the Earth requires a significant amount of computation. This paper describes the R0 program created to...  相似文献   

Searching for Binary Systems Among Nearby Dwarfs Based on Pulkovo Observations and SDSS Data     

M.?Yu.?KhovrichevEmail author  A.?A.?Apetyan  E.?A.?Roshchina  I.?S.?Izmailov  D.?A.?Bikulova  A.?P.?Ershova  I.?A.?Balyaev  A.?M.?Kulikova  V.?V.?Petyur  A.?A.?Shumilov  K.?I.?Os’kina  L.?A.?Maksimova 《Astronomy Letters》2018,44(2):103-118

Our goal is to find previously unknown binary systems among low-mass dwarfs in the solar neighborhood and to test the search technique. The basic ideas are to reveal the images of stars with significant ellipticities and/or asymmetries compared to the background stars on CCD frames and to subsequently determine the spatial parameters of the binary system and the magnitude difference between its components. For its realization we have developed a method based on an image shapelet decomposition. All of the comparatively faint stars with large proper motions (V >13 ^m , μ > 300 mas yr^?1) for which the “duplicate source” flag in the Gaia DR1 catalogue is equal to one have been included in the list of objects for our study. As a result, we have selected 702 stars. To verify our results, we have performed additional observations of 65 stars from this list with the Pulkovo 1-m “Saturn” telescope (2016–2017). We have revealed a total of 138 binary candidates (nine of them from the “Saturn” telescope and SDSS data). Six program stars are known binaries. The images of the primaries of the comparatively wide pairs WDS 14519+5147, WDS 11371+6022, and WDS 15404+2500 are shown to be resolved into components; therefore, we can talk about the detection of triple systems. The angular separation ρ, position angle, and component magnitude difference Δm have been estimated for almost all of the revealed binary systems. For most stars 1.5′′ < ρ < 2.5′′, while Δm <1.5^m.  相似文献   

Possible Collisions and Approaches of Some Dangerous Asteroids with the Earth     

Sokolov  L. L.  Balyaev  I. A.  Kuteeva  G. A.  Petrov  N. A.  Eskin  B. B. 《Solar System Research》2020,54(6):541-549

Solar System Research - In this study, we obtained the characteristics of possible collisions with the Earth for a number of dangerous asteroids: 443104 (2013 XK22), 2015 RN35, 2008 EX5. Most of...  相似文献