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Gaia Data Release 3: Distribution of Spectral Groups of Near-Earth Asteroids
Kovaleva, D. A.; Shcherbina, M. P.; Shustov, B. M.
Based on the data from the third edition of the Gaia catalog, containing the reflectance spectra of asteroids, studies of near-Earth asteroids (NEAs) were carried out. The reflectance spectra of about 100 representatives of the Aten, Apollo and Amor groups were used to determine their spectral class. For 47 asteroids such an assessment was made fo…
Calculation of the Non-Gravitational A2 Parameter Using Ground-Based Observations of the Apparent Close Approaches between Near-Earth Asteroids and Gaia Stars
Gorshanov, D. L.; Khovrichev, M. Yu.; Bikulova, D. A.
The Yarkovsky effect is one of the noticeable factors in the orbital evolution of near-Earth asteroids (NEAs). The A2 non-gravitational parameter describes the corresponding acceleration in the NEA motion model. This parameter can be derived from astrometric observations of the NEA. We present the results of astrometric observations of …
Features of Designing a Star Catalog for Orientation Sensors of Space Vehicles
Avanesov, G. A.; Elyashev, Ya. D.
A brief history of the creation of star orientation sensors at the Space Research Institute of the Russian Academy of Sciences (IKI RAS) and star catalogs for them is presented. An experiment carried out in the early 1970s on synchronous photography of stars and the Earth's surface from the manned stations Salyut-2 and -3 is described. The difficu…
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…
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…
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…