Resonant Orbits in the Problem of Expanding the Reachable Landing Areas on the Surface of Venus

Astronomy Letters - We consider the concept of applying gravity assist maneuvers near Venus using resonant orbits with a period equal to the Venusian one. We show that the proposed operations based...     

On the possibility of the guidance of small asteroids to dangerous celestial bodies using the gravity-assist maneuver

In this paper, the method of changing the trajectories of hazardous asteroids with orbits known for some years to be on a possible collision course with the Earth is considered. The method relies on the use of small asteroids (asteroid-projectiles) directed at hazardous celestial bodies by giving the projectile a sufficiently small velocity impulse ensuring the Earth gravity assist. As a result, the asteroid-projectile vector can be controllably changed over a wide range. Apophis is considered as an example of the target asteroid. The technical feasibility of this method is discussed. It is noted that despite the potential use of this elegant method, its practical implementation requires further research and development.     

Orbital Motion and Attitude Control of the Spectrum–Röntgen–Gamma Space Observatory

Astronomy Letters - The Spectrum–Röntgen–Gamma (SRG) space observatory was launched from Baikonur on July 13, 2019, and is currently on a flight trajectory in the vicinity of the...