This paper is devoted to the navigation tasks for space robots operating in the neighborhood of unstable libration points of the Earth-Sun system in the near-Earth space. The motion of robot in space is examined under a circular restricted three-body problem. The possibility of a space robot maneuvering in the near-Earth space with return to the neighborhood of a collinear libration point and s...

We present calculations of the Cosmic X-ray background (CXB) reflection by the Earth atmosphere in the 1-1000 keV range and compare it with the reflection by the Moon and the Sun. The calculations use realistic chemical composition of the Earth atmosphere and include all relevant physical processes. An analytic approximation to the Earth X-ray albedo is provided, which should be accurate down t...

Abstract During the course of a typical deep space mission like Mars Earth mission, there exist wide range operating points, due to different changes in geometry that consequently cause link budgets terms received signal and noise power. These include distance range, Sun-Earth-Probe angle, zenith angle atmospheric conditions. The with losses (background noise, pointing losses), lead capacities ...

We present calculations of the auroral radio powers expected from exoplanets with magnetospheres driven by an Earth-like magnetospheric interaction with the solar wind. Specifically, we compute the twin cell-vortical ionospheric flows, currents, and resulting radio powers resulting from a Dungey cycle process driven by dayside and nightside magnetic reconnection, as a function of planetary orbi...

kids.frontiersin.org Of all the questions that science might hope to answer, few excite people more than “is there life on worlds other than our Earth, and, if so, do any alien creatures possess intelligence similar to that of human beings?” But how can we find rocky Earth-like worlds that orbit around stars other than our Sun? Remarkably, the first astronomical evidence that such worlds exist ...

Context. We study two coronal mass ejections (CMEs) observed between April 1 to 2, 2019 by both the inner Wide-Field Imager for Parker Solar Probe (WISPR-I) onboard (PSP) spacecraft (located about 46 and 38 solar radii during this period) heliospheric imager (HI-1) Terrestrial Relations Observatory Ahead (STEREO-A) spacecraft, orbiting Sun at 0.96 au. This is first of CME observations from view...

Optimal low-thrust trajectories for the direct escape from Earth’s sphere of influence, starting Sun-Earth or Earth-Moon L2, are analyzed with an indirect optimization method. The dynamic model considers four-body gravitation and JPL ephemeris; solar radiation pressure is also considered. Specific techniques improvements to method introduced tackle highly chaotic nonlinear dynamics motion close...

Abstract By plotting empirical chemical element abundances on Earth relative to the Sun and normalized silicon versus their first ionization potentials, we confirm existence of a correlation reported earlier. To explain this, develop model based principles statistical physics that predicts differentiated for any planetary body in solar system as function its orbital distance. This simple is suc...

Space weather refers to conditions on the Sun, in the interplanetary space and in the Earth space environment that can influence the performance and reliability of space-borne and ground-based technological systems and can endanger human life or health. Adverse conditions in the space environment can cause disruption of satellite operations, communications, navigation, and electric power distri...

■ The Lincoln Near-Earth Asteroid Research (LINEAR) program, which applies space surveillance technology developed for the U.S. Air Force to discovering asteroids, has been operating for five years. During that time LINEAR has provided almost 65% of the worldwide discovery stream and has now discovered 50% of all known asteroids, including near-earth asteroids whose orbital parameters could all...