Abstract This paper presents a collection of analytical formulae that can be used in the long-term propagation motion spacecraft subject to low-thrust acceleration and orbital perturbations. The considers accelerations due to: profile following an inverse square law, gravity perturbations central body field third-body gravitational perturbation. are expressed terms non-singular equinoctial elem...

Accelerations and braking of vehicles can be measured and analyzed with different systems and software. In our case, we used the system G-Tech Pro Performance Meter RR w and Performance Analysis System Software (PASS). This system enables measurements of longitudinal accelerations, lateral accelerations and braking. PASS software has two options, the first is Drag Runs, which is designed for th...

In this paper, we present two main results. First, by only one conjecture (Conjecture 2.9) for recognizing a vertex symmetric graph, which is the hardest task for our problem, we construct an algorithm for finding an isomorphism between two graphs in polynomial time O(n). Second, without that conjecture, we prove the algorithm to be of quasi-polynomial time O(n ). The conjectures in this paper ...

People are known to be very poor at visually judging acceleration. Yet, they are extremely proficient at intercepting balls that fall under gravitational acceleration. How is this possible? We previously found that people make systematic errors when trying to tap on targets that move with different constant accelerations or decelerations on interleaved trials. Here, we show that providing conte...

The phenomena customly described with the standard ΛCDM model are broadly reproduced by an extremely simple model in TeVeS, Bekenstein’s (2004) modification of General Relativity motivated by galaxy phenomenology. Our model can account for the acceleration of the universe seen in SNeIa distances without a cosmological constant, and the accelerations seen rotation curves of nearby spiral galaxie...

A fundamental component of the Global Positioning System is the calculation of a highly accurate predicted orbit for each of the constellation spacecraft on a regular basis. In general, the parameters used to describe these orbits are not stable and need to be constantly updated. Being able to predict changes, and also being able to calculate the orbit after the fact, relies upon a combination ...

We present X-ray and weak lensing observations of the merging cluster system 1E0657−556. Due to the recently collision of a merging subcluster with the main cluster, the X-ray plasma has been displaced from the cluster galaxies in both components. The weak lensing data shows that the lensing surface potential is in spatial agreement with the galaxies (∼ 10% of the observed baryons) and not with...

Prevailing views on how we time the interception of a moving object assume that the visual inputs are informationally sufficient to estimate the time-to-contact from the object's kinematics. However, there are limitations in the visual system that raise questions about the general validity of these theories. Most notably, vision is poorly sensitive to arbitrary accelerations. How then does the ...

Newtonian mechanics indicates that galaxies and galaxy clusters are much more massive than we would have guessed from their luminosities, with the discrepancy being generally attributed to dark matter halos. An alternative hypothesis is that accelerations in very weak gravitational fields are larger than predicted by Newton’s laws, and there is no need for dark matter. Even though we do not cur...