Research
Combined Effect of Solar Radiation and Solar Tide Perturbations on the Spacecraft Rosetta about the Comet Wirtanen
The purpose of the present paper is twofold . First, is to give summary on Rosetta spacecraft, the first mission ever to orbit and land on a comet which is Wirtanen comet. The second, which is the most important, is to establish general computational algorithm which could be used for the motion of a spacecraft orbiting about asteroid or comet, taking due account of the combined effect of solar radiation and solar tide. The algorithm was applied for the late stage of Rosetta mission about the Wirtanen comet, staring at 10 June 2011, and the variations of the coordinates and velocities are illustrated graphically in the range f ∈ [0, 2 π].
Computational Algorithm for Gravity Turn Maneuver
In this paper, computational algorithm for gravity turn maneuver is established for variable thrust-to- weight ratio. The applications of the algorithm was illustrated graphically.
Homology Invariant Functions for Lane-Emden Equation of Finite Polytropic Index
The present paper is devoted to establish a general Mathematica module to determine if a function is homology invariant or not. The module is described through its basic points, propose, input, output and computational steps. Applications of the module are also given.
