“Earth, Moon, and Planets,” an international journal of solar system science, recently published a scientific article by Associate Professor of Astrophysics at the American University of Iraq-Baghdad (AUIB), Ioannis Haranas, and his team.
The article titled, “The Invariance of the Tisserand Parameter in Various Gravitational Theories,” is co-authored by Youssef M. Shehata, Kristin Cobbett, Ioannis Gkigkitzis, Dimitrios Theodore Kalafatis, and Ryan Gauthier. It is a result of a theoretical research project conducted by the team, testing a number of gravitational theories associated with the behavior of comets, and finding that “the Tisserand parameter remains constant over a full orbital revolution (of a comet) in all the different potential resulting from the various theories.” The main finding of the research “fortifies and generalizes the use of Tisserand parameter not only in the case of Newtonian dynamics but also in more extended theories of gravity, thus ensuring its validity in determining the identity of a returning comet.”
The article may be accessed via the following link: https://doi.org/10.1007/s11038-023-09551-3