000168270 001__ 168270
000168270 005__ 20260130164313.0
000168270 0247_ $$2doi$$a10.1051/0004-6361/202557978
000168270 0248_ $$2sideral$$a147766
000168270 037__ $$aART-2026-147766
000168270 041__ $$aeng
000168270 100__ $$ade Almeida, A.K.
000168270 245__ $$aA generalized dipole-segment model for the gravitational field of elongated bodies
000168270 260__ $$c2026
000168270 5203_ $$aVarious simplified models have been investigated to understand the complex dynamical environment near irregular asteroids.
We propose a generalized dipole-segment model (GDSM) to describe the gravitational fields of elongated bodies. The proposed model extends the dipole-segment model (DSM) by including variable pole masses and a connecting rod while also accounting for the spheroidal shape of the poles instead of assuming point masses.
A nonlinear optimization method was employed to determine the model parameters, which minimizes the errors between the equilibrium points predicted by the GDSM and those obtained using a more realistic approach, such as the polyhedron model, which is assumed to provide the accurate values of the system. The model was applied to three real irregular bodies: the Kuiper belt objects Arrokoth, Kleopatra, and comet 103P/Hartley.
The results show that the GDSM represents the gravitational field more accurately than the DSM and significantly reduces computational time and effort when compared with the polyhedron model. This reduction in computational complexity does not come at the cost of efficiency. This makes the GDSM a valuable tool for practical applications. The model was further employed to compute heteroclinic orbits that connect the unstable triangular equilibrium points of the system. These trajectories, obtained from the intersections of the stable and unstable manifolds, represent natural pathways that enable transfers between equilibrium regions without continuous propulsion. The results for Arrokoth, Kleopatra, and 103P/Hartley are consistent and validate the GDSM as an accurate and computationally efficient framework for studying the dynamical environment and transfer mechanisms around irregular small bodies.
000168270 540__ $$9info:eu-repo/semantics/closedAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/
000168270 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/acceptedVersion
000168270 700__ $$aFerreira, A.F.S.
000168270 700__ $$aSantos, L.B.T.
000168270 700__ $$aMonteiro, F.
000168270 700__ $$aAmarante, A.
000168270 700__ $$0(orcid)0000-0003-4859-7224$$aTresaco, E.$$uUniversidad de Zaragoza
000168270 700__ $$aSanchez, D.M.
000168270 700__ $$aGomes, C.
000168270 700__ $$aPrado, A.F.B.
000168270 7102_ $$12005$$2595$$aUniversidad de Zaragoza$$bDpto. Matemática Aplicada$$cÁrea Matemática Aplicada
000168270 773__ $$g(2026), [11 pp.]$$pAstron. astrophys.$$tAstronomy and Astrophysics$$x0004-6361
000168270 8564_ $$s17456989$$uhttps://zaguan.unizar.es/record/168270/files/texto_completo.pdf$$yPostprint
000168270 8564_ $$s2796479$$uhttps://zaguan.unizar.es/record/168270/files/texto_completo.jpg?subformat=icon$$xicon$$yPostprint
000168270 909CO $$ooai:zaguan.unizar.es:168270$$particulos$$pdriver
000168270 951__ $$a2026-01-30-14:51:21
000168270 980__ $$aARTICLE