Publications (9)
Nonconservative extension of Keplerian integrals and a new class of integrable system
Javier Roa
The invariance of the Lagrangian under time translations and rotations in Kepler's problem yields the conservation laws related to the energy and angular momentum. Noether's theore…
A novel approach to asteroid impact monitoring and hazard assessment
Javier Roa, Davide Farnocchia, Steven R. Chesley
Orbit-determination programs find the orbit solution that best fits a set of observations by minimizing the RMS of the residuals of the fit. For near-Earth asteroids, the uncertain…
Stability of exomoons around the Kepler transiting circumbinary planets
Adrian S. Hamers, Maxwell X. Cai, Javier Roa +1
The Kepler mission has detected a number of transiting circumbinary planets (CBPs). Although currently not detected, exomoons could be orbiting some of these CBPs, and they might b…
Optical imaging for the Spitzer Survey of Stellar Structure in Galaxies. Data release and notes on interacting galaxies
Johan H. Knapen, Santiago Erroz-Ferrer, Javier Roa +4
(Abridged) The Spitzer Survey for Stellar Structure in Galaxies (S4G) and its more recently approved extension will lead to a set of 3.6 and 4.5 micron images for 2829 galaxies, wh…
Uniform formulation for orbit computation: the intermediate elements
Giulio Baù, Javier Roa
We present a new method for computing orbits in the perturbed two-body problem: the position and velocity vectors of the propagated object in Cartesian coordinates are replaced by…
Stability and chaos in Kustaanheimo-Stiefel space induced by the Hopf fibration
Javier Roa, Hodei Urrutxua, Jesús Peláez
The need for the extra dimension in Kustaanheimo-Stiefel (KS) regularization is explained by the topology of the Hopf fibration, which defines the geometry and structure of KS spac…