9 citations · 42 across the 10 of their papers we have counts for
11 papers
Assessment of sky brightness in central Portugal: the Dark Sky destination "Aldeias do Xisto" case study
Domingos Barbosa, Dalmiro Maia, Bruno Morgado +5
A combination of remote sensing techniques, open space data and field testing was developed to derive astronomical and meteorological parameters and assess Dark Sky brightness of t…
Designing 3D transfers: application to Earth-Moon
Allan Kardec de Almeida Junior, Timothée Vaillant, João P. F. Agostinho +2
Three dimensional Earth-Moon transfers usually consume more fuel than planar ones, but are needed depending on the latitude of the launch site and the desired inclination of the fi…
Constraining the orbit of the retrograde planet in the Octantis system
Alan Cefali Signor, Alexandre C. M. Correia, Maria Helena Moreira Morais +4
The Octantis system is composed of a compact stellar binary and a retrograde S-type planet orbiting near the edge of stability. Here, we investigate the dynamically viable arch…
A Cloud-native Agile approach to cyber platform prototyping and integration for astronomy: the ENGAGE SKA case
Domingos Barbosa, Diogo Regateiro, João Paulo Barraca +13
The Square Kilometre Array (SKA) Observatory is gearing up the formal construction of its two radio interferometers in Australia and South Africa after the end of design and pre-co…
PASO -- Astronomy and Space Situational Awareness in a Dark Sky Destination
Domingos Barbosa, Bruno Coelho, Miguel Bergano +17
The Pampilhosa da Serra Space Observatory (PASO) is located in the center of the continental Portuguese territory, in the heart of a certified Dark Sky destination by the Starlight…
Theory of Functional Connections and Nelder-Mead optimization methods applied in satellite characterization
Allan Kardec de Almeida Junior, Safwan Aljbaae, Timothée Vaillant +10
The growing population of man-made objects with the build up of mega-constellations not only increases the potential danger to all space vehicles and in-space infrastructures (incl…
Reversible time-step adaptation for the integration of few-body systems
Tjarda C. N. Boekholt, Timothee Vaillant, Alexandre C. M. Correia
The time step criterion plays a crucial role in direct N-body codes. If not chosen carefully, it will cause a secular drift in the energy error. Shared, adaptive time step criteria…
Eviction-like resonances for satellite orbits. Application to Phobos, the main satellite of Mars
Timothée Vaillant, Alexandre C. M. Correia
The motion of a satellite can experience secular resonances between the precession frequencies of its orbit and the mean motion of the host planet around the star. Some of these re…
Dedicated symplectic integrators for rotation motions
J. Laskar, T. Vaillant
We propose to use the properties of the Lie algebra of the angular momentum to build symplectic integrators dedicated to the Hamiltonian of the free rigid body. By introducing a de…
Long-term orbital and rotational motions of Ceres and Vesta
T. Vaillant, J. Laskar, N. Rambaux +1
Context. The dwarf planet Ceres and the asteroid Vesta have been studied by the Dawn space mission. They are the two heaviest bodies of the main asteroid belt and have different ch…
Sampling microcanonical measures of the 2D Euler equations through Creutz's algorithm: a phase transition from disorder to order when energy is increased
Max Potters, Timothee Vaillant, Freddy Bouchet
The 2D Euler equations is the basic example of fluid models for which a microcanical measure can be constructed from first principles. This measure is defined through finite-dimens…