66 citations · 88 across the 6 of their papers we have counts for
6 papers
Estimating the thermally induced acceleration of the New Horizons spacecraft
André G. C. Guerra, Frederico Francisco, Paulo J. S. Gil +1
Residual accelerations due to thermal effects are estimated through a model of the New Horizons spacecraft and a Monte Carlo simulation. We also discuss and estimate the thermal ef…
Comparison of Four Space Propulsion Methods for Reducing Transfer Times of Crewed Mars Mission
A. G. C. Guerra, O. Bertolami, P. J. S. Gil
We assess the possibility of reducing the travel time of a crewed mission to Mars by examining four different propulsion methods and keeping the mass at departure under 2500 tonne,…
The Contribution of Thermal Effects to the Acceleration of the Deep-Space Pioneer Spacecraft
Orfeu Bertolami, Frederico Francisco, Jorge Páramos +1
A method for the computation of the radiative momentum transfer in the Pioneer 10 & 11 spacecraft due to the diffusive and specular components of reflection is presented. The metho…
Testing the Flyby Anomaly with the GNSS Constellation
O. Bertolami, F. Francisco, P. J. S. Gil +1
We propose the concept of a space mission to probe the so called flyby anomaly, an unexpected velocity change experienced by some deep-space probes using earth gravity assists. The…
Probing the Flyby Anomaly with the Galileo Constellation
O. Bertolami, F. Francisco, P. J. S. Gil +1
In the last few years, the so-called flyby anomaly has been widely discussed, but remains still an illusive topic. This is due to the harsh conditions experienced during an Earth f…
Thermal Analysis of the Pioneer Anomaly: A method to estimate radiative momentum transfer
Orfeu Bertolami, Frederico Francisco, Paulo J. S. Gil +1
We present a methodology based on point-like Lambertian sources that enables one to perform a reliable and comprehensive estimate of the overall thermally induced acceleration of t…