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Most asteroid discoveries consist of a few astrometric observations over a short time span, and in many cases the amount of information is not enough to compute a full orbit according to the least squares principle. We investigate whether such a Very Short Arc may nonetheless contain significant orbit information, with predictive value, e.g., allowing to(More)
In the next generation surveys, the discovery of moving objects can be successful only if an observation strategy and the identification/orbit determination procedure are appropriate for the diverse apparent motions of the target sub-populations. The observations must accurately measure the displacement over a short interval of time; observations believed(More)
  • A. Milani, M. E. Sansaturio, G. Tommei, O. Arratia
  • 2004
When the astrometric data for an asteroid are insufficient, the orbit solving the least squares problem can be weakly determined or even not computable. Then it is advantageous for most applications to sample the confidence region (where the orbit could be found without contradicting the observations) with multiple solutions, a finite set of Virtual(More)
The opportunistic pathogen Pseudomonas aeruginosa can establish life-long chronic infections in the airways of cystic fibrosis (CF) patients. Persistent lifestyle is established with P. aeruginosa patho-adaptive variants, which are clonal with the initially-acquired strains. Several reports indicated that P. aeruginosa adapts by loss-of-function mutations(More)
When an asteroid is lost, the observers need to know the portion of the celestial sphere where it could be recovered at a given time. This region is an image of the region, in the space of orbital elements, where the orbit is compatible with the previous observations. The map between these two regions is nonlinear, therefore the classical linear(More)
To try to understand the dynamical and collisional evolution of the Hungaria asteroids we have built a large catalog of accurate synthetic proper elements. Using the distribution of the Hungaria, in the spaces of proper elements and of proper frequencies, we can study the dynamical boundaries and the internal structure of the Hungaria region, both within a(More)
Semianalytical averaging is used to compute secular perturbations on the orbits of asteroids and comets; the method is applicable even for planet-crossing orbits. We prove that for every value of the asteroid/comet semimajor axis, and for an arbitrary number of perturbing planets, there is a stable region of orbits free from node crossings; it corresponds(More)
We investigate a method to compute a finite set of preliminary orbits for solar system bodies using the first integrals of the Kepler problem. This method is thought for the applications to the modern sets of astrometric observations, where often the information contained in the observations allows only to compute, by interpolation , two angular positions(More)
The Panoramic Survey Telescope and Rapid Response System (Pan-STARRS) under development at the University of Hawaii's Institute for Astronomy is creating the first fully automated end-to-end Moving Object Processing System (MOPS) in the world. It will be capable of identifying detections of moving objects in our solar system and linking those detections(More)
Errors in the modelling the satellite orbit have so far limited the accuracy in the processing of Satellite Laser Ranging (SLR) data. A new method is proposed to achieve a residual size consistent with the observational errors, and a stability of the geode-tic network coordinates at the same level. The orbit of the geodetic satellite LAGEOS is decomposed(More)