Resumen:

The hypothesis of the existence of a planet with a high eccentricity, not yet discovered, beyond the orbit of Neptune (called Planet 9), was developed to explain a series of anomalous dynamic behaviors in objects transneptunians (TNOs), such as the existence of objects grouped in their perihelion longitude, the distance of their perihelions from the Neptune region, or the existence of objects with a high inclination. In this work, using semi-analytic models, we study the secular and resonant effects of the hypothetical Planet 9. It is presented under what conditions and due to which of the two dynamics studied one would expect to find TNOs with high inclination and with accumulation of the perihelion longitude in certain directions. The characteristics of the resonances generated by planet 9, the zones where they interact with Neptune’s resonances, and the generation of chaotic zones are presented. Finally, the results of secular evolution within the resonances generated by Planet 9 are presented.

Resumen:

Galactic open clusters are ideal labs to explore and test stellar and dynamical astrophysical models in order to gain a broad outlook on the properties of the Milky Way. Now, the high quality astrometric and photometric information from the Gaia Data Release 3 catalogue allows us to further search for new stellar members in the clusters, which can be used to update their kinematic and stellar properties. The amount of Gaia data requires machine learning algorithms to be handled to retrieve patterns and characteristics. Our goal is to carry out a star membership study in three nearby open clusters: Pleiades, Praesepe and Blanco 1, employing an astrometric model with proper motions and an unsupervised clustering machine learning algorithm using positions, proper motions and parallaxes. The star members are selected from the cross-matching between both methods. We obtained catalogues of star members, and updated kinematic and stellar parameters for these open clusters.

Resumen:

FRIPON (https://www.fripon.org) is an acronym for Fireball Recovery and Inter-Planetary Observation Network. It is an efficient ground-based network of more than a hundred all-sky cameras mainly installed in France and dedicated to the observation of fireballs to characterize the extra-terrestrial matter falling on Earth, and determining the impact area for facilitating the recovery of freshly fallen meteorites. This network started in France in 2016 and has been extended first to Europe and Canada and more recently to Chile (https://www.fcla.cl/fripon-chile) for filling in the gap in the detection of these events in the southern skies and thereby obtaining an exhaustive view of fireball activity. In this talk, we will first introduce the FRIPON network with a special focus on its recent extension in Chile as well as a short report of the first detections we obtained from the southern hemisphere. Then we will emphasize the necessity of extending the network to the surrounding countries of Chile for increasing the probability of meteorite recovery after meteor detection by the network.