J. Lecacheux
A5075459033- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Planetary Science and Exploration
- Geology and Paleoclimatology Research
- Gamma-ray bursts and supernovae
- Geological and Geochemical Analysis
- Astronomy and Astrophysical Research
Université Paris Sciences et Lettres
2023
Université de Versailles Saint-Quentin-en-Yvelines
2023
Sorbonne Université
2023
Observatoire de Paris
2009-2023
Laboratoire d’études spatiales et d’instrumentation en astrophysique
2009-2023
Université Paris Cité
2023
Centre National de la Recherche Scientifique
2023
Sorbonne Paris Cité
2023
Délégation Paris 7
2023
Janssen (France)
2009
After the discovery of rings around largest known Centaur object, (10199) Chariklo, we carried out observation campaigns stellar occultations produced by second-largest (2060) Chiron, to better characterize its physical properties and presence material on surroundings. We predicted successfully observed two Chiron. These observations were used constrain size shape fitting elliptical limbs with equivalent surface radii in agreement radiometric measurements. Constraints Chiron are reported for...
Context. The physical characterization of trans-Neptunian objects is essential for improving our understanding the formation and evolution Solar System. Stellar occultation a ground-based technique that can be successfully used to determine some TNOs’ fundamental properties with high precision, such as size shape. Aims. This work aimed at constraining size, shape, geometric albedo dwarf planet candidate (307261) 2002 MS 4 through analysis nine stellar events. Using multichord detection, we...
CCD photometry of 809 Lundia obtained between September 2005 and January 2006 at Borowiec Pic du Midi Observatories demonstrates that this object is a synchronous binary system with an orbital period 15.418 <i>±<i/> 0.001 h. In paper, we present the results photometric observations from two oppositions in 2005/2006 2007, as well first modelling system. For simplicity assumed fluid-like nature for each component modified Roche model triaxial ellipsoid shape kinematic models. Our models...
Context. Centaurs, distinguished by their volatile-rich compositions, play a pivotal role in understanding the formation and evolution of early Solar System, as they represent remnants primordial material that populated outer regions. Stellar occultations offer means to investigate physical properties, including shape rotational state, potential presence satellites rings. Aims. This work aims conduct detailed study centaur (54598) Bienor through stellar light curves from photometric data...
Centaurs, distinguished by their volatile-rich compositions, play a pivotal role in understanding the formation and evolution of early solar system, as they represent remnants primordial material that populated outer regions. Stellar occultations offer means to investigate physical properties, including shape, rotational state, or potential presence satellites rings. This work aims conduct detailed study centaur (54598) Bienor through stellar light curves from photometric data collected...
Within our program of physical characterization trans-Neptunian objects and centaurs, we predicted a stellar occultation by the centaur (54598) Bienor to occur on January 11, 2019, with good observability potential. We obtained high accuracy astrometric data refine prediction, resulting in shadow path favorable for Iberian Peninsula. This encouraged us carry out an observation campaign that resulted five positive detections from four observing sites. is fourth which multichord (more than two...