Journées Scientifiques de l'Action Thématique GRAM

Session

Mécanique Céleste

27 nov. 2026, 10:00

Amphi Pierre-Gilles de Gennes (Université Paris Cité)

7. Meteor Clusters

Jérémie Vaubaillon (LTE, Observatoire de Paris)

27/11/2026 10:00

Meteors are streaks of light appearing in the sky (a.k.a. shooting stars), produced by the high entry velocity of a meteoroid (rock in the interplanetary space) into our atmosphere. A meteor cluster involves several meteors following the same orbit, appearing at the same time. About 10 have been reported so far, although continuous meteor monitoring has been going on for more than 25 years...

9. The Internation Lunar Reference System ILuRS

27/11/2026 11:00

The ILuRS is the new Moon references system proposed by the IAG/IAU WG 1.1.3 and adopted as a new product center by IERS in May 2026. I will introduce here the concepts and the associated definitions of ILuRs.

8. NAROO program

27/11/2026 11:30

The New Astrometric Reduction of Old Observations (NAROO) program is dedicated to the measurement of astrophotographic plates and the analysis of old observations for scientific purposes. One of the main objectives is to provide accurate positional measurements of planets and satellites to improve our knowledge of their orbits and dynamics, and to infer the accuracy of the planet and satellite...

11. Rotation du satellite géodésique Ajisai : détermination, évolution, applications

27/11/2026 12:00

La connaissance de la rotation des satellites géodésiques est nécessaire ou utile pour de nombreuses applications, par exemple la modélisation de certaines perturbations du mouvement orbital (e.g. l’effet Yarkovsky) ou la synchronisation d’horloges distantes par lien laser via un satellite passif. L’étude de la dynamique de la rotation est également intéressante en soit. Nous avons développé...