NOAO >   Observing Info >   Approved Programs >   2011A-0046

Small NOAO Logo

Proposal Information for 2011A-0046


PI: Franck Marchis, SETI Institute, fmarchis@seti.org
Address: 515 Whisman N. Rd, Mountain View, CA, 94043, USA

CoI: J. Emilio Enriquez, SETI Institute
CoI: Jerome Berthier, IMCCE
CoI: Pascal Descamps, IMCCE
CoI: Josef Durech, Charles University
CoI: Valery Lainey, IMCCE
CoI: Frederic Vachier, IMCCE

Title: Refining the Mutual Orbits of Known Multiple Asteroid Moonlets

Abstract: We propose to observe 6 known multiple asteroid systems with Gemini/ALTAIR at their opposition to refine the mutual orbits of their satellites. We analyzed and gathered all adaptive optics observations collected over the past 10 years from VLT and Gemini telescopes, plus all Hubble Space Telescope in a database called VOBAD. From 2003-2007 data, we published a preliminary study of 12 multiple asteroid systems assuming Keplerian orbits and derived their mass and average bulk densities. Using a recently developed dynamical model based on genetic algorithm, we will incorporate these new Gemini/ALTAIR astrometric positions (4-6 obs per asteroids) to build a consistent orbital solution for these systems. This large temporal baseline will allow us to detect non-Keplerian perturbations introduced by resonances, estimate the mass of the moonlets, the distribution of material in the interior of the primary bringing the study of these multiple asteroid systems to an exquisite level of details. This work will help understanding the formation of the multiple asteroid systems and to a larger extend of our solar system. Ultimately we will provide ephemeris calculations for these multiple asteroids which could be used as astrometric calibrator for the next generation of adaptive optics systems.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2011A-0046

noaoprop-help@noao.edu

Small NOAO Logo