CAMSS: A spectroscopic survey of meteoroid elemental abundances
Résumé
The main element abundances (Mg, Fe, Na, ...) of some Near Earth Objects can be measured by meteor spectroscopy. The Cameras for All-sky Meteor Surveillance (CAMS) Spectrograph project aims to scale up meteor spectroscopy in the same way as CAMS scaled up the measurement of precise meteoroid trajectories from multistation video observations. Spectra are recorded with sixteen low-light video cameras, each equipped with a high 1379 lines/mm objective transmission grating. The cameras are operated in survey mode and have recorded spectra in the San Francisco Bay Area every clear night since March 12, 2013. An interactive software tool is being developed to calibrate the wavelength alignments projected on the focal plane and extract the meteor spectra. Because the meteoroid trajectory and pre-atmospheric orbit are also independently measured, the absolute abundances of elements in the meteoroid plasma can be calculated as a function of altitude, while the orbital information can tie the meteoroid back to its parent object.
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