The REgolith X-Ray Imaging Spectrometer (REXIS) for OSIRIS-REx: identifying regional elemental enrichment on asteroids

Conference object, Preprint English OPEN
Allen, Branden T ; Grindlay, Jonathan E. ; Hong, Jaesub ; Binzel, Richard P. ; Masterson, Rebecca ; Inamdar, Niraj K. ; Chodas, Mark ; Smith, Matthew W. ; Bautz, Marshall W. ; Kissel, Steven E. ; Villasenor, Joel ; Oprescu, Miruna ; Induni, Nicholas Mayne (2013)
  • Publisher: Society of Photo-optical Instrumentation Engineers (SPIE)
  • Related identifiers: doi: 10.1117/12.2041715
  • Subject: luminescence | sensors | Spectrometers | Astrophysics - Instrumentation and Methods for Astrophysics | X-Ray imaging | X-rays | equipment and services | Telescope | charge-coupled devices | coded apertures | collimators

The OSIRIS-REx Mission was selected under the NASA New Frontiers program and is scheduled for launch in September of 2016 for a rendezvous with, and collection of a sample from the surface of asteroid Bennu in 2019. 101955 Bennu (previously 1999 RQ36) is an Apollo (near-Earth) asteroid originally discovered by the LINEAR project in 1999 which has since been classified as a potentially hazardous near-Earth object. The REgolith X-Ray Imaging Spectrometer (REXIS) was proposed jointly by MIT and Harvard and was subsequently accepted as a student led instrument for the determination of the elemental composition of the asteroid's surface as well as the surface distribution of select elements through solar induced X-ray fluorescence. REXIS consists of a detector plane that contains 4 X-ray CCDs integrated into a wide field coded aperture telescope with a focal length of 20 em for the detection of regions with enhanced abundance in key elements at 50 m scales. Elemental surface distributions of approximately 50-200 m scales can be detected using the instrument as a simple collimator. An overview of the observation strategy of the REXIS instrument and expected performance are presented here.
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