NASA is sending the OSIRIS-REx spacecraft to explore near-Earth asteroid Bennu, a carbon-rich body that may contain clues to the origins of life. When OSIRIS-REx arrives at Bennu in 2018, it will spend over a year orbiting the asteroid and studying it with a suite of remote sensing instruments. The OSIRIS-REx Visible and Infrared Spectrometer, or OVIRS, will look at Bennu's spectral signature to detect organics and other minerals. After OVIRS and its fellow instruments have thoroughly surveyed Bennu, OSIRIS-REx will descend to the asteroid's surface, collect a sample, and return it to Earth in 2023.
GCMD keywords can be found on the Internet with the following citation:
Olsen, L.M., G. Major, K. Shein, J. Scialdone, S. Ritz, T. Stevens, M. Morahan, A. Aleman, R. Vogel, S. Leicester, H. Weir, M. Meaux, S. Grebas, C.Solomon, M. Holland, T. Northcutt, R. A. Restrepo, R. Bilodeau, 2013. NASA/Global Change Master Directory (GCMD) Earth Science Keywords. Version 220.127.116.11.0