urn:nasa:pds:context:instrument:ody.hend 1.0 1.15.0.0 Product_Context urn:nasa:pds:context:instrument:grs.ody 2021-06-09 1.0 extracted metadata from PDS3 catalog and modified to comply with PDS4 Information Model urn:nasa:pds:context:instrument_host:spacecraft.ody instrument_to_instrument_host 10.1023/B:SPAC.0000021007.76126.15 Boynton, W., Feldman, W., Mitrofanov, I. et al. (2004) The Mars Odyssey Gamma-Ray Spectrometer Instrument Suite, Space Science Reviews, 110, 37-83. HIGH ENERGY NEUTRON DETECTOR Spectrometer High Energy Neutron The High-Energy Neutron Detector (HEND) is part of he Mars Odyssey Gamma-Ray Spectrometer suite. The chief scientific objectives of the HEND instrument is to map the near surface hydrogen (and, by inference, water) and CO2 abundances and their stratigraphic distributions, and determine their seasonal variations, and to determine the depth of the seasonal polar caps and their variation with time.