DAWN GRAND MAP VESTA NEUTRON ABSORPTION V1.0

A global map of a unitless compositional parameter, delta-C_perpendicular (DCP), and propagated 1-sigma uncertainties is provided. DCP varies linearly with the macroscopic thermal neutron absorption cross section of Vesta's regolith. An equation for converting tabulated DCP values to absorption units is provided in this document. DCP was determined from thermal and epithermal neutron counting rates measured by the NASA Dawn mission's Gamma Ray and Neutron Detector (GRaND) while in low altitude mapping orbit, about 210 km from Vesta's surface. The measurements are representative of Vesta's bulk regolith composition to depths of a few decimeters with a spatial resolution of about 300-km full-width-at-half-maximum of arc length on the surface. The methods used to determine neutron absorption are described by PRETTYMANETAL2013.

Data and Resources

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Additional Info

Field	Value
Maintainer	Thomas Morgan
Last Updated	July 17, 2025, 13:54 (UTC)
Created	March 31, 2025, 12:30 (UTC)
accessLevel	public
accrualPeriodicity	irregular
bureauCode	{026:00}
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harvest_object_id	339296d1-8152-4ccd-85e2-0da171212f88
harvest_source_id	61638e72-b36c-4866-9d28-551a3062f158
harvest_source_title	DNG Legacy Data
identifier	urn:nasa:pds:context_pds3:data_set:data_set.dawn-a-grand-5-vesta-absorption-v1.0_2dei-g79b
issued	2018-06-26
landingPage	https://pds.nasa.gov/ds-view/pds/viewDataset.jsp?dsid=DAWN-A-GRAND-5-VESTA-ABSORPTION-V1.0
modified	2023-01-26
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publisher	National Aeronautics and Space Administration
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