PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM ^TEXT = "AAREADME.TXT" OBJECT = TEXT PUBLICATION_DATE = 2016-02-11 NOTE = "AAREADME.TXT describes this volume." END_OBJECT = TEXT END Volume DWNVGRD_1B Dawn GRaND Calibrated Level-1B Vesta Encounter Archive ============================================================================== Brief Disk Description ============================================================================== This volume contains data from the Dawn GRaND calibrated level-1B (RDR) Vesta Encounter dataset. This dataset includes a time-ordered collection of gamma ray and neutron counting data acquired by the GRaND instrument during the Dawn mission Vesta encounter phases: Vesta Approach, Survey, High Altitude Mapping Orbit (HAMO), Low Altitude Mapping Orbit (LAMO), HAMO2 (second HAMO that followed LAMO), and the transfer phases in between. A description of how the GRaND data are organized can be found in the Software Interface Specification (SIS) and Data Processing document (in the DOCUMENT directory) and in Prettyman et al. (2011) Space Science Reviews, Vol. 163(1-4), pp. 371-459, http://dx.doi.org/10.1007/s11214-011-9862-0 NOTE: Reading the Science Plan (DOCUMENTS/SCIENCE_PLAN/DAWN_SCIPLAN_V4_4.PDF) is critical to the understanding of the Vesta observations and science objectives. Other critical documentation in the DOCUMENT directory include the volume SIS, the data processing description, and the pointing geometry discussion. The RDR includes calibrated, time-series spectra and counting rates along with information needed for analysis and mapping. Improved reduction and analyses of gamma ray spectra has enabled the identification of additional elements [Yamashita et al., 2014, 45th Lunar and Planetary Science conference, Abstract 2674] and quantification of global concentrations of K and Th ; Prettyman et al., 2014, 45th Lunar and Planetary Science conference, Abstract 2565]. Energy-calibrated and corrected gamma ray spectra included on this volume support studies to bound and quantify the major elemental constituents of silicate minerals. The RDR data set includes position, pointing, and measurement geometry data that can be used with both the RDR and Experimental Data Records (EDRs) for studies with neutron and gamma ray data. All data are stored in the 'DATA' branch of the directory tree. In addition to the data files, ancillary information is stored in a separate PDS label (.LBL) file. Information about data gaps and other issues affecting the quality of the data can be found in the Confidence Level Note in the data set catalog (grand_l1b_vesta_ds.cat) Users of these data are encouraged to acknowledge both the PDS and the principal investigators of the instruments whose data are used in analysis in all publications. ============================================================================== Volume Set Information ============================================================================== This volume is part of the GRaND calibrated level-1B RDR data volume set. This volume set includes the following volumes: Volume ID Description -------------------------------------------------------- DWNMGRD_1B Dawn GRaND L1-B RDR Mars flyby data DWNVGRD_1B Dawn GRaND L1-B RDR Vesta Encounter data DWNCGRD_1B Dawn GRaND L1-B RDR Ceres Encounter data ============================================================================== Mission Facts ============================================================================== The 'Dawn Vesta Science Phases' table below provides a list of Dawn Vesta Encounter mission phase start dates. ------------------------------------------------------------------------------ Dawn Vesta Science Phases ------------------------------------------------------------------------------ start date (DOY) Phase Name (ID) ------------------------------------------------------------------------------ 2011-05-03 (123) VESTA SCIENCE APPROACH (VSA) 2011-08-11 (223) VESTA SCIENCE SURVEY (VSS) 2011-08-31 (243) VESTA TRANSFER TO HAMO (VTH) 2011-09-29 (272) VESTA SCIENCE HAMO (VSH) 2011-11-02 (306) VESTA TRANSFER TO LAMO (VTL) 2011-12-12 (346) VESTA SCIENCE LAMO (VSL) 2012-05-01 (122) VESTA TRANSFER TO HAMO 2 (VT2) 2012-06-15 (167) VESTA SCIENCE HAMO 2 (VH2) 2012-07-25 (207) VESTA TRANSFER TO CERES (VTC) ------------------------------------------------------------------------------ ============================================================================== File Formats ============================================================================== The data files on this volume are all simple ASCII tables. Each data file has an detached ASCII header (PDS label). The PDS label contains information describing spacecraft, target, and data record format. A data set description, instrument description, and other PDS documents are in .CAT files in the /CATALOG directory. Additional documentation is generally located in the DOCUMENT directory. Note for Windows users: In more recent versions of the Microsoft Windows operating system the .CAT by default is reserved as 'Security Catalog.' The .CAT files contained in this volume are ASCII text files, and can be read by any form of text editor. To make Windows open files with this name extension as text files, do the following. In Windows Explorer, open the 'Tools' menu and select 'Folder Options'. Select the 'File Types' tab and select 'CAT' from the list. Press 'Change...' and then choose your preferred text editor or viewer. We do not know of any harmful effects this might have on the operating system or other programs, but do not guarantee it will be entirely safe to make this change. If problems occur, the change can be undone in the same 'File Types' window by changing the default application back to 'crypto shell extension'. ============================================================================== Errata ============================================================================== Every effort has been made to assure that the data and documentation are of the best possible quality. However, mistakes are inevitable. There is a file called ERRATA.TXT found at the root level of this volume which contains a list of known deficiencies or caveats associated with data on this volume at the time this volume was produced. ============================================================================== Volume Contents and Structure ============================================================================== This section describes the volume structure and naming conventions. Below is a tree diagram of the volume, followed by a description of the directory function and key files in each directory. DWNVGRD_1B (root directory) | |- AAREADME.TXT Describes volume contents, and organization (this file) | |- ERRATA.TXT Describes known deficiencies or caveats in the data or | on this volume. | |- VOLDESC.CAT High level description of volume contents. | |- [BROWSE] Contains plots of the GRaND spectra by sub-phase and | the Vesta mission timeline. | |- [CATALOG] PDS catalog files containing information describing the | data, instrument, instrument personnel, relevant references, | the spacecraft, and mission. A more detailed description of | the contents of this directory is provided in the file | /CATALOG/CATINFO.TXT. | |- [DATA] Contains the time series data files. | |- [DOCUMENT] Contains documents describing the instrument, and data | acquisition, processing, and usage. A more detailed | description of the contents of this directory is provided in | the file /DOCUMENT/DOCINFO.TXT. | |- [EXTRAS] Contains files which facilitate the use of the data on the | disk, but which are not actually required for the use or | understanding of those data. A more detailed description of | the contents of this directory is provided in the file | /EXTRAS/EXTRINFO.TXT. | |- [INDEX] Contains a table of contents for all files located on this | volume, and the volume set to date. A more detailed | description of the contents of this directory is provided in | the file /INDEX/INDXINFO.TXT. ============================================================================ Contacts ============================================================================ This volume was produced for the Planetary Data System (PDS) at the Small Bodies node. The data, and associated metadata were supplied by Dr. Thomas H. Prettyman, of the Planetary Science Institute. The volume was assembled at the Dawn Science Center (DSC), by Joseph N. Mafi. For questions or problems regarding the volume, please contact Dr. Carol Neese at the PDS Small Bodies Node: Email neese@psi.edu Telephone 520-382-0591 Mail Planetary Science Institute 1700 E. Ft. Lowell, Ste. 106 Tucson, AZ 85719-2395 USA For question regarding the data, please contact Dr. Tom Prettyman of PSI: Email prettyman@psi.edu Telephone 520-622-6300 Mail Planetary Science Institute Albuquerque, NM USA For questions regarding PDS Standards or other archives available from the PDS, please contact PDS Operator at the PDS Engineering Node (at JPL): Email pds_operator@jpl.nasa.gov Telephone 818-354-4321 Mail Planetary Data System, PDS Operator Jet Propulsion Laboratory Mail Stop 202-101 4800 Oak Grove Dr. Pasadena, CA 91109-8099 USA The PDS assumes no legal liability for errors on this disk. All users are encouraged to verify the correctness of the data prior to submitting any publications or other work based on these data. Please report errors on this disk to the Small Bodies Node of the PDS through the ERRATA reporting procedures described above.