PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM SPACECRAFT_NAME = NEAR OBJECT = TEXT PUBLICATION_DATE = 2001-09-27 NOTE = "AAREADME.TXT File for data set: NEAR-A-MAG-3-RDR-CRUISE2-V1.0" END_OBJECT = TEXT END NEAR Mission MAGNETOMETER Data Set ======================================================================== Introduction ============ This document provides an overview of this volume of this Near Earth Asteroid Rendezvous (NEAR) Calibrated Data Set, including a summary of the volume contents. The NEAR Science Data Center (SDC) archives NEAR calibrated science data to the Small Bodies Node (SBN) of the Planetary Data System (PDS), as specified in the NEAR Project Archive Generation, Validation and Transfer Plan (February 1998). NEAR data sets contain data from only one instrument and one mission phase. Mission phases for data sets are defined in the table below. Each data set contains the data from a range of days and all supporting directories. The data sets may span multiple volumes. The GEOMETRY data containing the SPICE ephemerides, attitude and other files are delivered in a separate data set. This data set is a part of the NEAR level 2 data set delivery as described by the NEAR PDS Data Archive Plan. The Plan also describes the higher level data products, which will become separate PDS data sets. Volume Format ============= This volume has been formatted according to the ISO-9660 level 2 Interchange Standard. This volume does not contain any Extended Attribute Records (XAR). Thus, some VAX/VMS users may have problems accessing files on this volume. File Formats ============ All text documents and other meta information files such as descriptions, PDS object definitions and detached PDS labels have a carriage return (ASCII 13) and a line feed character (ASCII 10) at the end of the record. This allows the files to be read by MS-DOS/Windows, Unix, and VMS operating systems. All of the data files are provided as ASCII tables. Volume Contents =============== Files on this volume are organized into a set of subdirectories below the top-level directory. The following table shows the structure of these directories. See the *INFO.TXT files in each directory in each directory for specific information on the files in the directory. Volume directory structure: |-AAREADME.TXT The text version of the AAREADME file. |-ERRATA.TXT Text information describing data errors/anomalies. |-VOLDESC.CAT Description of the contents of this volume. |-BROWSE--- |-CATALOG-- |-DATA----- | |-DOCUMENT-|-MAG_SW- | |-GEOMETRY- |-INDEX---- Directory Name Description ----------------------------- CATALOG Templates for the mission, instrument host, instrument, and data set. BROWSE The BROWSE directory has a structure identical to the data directories on this CD, where each contains plots of NEAR MAG data in NEAR Sun Orbital (NSO)and Eros Body Fixed (EBF) coordinate systems. DATA The data are processed scientific data provided in physical units using the two coordinate systems Near Sun Orbital (NSO) and Eros Body Fixed (EBF). Magnetic field data are provided in plot and ASCII table formats, with ASCII data also providing spacecraft position. In addition to the data files, documentation is available on the calibration and data processing techniques. This data set is archived as a set of CDROM images. DOCUMENT The DOCUMENT directory contains the magnetometer calibration document, a mission overview and a subdirectory containing some magnetometer software used to process the data. The calibration document is available in ASCII, Microsoft Word and rich text formats. The mission overview is available in ASCII and Adobe PDF format. The software subdirectory contains two documents: the first is a colletion of software used by the NEAR Science Data Center and the second is a collection of software used to produce the science data files. GEOMETRY This directory contains only a GEOMINFO.TXT file. A separate GEOMETRY volume contains all of the SPICE kernels in text transfer format for the mission phase and the supporting the supporting documentation. INDEX INDEX TABLES for this CD and the volume set describing times and key data file parameter values. Mission Phase Parameters ---------------------------------------------------------------------- Phase Name Segment Start Year, End Year, Length (days) (Phase Day of Year Day of Year Abbrv) ---------------------------------------------------------------------- CRUISE1 CRU1 1996051 1997175 491 MATHILDE MATH 1997176 1997178 3 CRUISE2 CRU2 1997179 1998022 209 EARTH ERTH 1998023 1998026 4 CRUISE3 CRU3 1998027 1998356 330 EROS/FLY/BY ERFB 1998357 1998357 1 CRUISE4 CRU4 1998358 2000010 383 EROS/ORBIT EROS 2000011 2001043 399 EROS/SURFACE ERSF 2001044 2001059 16 ------------------------------------------------------- Whom to Contact for Information =============================== NEAR Science Data Center Kazue Takahashi The Johns Hopkins University Applied Physics Laboratory 11100 Johns Hopkins Road Laurel MD 20723 Email: kazue.takahashi@jhuapl.edu