PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM OBJECT = TEXT INTERCHANGE_FORMAT = ASCII PUBLICATION_DATE = 2001-09-01 NOTE = "N/A" END_OBJECT = TEXT END 1. Introduction This document provides an overview of the Near Earth Asteroid Rendezvous X-Ray Level 2 Observation Log archive. These documents describe the systems that were used to command and control the spacecraft during times when XGRS was controlling attitude, as well as commands that were used to configure the instrumentation during the orbital encounter. 2. Directory Contents Three types of files are included in this directory: a. XGRS_COMMAND_DESC.* Describes the Observation Log macro names and configuration parameters. b. XGRS_INST_USER_GUIDE4* Commanding and CAS generation for instrument and commanding of spacecraft. Lists formats and other higher level issues for team members to build instrument control macros. c. XGRS_OBSLOG* Actual Observation Log of dates and times of command macros that were executed by the spacecraft and instrument systems. Also included are label files for each file type. 3. Cognizant Persons NEAR/XRS data were provided by Jacob Trombka, NEAR XGRS Team Leader: Jacob Trombka Building 2, Rm# 165 Code 691, Astrochemistry Branch NASA/Goddard Space Flight Center Greenbelt, MD 20771. jack.trombka@gsfc.nasa.gov 301-286-5941 This volume was designed and produced by: Tim McClanahan Building 2, # 166 Code 691, Astrochemistry Branch NASA/ Goddard Space Flight Center Greenbelt, MD 20771