PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM OBJECT = DATA_SET DATA_SET_ID = "NEAR-A-XRS-3-EDR-EROS/ORBIT-V1.0" OBJECT = DATA_SET_INFORMATION DATA_SET_NAME = "NEAR XRS SPECTRA FOR EROS/ORBIT" DATA_SET_COLLECTION_MEMBER_FLG = "N" DATA_OBJECT_TYPE = SPECTRUM START_TIME = 2000-01-11T18:55:03 STOP_TIME = 2001-02-11T12:00:08 DATA_SET_RELEASE_DATE = 2001-07-15 PRODUCER_FULL_NAME = "JACOB TROMBKA" DETAILED_CATALOG_FLAG = "N" DATA_SET_DESC = " Data Set Overview and Parameters ================================ The XRS Level 2 data products in this archive include daily time series of spectra collected by the instrument along with selected spacecraft engineering and instrument configuration and orbital ephemerides. Supporting documentation includes as to the specifics of how these data were generated. A supporting BROWSE facility was included to facilitate high level overview of asteroid and solar flourescence activity, which is in the form of time and resolution correlated histographic images of flourescence detection by the asteroid and solar pointing detectors. Asteroid surface coverage is included in the form of an image with six orthogonal views of the asteroid of counts collected by the asteroid pointing unfiltered detector. The daily images are integrated through an XRS browser facility XGRSBROWSE.HTML included BROWSE Directory. The XRS Level-3 data products in this archive include the most optimal XRS sampling of flourescence of the asteroid surface during selected solar flares. These data include specific time series of spectra collected by the instrument along with selected spacecraft engineering and instrument configuration and orbital ephemerides. This portion of the data set is identical to the Level-2 format specific to the time of each flare. A second partition of the data set is a derived product in which a composite set of data is generated by summing spectra to increase signal to noise during the flare. Selected ephemerides and engineering parameters are averaged for the composite set of information. Processing ========== The Level 2and 3 data products comprise the time series of the XRS instrument's science data in physical units. At each integration time the instrument Data Processing Unit (DPU) samples instrument spectra accumulated during the integration period as well as instrument and engineering configuration information. Ground processing activities at the University of Arizona produce Derived Engineering and Spatial Ephemerides information. The Level-2/3 data are then combined into integral products within a relational database and exported as an integral Level-2 product. Each XRS record is comprised of the following logical data units: Spectra: 4, (256 Channel) Spectra (UNF, MG, AL, SOL) UNF = Unfiltered: Asteroid Pointing MG = Magnesium: Asteroid Pointing AL = Aluminum: Asteroid Pointing SOL = Solar: Sun Pointing Instrument HouseKeeping: Instrument Rates and activity Engineering Housekeeping: Engineering Configurations (volts, etc.) Derived Engineering: Ground derived data products Spatial Orbital Ephemerides Data and Ancillary Files ======================== Files for Level-2 are organized into a series of time subdirectories below the top-level directory. For level 3 the subdirectories are orgainzed according to the initial onset of a solar event time period. Coordinate System ================= All products were derived in the Asteroid Body Fixed Coordinate System Software ======== These products were derived from a specialized ground processing system developed at the University of Arizona Lunar and Planetary Laboratory. All derived products are described in the DOCUMENT Section of this volume: Requirement Specifications For Level-2 Parameters Required Stored or Derived by The Near Earth Asteroid Rendezvous (NEAR) X-Ray Spectrometer (XRS) Ground System Media ====== This data set is released as a CDROM set." CONFIDENCE_LEVEL_NOTE = " Overview ======== Data in this archive have been reduced as part of mission data analysis activities of the NEAR XGRS Science Team. Data of questionable validity have been omitted from the solutions. Review ====== This archival data set was reviewed by the NEAR XGRS Team prior to submission to the Planetary Data System (PDS). It was one of several data sets included in a comprehensive review by the PDS Small Bodies Node in August 2001, prior to PDS acceptance and ingestion. ========================= The data included in this archive were collected during the NEAR orbital phase from 2000-02-14 to 2001-02-12. Limitations =========== None " END_OBJECT = DATA_SET_INFORMATION OBJECT = DATA_SET_TARGET TARGET_NAME = "EROS" END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_HOST INSTRUMENT_HOST_ID = "NEAR" INSTRUMENT_ID = "XRS" END_OBJECT = DATA_SET_HOST OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "CHENGETAL1998" END_OBJECT = DATA_SET_REFERENCE_INFORMATION END_OBJECT = DATA_SET END