PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM LABEL_REVISION_NOTE = " 2008-10-17 GEO:slavney Draft; 2009-01-28 LCROSS:ennico Revised; 2009-05-15 LCROSS:shirley Revised; 2010-03-22 LCROSS:shirley Revised." OBJECT = DATA_SET DATA_SET_ID = "LCROSS-E/L-VSP-3-CAL-V1.0" OBJECT = DATA_SET_MISSION MISSION_NAME = "LUNAR CRATER OBSERVATION AND SENSING SATELLITE" END_OBJECT = DATA_SET_MISSION OBJECT = DATA_SET_INFORMATION DATA_SET_NAME = "LCROSS EARTH/MOON VISIBLE SPECTROMETER 3 CAL V1.0" DATA_SET_COLLECTION_MEMBER_FLG = "N" DATA_OBJECT_TYPE = SPECTRUM START_TIME = 2009-06-20T02:00:00 STOP_TIME = 2009-10-09T11:36:00 DATA_SET_RELEASE_DATE = 2010-03-17 PRODUCER_FULL_NAME = "ANTHONY COLAPRETE" DETAILED_CATALOG_FLAG = "N" ARCHIVE_STATUS = "ARCHIVED" DATA_SET_TERSE_DESC = "Calibrated spectra from the Visible Spectrometer (VSP) aboard the Lunar Crater Observation and Sensing Satellite (LCROSS)." CITATION_DESC = "Colaprete, A., Lunar Crater Observation and Sensing Satellite Visible Spectrometer Calibrated Data V1.0, LCROSS-E/L-VSP-3-CAL-V1.0, NASA Planetary Data System, 2010." ABSTRACT_DESC = "This data set contains calibrated spectra from the Visible Spectrometer (VSP) aboard the Lunar Crater Observation and Sensing Satellite (LCROSS). This instrument's boresight was parallel to the payload reference boresight (Near Infrared Spectrometer #1). After the centaur impact, the spacecraft kept the impact site within the field of view of this instrument until shortly before its own impact." DATA_SET_DESC = " Data Set Overview ================= This data set contains calibrated spectra from the LCROSS Visible Spectrometer (VSP). This instrument's boresight was parallel to the payload reference boresight (Near Infrared Spectrometer #1). After the centaur impact, the spacecraft kept the impact site within the field of view of this instrument until shortly before its own impact. Each file in this dataset contains a 1024 pixel spectra in an ascii, single-column, tabular format. Integration time varied and is noted in the labels. The spectrometer's field of view was circular and 1 degree in diameter. The spectra in this dataset have targets named Moon, Earth and Calibration (i.e., not targeted). The time each spectra was captured is encoded in the spectra's filename like this: LCROSS_VSP_CAL_.IMG where = YYYYMMDDHHMMSSmmm and YYYY = the four digit year; MM = the two digit month, DD = the two digit day, and so on through hours, minutes, seconds and milliseconds. The detached label for each spectra has the same filename as the spectra but with the 'LBL' extension. This dataset encompasses all calibrated spectra collected by the VSP during the mission. Note that the archive's DATA directory is partitioned initially by payload data collection period. The data collection period called 20091009113022_IMPACT contains the data from one minute prior to the Centaur impact through the end of the mission. Other data collection periods periods contain data from various calibration targets. Related Data Sets ================= The VSP_RAW dataset contains the raw versions of the spectra in this dataset. Parameters ========== Science ------- Integration time varies between spectra and is noted in milliseconds by the EXPOSURE_DURATION attribute in the label files. Housekeeping ------------ Instrument temperature at the data collection time is reported in the label file under: INSTRUMENT_TEMPERATURE and INSTRUMENT_TEMPERATURE_COUNT in degrees Centigrade and raw counts, respectively. This is a single telemetry point most representative of the instrument chassis temperature. The thermoelectric cooler control setpoint and best-estimate detector temperature temperature are noted in degrees centigrade in the LCROSS:TEC_SETPOINT and LCROSS:TEC_TEMPERATURE attributes, respectively. The VSP implemented a 'bracket' exposure mode intended to vary the integration time to compensate for uncertainty about the expected scene. In this mode, the spectrometer captured three spectra in quick succession with short, medium and long integration times. Other than integration time, no other aspect of data collection was changed. This aspect of VSP data collection is visible in the LCROSS:VSP_BRACKET_NUMBER and LCROSS:PACKET_TIMESTAMP attributes, which allow PDS-formatted spectra to be tracked back to the slot in the telemetry packet they were created from. Processing ========== Each visible and ultraviolet light spectra was digitally transmitted from the spectrometer to the spacecraft with error detection, inserted into a packet uncompressed and downlinked in telemetry. On the ground, the spectra were extracted from telemetry and converted to CSV format. The LCROSS Make Archive program read these files, applied a per-pixel calibration function and wrote them as PDS-formatted (.TAB) and label (.LBL) files. Data ==== The files in this dataset are PDS-formatted, ascii, single-column tables with detached label files. Each table contains 1024 rows. The 20 non-spectral pixels have not been given calibrated values and their values are not present in these files. Their values are available in the raw spectra files. Coordinate System ================= TBD Software ======== The GSEOS Version used to generate these spectra is GSEOS 5.2.407 (Feb 25, 2008), Python 2.2.3 (#37, Nov 28, 2003, 04:20:20), Project Version 6.1.064. The LCROSS.py Python script used with GSEOS is Version Jun 11, 2008. The LCROSS Report Generator used on GSEOS created CCSDS.dat files is version 114. The version of Satellite Toolkit used to prepare geometric information for the labels is 8.1.3. The LCROSS Make Archive program used to assemble the PDS-formatted submission is dated 03/14/2010. " CONFIDENCE_LEVEL_NOTE = " Confidence Level Overview ========================= The confidence level is unspecified. Review ====== This LCROSS data set was reviewed internally by the LCROSS science team before delivery to PDS. This data set has passed a PDS peer review. Data Coverage and Quality ========================= This data path from spectrometer to PDS involved no lossy compression and was fully error corrected. No VSP packets were lost in downlink. During the preimpact and impact data collection periods, the VSP was miscommanded due to delays associated with an overloaded science computer (DHU). This resulted in some spectra with integration times different from those intended. Also, in the case of 10 out of 1873 spectra, the reported integration times were incorrect, and these times have been corrected. After correction, the integration times in the label files reflect what actually occurred. Some VSP spectra were saturated. These are flagged in the label files by the LCROSS:SATURATION_FLAG attribute. Limitations =========== Noted under data coverage and quality. Data Compression =============== No data compression was used in the datapath from the detector to the formatted files ready for submission to the PDS. " END_OBJECT = DATA_SET_INFORMATION OBJECT = DATA_SET_TARGET TARGET_NAME = EARTH END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_TARGET TARGET_NAME = MOON END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_TARGET TARGET_NAME = CALIBRATION END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_HOST INSTRUMENT_HOST_ID = "LCROSS" INSTRUMENT_ID = "VSP" END_OBJECT = DATA_SET_HOST OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "ANDREWS2006" END_OBJECT = DATA_SET_REFERENCE_INFORMATION END_OBJECT = DATA_SET END