Data Set Overview :  This data set contains raw mask data from Near Infrared Spectrometer #2 on the LCROSS spacecraft from which full-resolution, hadamard-mode spectra can be assembled. The dataset contains one table per data collection period. Each table contains one row per full-resolution, Hadamard spectrum captured during that collection period. Each row contains a timestamp and 256 values corresponding to 256 distinct configurations of the MEMS mask within the spectrometer.  Conversion of raw mask data into raw spectra is deterministic and involves no calibration inputs. However, this form of the data makes some attributes more apparent. In particular, the check for saturation is done on this form.  The timestamp used in each row of these tables is the uncorrected spacecraft time which appears in the labels for the raw and calibrated spectra as the SPACECRAFT_CLOCK_STOP_COUNT attribute.  This dataset encompasses all pre-hadamard mask data collected by NSP2 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 :  This dataset is closely related to the NSP2_RAW and NSP2_CAL datasets.  Parameters :  Science -------  No instrument parameters vary within this dataset. The integration time is uniformly 0.5 seconds.  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.  Processing :  Each near-infrared spectra was digitally transmitted from the spectrometer to the spacecraft in its raw format, inserted into a packet uncompressed and downlinked in telemetry. On the ground, the spectra were extracted from telemetry, and they were converted to CSV format. For each data collection period, the LCROSS Make Archive program read these files and wrote them as a PDS-formatted table (.TAB) and label (.LBL) file.  Data :  The files in this dataset are PDS-formatted, ascii, single-column tables with detached label files.  Coordinate System :  The label files for these spectra contain the spectrometer's boresight vector in J2000 Geocentric Inertial frame.  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 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 NSP2 packets were lost in downlink. No NSP2 spectra were saturated.  Limitations :  At low signal to noise ratios, detector noise in the pre-hadamard data can result in negative raw counts for some pixels. These values are not physical but are effectively a feature of the internally-performed dark subtraction inherent in this spectrometer's design.  Data Compression :  No data compression was used in the datapath from the detector to the formatted files ready for submission to the PDS.