CH1ORB-L-SIR2-2-NPO

Contents 1 Data set description 1.1 Data set overview 1.2 Parameters 1.3 Processing 1.4 Data 1.5 Ancillary data 1.6 Coordinate system 1.7 Software 1.8 Media/Format 2 Confidence level note 2.1 Confidence level overview 2.2 Review 2.3 Data quality 2.4 Pointing accuracy 1. Data set description 1.1. Data set overview The data set contains spectra acquired with the SIR2 instrument aboard the CHANDRAYAAN1 spacecraft. SIR2 is a point spectrometer with 256 spectral channels. For details on the SIR2 instrument see the EAICD in the `DOCUMENT directory. 1.2. Parameters The measured parameter is spectral intensity. The unit is data number which has a value between 0 and 65535. 1.3. Processing No processing beyond unpacking has been applied to the telemetry data. 1.4. Data Each data product contains all data from one orbit. The data product may either contain only housekeeping data or housekeeping and science data, i.e., spectra, which is reflected in the filenames, cf. the file `AAREADME.TXT in the root directory. Each data product consists of an ASCII PDS label file and a FITS data file, which is plain ASCII for housekeeping data only or binary if science data is included. The actual data resides in the FITS file, while the label files provides a PDS compliant description of the data structure. The data is arranged in a PDS table object, where each line represents one measurement instance and the different columns represent different measured parameters. If a spectrum was taken, the complete 256 channel spectrum resides in one linecolumn cell of the table. For the details of the file format and a comprehensive description of the PDS labels, see the EAICD in the `DOCUMENT directory. 1.5. Ancillary data No particular ancillary data is needed to interpret the data. 1.6. Coordinate system Right ascension and declination are given in the J2000 frame. Lunar latitudes and longitudes are given in the lunar `mean Earth reference frame t [truncated!, Please see actual data for full text]