PDS_VERSION_ID = PDS3 LABEL_REVISION_NOTE = " 2009-06-08, P. Gutierrez-Marques - initial version; 2014-04-01, J. Mafi - Vesta liens corrected; 2015-09-10, J. Mafi - Delta review lien corrections;" OBJECT = DATA_SET DATA_SET_ID = "DAWN-CAL-FC2-2-EDR-CALIB-IMAGES-V1.0" OBJECT = DATA_SET_INFORMATION DATA_SET_NAME = "DAWN FC2 CALIBRATION IMAGES V1.0" DATA_SET_TERSE_DESC = "Calibration data for Framing Camera 2 on Dawn during all phases of the mission" DATA_SET_COLLECTION_MEMBER_FLG = N START_TIME = "N/A" STOP_TIME = "N/A" PRODUCER_FULL_NAME = "PABLO GUTIERREZ-MARQUES" DATA_SET_RELEASE_DATE = 2014-04-01 ARCHIVE_STATUS = "IN PEER REVIEW" DETAILED_CATALOG_FLAG = N DATA_OBJECT_TYPE = "IMAGE" CITATION_DESC = " Nathues, A., H. Sierks, P. Gutierrez-Marques, S. Schroeder, J. Ripkin, T. Maue, I. Buettner, M. Richards, U. Chistensen, U. Keller, DAWN FC2 CALIBRATION IMAGES V1.0, DAWN-CAL-FC2-2-EDR-CALIB-IMAGES-V1.0, NASA Planetary Data System, 2013." ABSTRACT_DESC = " Abstract ======== Framing Camera 2 is one of two identical units flying on Dawn spacecraft. This dataset includes the image files to be used in the calibration of the raw data throughout the mission. These files represent the behaviour of each individual pixel with respect to dark current generation and pixel-to-pixel non-uniformity as a function of the filter. As these are elaborated image products, not obtained from a specific image acquisition, they do not have any ancillary data." DATA_SET_DESC = " Dataset overview ================ Framing Camera 2 is one of two identical units flying on Dawn spacecraft. This dataset includes the image files to be used in the calibration of the raw data throughout the mission. These files represent the behaviour of each individual pixel with respect to dark current generation and pixel-to-pixel non-uniformity as a function of the filter. As these are elaborated image products, not obtained from a specific image acquisition, they do not have any ancillary data. The data set contains two types of products. The pixel-to-pixel non-uniformity (flat) images and the dark current genration maps. The flat field images are named FC2_Fx_FLAT.IMG, where x is a number between 1 and 8 for the appropriate filter number and they represent perturbations in the illumination of the CCD due to the filter (dust particles, blemishes, etc.), and they are expected to stay remarkably constant throughout the mission. The dark current maps are filter independent and have seen and will continue to see evolution as the sensor is subject to a high-energy particle environment. They are named FC2_DARK_yyyyyyy.IMG, where yyyyyy is an identifier of the operational slot where the image is of application. This dataset is the primary record of calibration data as it is produced for the consumption of the bigger scientific community. For more information on the contents and organization of the volume set refer to the AAREADME.TXT file located in the root directory of the data volumes. Parameters ========== Filter number: Given that the imperfections vary from filter to filter, one image is created per filter to account for these imperfection. This map is not expected to vary along the mission, but should it be necessary, a set of images per filter could be generated depending on the time of the mission. Mission phase: It is in the nature of the space missions that radiation damage will evolve for worse during the lifetime of the instruments. This makes necessary to keep track of the radiation damage for the different phases of the mission. However, the time scale for significant variation of the radiation damage effects is in the order of several weeks, so it might not be necessary to produce a new set of reference flat fields with every operational slot of the cameras. Still, whenever one of these files is used in the generation of level 1b data (RDR), the header of the RDR will clearly identfy which one of the images was used for the calibration. Processing ========== These calibration products have been produced from ground and flight measurements and are intended for use in the calibration pipeline. The data in one calibration file consists of one image frame, with the accompanying header translated into text format in the label. The dimensions and location (pixel coordinates) of each frame are included for the co-location of the calibration and acquired images during the processing. Each frame is formatted into one file (suffix *.IMG), with an attached label. " CONFIDENCE_LEVEL_NOTE = " Product Versions ================ This archive includes all versions of calibration images that have been submitted for archive, including some that have been superseded by newer versions. Data users should consider the latest version of the file as the best available. " END_OBJECT = DATA_SET_INFORMATION OBJECT = DATA_SET_MISSION MISSION_NAME = "DAWN MISSION TO VESTA AND CERES" END_OBJECT = DATA_SET_MISSION OBJECT = DATA_SET_HOST INSTRUMENT_HOST_ID = DAWN INSTRUMENT_ID = "FC2" END_OBJECT = DATA_SET_HOST OBJECT = DATA_SET_TARGET TARGET_NAME = "N/A" END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "N/A" END_OBJECT = DATA_SET_REFERENCE_INFORMATION END_OBJECT = DATA_SET END