PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM ^TEXT = "AAREADME.TXT" OBJECT = TEXT PUBLICATION_DATE = 2017-09-22 NOTE = "AAREADME.TXT describes this volume." END_OBJECT = TEXT END Volume DWNCFC1_1B Dawn Framing Camera 1 Calibrated Level-1B Ceres Extended Mission Archive ============================================================================== Brief Disk Description ============================================================================== This volume contains calibrated level-1B (RDR) Framing Camera 1 images acquired during Dawn Ceres eXtended Mission Orbit 3 (XMO3) or Ceres Extended GRaND (CXG) phase on 2017-02-19 and the Ceres eXtended Mission Orbit 4 (XMO4) or Ceres Extended Opposition (CXO) phase on 2017-04-29. NOTE: Reading the Science Plan (located in the /DOCUMENTS/SCIENCE_PLAN directory) is critical to the understanding of the Ceres observations and science objectives. Other critical documentation in the DOCUMENT directory include the volume SIS and calibration procedure. The images in this dataset have been radiometrically calibrated by means of fully reversible procedures, transforming the value of the pixels from digital units to applicable engineering units without modification of the geometry. Color filter data have been calibrated to units of spectral irradiance and the clear filter data to radiance. All images are stored in the 'DATA' branch of the directory tree. The data are provided in both PDS Image (IMG) and FITS formats. Anciliary information is stored within the image headers for the IMG, and in detached PDS labels for the FITS files. Calibration files needed for further processing are archived as part of the DAWN-CAL-FC1-2-EDR-CALIB-IMAGES-V1.0 data set. Please refer to the calibration data set catalog for a discussion of which files should be used for each activity. More information describing the image and volume format is contained in the Software Interface Specification (SIS). A copy of the SIS is provided in the /DOCUMENT/SIS directory of this volume. SPICE kernels are archived by the NAIF Node of the PDS. Users of these data are encouraged to acknowledge both the PDS and the principal investigators of the instruments whose data is used in analysis in all publications. ============================================================================== Image File Naming Convention ============================================================================== Convention: FCxllimageid_yydddhhmmssFnz.IMG Example: FC11B0003923_11223174143F1A.IMG Where: FCx indicates the instrument (FC1) ll indicates the data processing level (1B) IMAGEID image id (7 characters, zero-padded - 0003923) yyddd indicates the image acquisition year/doy (11223) hhmmss indicates the image acquisition SCET (UTC - 174143) Fn n indicates the filter number used in capturing the image (F1) z indicates the data file version (A-Z - A) Note that in instances (like spacecraft safings, etc.) where the Framing Camera powered off without being able to store the last image number used, images were generated with duplicate image numbers. In order to eliminate the duplication 3,000,000 was added to the image number in the ground processing (e.g. a duplicate image number 0014325 would become image number 3014325). As a result consecutive images may not always have consecutive image numbers. ============================================================================== Volume Set Information ============================================================================== This volume is part of the Framing Camera 1 calibrated level-1B RDR images volume set. This volume set includes the following volumes: Volume ID Description ------------------------------------------------------- DWNXFC1_1B Dawn FC1 L1-B RDR cruise images DWNCFC1_1B Dawn FC1 L1-B RDR Ceres Extended Mission images ============================================================================== Mission Facts ============================================================================== The 'Dawn Science Observations' table below provides a list of scientific observations made by the Dawn instruments. It includes the observation start date, the ID of the phase in which it occurred, the activity name, and a brief description. Footnotes describing the availability or organization of specific data from specific observations are located at the end of this table and are indicated in the Activity Description by numbers in square brackets. For all of the prime mission and the early extended mission at Ceres, there were no science observation made with FC1. This instrument was designated as redundant hardware for a critical flight component. However, when the Ceres opposition (zero phase) observation was being planned it was clear that Dawn would only get one chance to acquire these images. In order to protect against a FC2 instrument reset or other failure, it was decided to operate both cameras simultaneously. Since this had never been done in flight, dual operation was initially tested at the end of CXG (Cycle 3) during RC4_NORTH_002. ------------------------------------------------------------------------------ Dawn Ceres Science Observations ------------------------------------------------------------------------------ Start Mission Activity Activity Date Phase Name Description ------------------------------------------------------------------------------ 16-12-14 CXG XMO3 Ceres Extended GRaND Phase (range ~8000-9500 km) ------------------------------------------------------------------------------ 17-02-19 CXG CYCLE3 296 FC2~nadir clear+color (1 orbit) 96 FC1~nadir clear+color ------------------------------------------------------------------------------ 17-04-28 CXO XMO4 Ceres Extended Opposition Phase (range 14-55E3 km) ------------------------------------------------------------------------------ 17-04-29 CX0 Opposition 194 FC2~nadir clear+color (range ~20,000 km) 188* FC1~nadir clear+color ------------------------------------------------------------------------------ * FC1 clear images were interleaved with the FC2 clear images by acquiring them at the same cadence (5 minutes) but offset in time 2.5 minutes later. FC1 color images were acquired inbound to minimum phase and FC2 images were acquired on the outbound leg providing functional redundancy while maximizing science return. ============================================================================== File Formats ============================================================================== The image files on this volume are binary images. IMG files have an attached ASCII header (PDS label). The FITS versions have a detached PDS label. The PDS label contains information describing spacecraft, target, and imaging parameters characterizing the attached image. A data set description, instrument description, and other PDS documents are in .CAT files in the /CATALOG directory. In more recent versions of the Microsoft Windows operating system the .CAT by default is reserved as 'Security Catalog.' The .CAT files contained in this volume are ASCII text files, and can be read by any form of text editor. To make Windows open files with this name extension as text files, do the following. In Windows Explorer, open the 'Tools' menu and select 'Folder Options'. Select the 'File Types' tab and select 'CAT' from the list. Press 'Change...' and then choose your prefered text editor or viewer. We do not know of any harmful effects this might have on the operating system or other programs, but do not guarantee it will be entirely safe to make this change. If problems occur, the change can be undone in the same 'File Types' window by changing the default application back to 'crypto shell extension'. Additional documentation is generally located in the DOCUMENT directory. ============================================================================== Errata ============================================================================== Every effort has been made to assure that the data and documentation are of the best possible quality. However, mistakes are inevitable. There is a file called ERRATA.TXT found at the root level of this volume which contains a list of known deficiencies or caveats associated with data on this volume at the time this volume was produced. ============================================================================== Volume Contents and Structure ============================================================================== This section describes the volume structure and naming conventions. Below is a tree diagram of the volume, followed by a description of the directory function and key files in each directory. DWNCFC1_1B (root directory) | |- AAREADME.TXT Describes volume contents, and organization (this file) | |- ERRATA.TXT Describes known deficiencies or caveats in the data or | on this volume. | |- VOLDESC.CAT High level description of volume contents. | | |- [CATALOG] PDS catalog files containing information describing the | data, instrument, instrument personnel, relevant references, | the spacecraft, and mission. | |- [BROWSE] JPG thumbnail versions of the images provided in DATA area. | |- [DATA] Contains the images in both PDS IMG, and FITS format. The | images are divided up into separate subdirectories by | mission phase, cycle or activity, and orbit (if needed). | |- [DOCUMENT] Contains documents describing the instrument, and use of the | images | |- [GEOMETRY] Contains a SPICE metakernel created by theFraming Camera Team to describe the time-varying instrument alignment. This is not a NAIF product. ============================================================================ Contacts ============================================================================ This volume was produced for the Planetary Data System (PDS) at the Small Bodies node. The images, and associated metadata were supplied by Pablo Gutierrez-Marques, and Joachim Ripken at the Max-Planck Institute for Solar System Research (MPS). The volume was assembled at the Dawn Science Center (DSC), by Joseph N. Mafi. For questions or problems regarding the volume, please contact Dr. Carol Neese at the PDS Small Bodies Node: Email neese@psi.edu Telephone 520-622-6300 Mail Carol Neese Planetary Science Institute 1700 E. Ft. Lowell, Ste. 106 Tuscon, AZ 85719-2395 USA For question regarding the data, please contact Pablo Gutierrez-Marques at MPS: Email gutierrez@mps.mpg.de Telephone +49 (0) 5556 979 313 Mail Max Planck Institute for Solar System Research Justus-von-Liebig-Weg 3, 37077 Gottingen, GERMANY For questions regarding PDS Standards or other archives available from the PDS, please contact PDS Operator at the PDS Engineering Node (at JPL): Email pds_operator@jpl.nasa.gov Telephone 818-354-4321 Mail Planetary Data System, PDS Operator Jet Propulsion Laboratory Mail Stop 202-101 4800 Oak Grove Dr. Pasadena, CA 91109-8099 USA The PDS assumes no legal liability for errors on this disk. All users are encouraged to verify the correctness of the data prior to submitting any publications or other work based on these data. Please report errors on this disk to the Small Bodies Node of the PDS through the ERRATA reporting procedures described above.