PDS_VERSION_ID = PDS3 RECORD_TYPE = "STREAM" OBJECT = TEXT NOTE = " AAREADME file for the EPOXI HRIV (High Resolution Visible CCD) Earth Observations Raw Data Archive. " PUBLICATION_DATE = 2010-09-10 END_OBJECT = TEXT END Introduction ============ This data set contains raw, narrow band filter images (350-950 nm) of Earth acquired by the Deep Impact High Resolution Visible CCD (HRIV) during the EPOCh and Cruise 2 phases of the EPOXI mission. Five sets of observations were acquired on 18-19 March, 28-29 May and 04-05 June 2008 and on 27-28 March and 04-05 October 2009 to characterize Earth as an analog for extrasolar planets. Each observing period lasted approximately 24 hours. HRIV images were acquired once per hour with the filters centered on 350, 750 and 950 nm, whereas the 450-, 550-, 650-, and 850-nm data were taken every 15 minutes. During the observing period in May 2008, the Moon transited across Earth as seen from the spacecraft. On 27 September 2009 during the first attempt of an Earth south polar observation, only seven HRIV frames were acquired before fault protection turned that instrument off; the full sequence was successfully rerun on 04-05 October 2009. Data Releases ============= The releases for this data set are provided here: Release Number : 1 Release Date : 2009-09-30 Data Coverage : 2008-03-18/078 to 2008-06-05/157 Archive Date : 2009-09-30 Release Number : 2 Release Date : 2010-09-10 Data Coverage : 2009-03-27/086 to 2009-10-05/278 Archive Date : 2010-11-30 Volume Format ============= This volume has been formatted according to the ISO-9660 level 2 Interchange Standard for directories and file names as described in Version 3.7 of the PDS Standards Reference. File Formats ============ All text documents and other meta information files such as descriptions, PDS object definitions, and detached PDS labels are stream format files, with a carriage return (ASCII 13) and a line feed character (ASCII 10) at the end of the record. This allows the files to be read by various operating systems. Volume Contents =============== Files on this volume are organized into a set of subdirectories below the top-level directory. The following table shows the general structure and content of these directories but does not exhaustively list every file in each directory. In the table, directory names are surrounded by forward slashes (/), and the top-level of the volume is indicated by a single forward slash. See the *INFO.TXT files in each top-level sub-directory for specific information about the files under that directory. / Top level of volume | |-- AAREADME.TXT This file | |-- ERRATA.TXT Known anomalies concerning this volume | |-- VOLDESC.CAT Description of the logical contents of this volume | |--/CATALOG/ Directory containing PDS catalog objects | | | |-- CATINFO.TXT Description of files in this subdirectory | |-- DATASET.CAT Description of this data set | |-- DIF.CAT Description of the Deep Impact flyby spacecraft | |-- EPOXI.CAT Description of the EPOXI mission | |-- HRIV.CAT Description of the HRIV instrument | |-- PERSONNEL.CAT Personnel involved in creating this archive | |-- REF.CAT References to works cited in catalog objects | +-- EARTH.CAT Earth target catalog file | | |--/DATA/ Directory containing raw data products | | | +--/YYYY/ Multiple year directories, as needed | | | +--/DDD/ Multiple day-of-year directories | | | |-- *.FIT FITS file, 2-D CCD image with one extension | +-- *.LBL PDS label, one for each FITS file | | |--/DOCUMENT/ Directory of documents most useful for | | understanding this data set; Each document has one | | PDS label; The full documentation set for Deep | | Impact and EPOXI is available in the PDS data set | | DI-C-HRII/HRIV/MRI/ITS-6-DOC-SET-V3.0 | | | |-- DOCINFO.TXT Description of files in this subdirectory | | | |-- CALIBRATION_PAPER_DRAFT.* | | Incomplete draft of the Deep Impact instrument | | calibration paper | | | |-- DAY_OF_YEAR_CALENDAR.* | | Perpetual and leap year day of year calendars | | | |-- EPOCH_EARTH_GEOM_yyyymmm.* | | Observational geometry provided by EPOCh team | | from their analysis of Earth data from the | | specified period (yyyy = year, mmm = month) | | | |-- EPOCH_MOON_GEOM_2008MAY.* | | Observational geometry provided by EPOCh team | | from their analysis of the lunar transit | | captured in the May 2008 Earth data. | | | |-- EPOCH_EARTH_OBS.* | | Describes EPOCh Earth observations | | | |-- EPOCH_EARTH_SEQ_yyyy.* | | Provides pointing and sequencing information | | for the EPOCh Earth observations in the | | specifiec year (yyyy) including descriptions | | of the HRII scans of Earth (scan direction, | | rate, etc.) | | | |-- EPOCH_OVERVIEW.* Provides an overview of the EPOCh phase of the | | EPOXI mission | | | |-- EPOXI_SIS.* Describes the EPOXI archive volumes, data sets, | | and data products | | | |-- HRIV_2_EPOXI_EARTH.* | | Provides image parameters from the data labels | | that are most useful for scientific work such | | exposure duration and observation description | | | |-- INSTRUMENTS_HAMPTON.* | | Submitted version of the publication that | | describes the Deep Impact instruments in detail | | | |-- PDSDD_EPOXI.* Provides the EPOXI local data dictionary used | | used to verify this PDS data set | | | +-- QUATERNION_DESC.* | Describes how to use the quaternion specified | in the data labels | | +--/INDEX/ Directory containing index files | |-- INDXINFO.TXT Description of files in this subdirectory |-- INDEX.TAB Table locating data files on this data set |-- INDEX.LBL PDS label for index.tab |-- CHECKSUM.TAB MD5 checksum file for this data set +-- CHECKSUM.LBL PDS label for checksum.tab Whom to Contact for Information =============================== Questions regarding the scientific elements of this data set should be directed to: Michael A'Hearn Principal Investigator, EPOXI Department of Astronomy, University of Maryland College Park, Maryland 20742 USA Drake Deming Co-PI, EPOXI Principal Investigator, EPOCh Investigation Goddard Space Flight Center Greenbelt, MD 20771 USA Kenneth Klaasen Calibration and Sequencing Lead, EPOXI Jet Propulsion Laboratory 4800 Oak Grove Drive Pasadena, CA 91109 USA Dennis Wellnitz Sequencing Lead, EPOCh Investigation Department of Astronomy, University of Maryland College Park, Maryland 20742 USA Questions about data formats and geometry-related information should be directed to: Brian Carcich EPOXI Science Data Center Department of Astronomy, Cornell University 610 Space Sciences Building Ithaca, NY 14853 USA Questions regarding the PDS elements in this data set should be directed to: Stephanie McLaughlin EPOXI Archive Team Department of Astronomy, University of Maryland College Park, Maryland 20742 USA