Data Set Information
DATA_SET_NAME IHW COMET HALLEY INFRARED IMAGE DATA, V2.0
DATA_SET_ID IHW-C-IRIMAG-3-EDR-HALLEY-V2.0
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
DATA_SET_DESCRIPTION Data Set Overview : This data set contains the infrared images collected and archived by the International Halley Watch (IHW) Infrared Studies Network (IRSN). Raw and calibrated data are included, as well as calibration observations of standard stars. These data have been reformatted and the accompanying documentation updated in this revised version. Four observatories contributed IR images to the IRSN: the Wyoming Infrared Observatory; the NASA Infrared Telescope Facility; the Kitt Peak National Observatory; and the Whipple Observatory. The source of each image is indicated in both its FITS header and PDS label, as is instrumentation. Modification History : The PDS sections of this data set have undergone extensive revision, while the FITS data files themselves have remained almost completely untouched. The following changes were made: o The FITS images were originally archived with the header and data segment for each image in a separate files. In this version the FITS files have been restored to proper FITS format. o All PDS labels were completely rewritten by extracting values from the FITS headers and editing by hand as needed. o All catalog files have been rewritten from scratch. o All index and volume support files have been regenerated. o All reported errata were corrected. Specific changes and enhancements to the labels include: o The PROCESSING_LEVEL_ID element has been added to allow programmatic differentiation between raw data ('1'), calibration data ('2') and calibrated data ('3'). These levels correspond roughly to the CODMAC data levels. o For calibration target observations, the TARGET_NAME element contains 'CALIBRATION' and the specific name of the calibration star can be found in the TARGET_DESC element immediately following it. o All comments and history notes from the FITS headers have been repeated in the PDS label as part of the DESCRIPTION text. The only editing performed on these comments was to convert double-quotes to two consecutive single quotes (because of PDS formatting constraints). o Details of observatory location and instrumentation have also been added to the DESCRIPTION field. In addition, known errata were corrected, including both the errata noted by Mikael Aronsson at JPL as he prapared the IHW Printed Archive and Printed Archive Index documents (and included on the HAL_0023 volume), and the errata collected after publication at the PDS Small Bodies Node. General Notes : Times ----- The observation times were reported as day fractions with anywhere from one to five decimal places of precision. These have been converted to the ISO standard format (YYYY-MM-DDThh:mm:ss) to a corrsponding level of accuracy. System Codes ------------ The IHW directives for the SYSTEM keyword in the original FITS files mandated a format of 'dooottii', where d : discipline, ooo : IAU observatory code, tt : country code, and ii : (optional) telescope/instrument number assigned by the Infrared Studies Network. For observatories that did not have an IAU code, ooo : 500 and in most of these cases ii : 00. Thus, all U.S. observatories without and IAU code will have SYSTEM : '25001600' in their IRSN contributions. 23 August 2006, A.C.Raugh.
DATA_SET_RELEASE_DATE 1992-09-30T00:00:00.000Z
START_TIME 1985-09-16T11:48:29.000Z
STOP_TIME 1986-05-23T04:29:16.000Z
MISSION_NAME INTERNATIONAL HALLEY WATCH
MISSION_START_DATE 1980-09-01T12:00:00.000Z
MISSION_STOP_DATE 1992-09-30T12:00:00.000Z
TARGET_NAME CALIBRATION
1P/HALLEY 1 (1682 Q1)
TARGET_TYPE CALIBRATION
COMET
INSTRUMENT_HOST_ID IRSN
INSTRUMENT_NAME IHW INFRARED IMAGING DATA
INSTRUMENT_ID IRIMAG
INSTRUMENT_TYPE INFRARED IMAGING DEVICE
NODE_NAME Small Bodies
ARCHIVE_STATUS IN_LIEN_RESOLUTION
CONFIDENCE_LEVEL_NOTE Confidence Level Overview : The data are in several different stages of reduction, and those that have been reduced to physical units are not all in the same unit (milli-Jansky vs. micro-Jansky). In a few cases, an error map is supplied for a reduced images. In general, a user should read the entire PDS label and FITS header carefully for each image he is planning to reference to be sure of finding all the caveats and idiosyncracies of any particular image.
CITATION_DESCRIPTION Knacke, R.F. and T. Encrenaz, IHW COMET HALLEY INFRARED IMAGE DATA, V2.0, IHW-C-IRIMAG-3-EDR-HALLEY-V2.0, NASA Planetary Data System, 2006.
ABSTRACT_TEXT This data set contains the infrared images collected and archived by the International Halley Watch (IHW) Infrared Studies Network (IRSN). Raw and calibrated data are included, as well as calibration observations of standard stars. These data have been reformatted and the accompanying documentation updated in this revised version.
PRODUCER_FULL_NAME GRAYZECK, E.J., KLINGLESMITH, D.A., III, NIEDNER, M.B., JR
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