PDS_VERSION_ID = PDS3 LABEL_REVISION_NOTE = "2003-05-05, PDS-SBN, Created." OBJECT = DATA_SET DATA_SET_ID = "IRAS-C-FPA-5-AOIMAGE-TEMPEL1-DI-V1.0" OBJECT = DATA_SET_INFORMATION DATA_SET_NAME = " IRAS ADDITIONAL OBS OF 9P/TEMPEL1 REPOROCESSED FOR DI V1.0" DATA_SET_TERSE_DESC = " Reprocessed IRAS Additional Observations (Pointed) Images of comet 9P/Tempel 1 to support the NASA Deep Impact Mission." DATA_SET_COLLECTION_MEMBER_FLG = "N" START_TIME = 1983-06-18 STOP_TIME = 1983-10-08 SPACECRAFT_CLOCK_START_COUNT = 77610997 SPACECRAFT_CLOCK_STOP_COUNT = 87295020 DATA_OBJECT_TYPE = IMAGE DATA_SET_RELEASE_DATE = 2003-05-29 /* Preliminary Review Date */ PRODUCER_FULL_NAME = "STEPHANIE A. MCLAUGHLIN" SOFTWARE_FLAG = "N" DETAILED_CATALOG_FLAG = "N" PROCESSING_START_TIME = "N/A" PROCESSING_STOP_TIME = "N/A" DATA_SET_DESC = " Data Set Overview ================= IRAS devoted almost 40% of its observing time to Additional Observations (AO), that is, pointed observations of selected fields of interest (YOUNGETAL1985). IRAS AOs were acquired by the IR Focal Plane Array, a multi-wavelength detector with spectral bands centered nominally at 12, 25, 60, and 100 microns (BEICHMANETAL1988). To support analysis of the dust coma of comet 9P/Tempel 1 for the Deep Impact Mission, Russell Walker extracted AOs of the comet from the IRAS AO Archive, then reprocessed the images to create in-band radiance and noise maps for photometric measurements. The reprocessing was iterative. Thus, the first iteration and final, best iteration of the radiance and noise maps were supplied for each AO and band combination. All AO radiance and noise images are 241 x 241 square, 15-arcsecond pixels. Each image size is about 1 degree by 1 degree but the IRAS scan is only about 30 arcminutes wide and therefore does not fill the image area. Image array elements that lie outside the scanned area have a value of -9999.0. The comet is not centered in an AO image. The B1950_RIGHT_ASCENSION and B1950_DECLINATION in the PDS label identify the location of the target. Parameters ========== This data set contains AO observations for satellite observation plans and observation numbers (SOP.OBS, that is, OBSERVATION_ID) 287.13, 407.13, 407.43, 509.40, and 510.22 at 12, 25, 60, and 100 microns. OBSERVATION_ID 287.13 was made pre-perhelion, the rest were post-perihelion. Perihelion occurred at UTC 1983-07-09T19:08:11 (Julian date 2445525.2973512). The naming convention for AO images is sSOP_oOBS_BANDum_ITERATION_TYPE.fit where SOP is the satellite observation plan number, OBS is the observation number, BAND is band wavelength in microns, ITERATION is the processing iteration number, and TYPE identifies radiance or noise map. Radiance and noise map images are in units of in-band radiance, Watts/cm^2/steradian. Processing ========== Additional Observations are usually less than 800 seconds in duration, about 0.14 of an IRAS orit. For all AOs in this data set, the apparent pixel size of 15-arcseconds is several time smaller than the best achievable HIRES resolution. Therefore, the HIRES program (MELNYKRICE1991, MELNYK1990) at IPAC, which assumes a fixed target in inertial space during the observation, was used to process the Tempel 1 AOs. HIRES employs the Maximum Correlation Method (AUMANNETAL1990) to construct resolution-enhanced coadded images of observation fields. Refer to DOCUMENT/EXP_SUPP_AO.PDF for details about the HIRES processing used for this data set. Data ==== The data are in the form of FITS files with attached FITS headers and detached PDS labels. Data files contain one radiance image or one noise map per file. Ancillary Data ============== Refer to the CALIB/AO and CALIB/FILTER subdirectory for details. Coordinate System ================= The coordinate system is FK4, equatorial right ascension and declination in the B1950 coordinate frame. The B1950_RIGHT_ASCENSION and B1950_DECLINATION in the PDS label identify the location of the target. Media/Format ============ This data set is released as a CDROM set. " CONFIDENCE_LEVEL_NOTE = " Confidence Level Overview ========================= While the first iteration of radiance and noise maps are provided for each AO, the final (20th) iteration should be used for analysis. Review ====== The data will undergo a preliminary review at the May 2003 PDS-SBN Asteroid Peer Review. " END_OBJECT = DATA_SET_INFORMATION OBJECT = DATA_SET_TARGET TARGET_NAME = "9P/TEMPEL 1 (1867 G1)" END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_HOST INSTRUMENT_HOST_ID = "IRAS" INSTRUMENT_ID = "FPA" END_OBJECT = DATA_SET_HOST OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "AUMANNETAL1990" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "BEICHMANETAL1988"" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "MELNYKRICE1991" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "MELNYK1990" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "YOUNGETAL1985" END_OBJECT = DATA_SET_REFERENCE_INFORMATION END_OBJECT = DATA_SET END