PDS_VERSION_ID = PDS3 RECORD_TYPE = "FIXED_LENGTH" RECORD_BYTES = 2880 FILE_RECORDS = 502 ^HEADER = "HRIVIS_CANOPUS_081217_1_0_2.FIT" ^IMAGE = ("HRIVIS_CANOPUS_081217_1_0_2.FIT", 3) DATA_SET_ID = "DIF-CAL-HRIV-6-EPOXI-STELLAR-PSFS-V1.0" MISSION_NAME = "EPOXI" INSTRUMENT_HOST_NAME = "DEEP IMPACT FLYBY SPACECRAFT" INSTRUMENT_HOST_ID = "DIF" INSTRUMENT_NAME = "DEEP IMPACT HIGH RESOLUTION INSTRUMENT - VISIBLE CCD" INSTRUMENT_ID = "HRIV" PRODUCT_ID = "HRIVIS_CANOPUS_081217_1_0_2" PRODUCT_NAME = "EPOXI HRIV DRIZZLE POINT SPREAD FUNCTION, FILTER 2" PRODUCT_CREATION_TIME = 2009-03-31T17:03:34 START_TIME = 2008-12-17T10:00:46.1 STOP_TIME = 2008-12-17T10:03:26.8 SPACECRAFT_CLOCK_START_COUNT = "N/A" SPACECRAFT_CLOCK_STOP_COUNT = "N/A" FILTER_NAME = "BLUE" FILTER_NUMBER = "2" CENTER_FILTER_WAVELENGTH = 450 TARGET_NAME = "CANOPUS" INSTRUMENT_MODE_ID = "N/A" DESCRIPTION = "This is a filter-specific, 600x600 pixel, point spread function derived in 2009 for the EPOXI/EPOCh science mission. The PSF was created by Richard K. Barry NASA/GSFC using drizzle routines defined by Fruchter, A.S. and R.N. Hook in ''Drizzle: A Method for the Linear Reconstruction of Undersampled Images'', Publications of the Astronomical Society of the Pacific, Volume 114, Issue 792, pages 144-152, 2002; bibcode 2002PASP..114..144F; DOI 10.1086/3383393. Information from the FITS header about this PSF: NIMAGES = 30 /Number of images drizzled to psf PIXFRAC = 0.800000 /Drizzle keyword. See Fruchter & Hook,2002 PASP SCALE = 0.100000 /Drizzle keyword. See Fruchter & Hook,2002 PASP STRCOLOR= 0.150000 /B-V Color of host star. From SIMBAD RADIUS90= 64.3996 /Photometric aperture that contains 90% totflux RADIUS95= 88.4993 /Photometric aperture that contains 95% totflux RADIUS99= 235.405 /Photometric aperture that contains 99% totflux OBSJD = '2454817.91720217' /JD of first image drizzled for this PSF. OBSENDJD= '2454817.91906267' /JD of the final image drizzled for this PSF. COMMENT ********************************************************************** COMMENT ** PIXFRAC: The pixels of the input image are multiplied by PIXFRAC COMMENT ** before being drizzled onto the subsampled output PSF grid. COMMENT ** COMMENT ** SCALE: The degree of subsampling of the output is set by SCALE. COMMENT ** The resulting PSF pixel size is SCALE times the input pixel size. COMMENT ** COMMENT ** Radius90, Radius95 and Radius99 are given in PSF pixels. COMMENT ** COMMENT ** Note: The observer should expect variation in the observed image COMMENT ** due to pointing drift and the commensurate changes in optical COMMENT ** geometry of the light path through the instrument and COMMENT ** changes in detected light due to differences in sensitivity of COMMENT ** individual pixels and the noted inter-chip gap. (See Klaasen COMMENT ** et al., 2008.) However, analysis conducted by D. Lindler suggests COMMENT ** that there is negligable temporal change in overall sensitivity of COMMENT ** the detector and in distortion caused by the optics over the entire COMMENT ** EPOXI scientific investigation. This further suggests that this COMMENT ** PSF may be used for most observations conducted using the HRI. COMMENT ********************************************************************** " OBJECT = HEADER HEADER_TYPE = "FITS" INTERCHANGE_FORMAT = "BINARY" BYTES = 2880 RECORDS = 2 DESCRIPTION = "FITS format defined in NASA/Science Office Standards Technology 100-1.0" END_OBJECT = HEADER OBJECT = IMAGE AXIS_ORDER_TYPE = "FIRST_INDEX_FASTEST" SAMPLE_BITS = 32 LINE_SAMPLES = 600 LINES = 600 SAMPLE_TYPE = "IEEE_REAL" SAMPLE_DISPLAY_DIRECTION = "RIGHT" LINE_DISPLAY_DIRECTION = "UP" END_OBJECT = IMAGE END