Data Set Information
DATA_SET_NAME NEAR-INFRARED IMAGES OF COMET 9P/TEMPEL 1 V1.0
DATA_SET_ID DI/EAR-C-SQIID-3-9PNIRIMAGES-V1.0
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
DATA_SET_DESCRIPTION Data Set Overview : This dataset contains raw and reduced near-infrared images of comet 9P/Tempel 1, the target of the Deep Impact mission. Images were obtained from UT July 2-9, 2005, before, during, and after the Deep Impact encounter by M. Knight, R. Swaters, and N. Samarasinha using the Simultaneous Quad Infrared Imaging Device (SQIID) on the Kitt Peak National Observatory (KPNO) 2.1-m telescope. Observations were made simultaneously in J (1.1-1.402 microns), H (1.535-1.809 microns), and K (1.95-2.30 microns). L band images were not saved due to saturation of the detectors caused by the high sky background in the summer. The calibration procedure and photometric results are described in detail in the paper 'Ground-based visible and near-IR observations of Comet 9P/Tempel 1 during the Deep Impact encounter' by Knight et al. 2007 [KNIGHTETAL2007]. The published light curve for this data set is being combined with that of the optical data set collected on 2-5 July 2005 from San Pedro Martir (DI/EAR-C-I0276-2/3-MARTIR15M-TMPL1-V1.0) and is in preparation at the Small Bodies Node. Processing : Images were processed using the IRAF UPSQIID package. The UPSQIID package is available for download at http://www.noao.edu/kpno/sqiid/upsqiid.tar. A guide to data reductions using UPSQIID is available at http://www.noao.edu/kpno/sqiid/upsqiidpkg.html. Both the UPSQIID IRAF package (UPSQIID.TAR) and the guide to reductions (UPSQIIDPKG.*) are reproduced in this archive with permission from NOAO. A dark frame was created for each filter, exposure, and coaddition combinition using the USQDARK routine. This incorporates both the base current (bias) and a time-dependent current (dark). Flat fields were constructed for each filter each night from standard star fields and off source pointings using the USQFLAT routine. Processed images in this archive were created by subtracting the dark frame and dividing by the flat field frame. Images were processed further for the photometric calculations in Knight et al. 2007 [KNIGHTETAL2007]. This included correcting for non-linearity and subtraction of a median background. The response of the SQIID detectors is non-linear for large counts. In general this effect is small enough to be ignored. If the user wishes to correct for the non-linearity they should refer to the non-linearity section (section 8) of the SQIID user's manual (SQIIDMANUAL.*). The standard star field S791-C (RA : 13h17m29.6s, Dec : -05d32m37s) from Persson et al. (1998) [PERSSONETAL1998] was selected for its proximity to the comet in both RA and Dec throughout the run, allowing standard star observations to be interspersed with comet observations. The stars in the field were used to calculate atmospheric extinction corrections and absolute flux calibrations. For photometric calculations, additional standard star photometry was obtained from 2MASS (Skrutskie et al. 2006 [SKRUTSKIEETAL2006]). Magnitudes were calculated using a circular 3.5 arcsec radius aperture (13 pixel radius). Further discussion of the calibration and photometric results can be found in Knight et al. 2007 [KNIGHTETAL2007]. Data : This data set consists of a calibrated photometry table and plot, 1770 reduced images (1413 comet frames, 72 sky frames, and 285 standard star frames) and 2894 raw images (1124 dark frames plus the same 1770 frames in the reduced archive). The reduced images are supplied as flattened, bias and dark subtracted two-dimensional FITS image files with headers produced by the SQIID data acquisition software. The geometric circumstances of the comet and the sky conditions from Knight et al. 2007 [KNIGHTETAL2007] are reproduced here. UT Date UT time r delta comet standard conditions (2005) (h) (AU) (AU) airmass star airmass range range ---------------------------------------------------------------- July 2 5.1-5.3 1.506 0.884 1.8-2.0 none partly cloudy July 3 3.8-6.8 1.506 0.889 1.5-4.0 1.4-1.7 photometric July 4 4.1-7.3 1.506 0.894 1.5-8.4 1.4-2.0 high sky background July 5 3.5-6.5 1.506 0.899 1.4-3.5 1.4-2.0 photometric July 6 3.7-6.5 1.506 0.905 1.5-3.8 1.4-2.1 photometric July 7 3.7-6.5 1.506 0.910 1.5-4.0 1.4-2.2 photometric July 8 3.7-6.5 1.506 0.915 1.5-3.9 1.4-2.3 photometric July 9 3.7-6.5 1.507 0.921 1.5-3.7 1.4-2.1 photometric When displaying a FITS image from this data set, North is approximately up and East is to the left. Summary of included material : Products -------- RAW/N1/ : Raw images from July 2, 2005 (UT) N2/ : Raw images from July 3, 2005 (UT) N3/ : Raw images from July 4, 2005 (UT) N4/ : Raw images from July 5, 2005 (UT) N5/ : Raw images from July 6, 2005 (UT) N6/ : Raw images from July 7, 2005 (UT) N7/ : Raw images from July 8, 2005 (UT) N8/ : Raw images from July 9, 2005 (UT) REDUCED/N1/ : Calibrated images from July 2, 2005 (UT) N2/ : Calibrated images from July 3, 2005 (UT) N3/ : Calibrated images from July 4, 2005 (UT) N4/ : Calibrated images from July 5, 2005 (UT) N5/ : Calibrated images from July 6, 2005 (UT) N6/ : Calibrated images from July 7, 2005 (UT) N7/ : Calibrated images from July 8, 2005 (UT) N8/ : Calibrated images from July 9, 2005 (UT) Ancillary data -------------- OBS_LOG.TXT : Observing log COMET_POS.TXT : File of comet positions in each image KPNO_MAGNITUDES.TAB : Table of KPNO near-IR magnitudes of 9P/Tempel 1 KPNO_PHOTOMETRY.* : Plot of KPNO near-IR photometry of 9P/Tempel 1 SQIIDMANUAL.* : SQIID user's manual (ASCII text and PDF) SQIIDSUPPL.* : SQIID user's manual supplement (ASCII text and PDF) UPSQIIDPKG.TXT : IRAF UPSQIID data reduction package user's manual UPSQIID_SOFTWARE : Directory of IRAF UPSQIID data reduction package programs
DATA_SET_RELEASE_DATE 2007-04-06T00:00:00.000Z
START_TIME 2005-07-02T04:58:04.000Z
STOP_TIME 2005-07-09T06:18:41.000Z
MISSION_NAME DEEP IMPACT
SUPPORT ARCHIVES
MISSION_START_DATE 2005-01-12T12:00:00.000Z
2004-03-22T12:00:00.000Z
MISSION_STOP_DATE 2005-07-13T12:00:00.000Z
N/A (ongoing)
TARGET_NAME CALIBRATION
SKY
9P/TEMPEL 1 (1867 G1)
TARGET_TYPE CALIBRATION
COMET
INSTRUMENT_HOST_ID OBS321T3
INSTRUMENT_NAME SIMULTANEOUS QUAD INFRARED IMAGING DEVICE (SQIID)
INSTRUMENT_ID SQIID
INSTRUMENT_TYPE CAMERA
NODE_NAME Small Bodies
ARCHIVE_STATUS ARCHIVED
CONFIDENCE_LEVEL_NOTE Confidence Level Overview : Standard techniques were used for the reduction of the data and are documented in Knight et al. 2007 [KNIGHTETAL2007]. Images have not been corrected for the non-linearity of the CCD. See section 8 of the SQIID user's manual (SQIIDMANUALDOC.*).for more details.
CITATION_DESCRIPTION Knight, M.M., Near-infrared images of comet 9P/Tempel 1 V1.0. DI/EAR-C-SQIID-3-9PNIRIMAGES-V1.0. NASA Planetary Data System, 2007.
ABSTRACT_TEXT This dataset contains raw and reduced near-infrared images of comet 9P/Tempel 1, the target of the Deep Impact mission. Images were obtained from UT July 2-9, 2005 by M. Knight, R. Swaters, and N. Samarasinha using the Simultaneous Quad Infrared Imaging Device at the KPNO 2.1-m telescope. Results are published in the paper 'Ground-based visible and near-IR observations of Comet 9P/Tempel 1 during the Deep Impact encounter' by Knight et al. 2007 [KNIGHTETAL2007].
PRODUCER_FULL_NAME MATTHEW KNIGHT
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