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Data Set Information
DATA_SET_NAME MSSSO CASPIR STAR CALS BEFORE SL9 IMPACTS WITH JUPITER V1.0
DATA_SET_ID MSSSO-J-CASPIR-3-RDR-SL9-STDS-V1.0
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
DATA_SET_DESCRIPTION
Data Set Overview : This archive contains star images used as calibrations in preparation for the collision of Comet Shoemaker-Levy 9 with Jupiter obtained with CASPIR on the Australian National University 2.3 m telescope at Siding Spring Observatory, Australia, by Peter J. McGregor and Mark G. Allen. Each subdirectory contains data for one night. A more specific description of the state of the data is given below.   Processing : The images have 256x256 pixels with a pixel size of 0.25arcsec x 0.25arcsec on the sky. Celestial north is up and east to the left when displayed with IRAF. The images have been bias subtracted, corrected for detector non-linearities, flat-fielded, sky-subtracted, bad pixel corrected by interpolation, and scaled to an effective exposure time of 1 sec. Strictly, the data are in units of detected electrons above sky per sec per pixel. Files with an 's' suffix either have had a residual odd-even column bias pattern removed, or a constant value determined from a clear sky region has been subtracted. Files with a 'c' suffix have also had ghost reflections partially removed using imedit in IRAF. No airmass-dependent corrections have been applied.   Ancillary Data : Two offset measurements were obtained of each standard star. The difference images of these standard star measurements are contained in ddnnnmmm.fit files where dd is the day, nnn is the run number of the added image and mmm is the run number of the subtracted image. The Jupiter data have not been flux calibrated, but these standard star measurements can be used to do so. Recommended atmospheric extinction coefficients are listed in Table 1. Recommended narrow band standard star magnitudes are listed in Table 2. Broad band standard stars have the following magnitudes: HD129540 K:8.25, Kn:8.25; HD193727 K:8.78, Kn:8.78; BS4450 M:1.40; BS6147 M:2.20.  Table 1. Extinction Coefficients (Mag/airmass)  nb108 0.12 nb308 0.19 nb109 0.12 nb330 0.19 nb128 0.12 nb342 0.19 nb164 0.08 nb359 0.19 nb165 0.08 nb399 0.19 nb200 0.11 nb212 0.10 M 0.20 nb217 0.10 K 0.10 nb221 0.11 Kn 0.10 nb225 0.11 nb234  Table 2. Standard Star Magnitudes.  Filter BS4773 Y3296  nb108 4.12 7.19 nb109 4.13 7.08 nb128 4.19 6.75 nb164 4.25 6.18 nb165 4.25 6.18 nb200 4.29 6.07 nb212 4.30 6.04 nb217 4.30 5.92 nb221 4.30 5.89 nb225 4.31 5.88 nb234 4.31 5.93 nb308 4.34 5.69 nb330 4.34 5.65 nb342 4.35 5.64 nb359 4.36 5.64 nb399 4.36 5.64  The zero magnitude flux calibration is given by  Fnu : 5513/[w**3*(exp(1.285/w)-1)] Jy  where w is the effective wavelength of the filter in units of microns (e.g., 2.34 microns for the nb234 filter).   Data structure : The data are in fits files with the following header entries. Keywords not listed here should be ignored. All data are normalised to an exposure time of 1 second specified by the EXPOSURE keyword. All frames are oriented north up and east to the left; the POS_ANG keyword has only instrumental significance. The IRAFNAME keyword uniquely identifies the file, being derived from the original run number listed in the RUN keyword.  SIMPLE : T / FITS STANDARD BITPIX : -32 / FITS BITS/PIXEL NAXIS : 2 / NUMBER OF AXES NAXIS1 : 256 / NAXIS2 : 256 / OBJECT : ' JUPITER' / ORIGIN : 'KPNO-IRAF' / DATE : '29-04-95' / IRAFNAME: 'ir101 ' / NAME OF IRAF IMAGE FILE IRAF-MAX: 1.818423E4 / DATA MAX IRAF-MIN: 3.521613E3 / DATA MIN IRAF-BPX: 32 / DATA BITS/PIXEL IRAFTYPE: 'REAL ' / PIXEL TYPE ALT_OBS : 1149 / Telescope height above mean sea / level (metres) TELESCOP: 'SSO 2.3METRE ' / ANU 2.3 metre telescope INSTRUME: 'CASPIR ' / Cryogenic Array Spectrometer Imager LAT_OBS : -3.1273361100000E+01 / Observatory Latitude (degrees) LONG_OBS: 1.4906119444000E+02 / Observatory East Longitude (degrees) RUN : 101 / Run number DETECTOR: 'SBRC ' / Santa Barbara Research Centre DETECXE : 256 / Detector X-axis End pixel number DETECXS : 1 / Detector X-axis Start pixel number DETECYE : 256 / Detector Y-axis End pixel number DETECYS : 1 / Detector Y-axis Start pixel number N_INT : 150 / Number of integration cycles TIME_INT: 4.002200E-01 / Integration time OBS_MODE: 1 / Observing mode WINDOXE : 256 / Window X-axis End pixel number WINDOXS : 1 / Window X-axis Start pixel number WINDOYE : 256 / Window Y-axis End pixel number WINDOYS : 1 / Window Y-axis Start pixel number MEANDEC : -1.2164870837264E+01 / Mean Declination (degrees) MEANRA : 2.1320614620216E+02 / Mean RA (degrees) OFFDEC : 0.0000000000000E+00 / Offset in Declination (degrees) OFFRA : 0.0000000000000E+00 / Offset in RA (degrees) HAEND : 2.0521624122655E+01 / End Hour Angle HASTART : 2.0504440325062E+01 / Start Hour Angle ZDEND : 5.1536689544242E+01 / Zenith distance at end ZDSTART : 5.1753811258788E+01 / Zenith distance at start STEND : '10:44:07 ' / End sidereal time STSTART : '10:43:05 ' / Start sidereal time UTEND : '05:08:39 ' / End time (UT) UTSTART : '05:07:37 ' / Start time (UT) UTDATE : '17-JUL-94 ' / UT Date from telescope database WINDOW : 'NONE ' / Window File name IR_APER : ' ' / Entrance aperture IR_UFILT: 'CLEAR ' / Upper filter IR_UTILY: 'SLOWCAM ' / Utility wheel IR_LFILT: 'ICE ' / Lower filter IR_LENS : 'CLEAR ' / Lens EQUINOX : 'APPARENT ' / Equinox of mean coordinate system COSDEC : 0 / OFFRA is in degrees on sky (not / polar axis) POS_ANG : 1.7885000000000E+02 / Position Angle (degrees) METHOD : 2 / CASPIR ABSOLUTE OBSMODE : 1 / Observing mode AIRMASS : 1.6130049228668E+00 / Airmass EXPOSURE: 1. / All images scaled to 1 sec exposure RED : 'ldsc ' END   Software : Standard IRAF reduction routines were used. The RED keyword is an acronym for the process. The HISTORY comments list the process.   Media/Format : This dataset is an electronic submission to PDS which was referenced in the McGregor et al. (1996) [MCGREGORETAL1996] article.
DATA_SET_RELEASE_DATE 1996-08-14T00:00:00.000Z
START_TIME 1994-07-17T02:04:17.000Z
STOP_TIME 1994-07-22T12:00:39.000Z
MISSION_NAME COMET SL9/JUPITER COLLISION
MISSION_START_DATE 1993-01-01T12:00:00.000Z
MISSION_STOP_DATE 1996-01-01T12:00:00.000Z
TARGET_NAME SL9
JUPITER
TARGET_TYPE COMET
PLANET
INSTRUMENT_HOST_ID MSSSO
INSTRUMENT_NAME CRYOGENIC ARRAY SPECTROMETER/IMAGER
INSTRUMENT_ID CASPIR
INSTRUMENT_TYPE INFRARED IMAGING SPECTROMETER
NODE_NAME Small Bodies
ARCHIVE_STATUS ARCHIVED
CONFIDENCE_LEVEL_NOTE
UNK
CITATION_DESCRIPTION Citation TBD
ABSTRACT_TEXT This archive contains star images used as calibrations in preparation for the collision of Comet Shoemaker-Levy 9 with Jupiter obtained with CASPIR on the Australian National University 2.3 m telescope at Siding Spring Observatory, Australia, by Peter J. McGregor and Mark G. Allen. Each subdirectory contains data for one night. A more specific description of the state of the data is given below.
PRODUCER_FULL_NAME DR. PETER MCGREGOR
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