Deep Impact 9P/Tempel Encounter Calibrated HRII High-Resolution IR Spectral Images

Status: Archived

This volume contains version 2.0 of calibrated spectral images of comet 9P/Tempel 1 acquired by the Deep Impact High Resolution Instrument Infrared Spectrometer (HRII) during the encounter phase of the mission. These data were collected from June 20 through July 6, 2005 (day of year 171 through 187). The impact with 9P/Tempel 1 occurred on July 4, 2005.

Version 2.0 includes improved calibration and geometry, and two types of reduced data RADREV (units of radiance, not cleaned and reversible), and RAD (units of radiance, cleaned). Only RADREV data were included in version 1.0.

The observational data have been broken into physical volumes by reduction type (RADREV and RAD) for downloading. Each volume includes catalog, index, calibration, and support files.

• DIHI9P_3101 - RADREV data for June 20-July 1/DOY 171-182   (2.9 GB ISO file)
• DIHI9P_3102 - RADREV data for July 2-July3/DOY 183-184   (4.4 GB ISO file)
• DIHI9P_3103 - RADREV data for July 3/DOY 184   (4.3 GB ISO file)
• DIHI9P_3104 - RADREV data for July 4-July 6/DOY 185-187   (3.9 GB ISO file)
• DIHI9P_3105 - RAD data for June 20-July 1/DOY 171-182   (2.8 GB ISO file)
• DIHI9P_3106 - RAD data for July 2-July3/DOY 183-184   (4.3 GB ISO file)
• DIHI9P_3107 - RAD data for July 3/DOY 184   (4.2 GB ISO file)
• DIHI9P_3108 - RAD data for July 4-July 6/DOY 185-187   (3.8 GB ISO file)

• MD5 checksums for the above files

Catalog, index, support, and calibration files for the entire data set are available separately for downloading:

• Catalog, index, and support files (3.3 MB ZIP file)
• RADREV Browse files (261 MB tar file)
• Calibration files (170 MB tar file)

The Deep Impact Documentation volume is available as a separate download file:

• Deep Impact Documentation volume (80 MB zip file)

In case you're wondering... How to download large files What to do with an ISO file What to do with a checksum

An overview of the volume contents is provided in the aareadme.txt file.

Catalog Files

Catalog files contain the overview information and parameters used in loading the PDS central catalog, specifically, or for developing other interfaces to the data outside of PDS. The information they contain, particularly in their descriptive text fields, should be clear, complete, and understandable to a research user who is not necessarily a mission or instrument specialist.

These files are located in the catalog/ subdirectory. The directory contents are described by the catinfo.txt file.

• Deep Impact mission file
• Fly-by Spacecraft instrument host file
• HRI-IR instrument file
• Data Set file
• Target catalog files, containing very brief definitions of the various TARGET_NAME values found in the PDS labels for the data:
  • 9P/Tempel 1 target file
• References file
• Personnel file

Documentation Files

The documentation for the Deep Impact mission has been collected into a separate volume. The root of this volume is here. The contents are described in the aareadme file in the root of the documentation volume.

Calibration Files

This directory, calib/, contains the files used to calibrate the raw HRII data of comet 9P/Tempel 1. The calibration files are grouped into the following subdirectories and are briefly describe in the calinfo.txt file.

• abscalir - Lookup tables of IR absolute calibration constants
• adclut - Dummy table to correct for ADC uneven bit weighting (input values equal output values; required by the calibration pipeline)
• badpix - Bad pixel maps for each instrument mode
• bias - Dummy bias frames (all zeros) for each instrument mode (required by the calibration pipeline)
• dark - Dark frames for specific exposure IDs
• decomprs - Lossy lookup tables, numbered from 0 to 3, used to decompress raw data files that were compressed on board the spacecraft
• drkmodel - Master dark frames for each instrument mode
• flat - Flat fields derived from linearity; some are dummy flats (all ones) are required by the calibration pipeline
• lindn - Maps providing the linearization coefficients for each instrument mode
• psf - Dummy point-spread function files for each instrument mode (required by the calibration pipeline)
• specmap - Temperature-dependent, spectral maps for each instrument mode
• sunspec - Tables providing the solar spectral irradiance at 1 AU for the given wavelengths
• xtalk - Dummy electronic cross-talk gain tables (all zeros) for each instrument mode (required by the calibration pipeline)

Data Files

The FITS image data are grouped by reduction type, then by date of observation with subdirectories named by sequential day number:

• RADREV data were reversibly calibrated, but were not cleaned, and have units of radiance W/(m**2 um sr).
• RAD data were cleaned and have units of radiance W/(m**2 um sr).

The RAD data were partially cleaned: bad and missing pixels were interplated over but cosmic rays were not removed.

Browse Facility

The browse directory is a web site that provides an easy method for viewing JPEG versions of the RADREV data products in the data/ directory. An HTML main page links to daily HTML files which display thumbnails and full-frame JPEGs for each data product. The root of this directory is here.

• browinfo.txt describes the directory contents.
• browse.htm is the entry point for the browse facility. (PDS label)

Index Files

This directory contains indices into the data in the data/ directory.

• indxinfo.txt describes the directory contents.
• index.tab is a CSV table meeting the PDS indexing requirements. (PDS label)