Deep Impact 9P/Tempel Encounter - Calibrated Navigation Images from the High-Resolution Visible CCD (HRIV)

Status: Archived

This data set contains calibrated images of comet 9P/Tempel 1 acquired by the Deep Impact High Resolution Instrument Visible CCD (HRIV) during the encounter phase of the mission. These observations were used for optical and autonomous navigation (NAV) of the flyby spacecraft as well as for scientific investigations. These data were collected on 3-4 July 2005.

The entire data set has been gathered into one physical volume (an ISO image) for downloading. It includes includes all catalog, index, suport, and calibration files for the data set.

• DIHVNV_3001 - data for July 3-4/DOY 184-185   (1.6 GB ISO file)
• Catalog, index, support, and calibration files for the entire data set are available separately for downloading:
  • Catalog, index, and support files (331 KB ZIP file)
  • Calibration files (25 MB tar file)
• MD5 checksums for the above files

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... 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-VCCD 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

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

• abscalvs - Lookup tables of VIS absolute calibration constants for each filter
• 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 - Bias correction maps for each instrument mode
• drkmodel - Master dark frames for each instrument mode
• filters - Transmission profile table for each filter
• flat - Flat fields for each instrument mode and filter combination
• gain - Gain correction maps for each instrument mode
• psf - Point-spread function for each filter for deconvolution
• xtalk - Electronic cross-talk gain tables for each instrument mode

Data Files

The data are divided by mid-observation date, with subdirectories named by sequential day number under the data/radrev/2005 subdirectory. These reversible, calibrated data (RADREV) have units of radiance, W/[m**2 sr um].

Index Files

The index/ directory contains the required PDS index into the data files in the data directory, as well as the checksum file.

• indxinfo.txt describes the directory contents.
• index.tab is a CSV table meeting the PDS indexing requirements. (PDS label)
• checksum.tab is flat table of MD5 checksums for each file in the official archive volume except for itself and its PDS label.