Data Set Overview
  =================
 
  Hayabusa is a Japanese space mission to the asteroid 25143 Itokawa, launched
  on May 9, 2003 and with a planned return to Earth in June 2010.  The
  Asteroid Multi-band Imaging Camera (AMICA) is a charge-coupled device (CCD)
  camera with a refractive telescope producing an effective field of view of
  5.83 x 5.69 degrees.  In the course of the mission, AMICA obtained 1662
  images which are included in this data set.  For information about the
  design, performance and calibration of the AMICA camera, see Ishiguro et al.
  (2010).
 
 
  Data file types and contents
  ============================
 
  The data directories and their contents are as follows:
 
  data/yyyymmdd - The flight images are FITS files and are grouped into daily
  directories named with the date the images were obtained.  The file naming
  convention is [T][C]_[nnnnnnnnnn]_[filter].fit, where [T] is the data type
  (S for scientific and N for navigation), [C] is the name of the instrument
  (T for AMICA), [nnnnnnnnnn] is the mission elapsed time when the images were
  generated on the digital signal processing unit, and [filter] is the filter
  identifier.
 
  data/preflight - The pre-flight flat field images, one for each of the eight
  filters, are FITS images with the file naming convention flat_[filter].fit,
  where [filter] is the filter identifier. The flats for the ul, b, v, x, zs,
  and wide filters were obtained using an integrating sphere at NEC Toshiba
  Space Systems Ltd. at room temperature (around 30 degrees C). The flats for
  the w and p filters were obtained using a portable integrating sphere.  For
  additional information about the pre-flight and in-flight flats see Ishiguro
  et al. (2010).
 
  data/filters - The filter profiles in transmittance vs. wavelength for the
  seven narrow-band filters have filenaming convention [filter].tab.  A filter
  profile for the wide filter was not supplied by the project.
 
  data/parameters - Two files listing illumination and geometry parameters for
  the AMICA images are included here, one with parameters calculated from the
  Hayabusa LIDAR data, and one with the same parameters calculated from the
  Itokawa stereophotoclinometry provided by Bob Gaskell.  Both sets of
  parameters were calculated by Olivier S. Barnouin-Jha.  Each file contains
  parameters for a subset of the images.
 
  Geometry keywords in the image labels
  -------------------------------------
 
  The parameters given in data/parameters are also given in keywords in the
  labels of the individual images.  Since the stereophotoclinometry-derived
  parameters are more accurate than the LIDAR-derived parameters, the
  stereophotoclinometry-derived parameters are used in the labels for those
  images which have them.  The LIDAR-derived parameters are used only for
  those images which lack stereophotoclinometry-derived parameters.  For some
  images, it was not possible to calculate the parameters, and the geometry
  keywords don't appear in their labels.
 
  Alignment comparison
  --------------------
 
  Two documents prepared by Olivier Barnouin-Jha, alignment_lidar.pdf and
  alignment_stereo.pdf, show the alignment of the Itokawa shape model with the
  AMICA images, based on LIDAR and the stereophotoclinometry respectively, and
  demonstrate the reliability of the lidar-based and
  stereophotoclinometry-based geometry parameters.  These documents are
  provided in the document directory.
 
 
  Reference
  =========
 
  Ishiguro, M., R. Nakamura, D.J. Tholen, N. Hirata, H. Demura, E. Nemoto,
  A.M. Nakamura, Y. Higuchi, A. Sogame, A. Yamamoto, K. Kitazato, Y. Yokota,
  T. Kubota, T. Hashimoto, and J. Saito, The Hayabusa Spacecraft Asteroid
  Multi-Band Imaging Camera: AMICA, Icarus (2010), doi:
  10.1016/j.icarus.2009.12.035, 2010.

Confidence Level Overview
  =========================
    Image time uncertainty:  The UT times listed in the FITS headers are
    end-of-exposure times and have an uncertainty of +/- 12 seconds due to the
    periodicity of the control and operation of the analog signal processing
    unit.  This uncertainty applies also to the start and stop times listed in
    the PDS label, which were derived from the end times and exposure times in
    the FITS header.
 
    Missing image times:  Observation times could not be obtained for three
    images, 20040106/ST_0670995301_b.fit, 20040601/ST_1076261287_b.fit, and
    20040526/ST_1059672071_b.fit.  The times in the FITS header and PDS label
    were determined by interpolating between the times of the images taken
    immediately before and after.
 
    Dual target images:  Four images obtained on August 29, 2005 contain both
    the asteroid 25143 Itokawa and the star Alpha Leonis.  These images are
    ST_2332479491_v.fit, ST_2332498721_wide.fit, ST_2332786728_wide.fit, and
    ST_2332825189_v.fit.