PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM OBJECT = TEXT PUBLICATION_DATE = 2010-03-02 /* Label Generated */ NOTE = "Description of the contents of the document directory." END_OBJECT = TEXT END "document" Directory Contents The document directory contains documentation files, where available, for the data set in this volume. All document files will have an accompanying label file to describe content and structure. Label files have the same name as the main document file, with an extension of ".lbl". docinfo.txt - The file you are reading. ads.asc - This is an internal file of bibliographic information to be sent by PDS to the Abstract Data Service (ADS) to list this data set in their service. This file is not intended to be useful to data users. ads.lbl - The label for ads.asc. alignment_lidar.pdf - "Alignment of the Itokawa Shape Model with AMICA Observations using navigation solutions from Laser Altimetry", This document, by Olivier Barnouin-Jha, shows how well altimetry acquired by the Hayabusa spacecraft permits determining the approximate trajectory of the Hayabusa spacecraft relative to Itokawa. We show here all the 1024 x 1024 AMICA images acquired during Hayabusa's encounter with Itokawa where the laser altimeter was in range of the surface of the asteroid. The approximate location of the shape model given this trajectory is shown in green with a white outline an is overlain on the grey observed asteroid. The pointing solutions and orbits employed to outline these shape models on the Hayabusa images provide the ancillary data that are part of the AMICA data delivered to the Planetary Data System. This file indicates that for most images present, the ancillary data will be quite good (within 10m or so of their actual location). The methodology employed to determine the location of the spacecraft is not suitable when there is no laser altimetry data available, and when the asteroid fills the entire field of view of the Wide Angle camera used for navigation by Hayabusa. (See the figures on the last two pages of this document for examples of bad data.) We expect that AMICA images that are smaller than the 1024 x 1024 image size will still possess good ancillary data as long as they do not possess the above two conditions. However, we were not able to model these as we do not understand which subsets of the AMICA image frame were extracted to make these smaller images. alignment_lidar.lbl - The label file for the document "Alignment of the Itokawa Shape Model with AMICA Observations using navigation solutions from Laser Altimetry" described above. alignment_stereo.pdf - "Alignment of the Itokawa Shape Model with AMICA Observations using Laser Altimetry and Optical Navigation", This document, by Olivier S. Barnouin-Jha and Robert Gaskell, shows how well a combination of laser altimetry and optical navigation acquired by the HAYABUSA spacecraft pemits determining the approximate trajectory of the Hayabusa spaceraft relative to the asteroid Itokawa. We show here all the 1024 x 1024 AMICA images acquired during the Hayabusa?s encounter with Itokawa that were employed to develop the most recent shape models of this asteroid. These data were also used to derive the trajectory of the spacecraft. The expected approximate location of the asteroid given this trajectory is shown in green with a white outline and is overlain on the gray observed asteroid. The pointing solutions and orbits employed to outline these shape models on the HAYABUSA images provide the ancillary data that are part of the AMICA data delivered to the Planetary Data System. This file indicates that for most images present, the ancillary data is very good (within 1m or so of their actual location and pointing). The methodolgy here, which uses both the Laser Altimetry and Optical navigation data di?ers from the one that depends only on Laser Altimetry, which is the source of the laser altimetry derived spacecraft trajectory ?les delivered to the PDS for Hayabusa. The latter, while slightly less accurate, is better than the data presented here for when AMICA images are not collected, since none of the wide angle images could be sent to the ground during the encounter of HAYABUSA with Itokawa. The black diamond in each image indicates the location of the altimeters footprint on the surface of the asteroid. alignment_stereo.lbl - The label file for the document "Alignment of the Itokawa Shape Model with AMICA Observations using Laser Altimetry and Optical Navigation" described above. amicaobslog.asc - "Hayabusa AMICA Observation Log", This observation log was downloaded from the Japan Aerospace Exploration Agency (JAXA) Hayabusa Data Archive web site (http://www.jaxa.jp/index_e.html) on March 7, 2008. It has not been modified by PDS and may contain errors. It is intended to provide basic information about the Hayabusa AMICA images, and is included as provided by JAXA as a convenience for the user. amicaobslog.lbl - The label file for the document "Hayabusa AMICA Observation Log" described above.