Index of /volume/hal_0021
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aareadme.txt 16-Jan-1992 23:00 7.0K
acknwldg.txt 16-Jan-1992 23:00 21K
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voldesc.sfd 19-Jan-1992 23:00 39K
vtoc.sys 24-Feb-1992 23:00 4.0K
***** File AAREADME.TXT
This compact disc (CD-ROM) is one of a 5-disc set containing digital data
obtained through the efforts of all the International Halley Watch (IHW)
Disciplines and their corresponding Networks. Because of their
multi-Discipline composition, the five discs, which are Volumes 19-23 in the
total set of IHW CD-ROMs, have become known informally as the "mixed discs."
Volumes 1-18 are dedicated to the Large-Scale Phenomena Discipline and its
very large image files, which have been deposited on disc in compressed form.
Finally, Volume 24 contains data from the IHW "Trial Run" targets--comets
P/Crommelin and Giacobini-Zinner--and Volumes 25-26 are devoted to space data
returned by the Halley intercept spacecraft and the International Cometary
Explorer (ICE).
In addition to the data themselves, this disc contains a wide variety of
supporting files and tools for the Archive user; the major categories are
documentation, ephemeris information, searchable tables and indices, and
software (source code as well as executable modules). These have been
organized into four principal directories one level below the root: DOCUMENT,
EPHEM, INDEX, and SOFTWARE. It is suggested that the Archive user review the
document files listed below before roaming through the multi-level data
directories:
\DOCUMENT\HALGUIDE.TXT Brief guide to use of discs
\DOCUMENT\CDTREE.TXT Schematic, annotated layout of disc
\DOCUMENT\VOLINFO.TXT More complete description of disc, history
of IHW CD-ROM generation
\DOCUMENT\APPENDIX\*.APX Appendices for (all) nine IHW Disciplines
\INDEX\INDXINFO.TXT Description of basic indices
\INDEX\NETABLES\NETINFO.TXT Description of "printed archive" and
Discipline-specific indices
\SOFTWARE\SOFTINFO.TXT Brief enumeration of software on disc
The time period covered by this disc is Feburary 10, 1986 through April
13, 1986 inclusive. Data from all nine IHW Disciplines, except Meteor
Studies, are included (the Meteor data are contained on the last "mixed disc,"
Volume 23). Astrometry data from the previous apparitions of 1835 and 1910
have been put on this disc, as well as data from the "current" (1985-86)
apparition.
Data preparation for the IHW Archive has been the work of many people
within each Discipline, of the Lead Center personnel at JPL, and of those at
NASA/GSFC who actually generated the CD-ROMs. Efforts at the Discipline level
are described in the Appendix files in the \DOCUMENT\APPENDIX directory, and a
history of IHW CD-ROM generation is given in the ACKNWLDG.TXT file of the root
directory. Although many people have been involved in this project (including
the observers), the individuals listed below were responsible for actually
making the discs and they accept responsibility for any errors in disc format
and/or layout, but not actual file content.
All of the text files on this disc have fixed length records padded to
either 80 or 132 bytes per record. The last two characters of each record are
a carriage return and line feed. This has been done to files with the
following extensions (*.txt, *.str, *.apx, and *.lbl).
M. Niedner, Jr. E. Grayzeck, Jr.
IHW Discipline Specialist Small Bodies Node of
for Large-Scale Phenomena Planetary Data System
Laboratory for Astronomy Astronomy Department
and Solar Physics University of Maryland
Code 684.1 College Park, MD 20742
NASA/GSFC
Greenbelt, MD 20771
D. Klinglesmith III A. Warnock III
IHW Team Member for IHW Team Member for
Large-Scale Phenomena Large-Scale Phenomena
Laboratory for Astronomy ST Systems Corp.
and Solar Physics Code 681
Code 684.0 NASA/GSFC
NASA/GSFC Greenbelt, MD 20771
Greenbelt, MD 20771
M. Aronsson
IHW Lead Center
Jet Propulsion Laboratory
MS 169-237
4800 Oak Grove Dr.
Pasadena, CA
91109