R-SAW-7/79-05











              DOCUMENTATION FOR THE MACHINE-READABLE VERSION
                       OF THE SECOND ARIEL CATALOGUE




                                 July 1979



                           Contract  NAS 5-25369




                              Theresa A. Nagy










                               Prepared for:

               National Aeronautics and Space Administration
                        Goddard Space Flight Center
                        Greenbelt, Maryland  20771







                               Prepared by:

                 Systems and Applied Sciences Corporation
                          6811 Kenilworth Avenue
                        Riverdale, Maryland  20840

                      SECTION 1 - INTRODUCTION



In recent years there has been a trend away from publishing catalogues in book
form to preparing catalogues by computer and distributing them on magnetic
tape, with appearance in book form a secondary occurrence.  This memo is the
result of the development of the documentation for the machine-readable version
of the catalogue and includes the basic information given in the original
preface of the published catalogue.  This memo should be distributed along with
any copy of the machine-readable version of the catalogue.












































                                      1-1
                      SECTION 2 - FILE CONTENTS



A byte-by-byte description of the contents of the catalogue is given in Table
2-1.  The information in the "Description" column is derived mainly from the
published version of the catalogue whenever possible.  The "Suggested Format"
column is for FORTRAN-formatted reads.

Table 2-1. File Contents:  SECOND ARIEL CATALOGUE


                                                                  Suggested
Bytes                         Description                          Format

 1-12          Name of celestial source                            12A1

13-22          Right Ascension (1950.0) (unit = degrees)           F10.4

23-32          Declination (1950.0) (unit = degrees)               F10.4

33-40          X-ray intensity (where applicable in units           8A1
               of given detector)

41-80          Comments                                             40A1






























                                      2-1
                  SECTION 3 - FILE CHARACTERISTICS



The information contained in this section is sufficient for the user to read
the machine-readable version of the catalogue.  The statistics of the contents
of the entire file are given in Table 3-1.

Table 3-1.  File Characteristics: SECOND ARIEL CATALOGUE

CATALOGUE                                           2A

NUMBER OF FILES                                     1

LOGICAL RECORD LENGTH (BYTES)                       80

RECORD FORMAT (IBM OS/JCL)                          Fixed

TOTAL NUMBER OF LOGICAL RECORDS                     107                




































                                      3-1
                SECTION 4 - REMARKS AND MODIFICATIONS



The Second Ariel Catalogue (B.  A. Cooke, M. J. Ricketts, T. Maccacaro, J. P.
Pye, M. Elvis, M. G. Watson, R. E. Griffiths, K. A. Pounds, I. McHardy, D.
Maccagni, F. D. Seward, C. G. Page and M. J. L. Turner, 1978 Monthly Notices of
the Royal Astronomical Society, 182, 489-515) has been made machine-readable by
G. Share (Naval Research Laboratory).  The information given in this document
has been obtained via private communication with Dr.  Share.  No effort has
been expended to verify the contents and Dr.  Share bears the responsibility
for any keypunching errors.











































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