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. 4-1