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V/51        Data Inventory of Space-Based Obs, Ver 1.1 (Brotzman+ 1987)
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Data Inventory of Space-Based Celestial Observations, Version 1.1
    Brotzman L.E., Hill R.S., Mead J.M.
    <ADC Bull. 1, 312 (1987)>
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ADC_Keywords: References; Space observations

Description:
   The "Data Inventory of Space-Based Celestial Observations Version
   1.0" (DISCO) is a directory to data contained in sixteen catalogs
   dealing with observations from space.  (Sounding rocket, solar, and
   planetary observations have been excluded.) The information
   extracted from the catalogs includes names of objects observed, 1950
   equatorial coordinates, and the name of the catalog or instrument. A
   second file contains full references to the source catalogs and
   other pertinent information. 
   The purpose of creating DISCO is (1) to unify astronomical
   observations from space, which are at present scattered and hard to
   locate, and then (2) to provide a machine-readable index to these
   observations, thus enabling easy access by computer.  Such a
   directory will permit an astronomer to find out what objects have
   been observed from space, which spacecraft and instruments made the
   observations, and where to go to find the data themselves. 

File Summary:
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  FileName      Lrecl  Records   Explanations
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ReadMe             80        .   This file
disco.dat         118    74821   Catalog Data
refs.dat           80      131   References
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Byte-by-byte Description of file: disco.dat
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   Bytes  Format   Units   Label     Explanations
--------------------------------------------------------------------------------
   1- 15   A15     ---     PID      *Primary or "mission" id    
  16- 30   A15     ---     SID      *Secondary id               
  31- 45   A15     ---     TID      *Tertiary id                
  46- 48   I3      h       RAh      *RA hours                    
  49- 51   I3      min     RAm      *RA minutes                  
  52- 57   F6.2    s       RAs      *[0.,60.] RA seconds                
  58- 59   I2      ---     RAp      *RA precision                
  61       A1      ---     DE-       Sign of dec                 
  62- 63   I2      deg     DEdeg     Dec degrees                 
  64- 66   I3      arcmin  DEm       Dec arc minutes             
  67- 72   F6.2    arcsec  DEs      [0.,60.] Dec arc seconds           
  73- 74   I2      ---     DEp      *Dec precision               
  75- 78   I4      ---     CRefNum  *Coordinate reference number 
  80-114   A35     ---     Cat      *Mission or catalog         
 115-118   I4      ---     PRefNum  *Primary reference number    
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Note on PID, SID, TID:
  Space is provided for three object identifiers.  The identifiers are listed
  according to the following priority:  (1) "Mission id", (2) HD or NGC, (3)
  other. Namely, (1) Primary id, (2) Secondary, and (3) Tertiary id. 
Note on RAh, RAm, RAs:
  Equatorial coordinates, equinox 1950.0.  Some of the original catalogs do
  not have coordinates, in which case coordinates have been obtained from a
  standard ground-based catalog.  See coord reference below. 
Note on RAp:
  RA precision. Number of digits  HH MM SS.SS given in the source catalog; for
  example, 6 is the code for whole numbers of seconds. 
Note on DEp:
  DEC precision.  Number of digits  DD MM SS.SS given in the source catalog;
  for example, 8 is the code for hundredths of seconds. 
Note on CRefNum:
  Coord reference. Reference number for the source of coordinates, as
  given in the reference file; see refs.dat.
Note on Cat:
  Mission or catalog. Identification of the satellite or instrument that  
  observed the object or the name of the catalog from which the data were
  taken. 
Note on PRefNum:
  Primary reference. Reference number for the primary source of information, 
  as given in the reference file; see refs.dat below.

Byte-by-byte Description of file: refs.dat
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   Bytes  Format  Units   Label     Explanations
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   1-  3   I3     ---     RefNum   *? Reference number           
   5-  8   A4     ---     StatNum  *ADC Status Report number     
  10- 18   A9     ---     SCAbbr   *Satellite or catalog abbrev. 
  19- 23   I5     ---     Rcount   *? Record count                 
  25- 80   A56    ---     Ref      *Reference                   
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Note on RefNum:
  Reference number. The number given the catalog when compiled into the DISCO.
  If this field is blank, the record is a continuation of the previous
  record.  If the reference number is greater than or equal to 100, the refer-
  enced catalog was used only to find coordinates of objects. 
Note on StatNum:
  Status Report no. The number under which the catalog may be located in
  the ADC Status Report.  
Note on SCAbbr:
  This is the abbreviation given the satellite or catalog by ADC personnel.  
Note on Rcount:
  Record count. The number of records from this reference that can be found in
  DISCO. 
Note on Ref:
  Reference. This field includes the full title and reference of the original
  paper that presented the data; or the name of a catalog used for coordinates
  only if the reference number is greater than 100 (see above). See the
  description for bytes 75-78 and 115-118 in disco.dat. 

History and Remarks:
  The ReadMe file incorporates the original ADC documentation by Brotzman,
  Hill, and Mead (1986).
  "The Data Inventory of Space-Based Celestial Observations" (DISCO) was
  produced at the Astronomical Data Center (ADC), NASA Goddard Space Flight
  Center. 
  A search through the ADC Status Report was conducted for all catalogs
  containing data from satellite observations.  Individual Fortran programs
  were written that produced a DISCO "submaster" from each catalog.  The
  submasters were then merged and sorted by equatorial coordinates.  In some
  cases, the input catalogs were edited with Fortran programs or a text editor
  to produce a preliminary dataset that was more amenable to conversion to
  DISCO format.  In addition, coordinates were obtained from ground-based
  catalogs for objects that do not have them in the original space-based lists
  (see the description of the coordinate reference in "Main Inventory File
  disco.dat above). Complete versions of the catalogs represented in DISCO
  are available from the ADC. 

Reference:
  Brotzman, L. E., Hill, R. S., Mead, J. M.  1986, Astronomical Data
   Center Bulletin (in publication).
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(End)                        C.-H. Joseph Lyu [Hughes STX/NASA]  16-Aug-1995