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Text File  |  1993-10-02  |  21KB  |  252 lines
  1. SIMPLE  =                    T / Standard FITS format                           
  2. BITPIX  =                    8 / Character Information                          
  3. NAXIS   =                    0 / No image data array present                    
  4. EXTEND  =                    T / Extension exists                               
  5. FILETYPE= 'SM_REG_X'           / Indicates file type                            
  6. ORIGIN  = 'ST ScI  '           / Space Telescope Science Institute              
  7. DATE    = '01/06/89'           / Date of issue (dd/mm/yy)                       
  8.                                                                                 
  9. COMMENT                          THE GUIDE STAR CATALOG                         
  10. COMMENT                                                                         
  11. COMMENT              An all-sky astrometric and photometric catalog             
  12. COMMENT              prepared for the operation of the Hubble Space             
  13. COMMENT                                Telescope.                               
  14. COMMENT                                                                         
  15. COMMENT              Copyright,  1989,  Association of Universities             
  16. COMMENT                      for Research in Astronomy, Inc.                    
  17. COMMENT                                                                         
  18. COMMENT This  file  contains data for one of the supporting tables for the Guide
  19. COMMENT Star Catalog (GSC).  Additional information on the GSC may be  found  in
  20. COMMENT accompanying  scientific  publications as well as in comments and tables
  21. COMMENT elsewhere on this set of volumes.                                       
  22. COMMENT                                                                         
  23. COMMENT The Guide Star Catalog (GSC) was prepared by the Space Telescope Science
  24. COMMENT Institute (ST ScI),  3700 San Martin Drive,  Baltimore,  MD 21218,  USA.
  25. COMMENT ST ScI  is  operated  by the Association of Universities for Research in
  26. COMMENT Astronomy, Inc. (AURA), under contract with the National Aeronautics and
  27. COMMENT Space Administration (NASA).                                            
  28. COMMENT                                                                         
  29. COMMENT                                                                         
  30. COMMENT                              File SM_REG_X                              
  31. COMMENT                        Index to the Small Regions                       
  32. COMMENT                                                                         
  33. COMMENT The  adopted  catalog  organization  divides the sky into large regions,
  34. COMMENT approximately 7.5 deg in size, which  are  then  subdivided  into  small
  35. COMMENT regions  on  the basis of their expected individual stellar populations;
  36. COMMENT each small region corresponds to one file of the GSC.  Some details  are
  37. COMMENT given in the comments to file REGIONS; and a full description, including
  38. COMMENT the region counting rules, may be found in Paper III.                   
  39. COMMENT                                                                         
  40. COMMENT All  information  needed  to  associate a point on the sky with a region
  41. COMMENT file is given in file REGIONS.  However, files  LR_REG_X,  which  is  an
  42. COMMENT index to the large regions, and SM_REG_X, which is an index to the small
  43. COMMENT regions,  are provided to support a more rapid search algorithm based on
  44. COMMENT the  geometric  arrangement  of  the regions and their numbering conven-
  45. COMMENT tions.                                                                  
  46. COMMENT                                                                         
  47. COMMENT File  LG_REG_X  gives,  for each declination band DEC_CTR, the number of
  48. COMMENT the first large region F_LG_REG in the band  and  the  number  of  large
  49. COMMENT regions N_LG_REG therein. Similarly, file SM_REG_X gives, for each large
  50. COMMENT region  LG_REG_N,  the number F_SM_REG of the first small region and the
  51. COMMENT level  of  subdivision  of  the  large  region  DEPTH.   Then,  for  any
  52. COMMENT coordinate,  two  simple  indexing procedures are sufficient to identify
  53. COMMENT the large region number and then, obtaining  the  level  to  which  that
  54. COMMENT region  is  subdivided  from  the  small  region table, the small region
  55. COMMENT number which bears a one-to-one correspondence with the name  of  a  GSC
  56. COMMENT file.  One need also to note that the first large region in the southern
  57. COMMENT hemisphere is 367.                                                      
  58.                                                                                 
  59. END                                                                             
  60.                                                                                 
  61.                                                                                 
  62.                                                                                 
  63.                                                                                 
  64.                                                                                 
  65.                                                                                 
  66.                                                                                 
  67.                                                                                 
  68.                                                                                 
  69.                                                                                 
  70.                                                                                 
  71.                                                                                 
  72.                                                                                 
  73. XTENSION= 'TABLE   '           / Table Extension                                
  74. BITPIX  =                    8 / Character Information                          
  75. NAXIS   =                    2 / Two-dimensional table                          
  76. NAXIS1  =                   12 / Number of characters per line                  
  77. NAXIS2  =                  732 / Number of rows                                 
  78. PCOUNT  =                    0 / No Random Parameters                           
  79. GCOUNT  =                    1 / Only one group                                 
  80. TFIELDS =                    3 / Three fields per row                           
  81.                                                                                 
  82. EXTNAME = 'SM_REG_X'           / Small Region Index File                        
  83. EXTVER  =                    1 / Integer Version Number                         
  84.                                                                                 
  85. TTYPE1  = 'LG_REG_N'           / Number (ID) of the Large Region                
  86. TBCOL1  =                    1 / Start in column 1                              
  87. TFORM1  = 'I3      '           / Integer, 3 Character Field                     
  88.                                                                                 
  89. TTYPE2  = 'F_SM_REG'           / Number (ID) of first Small Region in Lg. Reg.  
  90. TBCOL2  =                    5 / Start in column 5                              
  91. TFORM2  = 'I5      '           / Integer, 5 Character Field                     
  92.                                                                                 
  93. TTYPE3  = 'DEPTH   '           / Depth of Subdivision of Large Region           
  94. TBCOL3  =                   12 / Start in column 12                             
  95. TFORM3  = 'I1      '           / Integer, 1 Character Field                     
  96.                                                                                 
  97. END                                                                             
  98.                                                                                 
  99.                                                                                 
  100.