I/208  90000 Stars Supplement to the PPM Star Catalogue (Roeser+ 1994)
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The 90000 Stars Supplement to the PPM Star Catalogue
     Roeser S., Bastian U., Kuzmin A.V.
     
     =1994A&AS..105..301R
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ADC_Keywords: Positional data; Proper motions

Description:
      Since its appearance in 1966, the SAO Catalogue (SAO, 1966) has
      been the primary source for stellar positions and proper motions.
      Typical values for the rms errors are 1 arcsec in the positions
      at epoch 1990, and 1.5 arcsec/century in the proper motions.  The
      corresponding figures for the AGK3 (Heckmann et al., 1975) on the
      northern hemisphere are 0.45 arcsec and 0.9 arcsec/century.
      Common to both catalogues is the fact that proper motions area
      derived from two observational epochs only. Both catalogues are
      nominally on the B1950/FK4 coordinate system.

      The PPM Star Catalogue (Roeser and Bastian, 1991, Bastian et al.,    
      1993; for a short description see Roeser and Bastian, 1993)
      effectively replaced these catalogues by providing more precise
      astrometric data for more stars on the J2000/FK5 coordinate
      system.  Compared to the SAO Catalogue the improvement in
      precision is about a factor of 3 on the northern and a factor of
      6 to 10 on the southern hemisphere. In addition, the number of
      stars is increased by about 50 percent.  Typical values for the
      rms errors on the northern hemisphere are 0.27 arcsec in the
      positions at epoch 1990, and 0.42 arcsec/century in the proper
      motions. On the southern hemisphere PPM is much better, the
      corresponding figures being 0.11 arcsec and 0.30 arcsec/century.
      The improvement over the SAO Catalogue was made possible by the
      advent of new big catalogues of position measurements and by the
      inclusion of the century-old Astrographic Catalogue (AC) into the
      derivation of proper motions (for a description of AC see
      Eichhorn, 1974).  But even PPM does not fully exploit the
      treasure of photographic position measurements available in the
      astronomical literature of the last 100 years.
      The Astrographic Catalogue contains roughly four million stars
      that are not included in PPM.  For most of them no precise
      modern-epoch position measurements exist.  Thus it is not yet
      possible to derive proper motions with PPM quality for all AC
      stars.  But among the 4 million there is a subset of some 100,000
      CPC-2 stars that are not included in PPM.  These stars constitute 
      the 90,000 Stars Supplement to PPM.

File Summary:
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 FileName    Lrecl     Records     Explanations
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ReadMe          80           .     This file
ppm_supp.dat   131       89676     The catalogue
descrip.doc     78         261     Authors' description
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Byte-by-byte Description of file: ppm_supp.dat
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   Bytes Format  Units     Label    Explanations
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   2-  7  I6     ---       PPM     *[700001/789676]+ Designation of the star
  10- 18  A9     ---       DM      *BD (zones -02 to -22), else CD 
  20- 23  F4.1   mag       mag     *Magnitude
  25- 26  A2     ---       Sp      *Spectral type
  28- 29  I2     h         RAh      Right Ascension J2000 (hours)
  31- 32  I2     min       RAm      Right Ascension J2000 (minutes)
  34- 39  F6.3   s         RAs      Right Ascension J2000 (seconds)
      42  A1     ---       DE-      Declination J2000 (sign)
  43- 44  I2     deg       DEd      Declination J2000 (degrees)
  46- 47  I2     arcmin    DEm      Declination J2000 (minutes)
  49- 53  F5.2   arcsec    DEs      Declination J2000 (seconds)
  56- 62  F7.4   s/yr      pmRA    *Proper motion in RA, J2000
  64- 69  F6.3   arcsec/yr pmDE    *Proper motion in DE, J2000
  71- 72  I2     ---       N       *Number of individual published positions used
  74- 75  I2     10mas     e_RA    *Mean error of RA
  77- 78  I2     10mas     e_DE    *Mean error of DE
  80- 83  F4.1   mas/yr    e_pmRA  *Mean error of pmRA
  85- 88  F4.1   mas/yr    e_pmDE  *Mean error of pmDE
  90- 94  F5.2   yr        EpRA    *Weighted mean epoch, RA and pmRA 
  96-100  F5.2   yr        EpDE    *Weighted mean epoch, DE and pmDE
 102-107  I6     ---       SAO      [1/258997]?  SAO Designation 
 109-114  I6     ---       HD       [1/360000]?  Henry Draper Designation
 117-125  A9     ---       CPD      Cape Photographic Durchmustrung Designation
     127  A1     ---       Flag1   *'P' - problem, 'C' - comment 
     128  A1     ---       Flag2   *'D' - double star
     129  A1     ---       Flag3   *    - not used
     130  A1     ---       Flag4   *'F' - member of FK5     
     131  A1     ---       Flag5   *'R' - remark, 'V' - V mag (CPC-2)
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Note on PPM:
  Designation of the star in PPM South starting with No. 181732, 
  see chapter 3 of description file.

Note on DM:                       
  Designation of the star in the Bonner Durchmusterung (for zones from 
  -02 to -22 degrees) or in the Cordoba Durchmusterung (zones -23 to 
  -89 degrees).

Note on mag and Sp:
  See chapter 3 of description file.

Note on pmRA and pmDE:
  Proper motion in right ascension for epoch and equinox J2000.0,
  on the system of FK5 given in seconds of time per Julian year.
                                                       
Note on N:
  Number of individual published positions used for the 
  derivation of the position and proper motion given.

Note on e_RA:
  Mean error of right ascension at the mean epoch right ascension,
  multiplied by the cosine of declination, given in units
  of #0.01 seconds of arc.

Note on e_DE:
  Mean error of right ascension at the mean epoch of declination,
  given in units of #0.01 seconds of arc.

Note on e_pmRA: 
  Mean error of the proper motion in right ascension,
  multiplied by the cosine of declination, given in units 
  of 0.001 second of arc per Julian year.

Note on e_pmDE:
  Mean error of the proper motion in declination,
  given in units of 0.001 seconds of arc per Julian year.
                                                                
Note on EpRA:
  Weighted mean epoch of the measured positions used for the 
  derivation of RA and pmRA, given in years since 1900.0.

Note on EpDE:
  Weighted mean epoch of the measured positions used for the
  derivation of DE and pmDE, given in years since 1900.0.

Note on Flag1:
  P -  problem case, preferably not to be used as astrometric
       reference star.
  C - a critical comment is given in the List of Critical Comments.
      Not to be used as astrometric reference star.
                                                         
Note on Flag2:
  D - double star, preferably not to be used as astrometric 
      reference star.

Note on Flag3:
  Not used, void for consistency with PPM (north).

Note on Flag4:
  F - member of FK5, mostly bright stars, original FK5 data
      are given.

Note on Flag5:
  R -  a remark is given in the List of Remarks on Individual
       Stars.
  V -  the magnitude is a photographic V magnitude copied from
       CPC-2.
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References:
  Bastian, U., Roeser, S., et al., 1993, PPM Star Catalogue, Vols.
    III and IV, positions and proper motions of 197179 stars
    south of -2.5 degrees declination. Astronomisches Rechen-
    Institut, Heidelberg. Spektrum Akademischer Verlag,
    Heidelberg, Berlin, New York, 1993.
  Eichhorn, H., 1974, Astronomy of Star Positions, Frederick
    Ungar Publ. Co., New York.
  Heckmann, O., Dieckvoss, W., Kox, H., Guenther, A., Brosterhus, E.,
    1975, AGK3. Star catalogue of positions and proper
    motions north of -2.5 declination. Hamburg-Bergedorf 1975.
  Roeser, S., Bastian, U., 1991, PPM Star Catalogue, Vols. I and II,
    positions and proper motions of 181731 stars north of
    -2.5 degrees declination. Astronomisches Rechen-Institut,
    Heidelberg. Spektrum Akademischer Verlag, Heidelberg,
    Berlin, New York, 1991.
  Roeser, S., Bastian, U., 1993, The final PPM Star Catalogue for
    both hemispheres, Bull. Inform. CDS, 42, 11.
  SAO, Staff of, 1966, Star Catalogue. Positions and proper
    motions of 258997 stars for epoch and equinox of 1950.0.
    Publ. Smithsonian Inst. of Washington, D.C., No. 4562.
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(End)        Michel Creze [CDS] and Gail L. Schneider [NSSDC/ADC]  11-Nov-1994