File Summary:
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 FileName           Lrecl  Records   Explanations
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ReadMe                 80        .   This file
ident_o.dat           103      465   Preferred identifications
ident_a.dat           103      447   Identifications from VizieR J_A+A_530_A93
dists_o.dat            44      465   Differences with modern positions
keppto_oo.dat          35      299   Cross-mapping of 2a with Ptolemy's catalog
keptyc_oo.dat          45       48   Cross-mapping of 2a with Tycho's catalog
kephou_oo.dat          34      136   Cross-mapping of 3a with Houtman's catalog
kephal_oo.dat          34      136   Cross-mapping of 3a with Halley's catalog
keplac_o.dat           40      445   Cross-mapping with Lacaille's catalog
kepref_o.dat           30      461   Cross-mapping with the reference catalog
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Byte-by-byte Description of file: ident_o.dat ident_a.dat
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   Bytes Format Units   Label   Explanations
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  11- 14  I4    ---     KNo     ?Record number in Tabulae Rudolphinae (1)
  16- 18  A3    ---     TCon    ?Constellation abbreviation (1)
  20- 21  I2    ---     TNum    ?Number in constellation (1)
      22  A1    ---     NoId    [*+?]? Identification issue (2)
  23- 25  A3    ---     BCon    ?Bayer constellation
  27- 29  A3    ---     BLet    ?Bayer letter
      31  A1    ---     BInd    ?Bayer index
  33- 35  A3    ---     FCon    ?Flamsteed constellation
  37- 39  I3    ---     FNum    [1-141]? Flamsteed number
  41- 44  I4    ---     HR      [1-9110]? Bright Star catalog number
  46- 51  I6    ---     HD      [1-359083]? Henry Draper catalog number
      52  A1    ---     HD_FL   [*]? Next HD number applies
  53- 58  I6    ---     HIP     [1-120416]? Hipparcos catalog number
  60- 65  I6    ---     SAO     [1-258997]? SAO catalog number
      66  A1    ---     SAO_FL  [*]? Next SAO number applies
  67- 70  A4    ---     Com     ?Component letter(s) (3)
  72- 76  F5.2  ---     Mag     ?Magnitude (4)
      77  A1    ---     Shr     [*]? Shared magnitude
  78-104  A27   ---     Name    ?Object name(s)
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Note (1): these fields are empty on lines containing additional matches for the
    current star.

Note (2): a '*' here indicates that this catalog entry has no identification; a
     '?' indicates a possible but less secure identification; a '+' indicates
     that the identification is not given directly in the source catalog but
     has been inferred from catalog notes or non-standard designations, or
     corrected from an obvious error in the catalog.

Note (3): component letter(s) from the Hipparcos catalog (or sometimes the SAO
     or Bright Star catalog).

Note (4): magnitude from the Hipparcos catalog or the SAO catalog.

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Byte-by-byte Description of file: dists_o.dat
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   Bytes Format Units   Label   Explanations
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  11- 14  I4    ---     KNo     ?Record number in Tabulae Rudolphinae
  16- 18  A3    ---     TCon    Constellation abbreviation
  20- 21  I2    ---     TNum    ?Number in constellation
  23- 29  F7.2  arcmin  dLO     ?Difference in longitude.cos(LA) (1)
  31- 37  F7.2  arcmin  dLA     ?Difference in latitude (1)
  39- 44  F6.2  arcmin  dist    ?Distance between match and Tycho (1)
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Note (1): difference (HIP - Kepler), or (SAO - Kepler) if there is no HIP
    match, based on the positions in kepler_2.dat or kepler_3.dat and
    identifications in ident_o.dat

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Byte-by-byte Description of file: keppto_oo.dat
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   Bytes Format Units   Label   Explanations
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  11- 14  I4    ---     KNo     ?Record number in Tabulae Rudolphinae (G1)
  16- 18  A3    ---     TCon    ?Constellation abbreviation (G1)
  20- 21  I2    ---     TNum    ?Number in constellation (G1)
      23  A1    ---     Status  [=x*] status (G2)
  25- 28  I4    ---     PNo     [1/1028]? Unique Ptolemy star number
  30- 32  A3    ---     PCon    ?Ptolemy constellation
      33  A1    ---     PInf    [~]? ~ if 'informis'
  34- 35  I2    ---     PNum    ?Ptolemy number in constellation
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Byte-by-byte Description of file: keptyc_oo.dat
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   Bytes Format Units   Label   Explanations
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  11- 14  I4    ---     KNo     ?Record number in Tabulae Rudolphinae (G1)
  16- 18  A3    ---     TCon    ?Constellation abbreviation (G1)
  20- 21  I2    ---     TNum    ?Number in constellation (G1)
      23  A1    ---     Status  [=x*] status (G2)
  25- 28  I4    ---     MNo     ?Record number in the manuscript catalog
  30- 33  I4    ---     TNo     ?Record number in Progymnasmata catalog
  35- 38  I4    ---     KNo_    ?Record number in Tabulae Rudolphinae
  40- 42  A3    ---     TCon_   ?Constellation abbreviation
  44- 45  I2    ---     TNum_   ?Number in constellation
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Byte-by-byte Description of file: kephou_oo.dat
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   Bytes Format Units   Label   Explanations
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  11- 14  I4    ---     KNo     ?Record number in Tabulae Rudolphinae (G1)
  16- 18  A3    ---     TCon    ?Constellation abbreviation (G1)
  20- 21  I2    ---     TNum    ?Number in constellation (G1)
      23  A1    ---     Status  [=x*] status (G2)
  25- 27  I3    ---     DNo     [1/305]? Unique Houtman star number
  29- 31  A3    ---     DCon    ?Houtman constellation
  33- 34  I2    ---     DNum    ?Houtman number in constellation
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Byte-by-byte Description of file: kephal_oo.dat
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   Bytes Format Units   Label   Explanations
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  11- 14  I4    ---     KNo     ?Record number in Tabulae Rudolphinae (G1)
  16- 18  A3    ---     TCon    ?Constellation abbreviation (G1)
  20- 21  I2    ---     TNum    ?Number in constellation (G1)
      23  A1    ---     Status  [=x*] status (G2)
  25- 27  I3    ---     YNo     [1/341]? Unique Halley star number
  29- 31  A3    ---     YCon    ?Halley constellation
  33- 34  I2    ---     YNum    ?Halley number in constellation
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Byte-by-byte Description of file: keplac_o.dat
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   Bytes Format Units   Label   Explanations
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  11- 14  I4    ---     KNo     ?Record number in Tabulae Rudolphinae (G1)
  16- 18  A3    ---     TCon    ?Constellation abbreviation (G1)
  20- 21  I2    ---     TNum    ?Number in constellation (G1)
      23  A1    ---     Status  [=>x*] status (G2)
  25- 28  I4    ---     CA      [1-1942]? Catalog number in [CA]
      29  A1    ---   f_EA      [x*]? Issue with observation numbering (2)
  30- 33  I4    ---     EA      [1-1935]? Observation number in [EA]
  35- 40  A6    ---     NA      ?Designation in [EN] (<class>.<number>)
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Byte-by-byte Description of file: kepref_o.dat
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   Bytes Format Units   Label   Explanations
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  11- 14  I4    ---     KNo     ?Record number in Tabulae Rudolphinae (G1)
  16- 18  A3    ---     TCon    ?Constellation abbreviation (G1)
  20- 21  I2    ---     TNum    ?Number in constellation (G1)
      23  A1    ---     Status  [=>x*] status (G2)
  25- 30  I6    ---     RefNo   ?Number in the reference catalog
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Global notes:

Note (G1): the fields KNo TCon TNum are blank on continuation lines for the
    current record.

Note (G2): status of this Kepler object with respect to the other catalog,
    according to the identifications retained in the file ident_o.dat for
    Kepler's catalog and either ident_o.dat or ident.dat for the other catalog:
    = indicates that the Kepler and other catalog entries are identified as
      the same object or collection of objects,
    > indicates that the Kepler catalog entry includes the other catalog's
      entry, and more (for instance if two components of a double star are
      distinguished in the other catalog but lumped into one entry in Kepler's
      catalog),
    x indicates that the Kepler catalog entry has an identification, but no
      match in the other catalog,
    * indicates that the Kepler catalog entry is unidentified.

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History:

  * 2022-04-12: new revised edition

================================================================================
