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I/6     Cape Catalog of 20554 Faint Stars, -40 to -52{deg}         (Jones+ 1939)
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Catalogue of 20554 Faint Stars in the Cape Astrographic Zone -40 to -52 Degrees
    for the Equinox of 1900.0
    Jones H.S., Jackson J.
   <His Majesty's Stationery Office, London (1939)>
   =1939cfsc.book.....J
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ADC_Keywords: Positional data ; Proper motions

Description:
    This catalog  contains positions,  precessions,   proper motions,  and
    photographic  magnitudes for  20,554 stars.   These were  derived from
    photographs taken at the Royal Observatory,  Cape of Good Hope between
    1923 and 1928.   It covers the  astrographic zones -40  degrees to -52
    degrees of declination.   The  positions  are  given  for  epoch  1900
    (1900.0). It includes spectral types for many of the stars listed.  It
    extends  the earlier catalogs derived from  the same plates to fainter
    magnitudes.   The computer-readable version consists  of a single data
    table.

    The stated  probable error for the star  positions is 0.024 seconds of
    time (R.A.)  and 0.25 seconds  of  arc  (Dec.)   for  stars  with  one
    determination, 0.017 seconds of time,  and 0.18 seconds of arc for two
    determinations, and 0.014 / 0.15 for stars with three determinations.

    The precession and secular  variations  were  derived  from  Newcomb's
    constants.

    The authors quote probable  errors  of  the  proper  motions  in  both
    coordinates  of 0.008 seconds of arc for stars with one determination,
    0.0055 seconds for stars with two determinations, and 0.0044 for stars
    with three.

    The  photographic magnitudes were derived  from the measured diameters
    on the  photographic plates and from the  magnitudes given in the Cape
    Photographic Durchmusterung.

    The  spectral classification of the catalogued stars was done with the
    assistance of Annie Jump Cannon of the Harvard College Observatory.

    The user  should consult the source reference  for more details of the
    measurements  and reductions.  See also the notes in this document for
    additional information on the interpretation of the entries.

File Summary:
--------------------------------------------------------------------------------
 FileName   Lrecl  Records   Explanations
--------------------------------------------------------------------------------
ReadMe         80        .   This file
faint.dat      64    20554   The Catalogue
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Byte-by-byte Description of file: faint.dat
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   Bytes Format  Units    Label    Explanations
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   1- 5  I5     ---      ID       Cape Number
      6  A1     ---      rem     *[AFN] Remark
   7- 9  I3     ---      CPDZone *? Cape Phot. Durchmusterung (CPD) Zone
  10-14  I5     ---      CPDNo   *? CPD Number or Astrographic Plate
     15  I1     ---    m_CPDNo   *[1,4]? Multiplicity Remarks
  17-20  F4.1   mag      mpg     *?=99.9 Photographic Magnitude
  21-22  I2     h        RAh      Mean Right Ascension hours 1900
  23-24  I2     min      RAm      Mean Right Ascension minutes 1900
  25-29  F5.2   s        RAs      Mean Right Ascension seconds 1900
     30  A1     ---      DE-      [-] Declination Sign
  31-32  I2     deg      DEd      Mean Declination degrees 1900
  33-34  I2     arcmin   DEm      Mean Declination arcminutes 1900
  35-38  F4.1   arcsec   DEs      Mean Declination arcseconds 1900
  39     I1     ---      N        Number of Observations
  40-44  F5.2   yr       Ep-1900  Epoch +1900
  45-50  F6.4   s/a      pmRA     ? Proper Motion in RA seconds of time
  51-56  F6.3   arcsec/a pmRAas   ? Proper Motion in RA arcseconds
  57-62  F6.3   arcsec/a pmDE     ? Proper Motion in Dec arcseconds
  63-64  A2     ---      Sp       HD Spectral Type
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Note on rem:
        A = Astrographic Star
        F = Faint Proper Motion Star
        N = Other Note

Note on CPDZone:
        All CPD Zones are negative (- sign in byte 7).
        A value of "0" signifies Astrographic Plate instead of CPD.

Note on CPDNo:
        See also note on CPDZone.
        Astrographic plate listed "is the more southerly on which the
        star occurs." Thus, y-coordinate is positive wherever possible.

Note on m_CPDNo:
        A number from 1-4 appears in this byte for double stars where
        the same CPD number applies to more than one star.

Note on mpg:
        The Photographic Magnitude is "determined from the CPD Magnitude
        and the diameter on the Cape Astrographic Plates by means of the
        data given in the volume on the Magnitudes of Stars in the Cape
        Zone Catalogue."
        A null value (99.9) signifies a variable star.
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References:
  Spencer Jones H. and Jackson J. (1939) Catalogue of 20,554 faint stars in the
        Cape Astrographic Zone -40deg to -52deg for the equinox of 1900.0
        giving positions, precessions, proper motions and photographic
        magnitudes (London: HMSO).
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(End)                                  Julie Anne Watko [SSDOO/ADC]  26-Mar-1996