I/6 Cape Catalog of 20554 Faint Stars, -40 to -52° (Spencer Jones+ 1939)
Catalogue of 20554 Faint Stars in the Cape Astrographic Zone -40 to -52 Degrees for the Equinox of 1900.0 Spencer J.H., Jackson J. <His Majesty's Stationery Office, London (1939)> =1939HMSO..C......0S
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
Byte-by-byte Description of file: faint.dat
Bytes Format Units Label Explanations
1- 5 I5 --- ID Cape Number 6 A1 --- rem *[AFN] Remark 7- 9 I3 --- CPDz *? 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
Note on rem: A = Astrographic Star F = Faint Proper Motion Star N = Other Note Note on CPDz: 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 CPDz. 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.
History: * Originally keypunched around 1970 (see Lederle 1971BICDS...1...25L) * 1995-Sep: reformatted at ADC (addition of decimal points) * 10-Jan-2011: a few spectral types fixed (detected by B. Skiff) for CF stars 1777, 2060, 7794, 16678, 17279, 17577 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).
(End) Julie Anne Watko [SSDOO/ADC] 26-Mar-1996
|The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line|