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I/73B Sydney Photographic Cat 20457 Stars, -48 to -54 (Eichhorn+ 1983)
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Catalogue of 20457 Star Positions Obtained by Photography in the Declination
Zone -48 to -54 Degrees (1950)
Eichhorn H., Googe W.D., Lukac C.F., Murphy J.K.
<AJ, 88, 546 (1983)>
=1983AJ.....88..546E
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ADC_Keywords: Positional data ; Photographic catalog
Description:
This catalog is also known as the Sydney Photographic Catalogue -48 to -54
Degrees or SPC and gives positions determined by the plate
overlap method from plates taken at the Sydney Observatory in 1964. The
catalog was originally planned to fill part of the gap left by the Yale
Zone and Cape Photographic Catalogues, although the gap has in the meantime
been closed by catalogs prepared at Sydney Observatory (Nicholson 1979,
King and Lomb 1983). Data in the catalog include star number (CPD;
identifications not complete), source catalog identification (AC zones) and
related information, right ascension/declination on the FK4 system (equinox
and equator B1950, average epoch 1964.475), photovisual magnitude, and
numbers of images and pairs of diffraction spectra used in computing
position.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
adc.doc 80 564 ADC Documentation
catalog.dat 53 20457 Catalog Data
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Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- CPDnum *Number in Cape Photographic Durchmusterung
11- 13 A3 --- Source *Source catalog identification
15- 19 I5 --- number Star or plate number in the source catalog
20 A1 --- refstar [* ] Asterisk (*) means the star served as a
reference star.
22- 23 I2 h RAh *Right ascension hours (1950)
25- 26 I2 min RAm Right ascension minutes (1950)
28- 32 F5.2 s RAs [0.00-60.00]Right ascension seconds (1950)
34 A1 --- DE- *Sign of declination (1950)
35- 36 I2 deg DEd Declination degrees (1950)
38- 39 I2 arcmin DEm Declination minutes (1950)
41- 44 F4.1 arcsec DEs [0.0-60.0]Declination seconds (1950)
46- 49 F4.1 mag Ptm *? Photovisual magnitude, taken from existing
sources.
51 I1 --- o_image Number of measured central images used to
calculate the published position.
53 I1 --- o_spect *? Number of pairs of diffraction spectra used
to calculate the published position.
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Note on CPDnum:
From Gill and Kapteyn (1897, 1900). The zone sign (always -) is in byte 1,
the zone in bytes 2-3, byte 4 is blank, and the number is in bytes 5-9.
The identifications are not complete, i.e., existing CPD numbers are not
always present.
Note on Source:
A Gill and Hough (1923)
B Jackson and Stoy (1955)
1-120 Plates in Cape AC zone -49 deg
121-240 Plates in Cape AC zone -51 deg (Cape 1913-1926)
241-360 Plates in Sydney AC zone -53 deg (Sydney Obs. 1923-1933; see Wood
1971)
where each AC zone is covered by 120 plates and 120 or 240 is subtracted
to obtain plate numbers in the -51 deg and -53 deg zones, respectively.
Note on RAh, DE-:
Given for the mean coordinate system 1950, ostensibly on the system
of the FK4, at the average epoch 1964.475 of all plates which provided
data. (If higher accuracy epochs are required, Table I of Eichhorn et al.
1983 should be consulted.)
Note on Ptm:
For AC stars, the magnitudes were computed from data given in the AC and
are photographic. Magnitudes are neither precise nor accurate and are
given for reference purposes only.
Note on o_spect:
The number of individual images measured for computing a published
position is the number in byte 51 plus twice the number in byte 53
(see Eichhorn et al. 1983).
Remarks:
The machine-readable version of the SPC was received on magnetic tape from
records with bytes 1-25 blank and many other blanks throughout the records.
The records on this tape had been designed specifically for printing the
catalog and microfiching rather than for efficient storage and computing.
To increase storage efficiency the following modifications were made after
checking with the first author to be certain that the changes would be
acceptable.
1. Superfluous blanks were removed from throughout the data records,
except for a single separator blank between each of the data fields
decreasing the logical record length from 104 to 53 bytes.
2. Leading zeros were added to all right ascension and declination fields.
Acknowledgments:
Appreciation is expressed to Dr. H. Eichhorn for providing the SPC
on tape and for reviewing and commenting on the original ADC document.
References:
Cape of Good Hope 1913-1926, Cape Astrographic Zones, Catalogue of
Rectangular Coordinates and Diameters of Star Images, Zones -41 deg to
-51 deg (Royal Observatory, Cape of Good Hope), Vols. 9 (-49 deg)
and 11 (-51 deg).
Eichhorn, H. 1960, Astron. Nachr. 285, 233.
Eichhorn, H., et al. 1983, Astron. J. 88, 546
Gill, D. and Hough, S.S. 1923, Zone Catalogue of 20,843 Stars,
Equinox 1900 Royal Obs., Cape of Good Hope (London: H. M. Stationery
Office).
Gill, D. and Kapteyn, J.C. 1897, Cape Photographic Durchmusterung, Zones
-38 deg to -52 deg, Ann. Cape Observatory 4, Part II.
Gill, D. and Kapteyn, J.C. 1900, Cape Photographic Durchmusterung, Zones
-53 deg to -59 deg, Ann. Cape Observatory 5, Part III.
King, D.S., and Lomb, N.R. 1983, "Sydney Southern Star Catalogue", J. Proc.
R. Soc. N.S.W., 116, 53 (Sydney Obs. Paper No. 96) (catalog 1086A)
Nicholson, W. 1979, in IAU Colloquium 48, "Modern Astrometry", ed. by
F.V. Prochazka and R.H. Tucker (Vienna, University Observatory), p. 515
Jackson, J. and Stoy, R. H. 1955, Cape Photographic Catalogue for 1950.0.
Zone -52 deg to -56 deg (London: H. M. Stationery Office).
Sydney Observatory 1923-1933, Astrographic Catalogue 1900.0, Sydney Section,
Dec. -51 deg to -65 deg, Vols. I-XII, DEC -51 deg to -55 deg,
Plate Centres Dec. -52 deg, -54 deg (Sydney: Alfred James Kent,
Government Printer).
Wood, H. 1971, Astrographic Catalogue 1900.0, Sydney Section: Dec. -51 deg
to -65 deg Vol. LIII Explanation (Sydney: Sydney Observatory).
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(End) James E. Gass [SSDOO/ADC] 31-Jul-1997