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3531N 84 - 23 4 16
WIDC-A-R&SNational Space Science Data Center/
World Data Center A For Rocketj and Satellite*83-19
Documentation for the Machine-Readable Version
of the
CATALOGUE OF 20457 STAR POSITIONS OBTAINED BY PHOTOGRAPHY IN THE
DECLINATION ZONE -48° TO -54° (1950)
(EICHHORN, GOOGE, LIIKAC AND MURPHY 1983)
December 1983
https://ntrs.nasa.gov/search.jsp?R=19840015348 2020-01-12T09:13:34+00:00Z
NSSDC/WDC-A-R&S 83-19
DOCUMENTATION FOR THE MACHINE-READABLE VERSION
OF THE
CATALOGUE OF 20457 STAR POSITIONS OBTAINED By PHOTOGRAPHY .I/V THE
DECLINATION ZONE -48° TO -54° (1950)
(EICHHORN, GOOGE, LtlKAC AND MURPHY 1983)
Wayne H. Warren Jr.
December 1983
National Space Science Data Center (NSSDC)/World Data Center A for Rockets and Satellites (WDC-A-R&S)
National Aeronautics and Space Administration
Goddard Space Flight CenterGreenbelt, Maryland 20771
DOCUMENTATION FOR THE MACHINE-READABLE VERSIONi
OF THE
CATALOGUE OF 20457 STAR POSITIONS OBTAINED BY PHOTOGRAPHY I,V THE
DECLINATION ZONE -43° TO -54° (1950)
(EICHHORN, GOOGE, LUKAC AND MURPHY 1983)
ABSTRACT
A detailed description of the machine-readable catalog, as it is currently be-ing distributed from the Astronomical Data Center, is given. Some minor re-formatting of the magnetic tape version received from the first author wasdone in order to decrease the record size and conserve space; the data contentis identical to the sample shown in Table VI of the source reference (^ichhornet al. 1983, Astron. J. 88, 546).
iii
TABLE OF CONTENTS
Section 1 - INTRODUCTION AND SOURCE REFERENCE 1-1Section 2 - TAPE CONTENTS 2-1Section 3 - TAPE CHARACTERISTICS 3-1Section 4 - REMARKS, MODIFICATIONS, ACKNOWLEGMENT AND REFERENCES .... 4-1Section 5 - SAMPLE LISTING 5-1
LIST-OF TABLES
Table
1 Tape Contents . 2-12 Tape Characteristics ......; 3-1
SECTION 1 - INTRODUCTION AND SOURCE REFERENCE
The Catalogue of 20457 Star Positions Obtained by Photography in the DeclinationZone -48° to -54° (1950) (Eichhorn et al. 1983), hereinafter referred to as the"Sydney Photographic Catalogue -48° to -54°" or "SPC", gives position estimatesdetermined by the plate overlap method (cf. Eichhorn 1960) from plates taken atthe Sydney Observatory in 1964. The catalog was originally planned to fill partof the gap left by the Yale Zone and Cape Photogaphic Catalogues, although thegap has in the meantime been closed by catalogs prepared at Sydney Observatory(see Nicholson 1979; King and Lomb 19£3).
This document describes the machine-readable version of the catalog as it iscurrently being distributed from the Astronomical Data Center. It is intendedto enable users to read and process the data without problems or guesswork.Additional details concerning the plate material and measurement, referencepositions, reductions, elimination of magnitude-dependent aberrations, determi-nation of final positions, and comparison with the FK4 system can be found inthe source reference. A copy of this document should be distributed with anysecondary copy of the machine-readable catalog originating from the AstronomicalData Center.
SOURCE REFERENCE
Eichhorn, H., Googe, w. D., Lukac, C. F. and Murphy, J. K. 1983, Astron. J. 88,546.
1-1
SECTION 2 - TAPE CONTENTS
A byte-by-byte description of the contents of the SPC is given in Table 1. Thesuggested format specifications apply to FORTRAN formatted read statements andcan be modified depending upon individual programming and processing require-ments. Default (null) values are always blanks for data fields read with acharacter (A) format. If no default value is given for a numerical field, thatfield has been found to always contain valid data. Alternate format specifi-cations are given in parentheses.
Table 1. Tape Contents. Sydney Photographic Catalogue -48° to -54°.
Suggested DefaultByte(s) Units Format Value Description
1- 9 A9 (9A1 ) . Number in the Cape Photographic Durchmus-terung (Gill and Kapteyn 1897, 1900). Thezone sign (always -) is in byte 1, the zonein bytes 2-3, byte 4 is blank, and the num-ber is in bytes 5-9. The identificationsare not complete, i.e. existing CPO numbersare not always present.
10 1X Blank
11-13 A3 Source catalog identification, as follows:
A Gill and Houqh (1923)B Jackson and Stoy (1955)
1-120 Plates in Cape AC zone -49°121-240 Plates in Cape AC zone -51°
(Cape 1913-1926)241-360 Plates in Sydney AC zone -53°
(Sydney Obs. 1923-1933; see Wood1971)
where each AC zone is covered by 120 platesand 120 or 240 is subtracted to obtainplate numbers in the -51° and -53°.zones,respectively.
14 1X Blank
15-19 15 Star or plate number in the source catalogindicated in bytes 11-13.
20 A1 An asterisk (*) if the star served as areference star.
21 1X Blank
2-1
Table 1. (Continued)
Byte(s)
22-23
24
25-26
27
28-32
33
34
35-36
37
38-39
40
41-44
45
46-49
SuggestedUnits Format
hours I 2
1X
min 12
1X
sec F5.2
1X
A1
0 12
IX
12
1 X
F4.1
1X
mag F4.1
DefaultValue Description
— Right ascension (a) for the mean coordinatesystem 1950, ostensibly on the system of theFK4, at the average epoch 1964.475 of allplates which provided data. (If hicjheraccuracy epochs are required, Table I ofEichhorn et al. 1983 should he consulted. )
Blank _
a
Blank
a
Blank
Sign of declination (6) for the mean coor-dinate system 1950 (see description forbytes 22-23) .
6
Blank
6
Blank
6
Blank
blank Photovisual magnitude, taken from existing
50
51
1X
11
sources. (For AC stars, the magnitudeswere computed from data given in the AC andare photographic.) Magnitudes are neitherprecise nor accurate and are given forreference purposes only.
Blank
Number of measured central images contrib-uting to the calculation of the publishedposition.
2-2
Table 1. (Concluded)
Suggested DefaultByte(s) Units Format Value Description
52 1X Blank
53 —- 11 blank Number of pairs of diffraction spectra con-tributing to the calculation of the publishedposition. The number of individual imagesmeasured for computing a published positionis the number in byte 51 plus twice the num-ber in byte 53 (see Kichhorn_et aZ. 1983).
2-3
SECTION 3 - TAPE CHARACTERISTICS
The information contained in Table 2 is sufficient for a user to describe theindigenous characteristics of the machine-readable Sydney Photographic Catalogue toa computer. Information easily varied from installation to installation, such asblock size (physical record length), blocking factor (number of logical records perphysical record), total number of blocks, tape density, and internal coding(EBCDIC, ASCII, etc.) is not included. This information should always be suppliedif secondary copies are transmitted to other users or installations.
Table 2. Tape Characteristics. Sydney Photographic Catalogue -48° to -54°.
NUMBER OF FILES 1
LOGICAL RECORD LENGTH (BYTES) S3
RECORD FORMAT PR
TOTAL NUMBER OF LOGICAL RECORDS ; 20457
Fixed block length (last block may be short)
3-1
SECTION 4 - REMARKS, MODIFICATIONS, ACKNOWLEDGMENT AND REFERENCES
The machine-readable version of the SPC was received on magnetic tape fromH. Eichhorn in February 1982. As received, the file consisted of 104-byterecords with bytes 1-25 blank and many other blanks throughout the records.The records on this tape had been designed specifically for printing thecatalog and microfiching rather than for efficient storage and computing. Toincrease storage efficiency the following modifications were made after checkingwith the first author to be certain that the changes would he acceptable.
1. Superfluous blanks were removed from throughout the data records,except for a single separator blank between each of the data fields; thusthe logical record length was decreased from 104 to 53 bytes.
2. Preceding zeros were added to all right ascension and declinationfields.
ACKNOWLEDGMENT
Appreciation is expressed to Dr. H. Eichhorn for providing the SPC on tape andfor reviewing and commenting on a draft copy of this document.
REFERENCES
Cape of Good Hope 1913-1926, Cape Astrographic Zones, Catalogue of RectangularCoordinates and Diameters of Star Images, Zones -41° to -51° (Royal Observa-tory, Cape of Good Hope), Vols. 2 (-49°) and 11 (-51°).
Eichhorn, H. 1960, Astron. fJachr. 285, 233.
Eichhorn, H., Googe, W. D., Lukac, C. F. and Murphy, J. K. 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 -33°to -52°, Ann. Cape Observatory ±, Part II.
Gill, D. and Kapteyn, J. C. 1900, Cape Photographic Ourchmusterung, Zones -53°to -59°, Ann. Cape Observatory ^, Part III.
Jackson, J. and Stoy, R. H. 1955, Cape Photographic Catalogue for 1950.0. Zone-52° to -56° (London: H. M. Stationery Office).
King, D. S. and Lomb, N. R. 1983, Sydney Southern Star Catalogue, preprint.
Nicholson, W. 1979, in IAU Colloquium 43, Modern Astrometry, edited by F. V.Prochazka and R. H. Tucker (Vienna: University Observatory), p. 515.
4-1
Sydney Observatory 1923-1933, Astrographic Catalogue 1900.0, Sydney Section,Dec. -51° to -65°, Vols. I-XII, DEC -51° to -55°, Plate Centres DEC. -52°,-54° (Sydney: Alfred James Kent, Government Printer).
Wood, H. 1971, Astrographic Catalogue 1900.0, Sydney Section.- Dec. -51° to -65°Vol. LIII Explanation (Sydney: Sydney Observatory).
4-2
SECTION 5 - SAMPLE LISTING
The sample listing given on the following pages contains logical data recordsexactly as they are recorded on the tape. Groups of records from the beginningand end of each file of the catalog are illustrated. The beginning of eachrecord and bytes within the record are indicated by the column heading indexacross the top of each page (digits read vertically).
5-1
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IWY5ANational Aeronautics andSpace Administration
Goddard Space Flight CenterGreenbelt, Maryland 20771