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jNIKOLOFF AND HOG 1982)

(NASA-1r:-87!76) LULUCLhTA11Ch i'UR THE N65-1.:451M^.UrIINE-AE1 y e.LL1; VhhS1LN CE 'LEE PEbld 75: ALAihL0GJF ul ECE.TIChS GY 4:jb9 fK4 AND kK45STa1tS (NIKULUir AhL bLG 15Et) (NASA) 14 F U tic :ul^

/ r

SL AJ211.1r t ► U1 .SLL 09b GJ/t 1 1481t,

A/DC-A-R& INational Space Science Date Center/

World Date Center A For Rockets and Satellites H4-0

NSSOC/WDC-A-RBS 84-03

DOCUMENTATION FOR THE MACHINE-READABLE VERSION

OF THE

PERTH 75: A CATALOGUE OF POSITIONS OF 2589 FK4 AND FK4S STARS

(NIKOLOFF AND HOG 1982)

Wayne H. 'Marren Jr.

February 1984

a

IN

National Space Science Data Center (NSSDC)IWorld Data Center A for Rockets and Satellites (WDC-A-R&S)

National Aeronautics and Space AdministrationGoddard Space Flight CenterGreenbelt, Maryland 20771

DOCUMENTATION FOR THE MACHINE-READABLE VERSION

OF THE

PERTH 75: A CATALOGUE OF POSITIONS OF 2589 FK4 AND FK4S STARS

(NIKOLOFF AND HAG 1482)

ABSTRACT

Detailed descriptions of the data and format of the machine-readable catalogare given. The machine version is identical in data content to the publishededition, but minor modifications in the data format have been made in order toeffect uniformity with machine versions of other astrometric catalogs.

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, ACKNOWLEDGMENTS AND REFERENCES .. 4-1Section 5 - SAMPLE LISTING ......................... :................ 5-1

LIST OF TABLES

Table

1 Tape Contents .................................................. 2-12 Tape Characteristics ........................................... 3-1

v

SECTION 1 - INTRODUCTION AND SOURCE REFERENCE

The PERTH 75 (Nikoloff and Hog 1982) contains results of approximately 60000photoelectric meridian circ)e observations made at the Perth Observatory for

1156 FK4 (Fricke and Kopff 1963) and 1433 FK4 Supplement (Astronomisches

Rechen-Institut 1963) stars south of declination +38°. The catalog reports

proper motions and positions at epoch and equinox 1950.0 and was prepared

according to recommendations set forth by W. Fricke for data to be incorporated

into the new fundamental catalog FK5. The data used to derive the epoch 1950.0

positions are included in the catalog so that originally observed positions may

be recomputed and used for geodetic purposes until the FK5 becomes available.

The accidental mean error of an individual position at epoch 1975 is 0:07 in

right ascension (RA) and 0.'13 in declination (DE'C) at a zenith distance of 45 0 ,

while the mean error of the PERTH 75 system is ( 1 705 in RA and 0.'10 in DEC. The

mean errors of annual proper motions for FK4 sta, ,s are — 0:002 and < 0:010

for FK4S stars. The positions do not contain the large systematic errors ofFK4, which can be, e.g., 0.3 in RA for b < -75°. Of course, the reference

system is not strictly FK4, but rather PERTH 75, an improved FK4 system.

This document describes the machine-readable version of the PERTH 75 catalog.

It is intended to enable users to process the data without problems and

guesswork. For additional information concerning positional and proper-motion

errors, the observations and reductions, systematic corrections, accidental

errors and comparison with the FK4 and PERTH 70 (Hog and von der Heide 1976)

catalogs, users should consult the source reference. A copy of this document

should be transmitted with any machine version of the catalog originally

obtained from the Astronomical Data Center.

SOURCE REFERENCE

Nikoloff, I. and Hog, E. (in collaboration with C. Ayers, Mrs. I. Nikoloff, Mrs.

C. Spencer, Mrs. M. Sultana, A. Verveer and P. J. Hoyer) 1982, Perth 75, ACatalogue of Positions of 2589 FK4 and FK4S Stars Mickley, W Australia:Perth Observatory).

1-1

SECTION 2 - TAPE CONTENTS

A byte-by-byte description of the contents of the machine-readable PERTH 75 isgiven in Table 1. The suggested format specifications are for FORTRAN foniattedread statements and can be modified depending upon individual programmming andprocessing requirements. Default (null) values for data read with A formatspecifications are always blanks, while all data are present for numericalfields.

Table 1. Tape Contents. PERTH 75 Catalogue.

now

Suggested

Byte(s) Units Format Description

1- 4 --- I4 Star number in FK4 (< 2000) or FK4S (> 2000).

5- 7 --- 3X Blank

8-11 mag F4.2 Observed visual magnitude, mv, unless thereis an "s" in byte 12.

12 ---- Al An "s" (lower case) if my has been taken

E from the FK4.

13 --- 1X

Blank

14-16 --- I3 Code for spectral type used in computingrefraction. Minus signs are always in byte14. The corresponding HD spectral types, asgiven in Table 7 of Nikoloff and Hpg 1982,are as follows: 8 = B0, 7 = B5 9 6 = A0,

5 = A5, 3 = F0, 2 = F2, 1 = F5, -1 = F8,-2 = GO, -7 - G5, -12 = K0, -14 = K2,-17 = K5, -24 = M0, -25 = N, -26 = M5.

17-19 --- 3X

B1 ank

20-21 hours I2 Right ascension, a, at epoch 1950.0, referredto equator and equinox 1950.0. Thedetermination of the equator and zero pointin RA was made from observations of approxi-mately 40 FK4 stars per night.

22 --- 1X Blank

23-24 min I2 a

2-1

Table 1. (concluded)

tom. r-^r- ^raas=a=.xr

SuggestedByte(s) Units Format Description

83-84 --- I2 Number of accepted observations in a.

85-86 --- 2X Blank

87-88 --- I2 Number of accepted observations in ^.

89-91 --- 3X Blank

92-96 years F5.2 Epoch - 1900 for the observation in ^.

97 --- 1X Blank

98 --- Al A letter "p" (lower case) if parallax and*orradial velocity used in computin g apparentpositions.

2-3

SECTION 3 - TAPE CHARACTERISTICS

The information contained in Table 2 is sufficient for a user to describe theindigenous characteristics of the magnetic tape version of the PERTH 75 to acomputer. Information which is easily varied from installation to instillation,such as block size (physical record length), blocking factor (num er of logicalrecords per physical record), total number of blocks, tape density, and coding(EBCDIC, ASCII, etc.) is not included: this information should always he suppliedif secondary tape copies of the catalog are transmitted to other users orinstallations.

Table 2. Tape Characteristics. PERTH 75 Catalogue.

NUMBER OF FILES ........................................................ 1

LOGICAL RECORD LENGTH (BYTES) .......................................... qR

RECORD FORMAT .......................................................... FR*

TOTAL NUMBER OF LOGICAL RECORDS ........................................ 25RQ

* Fixed block length (last block may be short)

3-1

SECTION 4 - REMARKS, MODIFICATIONS, ACKNOWLEDGMENTS AND REFERENCES

The machine version of the PERTH 75 catalog was received from Dr. I. Nikoloff on13 December 1983 in the form of two IBM 3740 formatted diskettes. The diskettes

were read on a POP 11-44 minicomputer and the data written to magnetic tapeusing a utility program. They were then transferred to disk storage on an IBM3081 computer for editing and subsequent reblocking to an archive tape. Certain

minor modifications were made to the format to effect uniformity in datastructure with other computerized astrometric catalogs and one correction to a

data record was made. The changes made were as follows:

1. The coded spectral types had been written as integers; thus, the minus signswere not always in the same column. These were moved to occur always in

byte 14.

2. The right ascensions i^ hours for zero hours were blank; they were changed

to 00 and preceding :zeros were added to all single-digit hours and minutes

fields.

3. Declination fields were non-uniform, e.g. minus signs occurred in various

colimns depending upon the degrees value and were in the arcminutes fieldsfor the zero declination zone. The minus siqns were moved co occur always

in byte 35, preceding zeros were added to single-digit ° and ' fields (the

" fields already had them), and plus signs were added to all positive zones.

4. The oacos b and Ab fields were homogenized so that the signs and numbers

occur uniformly.

5. Column headings were removed from the beginning of the file so that only

uniform data are now present.

6. One data record (star 2764 at 9 11 32m ) was found to have shifted (non-

aligned) oacos 5, e6 and Epoch values--these data were alianed.

ACKNOWLEDGMENTS

Appreciation is expressed to 1. Nikoloff for supplying the machine version of

the PERTH 75 catalog. Drs. Nikoloff and Hog kindly reviewed a preliminary

version of this document before the final was produced for distribution with themagnetic tape.

Astronomisches Rechen-lnstitut 1963, Sup:^Zement to the =k4Verof,F . Astron. Rechen-Inst. yeidel b. , Vr. 11.

Fricke, W. and Kopff, A. (in collaboration with W. Gliese, P . Gondolatsch,T. Lederle, H. Nowacki, W. Strobel and P. Stumpff) 1963, Fourth ?un^z-^sn, ;>Catalogue (YX4), Vero , ,F . Astron. ?echen-rest. qe-_"Ielb., Vr. 19.

4-1

RFERENCES (continued)

Hog, E. &nd von der Heide, J. 1976, Perth 70: A Catalogue of Positio ►is 9.0

24900 Stars, Abh. der ,Yambur3er Sternwarte, Band IX.

Nikoloff, I. and Hog, E. (in collaboration with C. Ayers, Mrs. I. Nikoloff,Mrs. C. Spencer, Mrs. M. Sultana, A. Verveer and P. J. Hoyer) 1982, Perth 75,

A Catalogue of Positions of 2569 FK4 and eK4S Stars (Bickley, W. Australia:Perth Observator)).

r

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 beginning

and end of the catalog are illustrated. The beginning of each record and

bytes within the record are indicated by the column head i ng Index across the

top of each page (digits read vertically).

5-1

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5-3