The machine readable version of the catalog, as it is currently being distributed from the Astronomical Data Center, is described. The Zodiacal Zone Catalog is a catalog of positions and proper motions for stars in the magnitude range where m sub v is between 4 and 10, lying within 16 deg of the ecliptic and north of declination -30 deg. The catalog contains positions and proper motions, at epoch, for equator and equinox J2000.0, magnitudes and spectral types taken mostly from the Smithsonian Astrophysical Observatory Star Catalog, and reference positions and proper motions for equinox and epoch B1950.0

Warren, Wayne H., Jr.

English

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(NA_A-TH-]050_O} T_ US NAVAL O_SERVATORY
ZODTACAL ZONE CAT^LnG (DOUGLAS AND
HARRINGTON 1990): DOCUMENTATION FOR THE
MACqINE-RFAOABLF VERSION (NASA) 15 p
CSCL 03A
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https://ntrs.nasa.gov/search.jsp?R=19910021716 2020-03-19T17:22:56+00:00Z
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NSSDC/WDC-A-R&S 90-15
THE U. S. NAVAL OBSER VA TOR Y
ZODIACAL ZONE CA TALOG
(Douglass and Harrington 1990)
Documentation for the Machine-Readable Version
Wayne H. Warren Jr.
June 1990
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 Center
Greenbelt, Maryland 20771
ii 1157
Abstract
The machine-readable version of the catalog, as it is currently being distributed from the Astronomical
Data Center, is described. The Zodiacal Zone Catalog is a catalog of positions and proper motions for
stars in the magnitude range 4 <--my < 10, lying within 16° of the ecliptic and north of declination
- 30°. The catalog contains positions and proper motions, at epoch, for equator and equinox J2000.0,
magnitudes and spectral types taken mostly from the Smithsonian Astrophysical Observatory Star Cat-
alog, and reference positions and proper motions for equinox and epoch B 1950.0.
_L
f,
L
( -5
PRECEDi_,'G PAGE BLANK NOT FiL&_ED
Abstract iii
1157
Table of Contents
!.0 Introduction ........................................................... !
1.1 Description ............................................................ 1
1.2 Source Reference ....................................................... 1
2.0 Structure ............................................................. 3
2.1 File Summary .......................................................... 3
2.2 Catalog (File 1 of 1) ..................................................... 4
3.0 History ............................................................... 7
3.1 Remarks and Modifications ................................................ 7
4.0 Acknowledgments and References ............................................ 9
4. l Acknowledgments ....................................................... 9
4.2 References ............................................................ 9
Appendix A. Sample Listing .................................................. I 1
PRECEDING PAGE BLANK NOT FILMED
Table of Contents v
1157
Table
Table
List of Tables
31. Summary Description of Catalog Files .................................... 42. Data File Record Format .............................................
PRECEDING PAGE BLANK NOT FILMED
List of Tables vii
_fi I157
1.0 Introduction
1.1 Description
The U. S. Naval Observatory Zodiacal Zone Catalog (ZZCAT) provides positions and proper motions
at equator and equinox J2000.0, on the FK5 system, for stars in the magnitude range 4 <--rn_ < 10
within 16° of the ecliptic and north of _ = - 30°. The catalog is a modem edition of the Zodiacal
Catalog produced by Robertson (1940) that goes to fainter magnitudes and contains J2000.0 positions
and proper motions on the system of the FK5 (Fricke et at. 1988). In order that references to earlier
catalogs can be made, the ZZCAT also provides positions and proper motions at equinox and epoch
B 1950.0. However, the B1950.0 positions are referred to the FK4 (Fricke and Kopff 1963) equinox and
include E terms, while the proper motions are referred to Newcomb's precession. They were computed
from the J2000.0 data using the algorithm given in The Astronomical Almanac for 1990 (p. B43). Other
useful information, such as visual magnitudes and spectral types, is also provided. Stellar identification
is strictly by Durchrnusterung number (no new numbering system is introduced) and the catalog is or-
dered by J2000.0 right ascension.
Positions with a mean epoch of about 1980 and internal accuracies of 0._15 were obtained from plates
taken with the U. S. Naval Observatory's twin 20-cm astrograph. Positions were also obtained from
the remeasurement of Yale plates (ca. 1930), which were used to determine proper motions.
The catalog should be useful for Earth-based and space navigation, solar system dynamical studies,
occultation predictions, the determination of cometary orbits, and general celestial positional studies.
It is important to understand, however, that the present catalog does not cover the entire zodiacal zone,
since stars south of zone - 29° could not be observed from the Washington site -- these will be observed
from the USNO Black Birch station in New Zealand commencing in 1991.
This documentation describes the machine-readable version of The U. S. Naval Observatory Zodiacal
Zone Catalog as it is currently being distributed from the international network of astronomical data
centers. It is intended to enable users to read and process the data without problems and guesswork,
and it should be used only to supplement the information contained in the source reference. The latter
should be consulted for more detailed information regarding the motivation for construction of the
catalog, the observations, plate measurements, reductions, and a discussion of future work to be done
to complete the entire zodiacal zone. A copy of this document should be transmitted to any recipient
of the machine-readable catalog originating directly from the data centers.
1.2 Source Reference
Douglass, G. G. and Harrington, R. S.
Astron. J., 100, 1712.
1990, The U. S. Naval Observatory Zodiacal Zone Catalog,
Introduction I
2 1157
2.0 Structure
2.1 File Summary
The machine version of The U. S. Naval Observatory Zodiacal Zone Catalog consists of a single data
file only. Table 1 gives the machine-independent file attributes. All logical records are of fixed length,
and, if the catalog is received on magnetic tape, it will contain blocks of fixed length (as noted below)
except that the last block of the fde may be short.
The U. S. Naval Observatory Zodiacal Zone Catalog (Douglass and Harrington 1990)
File Contents Record Logical Record Total Number of
Format Length Logical Records
1 Data FB 96 44435
Table 1. Summary Description of Catalog Files: FB = Fixed length blocks (last may be short)
Note that, while the source reference (Douglass and Harrington 1990) states that ZZCAT contains a
total of 44428 stars, the present machine-readable version actually includes 44435 stars. This is because
the authors retained seven stars having large proper motions that had been removed from the original
version.
The information contained in the above table is sufficient for a user to describe the indigenous charac-
teristics of the machine-readable version of The U. S. Naval Observatory Zodiacal Zone Catalog to a
computer. Information easily varied from installation to installation, such as block size (physical record
length), blocking factor (number of logical records per physical record), total number of blocks, density,
number of tracks and character coding (ASCII, EBCDIC) for tapes, is not included, but should always
accompany secondary copies if any axe supplied to other users or installations.
PRECEDING PAGE BLAS!K NOT FILMED Structure 3
2.2 Catalog (File 1 of 1)
The fde contains all data of the machine-readable Zodiacal Zone Catalog. The data fde is ordered by
J2000.0 fight ascension.
Table 2 gives a byte-by-byte description of the contents of the data file. A suggested Fortran format
specification for reading each data field is included and can be modified depending upon individual
programming and processing requirements (Fortran 77 character string-type formats are used through-
out). Only the DM identifier and spectral-type fields contain character data, for which default values
(latter field only) are always blanks. Note that all numerical data in the catalog are recorded as integers;
however, the format specifications given are intended to read the data as real numbers with the correct
units as given in the table.
Byte(s)
1-11
12-14
15-16
1%18
19-23
24-28
29-31
32-33
34-37
38-42
43-44
45-48
49-57
58-67
68-76
77-86
87-91
92-96
Units
mag
hours
m
8
s yr q
0
x
myr_l
years
hours
0
hours
0
s yr q
yr-1
Suggested
Format
All
F3.1
I2
I2
F5.3
F5.4
13
I2
F4.2
F5.3
A2
F4.2
F9.7
F10.7
F9.7
F10.7
F5.4
F5.3
Default
Value
.°°
99.9
...
Data
DM number
Visual magnitude
Right ascension, it, J2000.0
(I
a
Annual proper motion, l.ta, J2000.0
Declination, g, J2000.0
8
8
Annual proper motion, la_,J2000.0
Spectral type
Epoch- 1900.0
u (J2000.0)
8 (J2000.O)
Right ascension, ct, B 1950.0
Declination, 8, B1950.0
Annual proper motion, laa, B 1950.0
Annual proper motion, la_, B 1950.0
Table 2. Data File Record Format
DM number
Visual magnitude
Equatorial coordinates
Proper motions
Identifier from one of the Durchmusterung (DM) catalogs. A catalog
identifier occurs in bytes 1-2 and identifies the DM as one of the following:
BD Bonner Durchmusterung (Argelander 1859-62, Kiistner 1903,
Schonfeld 1886)
CD Cbrdoba Durchmusterung (Thome 1892-1932)
The DM zone is in bytes 3-5 and the number in bytes 6-10. Byte I1 is
reserved for a lower case DM supplemental identifier.
The visual magnitudes are for reference purposes only and taken almost
exclusively from the SAO Catalog (SAO Staff 1966).
Positions for equator and equinox J2000.0, at the epoch reported in the
catalog, are given in sexigesimal form and again in hours and degrees.
B1950.0 positions are given only in hours and degrees, ff the J2000.0
positions in the two forms are compared, the user should convert hours
and degrees to sexigesimal, not vice versa, since round-off will produce
disagreements if sexigesimal positions are converted to hours and degrees.
Motions are given for J2000.0 and for B1950.0, referred to the FK5 and
FK4, respectively.
4 1157
Spectral type
Epoch
Spectral types are given for reference purposes only and taken almost ex-
clusively from the SAO Catalog.
The value 1900.00 must be added t93he catalog epoch to produce the full
epoch in years.
Structure 5
6 1157
3.0 History
3.1 Remarks and Modifications
The machine-readable Zodiacal Zone Catalog was received on magnetic tape from Dr. R. S. Harrington
of the U. S. Naval Observatory, originally on 2 March 1990. The initial version did not contain
B1950.0 positions and proper motions. However, because of their usefulness for reference purposes,
for cross identifying stars by position in certain earlier catalogs, and due to the complexity of the
transformation from J2000.0 to B1950.0, it was suggested to Dr. Harrington that the B1950.0 data be
retained in the present catalog. With the exception of the fact that the catalog does not now contain
any stars south of 8 = -30 °, the retention of B1950.0 data also means that the new catalog can be
compared more directly with the earlier Zodiacal Catalog (ZC, Robertson 1940). The new catalog will
be complete after the more southerly zodiacal stars to be measured from New Zealand are added.
Minor format modifications were made to the catalog at the Astronomical Data Center in order to place
signs always to occur in the same bytes of each data field, to add "+" signs to positive declinations and
proper motions, and to add DM identifier abbreviations to the Durchmusterung numbers. These
changes were made with the approval of the authors.
PRECEDING PAGE BLAP_K NOT FILMED History 7
8 1157
4.0 Acknowledgments and References
4.1 Acknowledgments
Appreciation is expressed to Dr. R. S. Harrington for supplying The U. S. Naval Observatory Zodiacal
Zone Catalog on magnetic tape, for adding the B1950.0 data, and for his review of and comments on
a draft version of this document. I also wish to thank Dr. Mitsuru SSma of the National Astronomical
Observatory, Tokyo, for pointing out some errors in a previous version of the document.
4.2 References
Argelander, F. W. A. 1859-62, Bonner Sternverzeichniss, erste bis dritte Sektion, Astronomischen
Beobachtungen auf der Sternwarte der K6niglichen Rhein., Friedrich-Wilhelms-Universit/it zu Bonn,
Bfiaade 3-5.
Douglass, G. G. and Harrington, R. S. 1990, The U. S. Naval Observatory Zodiacal Zone Catalog,
Astron. J., 100, 1712.
Fricke, W. and Kopff, A. 1963, Fourth Fundamental Katalog (FK4), Veri_ff. Astron. Rechen-lnst.
Heidelberg No. I0.
Fricke, W., Schwan, H., and Lederle, T. (in collaboration with Bastian, U., Bien, R., Burkhardt, G.,
du Mont, B., Hering, R., Jill-u-ling, R., Jahreiss, H., RSser, S., Schwerdffeger, H. M., and Walter, H.
G.) 1988, Fifth Fundamental Catalogue (FK5), Part I. The Basic Fundamental Stars, Verbff. Astron.
Rechen-Institut Heidelberg No. 32.
K6stner, F. 1903, Bonner Durchmusterung des Nbrdlichen Himmels, zweite berichtigte Auflage, Bonn
Universit_ts Stemwarte (Bonn: A. Marcus und E. Weber's Verlag).
Robertson, J. 1940, Catalog of 3539 Zodiacal Stars for the Equinox 1950.0, Astron. Papers Amer.
Ephemeris 10, Part II (second edition 1967).
SchSnfeld, E. 1886, Bonner Sternverzeichniss, vierte Sektion, Astronomische Beobachtungen auf der
Sternwarte der Kbniglichen Rheinischen Friedrich-Wilhelms-Universit_t zu Bonn 8, Part IV (Bonn:
Adolph Marcus).
Thome, J. M. 1892-1932, C6rdoba Durchmusterung, Resultados del Observatorio Nacional Argentino
16 (1892, Part I: -22 ° to -320); 17 (1894, Part II: -32 ° to -42°); 18 (1900, Part III: -42 ° to
-520); 21 (Part I) (1914, Part IV, -52 ° to -620); 21 (Part II) (1932, Part V: -620 to -90°).
PRECEDi_ PAGE _LAiqK NOT FILMED
Acknowledgments and References
IO 1!57
Appendix A. Sample Listing
The sample listing given on the following pages shows logical records exactly as they are recorded in the
machine-readable version of the catalog. Groups of records from the beginning and end of the t'de are
illustrated. The beginning of each record and the bytes with.in the record are indicated by the column
heading index across the top of each page (digits read vertically).
FRi:'CEOi_qG P,.GE P.LA,_'JK NOT FILMED
Appendix A. Sample Listing ! 1
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The US Naval Observatory Zodiacal Zone Catalog (Douglas and Harrington 1990): Documentation for the machine-readable version

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