I/161 AGK3R (Smith 1990)
AGK3R Catalogue
Smith C. A. Jr.
<unpublished, 1990>
ADC_Keywords: Positional data
Abstract:
A catalog of positions of reference stars distributed uniformly on the
celestial sphere north of declination -5 deg. contains meridian
observations of 21,499 stars with a mean epoch 1958.5. This catalog
was compiled from more than 300,000 observations made with 11 northern
meridian circles during the period 1956 to 1963. The observations are
on the FK4 system.
Introduction:
There is a need for reference catalogs with good modern positions.
Recently, positions were redetermined for Northern Hemisphere
reference stars to form the AGK3R catalog that was used to determine
the plate constants for the AGK3 Photographic Catalog (Dieckvoss
1975). The AGK3R catalog contains 21,499 stars evenly distributed on
the surface of the celestial sphere from -5 deg. to +90 deg. The
observations were made with 11 northern meridian circles during the
period 1956 to 1963. Stars were selected from two lists: one selected
at the U. S. Naval Observatory and the other at the Pulkovo
Observatory and the Sternberg Institute. The participating
observatories were Bergedorf, Bordeaux, Greenwich, Heidelberg,
Nicolaev, Ottawa, Paris, Pulkovo, Strasbourg, and the U. S. Naval
Observatory (Smith, 1980). Both the seven-inch and the six-inch
transit circles were employed at the U. S. Naval Observatory. All
observations were reduced on a nightly basis by the observers to the
FK3R system and, later to the FK4 either by the observer himself or at
the U.S. Naval Observatory.
File Summary:
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FileName Lrecl Records Explanation
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ReadMe 80 . This file
agk3r.dat 72 21499 The Catalogue
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Byte-by-byte Description of file: agk3r.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- AGK3R *[1/21499]+ AGK3R number
6 A1 --- lcode *[CSZ] List code
7- 11 I5 --- ObsId [1/21505] AGK3R number in the observing list
12- 19 A8 --- BD *BD identification (I/122 and I/119)
20- 22 F3.1 mag Pmag Photographic Magnitude
23- 24 A2 --- Sp *Spectral type
25- 26 I2 h RAh Right ascension, hours (1950)
27- 28 I2 min RAm Right ascension, minutes (1950)
29- 34 F6.3 s RAs Right ascension, seconds (1950)
35- 41 F7.4 s e_RAs Mean error of RA reduced to equator
42- 43 I2 --- o_RAs No. observations in right ascension
44- 49 F6.3 yr EpRA-1900 Epoch of right ascension - 1900.000
50 A1 --- DE- Declination sign (1950)
51- 52 I2 deg DEd Declination, degrees (1950)
53- 54 I2 arcmin DEm Declination, minutes (1950)
55- 59 F5.2 arcsec DEs Declination, seconds (1950)
60- 64 F5.2 arcsec e_DEs Mean error of declination.
65- 66 I2 --- o_DEs No. Observations in declination.
67- 72 F6.3 yr EpDE-1900 Epoch of declination. - 1900.000
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Note on AGK3R:
Four stars appeared twice in the original AGK3R observing list under
different serial numbers. The data from the duplicate stars have been
combined and the stars renumbered (AGK3R numbers). The duplicate stars
removed and the number assigned in the new numbering system are as
follows:
Current AGK3R Number Duplicate AGK3R Numbers
in Observing List
-------------------------------------------------------
1930C 1931, 1932
2405C 2407, 2408
2951C 2954, 2955
3633C 3637, 3638
-------------------------------------------------------
Note on lcode:
S = U. S. Naval Observatory List
Z = Pulkovo Observatory and Sternberg Institute List
C = Both lists
Note on BD:
The only star without a BD number is 1135Z. It was formerly listed as
BD-01 170A but has no connection with BD-01 170.
Note on Sp:
An & in byte 23 indicates that the spectrum is composite. The types for
these stars are as follows:
AGK3R Number Spectral Types
---------------------------------------
4536C A + G
4996S F8 + A0
5217S A0 + G0
5739S F0 + A2
6063S F5 + A5
6123S F5 + A3
6324S F5 + A
6754S A2 + G
7251S F2 + A2
8698S F2 + A2
10048S F5 + A5
11154S F5 + A3
12871S F5 + A0
13650S A2 + G
16982S A0 + G
17619S K0 + A0
17641S F5 + B8p
18095S G0 + A
18453S F5 + A3
18727S K0 + A2
19812S G5
20257S A3 + G
---------------------------------------
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Additional Information:
Changes in the catalog as received from the U.S. Naval Observatory
have been minor. The false DM number was removed for 1135Z and several
bytes were changed to make their meaning more obvious to the user.
Bytes 66 - 80 were dropped. In the version received, bytes 66 - 75
were blank and bytes 66 - 80 contained only the second numbers for the
stars that had duplicate entries . The spectral types for the stars
with composite spectra were obtained from the Henry Draper Catalogue
or the Transactions of the Yale University Observatory v.25.
We thank Clayton A. Smith for assistance with the preparation of this
document.
References:
Argelander F.W.A. 1859-1862, Bonner Sternverzeichniss, erste bis dritte
Sektion, Astronomischen Beobachtungen auf der Sternwarte des
Koeniglichen Rhein., Friedrich-Wilhelms-Universitaet zu Bonn, Baende
vol.3.-vol.5.. (Cat. I/122)
Barney I. 1954, Revised Catalogue of 8703 Stars, +20 deg. to +25 deg.,
Trans. Astron. Obs. Yale Univ. vol.25 (see Cat. I/141)
Becker F. 1949, Bonner Durchmusterung, Suedlicher Teil,
Deklinations-Zonen -2 deg. bis -22 deg. Sternverzeichnis, zweite,
berichtigte Auflage, Ferd. Duemmlers Verlag, Bonn.
(See cat. I/119)
Becker F. 1951, Bonner Durchmusterung, Noerdlicher Teil,
Deklinations-Zonen -1 deg. bis +89 deg. Sternverzeichnis, dritte,
berichtigte Auflage, Ferd. Duemmlers Verlag, Bonn.
(See cat. I/122)
Cannon A. J. and Pickering E. C. 1918-1924, The Henry Draper
Catalogue, Ann. Astron. Obs. Harvard College, vol.91-99..
(Cat. III/135)
Dieckvoss W. (in collaboration with H. Kox, A. Guenther and E.
Brosterhus) 1975, AGK3 Star Catalog of Positions and Proper Motions
North of -2.5 deg. Declination, Hamburg-Bergedorf.
(see Cat. I/61)
Kuestner F. 1903, Bonner Durchmusterung des Noerdlichen Himmels, zweite
berichtigte Auflage, Bonn Universitaets Sternwarte, A. Marcus und E.
Weber's Verlag, Bonn.
(See cat. I/122)
Schoenfeld E. 1886, Bonner Sternverzeichniss, vierte Sektion,
Astronomische Beobachtungen auf der Sternwarte der Koeniglichen
Rheinischen Friedrich-Wilhelms-Universit a dotdot:ef.t zu Bonn vol.8.,
Part IV, Adolph Marcus, Bonn.
(Cat. I/119)
Scott F. P. and Smith C. A. Jr. 1971, Comparison of the SAO and AGK3R
Star Catalogues, ed. Eichhorn H. K., NASA CR-1825, Conference on
Photographic Astrometric Technique.
Smith C. 1980, The International Reference Star Programs, Mitt. Astron.
Ges. Nr. 48.
(End) Nancy Grace Roman [ADC/SSDOO] Dec-8-95 J.A. Watko [SSDOO/ADC] 27-Dec-1995