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I/21A Astrographic Catalogue (AC), +05/+31deg (Lacroute+ 1981)
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Astrographic Catalogue: Toulouse, Bordeaux, Paris and OxfordI zones
Lacroute P., Valbousquet A.
<Bull. Inform. CDS 6 (1974)>
=1974BICDS...6...38L
Valbousquet A.
<Bull. Inform. CDS 13, 2 (1977)>
=1977BICDS..13....2V
Lacroute P.
<Bull. Inform. CDS 21, 2 (1981)>
=1981BICDS..21....2L
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ADC_Keywords: Astrographic zones ; Magnitudes, photographic ; Positional data
Description:
The "Carte du Ciel" (or "Astrographic Catalogue") is a catalogue of
star positions and magnitudes, determined on the photographic plates
taken by the normal astrographs which are installed in observatories
of various latitudes, as a world-wide astronomical project (see
Eichhorn, 1974, p279). The catalogue is divided into 22 declination
zones, each of which is assigned to each observatory, e.g., a zone
from +18 to +24 degrees is to Paris observatory.
Each observatory has taken photographs of 2 deg x 2 deg area in and
covering each zone, measured the X,Y coordinates of star images on the
photographic plates, and published the results as the printed
catalogues. The present catalogue is the results of reduction of these
X,Y coordinates into right ascension and declination values, for
declination zones of +05 to +31, by using AGK2/3 catalogue as the
reference.
The participated observatories and the archived files are as follows:
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declination zone observatory file
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+05 to +10 Toulouse f05-11
+11 to +17 Bordeaux f11-17
+18 to +24 Paris f18-24
+25 to +31 Oxford I f25-31
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Note that +11 degree zone is also observed by Toulouse, and the
results are included in the file f05-11.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
f05-11 57 433414 Toulouse zone (+05 to +10 and +11 degree)
f11-17 57 355653 Bordeaux zone (+11 to +17 degree)
f18-24 57 436454 Paris zone (+18 to +24 degree)
f25-31 55 471421 Oxford I zone (+25 to +31 degree)
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Byte-per-byte Description of file: f05-11 f11-17 f18-24
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Bytes Format Unit Label Explanation
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1- 2 I2 deg ZONE *[5/24] zone identifier
3- 5 I3 --- PLATE *[1/999] plate identifier
6 A1 --- HYPH [-] hyphen
7- 10 I4 --- STAR running number of star on the plate
13- 14 I2 h RAh right ascension (hours) (B1950)
16- 17 I2 min RAm right ascension (minutes)
19- 24 F6.3 s RAs ascension (seconds)
25 A1 --- DE- declination sign
26- 27 I2 deg DEd declination (degrees) (B1950)
29- 30 I2 arcmin DEm declination (minutes)
32- 36 F5.2 arcsec DEs declination (seconds)
37- 43 F7.2 a EPOCH [1800/2000] plate epoch
44- 47 F4.1 mag Pmag photographic magnitude
48- 55 A8 --- AGK2 *[-+ 0-9] AGK2 number
56- 57 A2 --- m_AGK2 [0-9.] suffix to the AGK2 number, if needed
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Note on ZONE: declination zone, or
the declination of the center of each astrographic plate
Note on PLATE: running number of plate in the zone.
Note that zones lower from 27 deg have generally 180 plates, and
those higher from 28 deg have 160 plates.
Note on AGK2: AGK2 number, if AGK2/3 star was identified
Note that this is incomplete.
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Byte-per-byte Description of file: f25-31
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Bytes Format Unit Label Explanation
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1- 2 I2 deg ZONE *[25/31] zone identifier
3- 5 I3 --- PLATE *[1/999] plate identifier
6 A1 --- HYPH [-] hyphen
7- 11 I5 --- STAR *[1/99999] running number of star on plate
13- 14 I2 h RAh right ascension (hours) (B1950)
16- 17 I2 min RAm right ascension (minutes)
19- 24 F6.3 s RAs right ascension (seconds)
25 A1 --- DE- declination sign
26- 27 I2 deg DEd declination (degrees) (B1950)
29- 30 I2 arcmin DEm declination (minutes)
32- 36 F5.2 arcsec DEs declination (seconds)
37- 43 F7.2 a EPOCH [1800/2000] plate epoch
44- 47 F4.1 mag Pmag photographic magnitude
48- 55 A8 --- AGK2 *[-+ 0-9] AGK2 number, if AGK2/3 star was
identified (Note that this is incomplete)
56- 57 A2 --- m_AGK2 [.0-9] suffix to the AGK2 number, if needed.
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Note on ZONE: declination zone, or
the declination of the center of each astrographic plate
Note on PLATE: running number of plate in the zone.
Note that zones lower from 27 deg have generally 180 plates, and
those higher from 28 deg have 160 plates.
Note on STAR:
Note that this number in the Oxford I zone is so determined to be
unique in a whole zone (e.g., in the zone +25 deg.).
Note on AGK2: AGK2 number, if AGK2/3 star was identified
Note that this is incomplete.
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See Also:
I/22 : Zones -02 to +04 (Alger zones) (Lacroute and Valbousquet, 1974)
I/154 : Zones -02 to +31 degrees of AC (Roeser, 1990) (RA and DE files)
I/155 : Zones -02 to +31 degrees of AC (Roeser, 1990) (X and Y files)
I/171 : Astrographic Catalog Reference Stars (ACRS) (Corbin+ 1991)
References:
Eichhorn, H. (1974): Astrometry of Star Positions,
Frederick Unger Publ. Co., New York.
Historical Notes:
* Originally the Paris zone was archived as I/22, and the Alger zone
was included in I/21. However, the data format of Alger zone is
different from others and the data have some incompleteness, and we
rearranged them, separating the Alger zone data as I/22A. See <I/22>
* 24-Sep-1993 Catalogue documented by Koichi Nakajima
<nakajima@higashi.hit-u.ac.jp>
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(End) Koichi Nakajima [CDS] 24-Sep-1993