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I/171 Astrographic Catalog Reference Stars (ACRS) (Corbin+ 1991)
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Astrographic Catalogue Reference Stars
Corbin T.E., Urban S.E., Warren Jr. W.H.
<NASA, NSSDC 91-10 (1991)>
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ADC_Keywords: Positional data ; Proper motions
Description:
The ACRS is an all-sky catalog of positions and proper motions that is
based on the AGK3 in the north and on the newly completed second Cape
Photographic Catalogue (CPC2, de Vegt et al. 1989) in the south. The
astrometric data are on the system of the International Reference
Stars (IRS, catalog <I/172>), compiled on B1950.0 FK4 and then
transformed to J2000.0 FK5. The ACRS contains 320,111 stars, the mean
positions for which were derived from a total of 1,643,783 individual
input positions.
The catalog is divided into two parts. Part 1 contains stars having
better observational histories and, therefore, more reliable positions
and proper motions, while the stars in Part 2 have poor histories and
consist mostly of objects for which only two catalog positions in one
or both coordinates were available for computing proper motions. For
Part 1, which consists of 78 percent of the catalog, the mean errors
of the proper motions in right ascension and declination are 0.47 and
0.46 seconds of arc/century (4.7 and 4.6 mas/yr), respectively.
It is intended that, as more observations are accumulated for stars in
Part 2, they will be migrated to Part 1.
The catalog was compiled at the U.S. Naval Observatory, Washington,
D.C., for purposes of performing new reductions of the Astrographic
Catalogue plates. Additional details about the construction of the
ACRS may be found in Corbin and Urban (1989).
The data included are catalog part, ACRS number, equatorial
coordinates (equinox, equator, epoch B1950.0 and J2000.0),
proper motions (B1950.0 and J2000.0), original epochs, weights for
right ascension and declination, and reference data such as DM numbers
(BD, CD, CPD), AGK3 and CPC2 designations, and an IAU recommended ACRS
identifier (based on coordinates).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
acrs.doc 80 442 ASCII documentation
acrs.tex 80 443 LaTeX documentation
adc.sty 78 68 LaTeX Style file to process acrs.tex
acrs1.dat 192 250052 Part 1: more reliable stars
acrs2.dat 192 70159 Part 2: stars with poor observational history
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See also:
I/15 : FK4 Catalogue (Fricke and Kopff, 1963)
I/72 : AGK3R Catalogue (Corbin, 1978)
I/85 : CPC2 (2nd Cape Photographic Catalogue 1950, Nicholson et al., 1984)
I/172 : IRS (International Reference Stars, Corbin, 1991)
I/149 : FK5 Catalogue (Fricke et al., 1988, Veroff. ARI 32)
I/219 : Cape AC Zone (-41 to -51) Reduced to ACRS (Urban & Corbin, 1995)
I/222 : San Fernando AC Zone (-3 to -9) (Urban et al., 1995)
I/223 : Algiers AC Zone (+4 to -2) Reduced to ACRS (Urban et al., 1995)
Byte-by-byte Description of file: acrs1.dat, acrs2.dat
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Bytes Format Units Label Explanations
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1 I1 --- PartNum [1,2] Catalog Part number, '1' or '2'
2- 7 I6 --- ACRS *[1,570159]+ ACRS sequential number
9- 10 I2 h RAh Hours RA, equinox=B1950, Epoch=B1950.0
11- 12 I2 min RAm Minutes RA, equinox, epoch B1950.0
13- 17 I5 ms RAms Seconds RA, equinox, epoch B1950.0
18 A1 --- DE- Sign Dec, equinox, epoch B1950.0
19- 20 I2 deg DEd Degrees Dec, equinox, epoch B1950.0
21- 22 I2 arcmin DEm Minutes Dec, equinox, epoch B1950.0
23- 26 I4 10mas DEcs Seconds Dec, equinox, epoch B1950.0
27- 29 I3 ms e_RAms ?Mean error in RA at original epoch
30- 32 I3 10mas e_DEcs ?Mean error in Dec at original epoch
33- 38 I6 0.01ms/yr pmRA RA proper motion, FK4 system
39- 45 I7 0.1mas/yr pmDE DE proper motion, FK4 system
46- 49 I4 0.01ms/yr e_pmRA ?Mean error on pmRA
51- 53 I3 0.1mas/yr e_pmDE ?Mean error on pmDE
54- 60 I7 0.001yr EpRA Original epoch of RA
(epoch mean position)
61- 67 I7 0.001yr EpDE Original epoch of DE
(epoch mean position)
68- 70 I3 --- o_RAms Number of positions in RA
71- 73 I3 --- o_DEcs Number of positions in DE
74- 77 I4 0.1 w_RAms Sum of the weights in RA
78- 81 I4 0.1 w_DEcs Sum of the weights in DE
82- 86 I5 0.01mag Pmag [140/1350]?=9999 Photographic magnitude
87- 89 A3 --- SpType Spectral type
90- 97 A8 --- BD Bonner Durchmusterung number <I/122>
98-105 A8 --- CD Cordoba Durchmusterung number <I/114>
106-113 A8 --- CP Cape Photographic Durchmusterung
<I/108>
114-120 A7 --- AGK3 AGK3 number <I/61>
121-126 A6 --- CPC2 Second Cape Photograpic Catalog <I/85>
127-150 A24 --- ACRSJ *ACRS number, ACRS Jhhmmss.ssSddmmss.s
151-152 I2 h RA2000h *Hours RA, Equinox=J2000, Epoch=J2000
153-154 I2 min RA2000m *Minutes RA, equinox, epoch J2000.0
155-159 I5 ms RA2000ms *Seconds RA, equinox, epoch J2000.0
160-165 I6 0.01ms/yr pmRA2000 Centennial RA proper motion, J2000.0
166-171 I6 0.001yr EpRA-J2000 *Original epoch - J2000.0 in RA
172 A1 --- DE2000- Sign Dec, equinox, epoch J2000.0
173-174 I2 deg DE2000d *Degrees Dec, equinox, epoch J2000.0
175-176 I2 arcmin DE2000m *Minutes Dec, equinox, epoch J2000.0
177-180 I4 10mas DE2000cs *Seconds Dec, equinox, epoch J2000.0
181-186 I6 0.1mas/yr pmDE2000 Centennial Dec proper motion, J2000.0
187-192 I6 0.001yr EpDE-J2000 *Original epoch - J2000.0 in DE
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Note on ACRS:
This number is between 1 and 250052 for the first part,
between 500001 and 570159 for Part 2.
Note on RA2000h, RA2000m, RA2000ms, DE2000d, DE2000m, DE2000cs:
The J2000 positions are given for equinox and epoch J2000.0 on the
system of FK5 after transformation of the B1950.0 values. The
transformation was done using the coefficients and software package of
Schwan (see Schwan 1988) and the algorithm given in the 1991
Astronomical Almanac (page B42) (foreshortening terms set to zero).
(See Section 3.1 of the documentation for additional details.)
Note on ACRSJ:
This identifier is based upon the recommended IAU nomenclature (see
PASP, 102, 1444, 1990). The field consists of an origin in bytes
127-130 (ACRS) and a coordinate specification in bytes 132-150 (byte
132 contains a "J" to indicate that the following coordinates are in
the Julian reference system and are for the year 2000.0, the standard
equinox designated for Julian system coordinates).
Note on EpRA-J2000, EpDE-J2000:
These values are wrong for values larger than 1 century (when the
corresponding epoch is before 1900); this occurs for ACRS
86508, 240650, 533151.
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References:
Corbin, T.E., and Urban, S.E. 1989, in Star Catalogues: A Centennial
Tribute to A. N. Vyssotsky (Schenectady, L. Davis Press), p. 59
de Vegt, Ch., Zacharias, N., Murray, C.A., and Penston, M.J. 1989, in Star
Catalogues: A Centennial Tribute to A. N. Vyssotsky (Schenectady, L.
Davis Press), p. 45
(Catalog: <I/85>)
Schwan, H., =1988A&A...198..363S
Historical Notes:
* 03-Apr-1991: the completed machine-readable ACRS was transferred to
the Astronomical Data Center (NASA/Goddard)
* Catalogue distributed on the "Selected Astronomical Catalogs" Vol. 1
CD-ROM (1991), directory /astrom/acrs
* 29-Nov-1995: data files checked, and ReadMe file standardized at CDS
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(End) Gail L. Schneider [SSDOO/ADC], Francois Ochsenbein [CDS] 29-Nov-1995