I/222 San Fernando AC Zone Data Reduced to ACRS (Urban+ 1995)
San Fernando AC Zone Data Reduced to ACRS
Urban S. E., Wycoff G. L., and Corbin T. E.
<unpublished, (1995)>
ADC_Keywords:
Astrographic zones - 135; Astrometric data - 140;
Combined data - 240; Cross identifications - 255; Finding lists - 280;
Historical catalog - 343; Magnitudes, photographic - 380;
Photographic catalog - 460; Plate areas - 645; Plate data - 650;
Positional data - 660; Regional catalog - 705; Surveys - 975
Abstract:
The U.S. Naval Observatory is in the process of making new reductions
of the Astrographic Catalogue (AC) using a modern reference system,
the ACRS, which represents the system of the FK5.
The data from the San Fernando Zone, whose plates are centered between
declinations -3 and -9 degrees (eq. 1900), have been analyzed for
scale, rotation, tilt, coma, magnitude equation, radial distortion and
distortions introduced by the use of reseaux in the Carte du Ciel
program. The result is a positional catalog of over 225,000 stars on
eq. J2000.0, epoch of observation. Additionally, all stars have been
matched with the Tycho Input Catalog (revised); those numbers have
been added for additional identification purposes.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
sanfac.dat 97 225579 San Fernando AC stars reduced using ACRS
notes 135 429 Notes on the AC/Tycho matches
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See also:
I/171 : the Astrographic Catalog Reference Stars (ACRS, Corbin et al., 1991)
I/197 : Tycho Input Catalogue, Revised version (TIC, Egret et al., 1992)
I/219 : Cape AC Zone (-41 to -51) Reduced to ACRS (Urban & Corbin, 1995)
I/223 : Algiers AC Zone (+4 to -2) Reduced to ACRS (Urban et al., 1995)
I/224 : Oxford 1 AC Zone (+25 to +31) Reduced to ACRS (Urban et al., 1996)
I/225 : Oxford 2 AC Zone (+32 to +33) Reduced to ACRS (Urban et al., 1996)
I/226 : Vatican AC Zone (+55 to +64) Reduced to ACRS (Urban et al., 1996)
I/227 : Paris AC Zone (+18 to +24) Reduced to ACRS (Urban et al., 1996)
I/228 : Bordeaux AC Zone (+11 to +17) Reduced to ACRS (Urban et al., 1996)
I/231 : Uccle AC Zone (+05 to +11) Reduced to ACRS (Urban et al., 1996)
I/232 : Toulouse AC Zone (+34 to +35) Reduced to ACRS (Urban et al., 1996)
Byte-by-byte Description of file: sanfac.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right Ascension J2000.0 (hours)
4- 5 I2 min RAm Right Ascension J2000.0 (minutes)
7-12 F6.3 s RAs Right Ascension J2000.0 (seconds)
14 A1 --- DE- [-] Declination J2000.0 (sign)
15-16 I2 deg DEd [01-10] Declination J2000.0 (degrees)
18-19 I2 arcmin DEm Declination J2000.0 (minutes)
21-25 F5.2 arcsec DEs Declination J2000.0 (seconds)
28-32 F5.2 mag B(mag) Magnitude from image diameter
34-41 F8.3 yr Ep(RA) Mean epoch of position, RA
43-50 F8.3 yr Ep(Dec) Mean epoch of position, Dec
51-52 I2 --- Num Number of images used
53-58 F6.3 arcsec e_RAs ?Mean error (Right Ascension)
59-64 F6.3 arcsec e_DEs ?Mean error (Declination)
66-73 I8 --- ISN *Internal Star Number ID
75-82 I8 --- ACRS ?ACRS number
84-92 I9 --- TICr ?Tycho Input Catalog (rev) I/197 number
94-97 I4 --- NoteID *[1/383]? Note detailed in file notes
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Note on ISN:
The Internal Star Number, ISN, is used in the reduction process to
identify all images of the same star that may appear on different
plates. This is generated at U.S. Naval Observatory (USNO) and
added on to the original x,y data. When the original data are
released by USNO, this number can be used to link the original data
to the final catalog.
Note on NoteID:
Detailed notes concerning possible errors in the AC/Tycho matches
can be found in the file notes.
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Byte-by-byte Description of file: notes
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Bytes Format Units Label Explanations
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1- 4 I4 --- NoteID [1/383]+= Number from NoteID in sanfac.dat
5-135 A131 --- Note Footnote for this star
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Historical Notes:
* 15-Jan-1996: (by Sean E. Urban)
the way mean errors are computed were changed.
References:
New Reductions of the Astrographic Catalogue: Conventional Plate
Adjustment of the Cape Zone, Urban S.E. and Corbin T.E.
Astronomy and Astrophysics, January, 1996, in press
The U.S. Naval Observatory Astrographic Catalog Project, Urban, S.E.
and Corbin, T.E., Galactic and Solar System Optical Astrometry,
ed. Morrison and Gilmore, Camb. Univ. Press, p. 11, 1994
(End) Sean E. Urban [U.S. Naval Observatory] 14-Nov-1995