*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
I/222 ==OBSOLETE version of Catalogue==
11-Nov-1998: See AC2000, I/247
*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
Query from: http://vizier.cds.unistra.fr/cgi-bin/VizieR?-source=I/222
*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
drwxr-xr-x 317 cats archive 8192 Feb 28 11:16 [Up]
drwxr-xr-x 2 cats archive 216 Jan 12 2023 [TAR file]
-rw-r--r-- 1 cats archive 371 Dec 19 2022 .message
-rw-r--r-- 1 cats archive 31 Nov 11 1998 =obsolete=
-r--r--r-- 1 cats archive 6040 Feb 24 1998 ReadMe
-rw-r--r-- 1 cats archive 8529 Feb 24 1998 notes.gz [Uncompressed]
-r--r--r-- 1 cats archive 4026350 Feb 23 1996 sanfac.dat.gz [txt] [txt.gz] [fits] [fits.gz] [html]
Beginning of ReadMe :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unpublished, (1995)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.