/ftp/cats/I/223



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I/223   ==OBSOLETE version of Catalogue==
11-Nov-1998: See AC2000, I/247
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Query from: http://vizier.cds.unistra.fr/cgi-bin/VizieR?-source=I/223
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drwxr-xr-x 317 cats archive 8192 Feb 28 11:16 [Up] drwxr-xr-x 2 cats archive 215 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 5847 Feb 24 1998 ReadMe -r--r--r-- 1 cats archive 3768615 Feb 23 1996 algac.dat.gz [txt] [txt.gz] [fits] [fits.gz] [html] -rw-r--r-- 1 cats archive 9330 Feb 24 1998 notes.gz [Uncompressed]
Beginning of ReadMe : I/223 Algiers AC Zone Data Reduced to ACRS (Urban+ 1995) ================================================================================ Algiers AC Zone Data Reduced to ACRS Urban S.E., Jackson E.S., Corbin T.E. <unpublished (1995)> ================================================================================ ADC_Keywords: Astrographic zones - 135; 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 Algiers Zone, whose plates are centered between declinations -2 and +4 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 199,000 stars on eq. J2000.0, epoch of observation. The plate were exposed between 1891 and 1912. For cross-identification purposes, all stars have been matched with the Tycho Input Catalog (revised); those numbers have been added to each record.