/ftp/cats/1/243



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I/243   ==OBSOLETE version of Catalogue==
05-Oct-2003: See USNO-A2.0 = I/252
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=I/243
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drwxr-xr-x 317 cats archive 8192 Feb 28 11:16 [Up] drwxr-xr-x 2 cats archive 269 Jan 13 2023 [TAR file] -rw-r--r-- 1 cats archive 375 Dec 19 2022 .message -rw-r--r-- 1 cats archive 35 Oct 5 2003 =obsolete= -r--r--r-- 1 cats archive 4755 Nov 3 1998 ReadMe -r--r--r-- 1 cats archive 5600 Nov 3 1998 out.sam -r--r--r-- 1 cats archive 8326 Sep 25 1996 read.ast -r--r--r-- 1 cats archive 12242 Oct 29 1996 read.me -r--r--r-- 1 cats archive 11096 Sep 25 1996 read.pht -r--r--r-- 1 cats archive 29134 Sep 25 1996 read.pmm
Beginning of ReadMe : I/243 The PMM USNO-A1.0 Catalogue (Monet 1997) ================================================================================ A Catalog of Astrometric Standards Monet D., Canzian B., Harris H., Reid N., Rhodes A., Sell S. <US Naval Observatory Flagstaff Station (1997)> ================================================================================ ADC_Keywords: Surveys ; Photographic catalog ; Photometry, photographic ; Abstract: USNO-A1.0 is a catalog of 488,006,860 sources whose positions can be used for astrometric references. These sources were detected by the Precision Measuring Machine (PMM) built and operated by the U. S. Naval Observatory Flagstaff Station during the scanning and processing of the Palomar Observatory Sky Survey I (POSS-I) O and E plates, the UK Science Research Council SRC-J survey plates, and the European Southern Observatory ESO-R survey plates. The PMM detects and processes at and beyond the nominal limiting magnitude of these surveys, but the large number of spurious detections requires that a filter be used to eliminate as many as possible. USNO-A's sole inclusion requirement was that there be spatially coincident detections (within a 2 arcsecond radius aperture) on the blue and red survey plate. For field centers of -30 degrees and above, data come from POSS-I plates, while data from field centers of -35 and below come from SRC-J and ESO-R plates.