NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-19 T01:08:39 PDT
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For refcode 2000AJ....119.1470D:
Retrieve 315 NED objects in this reference.
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NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
2000AJ....119.1470D OPTICAL POSITIONS FOR A SAMPLE OF ICRF SOURCES DARIO N. DA SILVA NETO, A. H. ANDREI, AND R. VIEIRA MARTINS Observatorio Nacional, CNPq, Rua General Jose Cristino 77, 20921-030 Sao Cristovao, RJ, Brazil AND M. ASSAFIN Observatorio do Valongo, Universidade Federal do Rio de Janeiro, Ladeira Pedro Antonio 43, 20080-090 Rio de Janeiro, RJ, Brasil Received 1999 July 20; accepted 1999 November 23 ABSTRACT The aim of this paper is to present a large, coherent set of astrometric optical positions for ICRF sources in the Hipparcos reference frame. For this, we present positions for 315 ICRF sources measured in Digitized Sky Survey (DSS) images, with positions referred to the ACT, Hipparcos, and Tycho catalogs. The reductions were made relative to Hubble Space Telescope guide stars, which were previously corrected toward those same catalogs. The reductions errors are at 45 mas and even smaller for southern sources. The comparison between optical with ICRF radio positions shows that neither the residuals nor the internal errors exhibit any trend with magnitudes or with location on the DSS plates. Key words: astrometry-reference systems
Retrieve 315 NED objects in this reference.
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