Optical Positions of Extragalactic Radio Sources Using the UCAC1
Abstract
Extra-galactic radio source positions referred to the first USNO CCD Astrograph Catalog (UCAC1) are presented. They were derived from CCD observations taken with the 1.6-meter Cassegrain telescope at the Laboratorio Nacional de Astrofisica, Brazil (LNA). The observations started in 1997 and were carried out in a joint program between USNO, Observatorio do Valongo/UFRJ, Brazil, and Observatorio Nacional/CNPq, Brazil. They were planned to provide, together with CTIO observations, fiducial points to link the UCAC to the ICRF. The results presented here refer to 24 radio source targets distributed mainly between -30 degrees and -70 degrees declinations. Reduction techniques follow standard procedures. The results are compared with VLBI and with similar precise optical positions, in order to contribute to the evaluation of the UCAC astrometry.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 2000
- Accession Number
- ADA435501
Entities
People
- A. H. Andrei
- M. Assafin
- Norbert Zacharias
- R. V. Martins
Organizations
- United States Naval Observatory