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Optical Positions of Extragalactic Radio Sources Using the UCAC112

Published online by Cambridge University Press:  12 April 2016

M. Assafin ,
N. Zacharias ,
A.H. Andrei  and
R. Vieira Martins
M. Assafin
Affiliation:
Depto. de Astronomia - Observatório do Valongo, Universidade Federal do Rio de Janeiro, Rua Ladeira Pedro Antonio, 43 CEP 20080-090 Rio de Janeiro, [email protected]
N. Zacharias
Affiliation:
US Naval Observatory, 3450 Massachusetts Avenue, NW, Washington DC 20392
A.H. Andrei
Affiliation:
Observatório Nacional - Rua General José Cristino, 77 CEP 20921-400 Rio de Janeiro - RJ, Brazil
R. Vieira Martins
Affiliation:
Observatório Nacional - Rua General José Cristino, 77 CEP 20921-400 Rio de Janeiro - RJ, Brazil

Extract

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Extragalactic 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 Laboratório Nacional de Astrofísica, Brazil (LNA). The observations started in 1997 and were carried out in a joint program between USNO, Observatório do Valongo/UFRJ, Brazil, and Observatório 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° and −70° 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.

Type
Section 1. Celestial Reference System and Frame
Information
International Astronomical Union Colloquium , Volume 180: Towards Models and Constants for Sub-Microarcsecond Astrometry , March 2000 , pp. 68 - 74
Copyright
Copyright © US Naval Observatory 2000

Footnotes

1

Based in part on observations made at Laboratório Nacional de Astrofísica/CNPq/MCT

1

Based in part on observations made at Cerro Tololo Inter-American Observatory (CTIO)

References

Assafin, M., Vieira Martins, R., Andrei, A.H., 1997, Astron. J., 113, 1451.CrossRefGoogle Scholar
Zacharias, N., Zacharias, M.I., Hall, D.M., Johnston, K.J., de Vegt, C., Winter, L., 1999, Astron. J., 118, 2511.CrossRefGoogle Scholar
Zacharias, N. et al., 2000, Astron. J. (submitted).Google Scholar