Astrometrical and photometrical observations of extragalactic radio-sources with the Valinhos CCD meridian circle

Details Astrometrical and photometrical observations of extragalactic radio-sources with the Valinhos CCD meridian circle Astrometrical and photometrical observations of extragalactic radio-sources with the Valinhos CCD meridian circle

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998larm.confe.160t&link_type=abstract

"IX Latin American Regional IAU Meeting, "Focal Points in Latin American Astronomy", held in Tonantzintla, Mexico, Nov 9-13, 199

Astronomy and Astrophysics

Astronomy

Scientific paper

Since 1986 we have been regularly observed with the Valinhos CCD meridian circle some bright extragalactic radio-sources belong to the ICRF. These observations aim the highest accuracy possible in the linking between the extragalactic reference frame and star position and the photometrical variability. The astrometrical and photometrical precisions are about 50 mas in both coordinates and 0.05 magnitudes. We present here the light curve for some sources and the differences between CCD and radio positions. We present too a discussion about our results.

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