| Apresentação/Painel: | |
| Autor: | J.I.B. Camargo1,2 |
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Marcelo Assafin2
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A.H. Andrei1,2
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Roberto Viera Martins1,2
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D.N. da Silva Neto3
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| Instituição: | 1ON/MCT - Rio de Janeiro |
| 2OV/UFRJ - Rio de Janeiro | |
| 3Universidade Estadual da Zone Oeste - Rio de Janeiro | |
| Formato: | Painel |
| Título: | On the differences between the optical and radio positions of ICRF2 sources |
| Resumo: | The current IAU's fundamental celestial frame is the second realization of the International Celestial Reference Frame - ICRF2. It contains a few thousands of very precise positions of extragalactic objects, as determined by VLBI techniques. However, only selected 295 such objects are used to define the fundamental directions. The others have consistent positions with the defining ones and are important to densify the frame. From o bservations of a set of ICRF2 sources with SOAR/SOI we show that some large optical/VLBI position differences are just a consequence of the source's physical nature. |
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