Ground-based astrometry with the ASPHO: optical-radio reference systems connection.

Details Ground-based astrometry with the ASPHO: optical-radio reference systems connection. Ground-based astrometry with the ASPHO: optical-radio reference systems connection.

Nov 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003ala..conf..105m&link_type=abstract

Astronomy in Latin America, Second Meeting on Astrometry in Latin America and Third Brazilian Meeting on Fundamental Astronomy,

Astronomy and Astrophysics

Astronomy

Scientific paper

Precise positions and proper motions of optical counterparts of radiostars are needed in order to determine a direct link between the radio reference frame (VLBI - Very long Baseline Interferometry) and the ground-based optical reference frame (based on fundamental stars) (Poma & Zanzu 1991, Kovalevsky 1990, Walter et al. 1990). The basic problems are concerning with the optical-radio systems connection and the quick deterioration that he Hipparcos system is subjected. Thus, there is a request of exact and systematic observations with the instruments in the Earth (Kovalevsky 1990). Radiostars are suitable intermediaries for linking optical stellar reference frame to the quasi-inertial radio reference frame (RRF) represented by compact extragalactic radio sources. With the goal of the connection radio-optical reference frames the observational programme has included a total of 36 radiostars.

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