The catalogue of positions of optically bright extragalactic radio sources OBRS-1
Leonid Petrov

TL;DR
This paper presents a catalog of 105 extragalactic radio sources with milliarcsecond positional accuracy, supporting the comparison of optical and radio coordinate systems crucial for validating space-based astrometry.
Contribution
It provides the first detailed catalog of positions for these sources, enhancing the robustness of radio-optical coordinate system comparisons.
Findings
Median positional accuracy of 1.1 mas
Coordinates range from 0.3 to 7 mas
Supports validation of astrometric techniques
Abstract
It is expected that the European Space Agency mission Gaia will make possible to determine coordinates in the optical domain of more than 500000 quasars. In 2006, a radio astrometry project was launched with the overall goal to make comparison of coordinate systems derived from future space-born astrometry instruments with the coordinate system constructed from analysis of the global very long baseline interferometry (VLBI) more robust. Investigation of their rotation, zonal errors, and the non-alignment of the radio and optical positions caused by both radio and optical structures are important for validation of both techniques. In order to support these studies, the densification of the list of compact extragalactic objects that are bright in both radio and optical ranges is desirable. A set of 105 objects from the list of 398 compact extragalactic radio sources with declination > -10…
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