Sou323 ICRF reference sample : J/MNRAS/466/1567

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Authors : Liu N. orcid , Liu J.-C., Zhu Z. (hide) , Liu J.-C., Zhu Z. et..al

VizieR DOI : 10.26093/cds/vizier.74661567
Bibcode : 2017MNRAS.466.1567L (ADS) (Simbad) (Objects)
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CDS Keywords : Fundamental catalog; Positional data; VLBI
UAT : Optical observation, Catalogs, Astrometry, Very long baseline interferometry

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Inserted into VizieR : 27-Nov-2019
Last modification : 17-Aug-2024

Test of source selection for constructing a more stable and uniform celestial reference frame. (2017)

Keywords : catalogues - astrometry - reference systems

Abstract:We aim to evaluate the possibility of improving the International Celestial Reference System realization starting from the ICRF2 catalogue by investigating the coordinate time series of radio sources observed by the very long baseline interferometry between 1979 and 2016. Sources with long observational history are selected as the candidates and the least-squares fits with special handling of the weights are performed to derive the linear drifts of the source coordinates. Then the sources are sorted, based on the normalized linear drift (i) over the whole sky, and (ii) in four homolographic areas divided by declinations. The axial stability of the reference system and sky distribution defined by the selected sources are ...(more)
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With the coordinate time series over 30yr, some of ICRF2 defining appear to be unstable and not suitable for defining a celestial frame. We have applied an improved selection scheme to pick out suitable sources as candidates. Finally, two sets of sources that show improved axial stability and sky distribution are recommended (Sou323 and Sou294). Only Sou323 is available. 


                


                

                    

                


                

                    

                


                

                    
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