DE WITT, Aletha; BASU, Sayan; CHARLOT, Patrick; GORDON, David; JACOBS, Christopher; JOHNSON, Megan; KRÁSNÁ, H; LE BAIL, K; SHU, Fengchun; TITOV, O; SCHARTNER, M

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DE WITT, Aletha
South African Radio Astronomy Observatory [SARAO]

BASU, Sayan

CHARLOT, Patrick
Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]

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Communication dans un congrès

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25th Working Meeting of the European VLBI Group for Geodesy and Astrometry (EVGA), 2021-03-15, Cyberspace.

Resumen en inglés

Catalogs of positions of compact extragalactic radio sources, including the ICRF-3, are generally weaker in the south by factors of 2 or more in both density and precision. In 2018 we started a campaign to improve the S/X celestial reference frame in the South by upgrading existing IVS astrometric observing programmes. Our efforts were mainly focused on the Celestial Reference Frame (CRF) and Celestial Reference Frame Deep South (CRDS) sessions, which are dedicated astrometric observing programmes of sources at mid-and southern declinations. In particular, the data rate of the CRF and CRDS< Leer menos

Palabras clave en inglés

Astrometry

VLBI

Celestial Reference Frame

Southern Hemisphere

quasars

Orígen

Importado de Hal

Centros de investigación

Laboratoire d'Astrophysique de Bordeaux (LAB) - UMR 5804