On More than Two Decades of Celestial Reference Frame VLBI Observations in the Deep South: IVS-CRDS (1995 - 2021)
Artikel i vetenskaplig tidskrift, 2023

The International VLBI Service for Geodesy & Astrometry (IVS) regularly provides high-quality data to produce Earth Orientation Parameters (EOP), and for the maintenance and realization of the International Terrestrial and Celestial Reference Frames, ITRF and ICRF. The first iteration of the celestial reference frame (CRF) at radio wavelengths, the ICRF1, was adopted by the International Astronomical Union (IAU) in 1997 to replace the FK5 optical frame. Soon after, the IVS began official operations and in 2009 there was a significant increase in data sufficient to warrant a second iteration of the CRF, ICRF2. The most recent ICRF3, was adopted by the IAU in 2018. However, due to the geographic distribution of observing stations being concentrated in the Northern hemisphere, CRFs are generally weaker in the South due to there being fewer Southern Hemisphere observations. To increase the Southern Hemisphere observations, and the density, precision of the sources, a series of deep South observing sessions was initiated in 1995. This initiative in 2004 became the IVS Celestial Reference Frame Deep South (IVS-CRDS) observing program. This paper covers the evolution of the CRDS observing program for the period 1995 to 2021, details the data products and results, and concludes with a summary of upcoming improvements to this ongoing project.

IVS

Keywords:

Geodesy

VLBI

Författare

S. Weston

Auckland University of Technology

A. De Witt

South African Radio Astronomy Observatory (SARAO)

Hana Krásná

Technische Universität Wien

Karine le Bail

Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium

NASA Goddard Space Flight Center

Sara Hardin

US Naval Observatory

David Gordon

US Naval Observatory

Shu Fengchun

Shanghai Astronomical Observatory

Alan Lee Fey

US Naval Observatory

Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium

Matthias Schartner

Eidgenössische Technische Hochschule Zürich (ETH)

Sayan Basu

South African Radio Astronomy Observatory (SARAO)

O. Titov

Geoscience Australia

Dirk Behrend

NASA Goddard Space Flight Center

Christopher S. Jacobs

California Institute of Technology (Caltech)

Warren Hankey

University of Tasmania

Federico Salguero

Consejo Nacional de Investigaciones Cientificas y Tecnicas

J.E. Reynolds

Commonwealth Scientific and Industrial Research Organisation (CSIRO)

Publications Astronomical Society of Australia

1323-3580 (ISSN) 1448-6083 (eISSN)

Vol. 40 e041

Ämneskategorier

Astronomi, astrofysik och kosmologi

DOI

10.1017/pasa.2023.33

Mer information

Senast uppdaterat

2024-03-07