From Geoscience Australia
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The Secular Aberration Drift and Future Challenges for VLBI Astrometry

Created 17/10/2025

Updated 17/10/2025

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The centrifugial acceleration of the Solar system, resulting from the gravitational attraction of the Galaxy centre, causes a phenomenon known as 'secular aberration drift'. This acceleration of the Solar system barycentre has been ignored so far in the standard procedures for high-precision astrometry. It turns out that the current definition of the celestial reference frame as epochless and based on the assumption that quasars have no detectable proper motions, needs to be revised. In the future, a realization of the celestial reference system (realized either with VLBI, or GAIA) should correct source coordinates from this effect, possibly by providing source positions together with their proper motions. Alternatively, the galactocentric acceleration may be incorporated into the conventional group delay model applied for VLBI data analysis. Presented at the Journees 2011 19-21 September, Vienna, Austria.

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Additional Info

Field Value
Title The Secular Aberration Drift and Future Challenges for VLBI Astrometry
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/ecc7917f-110b-4434-8fed-80653a13917d
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        112.92,
        -54.75
      ],
      [
        159.11,
        -54.75
      ],
      [
        159.11,
        -9.2402
      ],
      [
        112.92,
        -9.2402
      ],
      [
        112.92,
        -54.75
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "The Secular Aberration Drift and Future Challenges for VLBI Astrometry". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/the-secular-aberration-drift-and-future-challenges-for-vlbi-astrometry