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On the VLBI measurement of the Solar system acceleration

Created 17/10/2025

Updated 17/10/2025

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Aims. We proposed new estimates of the secular aberration drift, mainly due to the rotation of the Solar system about the Galactic center, based on up-to-date VLBI observations and improved methods of outlier elimination. Methods. We fitted degree-2 vector spherical harmonics to extragalactic radio source proper motion field derived from geodetic VLBI observations spanning 1979-2013. We paid a particular attention the outlier elimination procedure to remove outliers from (i) radio source coordinate time series and (ii) the proper motion sample. Results. We obtained more accurate values of the Solar system acceleration than in our previous paper. The acceleration vector is oriented towads the Galactic center within ~7. The component perpendicular to the Galactic plane is statistically unsignificant. We showed than an unsufficient cleaning of the data set can lead to strong variations in the dipole amplitude and orientation, and thus to erroneous physical interpretations of the results. The quadrupole harmonics remain unsignificant. Nevertheless, it imposes a limit to the gravitational waves density integrated over a range of frequencies less than 10-9 Hz of GW = 0.0007 h-2, where h = H0/(100 km/s/Mpc) is the normalized Hubble constant.

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Field Value
Title On the VLBI measurement of the Solar system acceleration
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/87aaa3d1-41d9-47ca-b4fc-e4c38d901c41
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage Australia
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "On the VLBI measurement of the Solar system acceleration". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/on-the-vlbi-measurement-of-the-solar-system-acceleration