NASA Goddard Space Flight Center   Geodesy and Geophysics Laboratory  

VLBI global solution rfc_2024a

Astrometric global solution rfc_2024a used all available VLBI observations at 8.6GHz and 2.2 GHz, as well at 5 and 22GHz from 1980.04.11 through 2023.03.11, in total 19,228 observing sessions, including 1086 observing sessions of 65 dedicated absolute astrometry programs.

In total, 24,982,131 estimates of group delays were used in LSQ solutions.

Positions of 21,907 sources were adjusted in a single solution that includes X/C and X/S dual-band as well single band group delays X-band, S-band, C-band, and K-bands. is the most complete catalogue of positions of compact radio sources. Technical description of the solution is available here.

The contents of this web page and following links contain unpublished material. The material is provided as a courtesy for preview. Using this material in publications, copying, and posting on Internet is not allowed without written prior permission.

Astrometric Results

  1. rfc_2024a catalogue in HTML form (64 Mb). NB: loading the catalogue takes time, please be patient. The catalogue contains source positions, their uncertainties, estimates of the total VLBA flux density, the VLBA flux density of unresolved components, naturally weighted CLEAN images in postscript and in fits format at X and S-band; plots of the correlated flux density as a function of the length of the baseline projection to the source plane; fits files with calibrated uv data. Images and estimates of correlated flux densities are available for 17,410 sources from this catalogue.
  2. rfc_2024a catalogue in ASCII format. (4 Mb) The catalogue contains source positions, their uncertainties, total VLBA flux density, the VLBA flux density of unresolved components. Source positions are derivied from a fuxed observables.
  3. multi-band extension of the rfc_2024a catalogue. (7 Mb) The catalogue contains offsets of source positions derived from single-band and dual-band observations with respect to rfc positions as well and their uncertainties.
  4. rfc_2024a catalogue in key-format format. The catalogue contains source positions. This catalogue can be used as a priori file for VLBI SCHED scheduling software package.
  5. Interactive VLBI calibrator search tool among sources in the rfc_2024a catalogue.

Observing campaigns statistcs

  1. Brief campaign description
  2. Statistics of the number of sources observed and detected per campaign.
  3. List of sources that were observed only in a given campaign
  4. List of campaigns a given source was observed
  5. Statistics of detections per campaign

Astrophysics Information

  1. 122,741 Images and calibrated uv data for 20262 compact sources at S, C, X, U, K, Q, and W bands in one compressed tar.bz2 file is available (157 Gb). For many sources images for more than one epoch are available.
  2. Single dish spectrum for 17,352 sources from published results determined with the use of the CATS database. NB: the estimates of flux density are NOT simultaneous. Since the majority of sources are variable, these estimates of the spectrum are not always reliable. Estimates of spectrum for some sources may be wrong due to errors in the database of singe dish flux measurements.

Geophysics Results

Station positions and velocities

Positions of 232 stations and their velocities were estimated as global parameters. Station positions are given on epoch 2000.01.01. Boundary conditions were selected in such a way that source positions, station positions and velocities are compatible with USNO series of the Earth orientation parameters finals.all and finals.daily.

Station positions catalogue Format description
Station velocity catalogue Format description
Empirical model of aharmonic non-linear site motion Format description
Empirical model of harmonic site motion Format description

Antenna axis offsets

Antenna axis offsets from LSQ estimation     rfc_2024a.axof

Earth orientation parameters

Pole coordinates X, Y, UT1 angle, and their rate, daily correction to the nutation in longitude and nutation in obliquity were estimated for each session separately.

EOP time series in ERM format Format description
EOP harminic consituents in HEO format Format description

Earth orientation parameters

This table contains the series of the series of the Earth Orientation Parameters.


Wrms for each session of fused data Format description
Wrms for each session at X/S and X/C Format description
Wrms for each session at S-band only Format description
Wrms for each session at C-band only Format description
Wrms for each session at X-band only Format description
Wrms for each session at K-band only Format description
List of detected sources in geodetic X/S sessions  
List of detected sources using fused data  
List of detected sources at sessions in X/C and X/S bands  
List of detected sources at S-band at each session  
List of detected sources at C-band at each session  
List of detected sources at X-band at each session  
List of detected sources at K-band at each session  
Summary of detected sources using fused data  
Summary of detected sources at X/S and X/C astrometric sessions  
Summary of observed sources at S-band  
Summary of observed sources at C-band  
Summary of observed sources at X-band  
Summary of observed sources at K-band  


Control file for batch Solve solution. Description of Solve batch control language.

Usage policy: you can download files for research purposes, you can put links to this Web page, but you cannot post any part of content of this Web page on ftp or http servers without prior written permission from authors.


The use of Very Long Baseline Array (VLBA) data is acknowledged. VLBA is operated by the National Radio Astronomy Observatory, which is a facility of the National Science Foundation, and operated under cooperative agreement by Associated Universities, Inc. The use of the VLBA under the US Naval Observatory's time allocation is acknowledged. This work supports USNO's ongoing research into the celestial reference frame and geodesy. These data were retrieved from the VLBA public archive.

The use of Long Baseline Array (LBA) data is acknowledged. The LBA is a part of the Australia Telescope National Facility which is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO.

The use of European VLBI Network (EVN) data is acknowledged. The European VLBI Network is a joint facility of independent European, African, Asian, and North American radio astronomy institutes.

The use of Korean and VLBI Exploration for Astrometry VLBI Networks (KVN and KaVa) data The KVN and VERA are operated by the the Korea Astronomy and Space Science Institute and the National Astronomical Observatory of Japan.

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Last update: 2024.06.05_16:02:19 UTC