In total, 19,711,573 estimates of group delays were used in LSQ solutions.
Positions of 18,456 sources were adjusted in 5 least square solutions for X/S and X/C, X-band, S-band, C-band, and K-band solutions. This is the most complete catalogue of positions of compact radio sources. Technical description of the solution is available here.
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Astrometric Results
- rfc_2020d catalogue in HTML form (56 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 15,229 sources from this catalogue.
- rfc_2020d catalogue in ASCII format. (3 Mb) The catalogue contains source positions, their uncertainties, total VLBA flux density, the VLBA flux density of unresolved components.
- rfc_2020d 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.
- rfc_2020d catalogue in blokq format. The catalogue contains source positions and their uncertainties. This catalogue can be used as a priori file for library VTD and VLBI analysis software package Post-Solve.
- Interactive VLBI calibrator search tool among sources in the rfc_2020d catalogue.
Astrophysics Information
- 127,948 Images and calibrated uv data for 20472 compact sources at S, C, X, U, K, Q, and W bands in one compressed tar.bz2 file is available (141 Gb). For many sources images for more than one epoch are available.
- Single dish spectrum for 15,413 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 201 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.
Antenna axis offsets
Antenna axis offsets from LSQ estimation rfc_2020d.axofEarth 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.
Statistics
Miscellaneous
| Control file for batch Solve solution. | |
Description of Solve batch control language. |
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Acknowledgments
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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Web page was prepared by Leonid Petrov (
) Last update: 2021.04.16_21:35:10