Solution 2009b_astro was replaced with rfc_2010c We recommend to use rfc_2010c solution.

 

If you really, really, really nead the obsolete solution 2009b_astro, scroll to the bottom of this page.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VLBI global solution 2009b_astro

Astrometric global solution 2009b_astro used all available VLBI observations at 8.6GHz and 2.2 GHz as well at 22GHz from 1980.04.11 through 2009.05.06, 4753 twenty four hour sessions, including 27 observing sessions of the VLBA Calibrator Survey, and 3 observing sessions of the LBA Calibrator Survey, in total 7.06 million estimates of group delays.

Positions of 4337 sources were adjusted in a single least square solution. Currently, this is the most complete catalogue of positions of compact radio sources. Technical description of the solution is available here.

Astrometric Results

  1. 2009b_astro catalogue in HTML form (10 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 3622 sources from this catalogue. Among 4337 sources, 3622 are classified as calibrators, 396 are classified as non-calibrators with reliable positions and 232 are classified as non-calibrators with unreliable positions. For the sources from the latter class, there is a probability > 0.001 that group delay ambiguities were resolved incorrectly, and as a result their position may be off in a range of 0."1 to 5' from the reported coordinates.

  2. 2009b_astro catalogue in ASCII format. The catalogue contains source positions, their uncertainties, total VLBA flux density, the VLBA flux density of unresolved components.

  3. 2009b_astro 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.

  4. 2009b_astro catalogue in blokq format. The catalogue contains source positions and their uncertainties. This catalogue can be used as a priori file for Mark5 VLBI analysis software package Calc/Solve.

  5. Interactive calibrators search tool among sources in the 2009b_astro catalogue.

Astrophysics Information

  1. 26,486 Images and calibrated uv data for 4191 sources at S, C, X, U, K, Q, and W bands in one tar.bz2 file (23 Gb). For some of the sources images for more than one epoch are available. Refer to readme file for the file name convention in this archive. NB: the size of this file is greater than 2Gb. Your browser probably will not be able to download it. It is suggested to use wget-1.10 or newer for downloading this file.

  2. Single dish spectrum for 3917 sources from published results determined with 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 160 stations and their velocities were estimated as global parameters. Station positions are given on epoch 1997.01.01. 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     2009b_astro.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 Solve EOB format Format description
EOP time series in Solve NUT format Format description
EOP time series in IVS format Format description
Correlations between EOP estimates Format description

Statistics

Wrms for each session Format description
List of detected sources at X/S at each session  
List of detected sources at X-band or K-band at each session  
List of observed sources at S-band at each session  
Summary of detected sources at X/S  
Summary of observed sources at X-band or K-band  
Summary of observed sources at S-band  

Miscellaneous

Control file for batch Solve solution. Description of Solve batch control language.
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Web page was prepared by Leonid Petrov ()
Last update: 2010.09.13_20:48:57