VLBI global solution 2008a_astro
Astrometric global solution 2008a_astro used all available VLBI observations
at 8.6GHz and 2.2 GHz as well at 22GHz from 1980.04.11 through 2008.02.01,
4514 twenty four hour sessions, including 27 observing sessions of the
VLBA Calibrator Survey, in total
6.3 million measurements of group delays.
Positions of 3922 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
-
2008a_astro catalogue in
HTML form (9 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 3613 sources from this
catalogue. Among 3922 sources, 3024 are classified as calibrators,
673 are classified as calibrators with reliable positions and
225 are classified as non-calibrators with unreliable positions.
-
2008a_astro catalogue in ASCII format.
The catalogue contains source positions, their uncertainties,
total VLBA flux density, the VLBA flux density of unresolved
components.
-
2008a_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.
-
2008a_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.
-
23774 Images and calibrated uv data
for 4169 sources at
S, C, X, U, K and Q 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.
- Interactive
calibrators search tool among sources in the 2008a_astro
catalogue.
Geophysics Results
Station positions and velocities
Positions of 159 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.
Antenna axis offets
Antenna axis offsets from LSQ estimation
2008a_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.
Statistics
Miscellaneous
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.
Back to
Goddard VLBI astrometric catalogues .
Web page was prepared by Leonid Petrov
(
)
Last update: 2008.03.01_14:57:34