Goddard VLBI global solution 2016a

Goddard global solution 2016a used all available dual band VLBI observations (except the VLBA Calibrator Surveys) at 8.4 GHz and 2.2 GHz from 1979.08.03 to 2016.08.22, 5938 diurnal sessions, 10,807,922 measurements of group delays.
A single combined least square solution was done. The technical description provides additional details.

Source positions

Positions of 1895 sources were estimated as global parameters. A source was required to have at least 3 good observations in at least one session. Three gravitational lenses, 0218+357/0218+35A/0218+35B, 1830-21A/1830-21B/1830-211, and 1422+231 were excluded. The global source positions are presented in catalog 2016a.sou. The positions of 39 sources were estimated as arc parameters (a position for each session). These are the ICRF2 'special handling' sources that showed the most instability. The mean values of their positions are presented in catalog 2016a_lso.sou.

Source catalogue 2016a.sou Format description
Source catalogue 2016a_lso.sou Format description
Source positions time series Format description
Statistics of observed sources

Station positions and velocities

Positions of 170 stations and velocities of 141 were estimated as global parameters. Station positions are given at epoch 2014.01.01. If a date is appended to a station name (such as MOJAVE12_920627), that indicates episodic motion and when the new position should start being used; but the epoch is still 2014.01.01. Note: Current positions for TSUKUB32, KASHIM34, KASHIM11, TIGOCONC, VERAMZSW, SINTOTU3, USUAD64, and KOGANEI should not be taken from this catalog due to earthquake effects. Please consult with D. Gordon or D. MacMillan.

Station positions catalogue Format description
Station velocity catalogue Format description
Catalogue of station positions and velocities in Sinex format Format description Format amendment
Catalogue of antenna axis offsets Format description

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
EOP-XY time series in IVS format Format description
Correlations between EOP estimates Format description

Statistics

wrms for each session Format description

Comparison of EOP series

Comparison with IERS C04 series shows random noise with slight linear trend with scatter comparable with the accuracy of VLBI EOP series.
  1. Plot of the differences with IERS C04 in X pole coordinates;

  2. Plot of the differences with IERS C04 in Y pole coordinates;

  3. Plot of the differences with IERS C04 in UT1 angles;

  4. Plot of the differences with IERS C04 in nutation in longitude;

  5. Plot of the differences with IERS C04 in nutation in obliquity;

  6. Table of statistics of the differences.

Miscellaneous

Control file for the batch Solve solution. Description of Solve batch control language.
VLBI experiments list for the batch Solve solution. Description of Solve batch control language.
Latest Time Series of source positions.
Latest GSFC astro source catalog of 4196 sources.

Back to Goddard VLBI solution page.
Web page was prepared by David Gordon
David.Gordon-1@nasa.gov
Last update 2016.09.20