Author: IERS Rapid Service/Prediction Center
Subject: Earth Orientation Contributions to IERS Bulletin A
Date:  1 Dec 22


In this report, individual Earth orientation time series are compared
to the IERS Bulletin A combination.  For further information, including
the raw time series, refer to http://www.usno.navy.mil/USNO/earth-orientation/
eo-info/general. 

The first table below shows some comparison results for those series
included in Bulletin A during the last 30 days.  All data are aligned to
the system defined the ITRF and the ICRF reference frames by removing
a priori mean bias and rate.

Units: milliseconds of arc for x, y; milliseconds of time for UT1-UTC

Contributor   Latest      #         Mean          Standard Deviation
Series         Day               (series-BullA)
                                x     y  UT1-UTC    x     y  UT1-UTC

GSI Int.     59910.33     7               0.015               0.029

GSFC Int.    59913.79    23               0.008               0.017

USNO Int.    59913.79    25              -0.014               0.020

IAA VLBI     59898.21     7   0.00  0.34 -0.009   0.11  0.11  0.008

GSFC VLBI    59898.21     9  -0.18  0.07  0.003   0.14  0.12  0.004

USNO VLBI    59898.21     9  -0.01 -0.09  0.002   0.05  0.06  0.003

IVS  VLBI    59898.21     7  -0.12  0.09 -0.001   0.10  0.09  0.002

ILRS SLR     59912.50    30  -0.27  0.25          0.20  0.18

IAA SLR      59893.22     8  -0.33  0.11          0.20  0.15

MCC SLR      59896.00    29   0.03  0.01          0.17  0.13

IGS Final    59902.50    30   0.00  0.00          0.01  0.00

IGS Rapid    59913.50    11   0.00  0.00          0.03  0.00

             ---        ---               ---                 ---

IGS Ultra    59914.00     2   0.00  0.00          0.03  0.01

             59914.00     1              -0.007                 ---

USNO GPS     59914.00    30              -0.004*              0.074*

NCEP AAM     59921.50    15               0.000               0.001

* All satellite techniques provide information on the rate of change of
  Universal Time contaminated by effects due to unmodelled orbit node
  motion.  VLBI-based results have been used to minimize drifts in UT
  estimates.


The following table shows comparisons for other related time series during
the last 30 days.  No systematic corrections have been applied.

Units: milliseconds of arc for x, y; milliseconds of time for UT, LOD 

              Latest   #              Mean                Standard Deviation
Series         Day               (series-BullA)
                             x     y     UT     LOD     x     y      UT    LOD 

IGS Final    59902.5  30   0.00  0.00 -0.001* 0.002*  0.01  0.00  0.024* 0.018*

IGS Rapid    59912.5  30  -0.01  0.00  0.001* 0.001*  0.03  0.02  0.050* 0.017*

IGS Ultra    59913.25 120  0.00 -0.01  0.010* 0.001*  0.05  0.03  0.055* 0.026*

Bulletin B   59853.0  30  -0.01  0.00 -0.006          0.04  0.04  0.031

14C04        59884.0  30   0.00  0.00  0.000          0.06  0.03  0.021


Plots of the residuals are available at http://www.usno.navy.mil/USNO/
earth-orientation/eo-products/weekly.
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The IERS Rapid Service/Prediction Center is an activity of the Earth
Orientation Department at the U.S. Naval Observatory.