Author: IERS Rapid Service/Prediction Center
Subject: Earth Orientation Contributions to IERS Bulletin A
Date: 13 Oct 16


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.     57670.33    10              -0.001               0.009

GSFC Int.    57673.79    30               0.001               0.011

USNO Int.    57673.79    32               0.000               0.011

IAA VLBI     57658.21     5   0.13 -0.14  0.003   0.11  0.17  0.009

GSFC VLBI    57658.21     6   0.10 -0.01 -0.005   0.06  0.06  0.006

USNO VLBI    57658.21     5   0.15 -0.04  0.007   0.10  0.05  0.005

IVS  VLBI    57658.21     5   0.04 -0.30 -0.001   0.10  0.12  0.004

ILRS SLR     57672.50    30  -0.17  0.20          0.09  0.16

IAA SLR      57672.47    30  -0.04  0.05          0.14  0.18

MCC SLR      57669.00    27   0.05  0.26          0.15  0.08

IGS Final    57662.50    30   0.00  0.00          0.02  0.01

IGS Rapid    57673.50    11   0.00  0.00          0.03  0.03

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

IGS Ultra    57674.00     2  -0.01  0.01          0.01  0.04

             57674.00     1              -0.009                 ---

USNO GPS     57674.25    32               0.000*              0.023*

NCEP AAM     57681.50    15               0.000               0.000

* 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    57662.5  30  -0.01  0.02 -0.003*-0.003*  0.03  0.02  0.011* 0.017*

IGS Rapid    57672.5  30   0.01  0.00 -0.011* 0.002*  0.04  0.04  0.048* 0.018*

IGS Ultra    57319.25 120 -0.01  0.02 -0.011* 0.002*  0.07  0.04  0.044* 0.018*

Bulletin B   57632.0  30   0.01  0.01 -0.003          0.03  0.04  0.024

08C04        57644.0  30   0.01  0.02  0.003          0.04  0.04  0.030


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.