Author: IERS Rapid Service/Prediction Center
Subject: Earth Orientation Contributions to IERS Bulletin A
Date: 30 Nov 23


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.     60260.33    10              -0.003               0.007

GSFC Int.    60277.75    44               0.000               0.010

USNO Int.    60276.75    28               0.003               0.009

IAA VLBI     60214.21     8  -0.11 -0.21  0.009   0.43  0.82  0.030

GSFC VLBI    60258.27    10   0.03 -0.05  0.002   0.07  0.06  0.004

USNO VLBI    60258.27     9  -0.06 -0.02 -0.001   0.06  0.03  0.006

IVS  VLBI    60255.22     9   0.10  0.14  0.000   0.11  0.09  0.005

ILRS SLR     60276.50    27   0.27 -0.39          0.18  0.20

IAA SLR      59952.19    31   0.03 -0.05          0.25  0.25

MCC SLR      59939.00    28   0.10 -0.01          0.17  0.15

IGS Final    60259.50    30   0.00  0.00          0.00  0.00

IGS Rapid    60277.50    18   0.00  0.00          0.01  0.00

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

IGS Ultra    60278.00     2   0.00  0.00          0.00  0.01

             60278.00     2               0.001*              0.001*

USNO GPS     60272.25    31              -0.034*              0.084*

NCEP AAM     60285.50    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    60259.5  30   0.00  0.00 -0.001* 0.001*  0.00  0.00  0.023* 0.015*

IGS Rapid    60276.5  30  -0.01  0.00  0.005* 0.000*  0.03  0.03  0.046* 0.021*

IGS Ultra    60277.25 120  0.00  0.02  0.006*-0.002*  0.04  0.03  0.046* 0.031*

Bulletin B   60218.0  30   0.00  0.01  0.027          0.04  0.07  0.041

C04          60248.0  30   0.00  0.01  0.011          0.03  0.03  0.027


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.