Author: IERS Rapid Service/Prediction Center Subject: Earth Orientation Contributions to IERS Bulletin A Date: 1 Jun 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. 60091.33 9 0.009 0.008 GSFC Int. 60095.79 43 0.002 0.012 USNO Int. 60095.79 22 -0.005 0.011 IAA VLBI 60010.21 5 -0.43 0.34 -0.001 0.38 0.29 0.027 GSFC VLBI 60080.21 8 -0.01 0.03 -0.001 0.06 0.09 0.002 USNO VLBI 60083.27 8 -0.02 -0.04 -0.001 0.05 0.16 0.002 IVS VLBI 60062.28 9 0.06 0.27 0.001 0.13 0.25 0.005 ILRS SLR 60094.50 30 -0.07 0.10 0.16 0.24 IAA SLR 59952.19 31 0.00 -0.15 0.24 0.25 MCC SLR 59939.00 28 0.15 0.05 0.16 0.15 IGS Final 60077.50 30 0.00 0.00 0.01 0.00 IGS Rapid 60095.50 18 0.00 0.00 0.03 0.01 --- --- --- --- IGS Ultra 60096.00 2 0.02 0.01 0.01 0.01 60096.00 1 0.001 --- USNO GPS 60096.25 32 0.002* 0.043* NCEP AAM 60103.50 15 -0.001 0.002 * 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 59909.5 30 0.00 0.00 0.002* 0.001* 0.01 0.00 0.023* 0.016* IGS Rapid 59926.5 30 -0.01 0.00 -0.002* 0.000* 0.04 0.04 0.051* 0.019* IGS Ultra 59927.25 120 0.01 -0.01 -0.004* 0.001* 0.05 0.04 0.062* 0.022* Bulletin B 60035.0 30 0.00 0.00 0.007 0.02 0.02 0.012 14C04 60066.0 30 0.01 0.03 -0.009 0.04 0.03 0.033 Plots of the residuals are available at http://www.usno.navy.mil/USNO/ earth-orientation/eo-products/weekly. ------------------------------------------------------------------------------ The IERS Rapid Service/Prediction Center is an activity of the Earth Orientation Department at the U.S. Naval Observatory.