Author: IERS Rapid Service/Prediction Center Subject: Earth Orientation Contributions to IERS Bulletin A Date: 11 Aug 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. 59798.33 10 0.013 0.005 GSFC Int. 59801.79 25 0.009 0.010 USNO Int. 59801.79 24 -0.007 0.008 IAA VLBI 59782.27 9 0.18 0.39 -0.003 0.15 0.21 0.010 GSFC VLBI 59789.27 9 -0.09 0.10 0.003 0.07 0.04 0.004 USNO VLBI 59789.27 8 -0.05 0.09 -0.004 0.10 0.03 0.003 IVS VLBI 59782.29 9 -0.03 0.26 0.004 0.10 0.12 0.003 ILRS SLR 59800.50 30 -0.12 0.21 0.12 0.12 IAA SLR 59800.54 31 -0.23 0.08 0.19 0.22 MCC SLR 59777.00 24 0.02 0.28 0.14 0.20 IGS Final 59783.50 30 0.00 0.00 0.01 0.01 IGS Rapid 59801.50 18 0.00 0.00 0.03 0.02 --- --- --- --- IGS Ultra 59802.00 2 0.00 0.00 0.05 0.02 59802.00 1 -0.007 --- USNO GPS 59800.25 32 0.001* 0.072* NCEP AAM 59809.50 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 59783.5 30 0.00 0.00 0.005*-0.002* 0.01 0.01 0.020* 0.018* IGS Rapid 59800.5 30 0.00 0.00 -0.001*-0.003* 0.03 0.03 0.052* 0.017* IGS Ultra 59801.25 120 0.00 0.01 -0.001*-0.005* 0.05 0.04 0.069* 0.032* Bulletin B 59761.0 30 -0.01 0.02 -0.010 0.03 0.03 0.018 14C04 59772.0 30 0.00 0.02 -0.009 0.04 0.02 0.014 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.