BULLETIN B 450 1 August 2025 Contents are described in https://hpiers.obspm.fr/iers/bul/bulb_new/bulletinb.pdf 1 - DAILY FINAL VALUES OF x, y, UT1-UTC, dX, dY Angular unit is milliarcsecond (mas), time unit is millisecond (ms). Upgraded solution from March 1 2017 - consistent with ITRF 2014. DATE MJD x y UT1-UTC dX dY x err y err UT1 err dX err dY err (0 h UTC) mas mas ms mas mas mas mas ms mas mas Final values Mean formal error 0.031 0.027 0.0201 0.013 0.007 2025 6 2 60828 114.139 437.996 29.0266 0.305 -0.225 0.032 0.030 0.0221 0.012 0.007 2025 6 3 60829 115.438 438.395 28.9611 0.282 -0.262 0.032 0.030 0.0214 0.012 0.007 2025 6 4 60830 117.210 438.991 28.8460 0.285 -0.282 0.031 0.029 0.0199 0.012 0.007 2025 6 5 60831 118.716 439.873 28.7438 0.351 -0.266 0.031 0.028 0.0188 0.012 0.007 2025 6 6 60832 120.187 440.262 28.6828 0.426 -0.237 0.032 0.027 0.0182 0.012 0.007 2025 6 7 60833 121.696 440.761 28.7050 0.448 -0.205 0.032 0.027 0.0182 0.012 0.007 2025 6 8 60834 123.157 441.037 28.9106 0.426 -0.177 0.032 0.027 0.0191 0.013 0.008 2025 6 9 60835 124.775 441.504 29.3605 0.387 -0.158 0.032 0.027 0.0192 0.014 0.008 2025 6 10 60836 126.194 441.986 30.0358 0.345 -0.153 0.031 0.027 0.0191 0.015 0.008 2025 6 11 60837 127.604 442.518 30.8604 0.337 -0.192 0.032 0.028 0.0190 0.016 0.009 2025 6 12 60838 129.061 442.813 31.7785 0.347 -0.248 0.032 0.028 0.0189 0.017 0.009 2025 6 13 60839 130.742 442.826 32.7324 0.366 -0.304 0.032 0.029 0.0190 0.019 0.009 2025 6 14 60840 132.545 442.639 33.6031 0.405 -0.335 0.032 0.029 0.0194 0.019 0.009 2025 6 15 60841 134.715 442.401 34.2998 0.454 -0.346 0.032 0.028 0.0199 0.018 0.009 2025 6 16 60842 136.991 442.552 34.7940 0.499 -0.346 0.031 0.028 0.0202 0.016 0.009 2025 6 17 60843 138.885 442.694 35.0650 0.531 -0.336 0.031 0.028 0.0203 0.015 0.009 2025 6 18 60844 140.596 442.858 35.1231 0.518 -0.315 0.031 0.028 0.0207 0.015 0.009 2025 6 19 60845 142.035 443.081 35.0401 0.486 -0.289 0.031 0.029 0.0212 0.014 0.008 2025 6 20 60846 143.562 442.673 34.9179 0.448 -0.265 0.031 0.029 0.0213 0.013 0.008 2025 6 21 60847 145.216 442.560 34.8913 0.423 -0.253 0.032 0.028 0.0214 0.013 0.008 2025 6 22 60848 146.810 442.291 35.1524 0.406 -0.251 0.033 0.027 0.0215 0.012 0.008 2025 6 23 60849 148.555 441.987 35.8309 0.395 -0.255 0.033 0.027 0.0213 0.012 0.007 2025 6 24 60850 150.189 441.609 36.8179 0.388 -0.265 0.032 0.027 0.0212 0.011 0.007 2025 6 25 60851 151.803 441.103 37.9660 0.389 -0.291 0.031 0.027 0.0220 0.011 0.007 2025 6 26 60852 153.281 440.680 39.1851 0.392 -0.316 0.032 0.027 0.0226 0.011 0.007 2025 6 27 60853 154.755 440.357 40.3668 0.394 -0.327 0.032 0.027 0.0193 0.012 0.007 2025 6 28 60854 156.421 440.099 41.3854 0.383 -0.276 0.033 0.027 0.0195 0.012 0.007 2025 6 29 60855 158.534 440.049 42.2187 0.365 -0.192 0.033 0.028 0.0194 0.012 0.008 2025 6 30 60856 160.282 440.054 42.8717 0.348 -0.104 0.032 0.028 0.0193 0.012 0.008 2025 7 1 60857 162.075 439.808 43.4235 0.339 -0.032 0.032 0.028 0.0188 0.012 0.008 Preliminary extension 2025 7 2 60858 163.726 439.709 43.8862 0.355 -0.031 0.032 0.027 0.0188 0.013 0.009 2025 7 3 60859 165.129 439.212 44.3592 0.381 -0.063 0.032 0.027 0.0191 0.015 0.011 2025 7 4 60860 166.750 439.040 44.9311 0.407 -0.106 0.032 0.027 0.0192 0.016 0.012 2025 7 5 60861 167.816 438.663 45.6696 0.416 -0.135 0.032 0.027 0.0195 0.020 0.017 2025 7 6 60862 169.262 437.901 46.6142 0.413 -0.155 0.030 0.025 0.0198 0.028 0.026 2025 7 7 60863 171.151 437.824 47.7666 0.403 -0.172 0.029 0.024 0.0198 0.036 0.036 2025 7 8 60864 173.377 438.072 49.0715 0.389 -0.188 0.029 0.023 0.0196 0.043 0.043 2025 7 9 60865 175.389 438.257 50.4322 0.371 -0.206 0.028 0.023 0.0198 0.071 0.075 2025 7 10 60866 176.474 437.971 51.7945 0.352 -0.222 0.028 0.023 0.0202 0.118 0.129 2025 7 11 60867 177.710 437.368 53.0831 0.332 -0.236 0.028 0.022 0.0208 0.162 0.178 2025 7 12 60868 178.642 437.060 54.1999 0.378 -0.280 0.029 0.022 0.0218 0.181 0.200 2025 7 13 60869 179.921 436.462 55.0442 0.459 -0.338 0.029 0.022 0.0231 0.208 0.230 2025 7 14 60870 181.808 436.214 55.5633 0.535 -0.386 0.029 0.022 0.0247 0.251 0.278 2025 7 15 60871 184.045 435.782 55.7924 0.585 -0.413 0.029 0.022 0.0260 0.294 0.327 2025 7 16 60872 186.745 435.529 55.9015 0.586 -0.406 0.029 0.023 0.0266 0.324 0.360 2025 7 17 60873 188.850 435.428 55.9693 0.519 -0.353 0.029 0.023 0.0253 0.338 0.376 2025 7 18 60874 190.660 435.055 56.0940 0.362 -0.243 0.030 0.023 0.0235 0.344 0.382 2025 7 19 60875 191.953 434.769 56.3619 0.334 -0.218 0.031 0.024 0.0222 0.500 0.500 2025 7 20 60876 192.903 433.989 56.8327 0.333 -0.215 0.033 0.025 0.0219 0.500 0.500 2025 7 21 60877 193.904 433.595 57.5065 0.335 -0.217 0.034 0.026 0.0225 0.500 0.500 2025 7 22 60878 194.927 433.236 58.3620 0.342 -0.222 0.036 0.027 0.0229 0.500 0.500 2025 7 23 60879 196.007 432.952 59.2633 0.352 -0.227 0.037 0.027 0.0235 0.500 0.500 2025 7 24 60880 197.148 432.617 60.0535 0.362 -0.229 0.038 0.028 0.0245 0.500 0.500 2025 7 25 60881 198.543 432.325 60.6536 0.369 -0.228 0.039 0.028 0.0246 0.500 0.500 2025 7 26 60882 199.642 431.695 61.0516 0.368 -0.223 0.041 0.029 0.0248 0.500 0.500 2025 7 27 60883 200.639 430.915 61.2818 0.360 -0.217 0.043 0.030 0.0255 0.500 0.500 2025 7 28 60884 202.014 430.273 61.3922 0.349 -0.210 0.046 0.032 0.0264 0.500 0.500 2025 7 29 60885 203.959 429.773 61.4475 0.340 -0.201 0.051 0.035 0.0274 0.500 0.500 2025 7 30 60886 206.131 429.028 61.5228 0.337 -0.187 0.060 0.040 0.0296 0.500 0.500 2025 7 31 60887 208.226 427.937 61.7239 0.341 -0.168 0.072 0.046 0.0334 0.500 0.500 2025 8 1 60888 210.238 427.165 62.1304 0.348 -0.149 0.091 0.056 0.0394 0.500 0.500 2 - DAILY FINAL VALUES OF CELESTIAL POLE OFFSETS dPsi1980 & dEps1980 dPsi1980 dEps1980 ....dPsi,dEps / IAU 1980 precession-nutation model Description : ftp://hpiers.obspm.fr/iers/bul/bulb_new/bulletinb.pdf The Reference Systems are described in the 2006 IERS Annual Report. DATE MJD dPsi1980 dEps1980 sig dPsi sig dEps (0 h UTC) mas mas mas mas 2025 6 2 60828 -111.033 -11.304 0.030 0.007 2025 6 3 60829 -111.720 -10.931 0.030 0.007 2025 6 4 60830 -112.107 -10.772 0.029 0.007 2025 6 5 60831 -111.992 -10.770 0.029 0.007 2025 6 6 60832 -111.728 -10.788 0.030 0.007 2025 6 7 60833 -111.686 -10.792 0.031 0.007 2025 6 8 60834 -111.872 -10.896 0.033 0.008 2025 6 9 60835 -112.162 -11.176 0.035 0.008 2025 6 10 60836 -112.481 -11.512 0.037 0.008 2025 6 11 60837 -112.688 -11.713 0.040 0.009 2025 6 12 60838 -112.757 -11.666 0.044 0.009 2025 6 13 60839 -112.695 -11.477 0.048 0.009 2025 6 14 60840 -112.561 -11.311 0.047 0.009 2025 6 15 60841 -112.462 -11.258 0.044 0.009 2025 6 16 60842 -112.403 -11.275 0.041 0.009 2025 6 17 60843 -112.334 -11.278 0.038 0.009 2025 6 18 60844 -112.364 -11.219 0.037 0.009 2025 6 19 60845 -112.563 -11.090 0.035 0.008 2025 6 20 60846 -113.001 -10.904 0.033 0.008 2025 6 21 60847 -113.594 -10.746 0.032 0.008 2025 6 22 60848 -114.172 -10.735 0.031 0.008 2025 6 23 60849 -114.553 -10.909 0.029 0.007 2025 6 24 60850 -114.686 -11.150 0.028 0.007 2025 6 25 60851 -114.649 -11.313 0.028 0.007 2025 6 26 60852 -114.510 -11.359 0.028 0.007 2025 6 27 60853 -114.258 -11.345 0.029 0.007 2025 6 28 60854 -114.027 -11.228 0.029 0.007 2025 6 29 60855 -114.083 -10.973 0.030 0.008 2025 6 30 60856 -114.589 -10.638 0.030 0.008 2025 7 1 60857 -115.343 -10.393 0.030 0.008 3 - EARTH ANGULAR VELOCITY : DAILY FINAL VALUES OF LOD, OMEGA AT 0hUTC LOD : Excess of the Length of day - 86400 s TAI OMEGA : Earth angular velocity Description: ftp://hpiers.obspm.fr/iers/bul/bulb_new/bulletinb.pdf DATE MJD LOD sigma OMEGA sigma (0 h UTC) ms ms mas/ms mas/ms 2025 6 2 60828 0.0281 0.0116 15.04106717378 0.00000000202 2025 6 3 60829 0.0980 0.0119 15.04106716161 0.00000000207 2025 6 4 60830 0.1171 0.0120 15.04106715828 0.00000000209 2025 6 5 60831 0.0868 0.0113 15.04106716356 0.00000000197 2025 6 6 60832 0.0272 0.0116 15.04106717394 0.00000000202 2025 6 7 60833 -0.0990 0.0112 15.04106719590 0.00000000195 2025 6 8 60834 -0.3197 0.0112 15.04106723433 0.00000000195 2025 6 9 60835 -0.5693 0.0117 15.04106727778 0.00000000204 2025 6 10 60836 -0.7667 0.0127 15.04106731214 0.00000000221 2025 6 11 60837 -0.8825 0.0121 15.04106733230 0.00000000211 2025 6 12 60838 -0.9467 0.0119 15.04106734348 0.00000000207 2025 6 13 60839 -0.9326 0.0118 15.04106734102 0.00000000205 2025 6 14 60840 -0.7971 0.0116 15.04106731743 0.00000000202 2025 6 15 60841 -0.5987 0.0121 15.04106728290 0.00000000211 2025 6 16 60842 -0.3825 0.0123 15.04106724526 0.00000000214 2025 6 17 60843 -0.1582 0.0124 15.04106720621 0.00000000216 2025 6 18 60844 0.0295 0.0119 15.04106717353 0.00000000207 2025 6 19 60845 0.1252 0.0125 15.04106715687 0.00000000218 2025 6 20 60846 0.0975 0.0128 15.04106716170 0.00000000223 2025 6 21 60847 -0.0902 0.0120 15.04106719437 0.00000000209 2025 6 22 60848 -0.4557 0.0126 15.04106725800 0.00000000219 2025 6 23 60849 -0.8592 0.0122 15.04106732825 0.00000000212 2025 6 24 60850 -1.0981 0.0120 15.04106736983 0.00000000209 2025 6 25 60851 -1.2002 0.0115 15.04106738761 0.00000000200 2025 6 26 60852 -1.2143 0.0120 15.04106739006 0.00000000209 2025 6 27 60853 -1.1150 0.0120 15.04106737278 0.00000000209 2025 6 28 60854 -0.9211 0.0115 15.04106733902 0.00000000200 2025 6 29 60855 -0.7258 0.0114 15.04106730502 0.00000000198 2025 6 30 60856 -0.5895 0.0114 15.04106728129 0.00000000198 2025 7 1 60857 -0.5074 0.0113 15.04106726700 0.00000000197 4 - INFORMATION ON TIME SCALES TAI - UTC = 37 s. during period [60828-60857] No leap second introduced during period [60828-60857] All information concerning time scales : - leap seconds announcements : Bulletin C - DUT1 announcements (UT1-UTC with 0.1 s accuracy) : Bulletin D can be found at : - web site : http://hpiers.obspm.fr/eop-pc/ - anonymous ftp://hpiers.obspm.fr/iers/ 5 - SUMMARY OF CONTRIBUTED EARTH ORIENTATION PARAMETERS SERIES This section gives the average precision of the individual series, some of them contributing to the combination (*) and their average agreement with it. The period covered is that one of Bulletin B. Units : micro-arc-seconds for x/y/dX/dY micro-seconds for UT1/LOD ----------------------------------------------------------------------------- EOP series first line : Mean formal uncertainty Periods covered second line : Weighted RMS agreement with Bulletin B ----------------------------------------------------------------------------- x y UT1 LOD dX dY Data Number VLBI Standards BKG bkg2025a.eoxy 46 51 3 - 35 35 9 60830.21 to 60853.27 91 56 11 - 66 44 GSFC gsf2023a.eoxy 56 55 3 10 40 39 9 60830.21 to 60853.27 264 108 14 24 35 37 IAA iaa2021a.eops 68 74 4 - 61 61 8 60830.21 to 60853.27 84 86 10 - 35 21 USNO usn2025a.eoxy 50 49 3 - 49 48 8 60830.21 to 60853.27 106 60 12 - 45 35 OPA opa2024a.eops 108 113 14 - 53 162 5 60830.21 to 60843.21 223 128 26 - 73 137 IVS * ivs2023a.eoxy 53 73 4 - 38 37 8 60830.22 to 60853.28 87 82 14 - 6 6 ASI asi2023a.eoxy 88 106 12 - 125 142 8 60830.21 to 60853.27 256 129 23 - 170 236 VIE vie2023a.eopxy 164 177 9 - - - 18 60830.00 to 60857.00 319 314 16 - - - VIE vie2023a.eoxy - - - - 46 44 9 60830.21 to 60853.27 - - - - 75 81 VLBI Intensive GSI * gsiint2d.eopi - - 15 - - - 8 60833.33 to 60855.33 - - 44 - - - BKG * bkg2025a.eopi - - 8 - - - 77 60828.25 to 60856.75 - - 24 - - - GSFC * gsf2023a.eopi - - 10 - - - 85 60828.25 to 60856.75 - - 28 - - - IAA * iaa2021a.eopi - - 8 - - - 80 60828.29 to 60856.75 - - 33 - - - USNO * usn2025a.eopi - - 13 - - - 77 60828.75 to 60856.75 - - 26 - - - VIE vie2023a.eopi - - 8 - - - 73 60828.25 to 60856.75 - - 41 - - - DGFI dgf2024a.eopi - - 10 - - - 29 60828.75 to 60856.75 - - 45 - - - GPS CODE COD0OPSFIN 3 3 - 0 - - 29 60828.50 to 60856.50 21 19 - 11 - - JPL JPL0OPSFIN 4 4 - 2 - - 29 60828.50 to 60856.50 27 25 - 17 - - GFZ GFZ0OPSFIN 6 6 - 1 - - 29 60828.50 to 60856.50 19 31 - 14 - - ESA ESA0OPSFIN 5 5 - 1 - - 29 60828.50 to 60856.50 22 23 - 11 - - SIO SIO0OPSFIN 23 22 - 9 - - 29 60828.50 to 60856.50 30 31 - 20 - - EMR EMR0OPSRAP 3 2 - 0 - - 29 60828.50 to 60856.50 41 42 - 10 - - IAA gnss.res 0 0 - 0 - - 29 60828.50 to 60856.50 52 61 - 21 - - GRGS GRG0OPSFIN 263 263 - 0 - - 29 60828.50 to 60856.50 22 21 - 12 - - ASI asi*.erp 10 10 - 0 - - 13 60828.50 to 60840.50 18 13 - 41 - - MIT MIT0OPSFIN 10 10 - 1 - - 29 60828.50 to 60856.50 32 29 - 12 - - IGS * IGS0OPSRAP 9 7 - 2 - - 29 60828.50 to 60856.50 20 21 - 12 - - IGS * IGS0OPSFIN 4 6 - 2 - - 29 60828.50 to 60856.50 19 18 - 11 - - SLR MCC tg*.02 173 263 - 32 - - 30 60828.00 to 60857.00 156 106 - 241 - - IAA slr_v.dat 78 107 - 5 - - 28 60828.00 to 60856.00 297 311 - 27 - - ASI asi.*.eop 54 79 - 13 - - 29 60828.50 to 60856.50 133 200 - 56 - - ILRS * ilrsa.eop 32 46 - 7 - - 29 60828.50 to 60856.50 97 159 - 30 - - BULLETIN A NEOS mark3.out 23 16 13 - - - 30 60828.00 to 60857.00 29 37 14 - - - To unsubscribe : http://hpiers.obspm.fr/eop-pc/products/bulletins/bulletin_registration.html