BULLETIN B 456 3 February 2026 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 0.037 0.038 0.0131 3.494 4.755 2025 12 2 61011 130.206 316.151 78.8026 0.171 -0.052 0.036 0.038 0.0130 0.068 0.071 2025 12 3 61012 129.006 316.125 78.0189 0.347 0.097 0.037 0.038 0.0112 0.068 0.070 2025 12 4 61013 127.976 316.166 77.5342 0.303 -0.020 0.032 0.032 0.0107 0.098 0.095 2025 12 5 61014 127.128 316.037 77.3736 0.373 -0.005 0.048 0.047 0.0107 0.100 0.095 2025 12 6 61015 126.465 316.232 77.4530 0.416 0.011 0.038 0.038 0.0108 0.100 0.095 2025 12 7 61016 125.521 316.425 77.6012 0.438 0.024 0.039 0.038 0.0114 0.890 0.389 2025 12 8 61017 124.915 316.681 77.6193 0.448 0.031 0.040 0.039 0.0129 5.997 2.285 2025 12 9 61018 123.898 316.848 77.3954 0.450 0.030 0.040 0.039 0.0138 6.011 2.291 2025 12 10 61019 122.817 316.736 76.9882 0.443 0.011 0.039 0.039 0.0133 6.079 2.418 2025 12 11 61020 121.633 316.853 76.4886 0.430 -0.018 0.038 0.040 0.0124 11.490 12.549 2025 12 12 61021 120.829 316.491 75.9929 0.416 -0.052 0.039 0.038 0.0122 12.632 14.686 2025 12 13 61022 120.480 316.617 75.5660 0.407 -0.089 0.041 0.038 0.0121 12.634 14.691 2025 12 14 61023 120.216 316.666 75.1882 0.403 -0.126 0.041 0.042 0.0123 11.098 14.150 2025 12 15 61024 120.171 317.378 74.9163 0.402 -0.158 0.039 0.040 0.0131 0.634 10.460 2025 12 16 61025 118.926 318.105 74.8570 0.406 -0.181 0.039 0.041 0.0142 0.603 10.448 2025 12 17 61026 117.553 318.139 74.9494 0.423 -0.189 0.038 0.041 0.0150 0.598 10.339 2025 12 18 61027 116.443 318.319 75.2215 0.443 -0.183 0.037 0.041 0.0142 0.183 1.861 2025 12 19 61028 115.249 318.416 75.6890 0.460 -0.164 0.038 0.041 0.0123 0.097 0.103 2025 12 20 61029 113.621 319.057 76.2437 0.463 -0.121 0.039 0.040 0.0115 0.097 0.099 2025 12 21 61030 112.815 319.386 76.8078 0.455 -0.063 0.040 0.040 0.0116 0.099 0.102 2025 12 22 61031 112.318 320.414 77.2870 0.439 0.002 0.042 0.042 0.0131 0.330 0.407 2025 12 23 61032 111.223 321.213 77.5798 0.417 0.069 0.041 0.042 0.0134 1.832 2.360 2025 12 24 61033 110.336 321.861 77.6301 0.387 0.132 0.037 0.041 0.0136 6.544 8.486 2025 12 25 61034 109.134 322.678 77.4020 0.360 0.168 0.036 0.040 0.0157 9.621 12.486 2025 12 26 61035 108.369 323.199 76.9267 0.336 0.171 0.037 0.039 0.0174 10.197 13.234 2025 12 27 61036 107.975 324.123 76.2682 0.318 0.150 0.031 0.032 0.0175 9.731 12.629 2025 12 28 61037 108.019 325.056 75.5546 0.303 0.111 0.039 0.037 0.0169 0.102 0.103 2025 12 29 61038 109.049 326.199 74.9295 0.293 0.059 0.032 0.031 0.0145 0.101 0.101 2025 12 30 61039 110.250 327.869 74.4521 0.288 0.001 0.030 0.029 0.0122 0.101 0.101 2025 12 31 61040 110.712 329.635 74.1645 0.304 -0.026 0.030 0.029 0.0117 0.101 0.101 2026 1 1 61041 110.518 331.170 74.0869 0.328 -0.041 0.031 0.029 0.0127 0.101 0.101 Preliminary extension 2026 1 2 61042 109.628 332.547 74.1827 0.353 -0.053 0.031 0.029 0.0147 0.101 0.101 2026 1 3 61043 108.236 333.532 74.3754 0.378 -0.060 0.042 0.037 0.0123 0.102 0.107 2026 1 4 61044 106.867 334.556 74.5120 0.398 -0.061 0.040 0.036 0.0116 0.102 0.107 2026 1 5 61045 105.574 335.529 74.4073 0.412 -0.058 0.033 0.030 0.0123 0.102 0.107 2026 1 6 61046 104.004 336.280 74.0508 0.417 -0.048 0.030 0.029 0.0136 0.102 0.107 2026 1 7 61047 102.558 336.902 73.5037 0.396 -0.023 0.029 0.028 0.0134 0.102 0.107 2026 1 8 61048 101.160 337.468 72.8588 0.369 0.003 0.029 0.028 0.0131 0.109 0.116 2026 1 9 61049 100.591 337.756 72.2567 0.345 0.025 0.030 0.028 0.0132 0.110 0.118 2026 1 10 61050 100.558 338.574 71.7736 0.334 0.029 0.030 0.028 0.0114 0.110 0.118 2026 1 11 61051 100.511 339.379 71.4611 0.334 0.021 0.030 0.028 0.0104 0.237 0.244 2026 1 12 61052 100.281 340.014 71.3576 0.341 0.006 0.030 0.028 0.0168 1.040 1.047 2026 1 13 61053 99.839 340.600 71.4372 0.355 -0.013 0.030 0.029 0.0440 1.042 1.049 2026 1 14 61054 99.299 340.904 71.7016 0.512 -0.024 0.030 0.029 0.0379 1.042 1.049 2026 1 15 61055 98.565 341.282 72.1249 0.717 -0.032 0.030 0.029 0.0235 1.042 1.049 2026 1 16 61056 97.259 341.700 72.6714 0.897 -0.037 0.030 0.029 0.0150 1.042 1.049 2026 1 17 61057 96.039 341.950 73.2872 1.016 -0.040 0.031 0.029 0.0091 0.099 0.102 2026 1 18 61058 94.865 342.641 73.8577 1.036 -0.038 0.034 0.031 0.0080 0.083 0.085 2026 1 19 61059 93.402 343.352 74.2507 0.920 -0.032 0.036 0.034 0.0083 0.084 0.086 2026 1 20 61060 92.262 344.588 74.3506 0.631 -0.021 0.037 0.035 0.0085 0.090 0.092 2026 1 21 61061 91.595 346.007 74.1857 0.378 -0.217 0.038 0.036 0.0091 0.500 0.500 2026 1 22 61062 91.297 347.643 73.7348 0.368 -0.231 0.039 0.036 0.0105 0.500 0.500 2026 1 23 61063 91.149 349.269 73.0401 0.357 -0.231 0.039 0.035 0.0106 0.500 0.500 2026 1 24 61064 91.564 350.662 72.2392 0.349 -0.216 0.039 0.035 0.0085 0.500 0.500 2026 1 25 61065 91.993 352.388 71.4968 0.345 -0.194 0.038 0.035 0.0091 0.500 0.500 2026 1 26 61066 91.842 353.654 70.9042 0.345 -0.175 0.037 0.035 0.0122 0.500 0.500 2026 1 27 61067 91.920 354.770 70.5378 0.347 -0.166 0.037 0.035 0.0153 0.500 0.500 2026 1 28 61068 92.078 356.081 70.3790 0.350 -0.170 0.036 0.035 0.0154 0.500 0.500 2026 1 29 61069 91.837 357.434 70.4117 0.355 -0.182 0.036 0.035 0.0128 0.500 0.500 2026 1 30 61070 91.649 358.808 70.5649 0.362 -0.195 0.036 0.035 0.0143 0.500 0.500 2026 1 31 61071 91.762 360.240 70.6800 0.371 -0.201 0.038 0.035 0.0236 0.500 0.500 2026 2 1 61072 91.835 361.466 70.6607 0.378 -0.197 0.039 0.036 0.0516 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 12 2 61011 -115.966 -7.423 0.170 0.071 2025 12 3 61012 -115.826 -7.271 0.172 0.070 2025 12 4 61013 -115.832 -7.647 0.247 0.095 2025 12 5 61014 -115.122 -7.828 0.251 0.095 2025 12 6 61015 -114.506 -7.693 0.252 0.095 2025 12 7 61016 -114.348 -7.426 2.237 0.389 2025 12 8 61017 -114.447 -7.362 15.074 2.285 2025 12 9 61018 -114.452 -7.498 15.110 2.291 2025 12 10 61019 -114.390 -7.536 15.281 2.418 2025 12 11 61020 -114.500 -7.327 28.884 12.549 2025 12 12 61021 -114.778 -7.060 31.754 14.686 2025 12 13 61022 -114.972 -6.966 31.759 14.691 2025 12 14 61023 -114.967 -7.043 27.899 14.150 2025 12 15 61024 -114.858 -7.142 1.595 10.460 2025 12 16 61025 -114.751 -7.211 1.516 10.448 2025 12 17 61026 -114.655 -7.331 1.502 10.339 2025 12 18 61027 -114.606 -7.547 0.460 1.861 2025 12 19 61028 -114.623 -7.738 0.243 0.103 2025 12 20 61029 -114.655 -7.719 0.243 0.099 2025 12 21 61030 -114.562 -7.480 0.249 0.102 2025 12 22 61031 -114.308 -7.183 0.829 0.407 2025 12 23 61032 -114.029 -6.988 4.604 2.360 2025 12 24 61033 -113.888 -6.912 16.452 8.486 2025 12 25 61034 -113.893 -6.901 24.186 12.486 2025 12 26 61035 -113.950 -6.911 25.634 13.234 2025 12 27 61036 -114.004 -6.928 24.463 12.629 2025 12 28 61037 -114.096 -6.915 0.258 0.103 2025 12 29 61038 -114.328 -6.823 0.254 0.101 2025 12 30 61039 -114.750 -6.722 0.254 0.101 2025 12 31 61040 -115.167 -6.766 0.254 0.101 2026 1 1 61041 -115.295 -7.036 0.254 0.101 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 12 2 61011 0.9389 0.0181 15.04106701522 0.00000000315 2025 12 3 61012 0.6333 0.0162 15.04106706842 0.00000000282 2025 12 4 61013 0.3190 0.0149 15.04106712314 0.00000000259 2025 12 5 61014 0.0185 0.0184 15.04106717545 0.00000000320 2025 12 6 61015 -0.1435 0.0171 15.04106720365 0.00000000298 2025 12 7 61016 -0.1153 0.0193 15.04106719874 0.00000000336 2025 12 8 61017 0.0921 0.0184 15.04106716264 0.00000000320 2025 12 9 61018 0.3346 0.0175 15.04106712042 0.00000000305 2025 12 10 61019 0.4708 0.0157 15.04106709671 0.00000000273 2025 12 11 61020 0.5123 0.0175 15.04106708949 0.00000000305 2025 12 12 61021 0.4739 0.0176 15.04106709617 0.00000000306 2025 12 13 61022 0.3975 0.0155 15.04106710947 0.00000000270 2025 12 14 61023 0.3326 0.0180 15.04106712077 0.00000000313 2025 12 15 61024 0.1823 0.0181 15.04106714693 0.00000000315 2025 12 16 61025 -0.0291 0.0179 15.04106718374 0.00000000312 2025 12 17 61026 -0.1802 0.0161 15.04106721004 0.00000000280 2025 12 18 61027 -0.3699 0.0176 15.04106724306 0.00000000306 2025 12 19 61028 -0.5318 0.0179 15.04106727125 0.00000000312 2025 12 20 61029 -0.5736 0.0156 15.04106727853 0.00000000272 2025 12 21 61030 -0.5356 0.0167 15.04106727191 0.00000000291 2025 12 22 61031 -0.4018 0.0182 15.04106724862 0.00000000317 2025 12 23 61032 -0.1782 0.0173 15.04106720969 0.00000000301 2025 12 24 61033 0.0847 0.0150 15.04106716393 0.00000000261 2025 12 25 61034 0.3610 0.0158 15.04106711583 0.00000000275 2025 12 26 61035 0.5822 0.0194 15.04106707732 0.00000000338 2025 12 27 61036 0.7108 0.0168 15.04106705493 0.00000000292 2025 12 28 61037 0.6949 0.0198 15.04106705770 0.00000000345 2025 12 29 61038 0.5594 0.0156 15.04106708129 0.00000000272 2025 12 30 61039 0.3846 0.0140 15.04106711172 0.00000000244 2025 12 31 61040 0.1790 0.0142 15.04106714751 0.00000000247 2026 1 1 61041 -0.0217 0.0153 15.04106718245 0.00000000266 4 - INFORMATION ON TIME SCALES TAI - UTC = 37 s. during period [61011-61041] No leap second introduced during period [61011-61041] 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 bkg2025b.eoxy 52 55 3 - 32 32 13 61011.21 to 61039.21 124 135 23 - 63 96 GSFC gsf2023a.eoxy 54 56 3 8 33 34 13 61011.21 to 61039.21 180 196 26 4 59 105 IAA iaa2021a.eops 126 140 8 - 91 89 13 61011.21 to 61039.21 406 320 47 - 69 121 USNO usn2025b.eoxy 43 42 2 - 38 38 10 61011.21 to 61039.21 83 61 21 - 48 79 IVS * ivs2025a.eoxy 529 748 44 - 292 339 9 61011.21 to 61039.21 163 133 22 - 4 10 VIE vie2023a.eopxy 161 178 9 - - - 18 61011.00 to 61040.00 349 365 11 - - - VIE vie2023a.eoxy - - - - 37 41 12 61011.21 to 61039.21 - - - - 53 140 VLBI Intensive GSI * gsiint2d.eopi - - 15 - - - 8 61015.33 to 61037.33 - - 18 - - - BKG * bkg2025b.eopi - - 7 - - - 58 61011.75 to 61039.84 - - 48 - - - GSFC * gsf2023a.eopi - - 9 - - - 62 61011.75 to 61039.84 - - 52 - - - IAA * iaa2021a.eopi - - 6 - - - 62 61011.75 to 61039.84 - - 62 - - - IAA * iaaq.eopi - - 43 - - - 30 61011.31 to 61040.31 - - 65 - - - USNO * usn2025b.eopi - - 9 - - - 54 61011.75 to 61039.75 - - 35 - - - OPA opa2025b.eopi - - 7 - - - 35 61011.75 to 61028.00 - - 1494 - - - VIE vie2023a.eopi - - 6 - - - 62 61011.75 to 61039.84 - - 52 - - - DGFI dgf2024a.eopi - - 6 - - - 20 61011.75 to 61027.75 - - 36 - - - GPS CODE COD0OPSFIN 3 3 - 0 - - 30 61011.50 to 61040.50 46 25 - 12 - - JPL JPL0OPSFIN 4 4 - 3 - - 30 61011.50 to 61040.50 54 34 - 17 - - GFZ GFZ0OPSFIN 4 4 - 1 - - 30 61011.50 to 61040.50 43 36 - 13 - - ESA ESA0OPSFIN 5 5 - 1 - - 30 61011.50 to 61040.50 45 33 - 12 - - SIO SIO0OPSFIN 26 25 - 10 - - 30 61011.50 to 61040.50 67 39 - 19 - - EMR EMR0OPSRAP 3 3 - 0 - - 30 61011.50 to 61040.50 57 58 - 14 - - IAA gnss.res 0 0 - 0 - - 22 61012.50 to 61040.50 104 63 - 23 - - GRGS GRG0OPSFIN 268 268 - 0 - - 30 61011.50 to 61040.50 44 33 - 14 - - ASI asi*.erp 10 10 - 0 - - 8 61030.50 to 61037.50 22 35 - 39 - - MIT MIT0OPSFIN 10 9 - 1 - - 30 61011.50 to 61040.50 66 39 - 16 - - IGS * IGS0OPSRAP 10 8 - 2 - - 30 61011.50 to 61040.50 44 35 - 11 - - IGS * IGS0OPSFIN 7 6 - 2 - - 30 61011.50 to 61040.50 38 29 - 13 - - SLR MCC tg*.02 252 268 - 30 - - 31 61011.00 to 61041.00 157 307 - 94 - - IAA slr_v.dat 94 100 - 5 - - 30 61011.00 to 61040.00 333 269 - 20 - - ILRS * ilrsa.eop 56 53 - 10 - - 30 61011.50 to 61040.50 164 145 - 28 - - BULLETIN A NEOS mark3.out 14 14 10 - - - 31 61011.00 to 61041.00 47 53 9 - - - To unsubscribe : http://hpiers.obspm.fr/eop-pc/products/bulletins/bulletin_registration.html