BULLETIN B 458 1 April 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 0.040 0.040 0.0132 0.543 1.118 2026 2 2 61073 91.976 362.458 70.4043 0.499 -0.048 0.049 0.043 0.0214 3.834 4.254 2026 2 3 61074 91.883 363.524 69.9148 0.490 -0.035 0.047 0.042 0.0448 3.845 4.266 2026 2 4 61075 92.090 364.347 69.2974 0.471 -0.019 0.045 0.041 0.0259 3.808 4.225 2026 2 5 61076 92.330 365.716 68.6030 0.448 0.001 0.037 0.036 0.0143 0.732 0.800 2026 2 6 61077 92.721 367.125 67.9779 0.426 0.023 0.038 0.034 0.0112 0.072 0.065 2026 2 7 61078 93.294 368.421 67.5140 0.414 0.052 0.047 0.042 0.0084 0.070 0.063 2026 2 8 61079 93.859 369.226 67.2412 0.409 0.083 0.049 0.043 0.0068 0.096 0.579 2026 2 9 61080 95.355 369.937 67.1668 0.410 0.112 0.048 0.044 0.0094 0.285 4.362 2026 2 10 61081 96.900 371.397 67.3064 0.413 0.137 0.041 0.039 0.0177 0.285 4.374 2026 2 11 61082 98.465 372.782 67.6462 0.420 0.154 0.038 0.040 0.0182 0.284 4.329 2026 2 12 61083 99.675 374.355 68.1324 0.428 0.161 0.048 0.050 0.0139 0.146 0.857 2026 2 13 61084 100.509 375.429 68.6773 0.436 0.153 0.038 0.041 0.0123 0.117 0.125 2026 2 14 61085 101.234 376.857 69.2134 0.446 0.111 0.038 0.040 0.0102 0.116 0.123 2026 2 15 61086 101.484 377.888 69.6746 0.454 0.047 0.039 0.039 0.0084 0.109 0.114 2026 2 16 61087 101.827 378.420 69.9547 0.456 -0.030 0.040 0.037 0.0086 0.059 0.055 2026 2 17 61088 102.584 379.524 69.9246 0.451 -0.111 0.038 0.039 0.0099 0.059 0.055 2026 2 18 61089 103.132 380.819 69.5893 0.424 -0.192 0.036 0.038 0.0114 0.060 0.060 2026 2 19 61090 103.822 381.666 69.0069 0.388 -0.265 0.048 0.051 0.0129 0.159 0.482 2026 2 20 61091 104.914 382.325 68.3084 0.353 -0.319 0.049 0.050 0.0133 0.179 0.567 2026 2 21 61092 105.907 383.465 67.6308 0.329 -0.323 0.039 0.038 0.0099 0.179 0.568 2026 2 22 61093 106.709 384.695 67.0485 0.316 -0.292 0.040 0.037 0.0071 0.163 0.500 2026 2 23 61094 107.244 385.918 66.6063 0.313 -0.244 0.038 0.038 0.0073 0.061 0.054 2026 2 24 61095 107.489 386.589 66.3875 0.323 -0.186 0.036 0.037 0.0092 0.061 0.053 2026 2 25 61096 106.876 387.248 66.4518 0.360 -0.132 0.035 0.036 0.0115 0.061 0.053 2026 2 26 61097 105.992 387.792 66.7284 0.405 -0.085 0.035 0.039 0.0136 0.089 0.083 2026 2 27 61098 105.552 387.935 67.0483 0.444 -0.051 0.037 0.040 0.0142 0.095 0.089 2026 2 28 61099 105.499 388.354 67.2503 0.437 -0.071 0.035 0.040 0.0096 0.095 0.090 2026 3 1 61100 105.015 389.153 67.2285 0.403 -0.120 0.036 0.039 0.0071 0.092 0.086 Preliminary extension 2026 3 2 61101 104.942 389.676 66.9336 0.368 -0.168 0.030 0.032 0.0075 0.065 0.058 2026 3 3 61102 105.327 390.168 66.3885 0.344 -0.199 0.029 0.029 0.0109 0.065 0.058 2026 3 4 61103 105.581 391.070 65.6671 0.377 -0.156 0.028 0.029 0.0192 0.065 0.058 2026 3 5 61104 105.234 392.012 64.8641 0.432 -0.082 0.028 0.029 0.0246 0.072 0.063 2026 3 6 61105 104.790 392.365 64.1137 0.488 -0.002 0.027 0.029 0.0172 0.074 0.064 2026 3 7 61106 104.897 392.662 63.5051 0.513 0.053 0.027 0.030 0.0141 0.074 0.064 2026 3 8 61107 104.032 393.205 63.0990 0.518 0.086 0.027 0.030 0.0145 0.299 0.068 2026 3 9 61108 103.143 393.301 62.8896 0.515 0.103 0.027 0.030 0.0148 1.771 0.093 2026 3 10 61109 102.921 393.942 62.7681 0.512 0.103 0.027 0.029 0.0157 1.775 0.094 2026 3 11 61110 103.183 394.255 62.6944 0.530 0.070 0.027 0.030 0.0198 1.756 0.093 2026 3 12 61111 103.034 394.946 62.6783 0.549 0.024 0.027 0.030 0.0232 0.336 0.048 2026 3 13 61112 102.799 395.394 62.6693 0.561 -0.022 0.028 0.030 0.0205 0.048 0.039 2026 3 14 61113 102.839 396.041 62.5430 0.534 -0.035 0.028 0.030 0.0194 0.047 0.039 2026 3 15 61114 103.178 396.890 62.2262 0.485 -0.028 0.030 0.032 0.0124 0.046 0.039 2026 3 16 61115 104.093 397.577 61.6561 0.435 -0.017 0.033 0.035 0.0110 0.035 0.041 2026 3 17 61116 104.761 398.757 60.8522 0.395 -0.007 0.034 0.037 0.0103 0.035 0.041 2026 3 18 61117 105.011 399.465 59.8589 0.527 -0.046 0.035 0.037 0.0102 0.035 0.041 2026 3 19 61118 105.656 400.141 58.7085 0.619 -0.083 0.035 0.037 0.0118 0.044 0.042 2026 3 20 61119 106.189 400.839 57.5214 0.529 -0.083 0.034 0.037 0.0119 0.049 0.045 2026 3 21 61120 106.429 401.627 56.4870 0.318 -0.153 0.034 0.037 0.0094 0.500 0.500 2026 3 22 61121 107.122 402.171 55.6759 0.319 -0.131 0.034 0.037 0.0089 0.500 0.500 2026 3 23 61122 108.147 402.944 55.2107 0.327 -0.112 0.034 0.037 0.0101 0.500 0.500 2026 3 24 61123 109.460 403.437 54.9688 0.338 -0.101 0.034 0.037 0.0124 0.500 0.500 2026 3 25 61124 110.756 403.975 54.9028 0.349 -0.100 0.034 0.037 0.0131 0.500 0.500 2026 3 26 61125 112.293 404.979 54.8373 0.359 -0.107 0.035 0.037 0.0143 0.500 0.500 2026 3 27 61126 113.962 406.210 54.6892 0.367 -0.119 0.036 0.038 0.0131 0.500 0.500 2026 3 28 61127 116.004 407.100 54.3676 0.372 -0.128 0.036 0.039 0.0105 0.500 0.500 2026 3 29 61128 118.693 407.944 53.7645 0.374 -0.131 0.039 0.040 0.0129 0.500 0.500 2026 3 30 61129 120.986 408.814 52.9392 0.371 -0.127 0.062 0.051 0.0252 0.500 0.500 2026 3 31 61130 122.676 409.255 51.9659 0.363 -0.118 0.140 0.089 0.0636 0.500 0.500 2026 4 1 61131 123.947 410.062 50.9504 0.351 -0.107 999.000 999.000 999.0000 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 2026 2 2 61073 -113.316 -7.662 9.638 4.254 2026 2 3 61074 -112.968 -7.525 9.665 4.266 2026 2 4 61075 -112.848 -7.492 9.573 4.225 2026 2 5 61076 -113.067 -7.556 1.841 0.800 2026 2 6 61077 -113.564 -7.696 0.180 0.065 2026 2 7 61078 -114.097 -7.863 0.176 0.063 2026 2 8 61079 -114.464 -7.978 0.241 0.579 2026 2 9 61080 -114.600 -7.987 0.716 4.362 2026 2 10 61081 -114.521 -7.940 0.717 4.374 2026 2 11 61082 -114.259 -7.963 0.713 4.329 2026 2 12 61083 -113.902 -8.135 0.366 0.857 2026 2 13 61084 -113.614 -8.394 0.293 0.125 2026 2 14 61085 -113.535 -8.608 0.293 0.123 2026 2 15 61086 -113.648 -8.682 0.274 0.114 2026 2 16 61087 -113.782 -8.643 0.148 0.055 2026 2 17 61088 -113.785 -8.583 0.148 0.055 2026 2 18 61089 -113.712 -8.560 0.151 0.060 2026 2 19 61090 -113.700 -8.571 0.400 0.482 2026 2 20 61091 -113.875 -8.600 0.450 0.567 2026 2 21 61092 -114.213 -8.623 0.450 0.568 2026 2 22 61093 -114.585 -8.664 0.411 0.500 2026 2 23 61094 -114.837 -8.732 0.153 0.054 2026 2 24 61095 -114.870 -8.819 0.152 0.053 2026 2 25 61096 -114.645 -8.938 0.153 0.053 2026 2 26 61097 -114.266 -9.103 0.225 0.083 2026 2 27 61098 -113.822 -9.297 0.240 0.089 2026 2 28 61099 -113.451 -9.492 0.240 0.090 2026 3 1 61100 -113.133 -9.587 0.230 0.086 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 2026 2 2 61073 0.3978 0.0079 15.04106710942 0.00000000138 2026 2 3 61074 0.5722 0.0077 15.04106707906 0.00000000134 2026 2 4 61075 0.6654 0.0066 15.04106706283 0.00000000115 2026 2 5 61076 0.6842 0.0065 15.04106705956 0.00000000113 2026 2 6 61077 0.5556 0.0072 15.04106708195 0.00000000125 2026 2 7 61078 0.3709 0.0070 15.04106711410 0.00000000122 2026 2 8 61079 0.1723 0.0084 15.04106714868 0.00000000146 2026 2 9 61080 -0.0316 0.0083 15.04106718417 0.00000000144 2026 2 10 61081 -0.2441 0.0082 15.04106722116 0.00000000143 2026 2 11 61082 -0.4246 0.0066 15.04106725259 0.00000000115 2026 2 12 61083 -0.5311 0.0065 15.04106727113 0.00000000113 2026 2 13 61084 -0.5543 0.0079 15.04106727517 0.00000000138 2026 2 14 61085 -0.5086 0.0077 15.04106726721 0.00000000134 2026 2 15 61086 -0.3882 0.0091 15.04106724625 0.00000000158 2026 2 16 61087 -0.1441 0.0087 15.04106720376 0.00000000151 2026 2 17 61088 0.1927 0.0081 15.04106714512 0.00000000141 2026 2 18 61089 0.4718 0.0067 15.04106709654 0.00000000117 2026 2 19 61090 0.6660 0.0068 15.04106706273 0.00000000118 2026 2 20 61091 0.7129 0.0078 15.04106705456 0.00000000136 2026 2 21 61092 0.6400 0.0074 15.04106706726 0.00000000129 2026 2 22 61093 0.5153 0.0095 15.04106708896 0.00000000165 2026 2 23 61094 0.3406 0.0112 15.04106711938 0.00000000195 2026 2 24 61095 0.0809 0.0083 15.04106716459 0.00000000144 2026 2 25 61096 -0.1865 0.0063 15.04106721114 0.00000000110 2026 2 26 61097 -0.3262 0.0067 15.04106723546 0.00000000117 2026 2 27 61098 -0.2886 0.0101 15.04106722891 0.00000000176 2026 2 28 61099 -0.1071 0.0078 15.04106719731 0.00000000136 2026 3 1 61100 0.1491 0.0087 15.04106715271 0.00000000151 4 - INFORMATION ON TIME SCALES TAI - UTC = 37 s. during period [61073-61100] No leap second introduced during period [61073-61100] 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 53 49 2 - 32 33 13 61074.21 to 61098.27 141 185 22 - 61 118 GSFC gsf2023a.eoxy 60 52 3 8 35 37 13 61074.21 to 61098.27 130 134 24 24 52 113 IAA iaa2021a.eops 164 172 9 - 114 120 13 61074.21 to 61098.27 295 204 19 - 78 101 IVS * ivs2025a.eoxy 110 120 7 - 88 94 8 61074.21 to 61098.27 52 125 15 - 4 16 ASI asi2023a.eoxy 100 126 31 - 260 228 1 61074.21 to 61074.21 0 0 0 - 0 0 VIE vie2023a.eopxy 206 222 9 - - - 19 61075.00 to 61099.00 355 283 9 - - - VIE vie2023a.eoxy - - - - 37 38 12 61075.50 to 61098.27 - - - - 65 136 VLBI Intensive GSI * gsiint2d.eopi - - 7 - - - 7 61078.33 to 61099.33 - - 23 - - - BKG * bkg2025b.eopi - - 10 - - - 64 61073.25 to 61100.00 - - 28 - - - GSFC * gsf2023a.eopi - - 14 - - - 68 61073.25 to 61100.00 - - 41 - - - IAA * iaa2021a.eopi - - 10 - - - 72 61073.25 to 61100.00 - - 21 - - - IAA * iaaq.eopi - - 29 - - - 27 61073.31 to 61099.31 - - 68 - - - USNO * usn2025b.eopi - - 12 - - - 59 61073.75 to 61100.00 - - 31 - - - VIE vie2023a.eopi - - 9 - - - 74 61073.25 to 61100.00 - - 47 - - - GPS CODE COD0OPSFIN 3 3 - 0 - - 27 61073.50 to 61099.50 35 30 - 13 - - JPL JPL0OPSFIN 4 4 - 4 - - 27 61073.50 to 61099.50 45 39 - 20 - - GFZ GFZ0OPSFIN 6 6 - 1 - - 27 61073.50 to 61099.50 36 40 - 17 - - ESA ESA0OPSFIN 5 5 - 1 - - 27 61073.50 to 61099.50 36 36 - 14 - - SIO SIO0OPSFIN 29 28 - 13 - - 27 61073.50 to 61099.50 50 44 - 29 - - EMR EMR0OPSRAP 3 3 - 0 - - 27 61073.50 to 61099.50 50 63 - 12 - - IAA gnss.res 0 0 - 0 - - 27 61073.50 to 61099.50 80 88 - 26 - - GRGS GRG0OPSFIN 266 266 - 0 - - 27 61073.50 to 61099.50 35 34 - 15 - - ASI asi*.erp 10 9 - 0 - - 21 61079.50 to 61099.50 25 38 - 57 - - MIT MIT0OPSFIN 10 10 - 1 - - 27 61073.50 to 61099.50 54 44 - 20 - - IGS * IGS0OPSRAP 10 8 - 2 - - 27 61073.50 to 61099.50 33 36 - 13 - - IGS * IGS0OPSFIN 6 7 - 1 - - 27 61073.50 to 61099.50 31 35 - 15 - - SLR MCC tg*.02 248 320 - 38 - - 28 61073.00 to 61100.00 122 173 - 94 - - IAA slr_v.dat 115 123 - 6 - - 26 61073.00 to 61100.00 382 306 - 28 - - ASI asi.*.eop 100 83 - 19 - - 27 61073.50 to 61099.50 233 250 - 100 - - ILRS * ilrsa.eop 66 61 - 11 - - 27 61073.50 to 61099.50 219 187 - 36 - - BULLETIN A NEOS mark3.out 15 19 12 - - - 28 61073.00 to 61100.00 39 50 14 - - - To unsubscribe : http://hpiers.obspm.fr/eop-pc/products/bulletins/bulletin_registration.html