BULLETIN B 446 3 April 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 0.050 0.042 0.0401 0.062 0.056 2025 2 2 60708 101.827 308.809 46.8524 0.322 -0.014 0.053 0.039 0.0278 0.044 0.044 2025 2 3 60709 99.723 309.165 46.2405 0.296 0.038 0.051 0.040 0.0420 0.045 0.046 2025 2 4 60710 97.349 309.477 45.7248 0.286 0.075 0.049 0.040 0.0553 0.046 0.048 2025 2 5 60711 95.063 309.782 45.4436 0.327 0.065 0.049 0.041 0.0761 0.045 0.045 2025 2 6 60712 92.387 309.898 45.4707 0.386 0.032 0.049 0.042 0.0794 0.042 0.040 2025 2 7 60713 89.773 310.110 45.7598 0.445 -0.011 0.050 0.044 0.0581 0.039 0.036 2025 2 8 60714 87.064 310.410 46.1948 0.468 -0.051 0.052 0.043 0.0408 0.041 0.036 2025 2 9 60715 85.226 310.383 46.6416 0.466 -0.088 0.056 0.044 0.0177 0.044 0.039 2025 2 10 60716 84.498 310.947 46.9932 0.454 -0.120 0.055 0.044 0.0069 0.048 0.042 2025 2 11 60717 83.779 311.651 47.1954 0.436 -0.142 0.052 0.042 0.0142 0.051 0.044 2025 2 12 60718 83.222 312.325 47.2209 0.425 -0.134 0.051 0.042 0.0163 0.054 0.046 2025 2 13 60719 82.841 313.017 47.0706 0.416 -0.118 0.050 0.041 0.0190 0.058 0.047 2025 2 14 60720 82.640 314.021 46.7487 0.406 -0.111 0.049 0.041 0.0243 0.061 0.049 2025 2 15 60721 82.369 314.876 46.3143 0.391 -0.167 0.048 0.042 0.0325 0.064 0.053 2025 2 16 60722 81.693 315.721 45.9196 0.377 -0.254 0.048 0.043 0.0433 0.068 0.061 2025 2 17 60723 81.059 317.039 45.6163 0.368 -0.337 0.048 0.043 0.0617 0.073 0.069 2025 2 18 60724 79.822 318.112 45.4443 0.367 -0.396 0.049 0.044 0.0832 0.077 0.075 2025 2 19 60725 78.611 318.815 45.4607 0.392 -0.356 0.048 0.045 0.0695 0.074 0.071 2025 2 20 60726 77.239 319.541 45.6342 0.427 -0.278 0.048 0.044 0.0480 0.069 0.062 2025 2 21 60727 75.585 320.448 45.9125 0.460 -0.196 0.048 0.044 0.0378 0.064 0.054 2025 2 22 60728 74.331 321.356 46.3145 0.472 -0.162 0.048 0.046 0.0309 0.064 0.053 2025 2 23 60729 72.668 321.821 46.7799 0.469 -0.163 0.048 0.046 0.0240 0.065 0.055 2025 2 24 60730 71.523 322.200 47.1800 0.458 -0.187 0.049 0.046 0.0297 0.067 0.056 2025 2 25 60731 70.391 322.954 47.4161 0.441 -0.230 0.050 0.044 0.0335 0.068 0.057 2025 2 26 60732 69.942 323.362 47.4081 0.420 -0.310 0.053 0.042 0.0360 0.078 0.067 2025 2 27 60733 70.341 324.185 47.1096 0.399 -0.395 0.053 0.041 0.0359 0.094 0.083 2025 2 28 60734 70.423 324.983 46.4841 0.382 -0.460 0.052 0.041 0.0410 0.108 0.098 2025 3 1 60735 70.334 325.981 45.6491 0.382 -0.426 0.055 0.042 0.0371 0.104 0.095 Preliminary extension 2025 3 2 60736 69.649 327.426 44.7529 0.393 -0.334 0.053 0.042 0.0303 0.091 0.081 2025 3 3 60737 68.948 328.431 43.9219 0.412 -0.228 0.053 0.041 0.0278 0.076 0.066 2025 3 4 60738 68.458 329.659 43.3464 0.438 -0.133 0.050 0.041 0.0293 0.065 0.055 2025 3 5 60739 67.820 331.181 43.1179 0.478 -0.123 0.046 0.038 0.0351 0.076 0.062 2025 3 6 60740 66.981 332.747 43.1593 0.517 -0.148 0.043 0.037 0.0422 0.097 0.077 2025 3 7 60741 66.108 334.097 43.3765 0.543 -0.178 0.041 0.036 0.0436 0.115 0.091 2025 3 8 60742 65.398 335.500 43.7023 0.505 -0.171 0.041 0.035 0.0367 0.116 0.092 2025 3 9 60743 64.850 336.816 44.0341 0.435 -0.143 0.040 0.035 0.0291 0.111 0.089 2025 3 10 60744 64.563 338.397 44.2567 0.370 -0.114 0.039 0.034 0.0263 0.106 0.086 2025 3 11 60745 64.345 340.292 44.3171 0.329 -0.092 0.039 0.034 0.0250 0.102 0.084 2025 3 12 60746 63.659 342.419 44.1924 0.398 -0.107 0.040 0.035 0.0215 0.100 0.084 2025 3 13 60747 63.145 344.418 43.8781 0.504 -0.136 0.041 0.035 0.0180 0.099 0.085 2025 3 14 60748 62.321 346.810 43.4169 0.602 -0.166 0.043 0.035 0.0154 0.098 0.086 2025 3 15 60749 61.215 348.446 42.8895 0.686 -0.210 0.044 0.036 0.0136 0.105 0.101 2025 3 16 60750 60.489 350.259 42.3806 0.715 -0.242 0.046 0.037 0.0100 0.118 0.125 2025 3 17 60751 60.386 352.123 41.9777 0.650 -0.237 0.049 0.038 0.0084 0.128 0.145 2025 3 18 60752 60.433 353.809 41.7068 0.456 -0.176 0.050 0.040 0.0082 0.133 0.156 2025 3 19 60753 60.358 355.450 41.5522 0.291 -0.125 0.051 0.041 0.0090 0.500 0.500 2025 3 20 60754 60.103 357.208 41.5455 0.295 -0.127 0.052 0.043 0.0107 0.500 0.500 2025 3 21 60755 59.353 358.785 41.6488 0.300 -0.132 0.053 0.044 0.0124 0.500 0.500 2025 3 22 60756 58.688 360.016 41.8413 0.308 -0.142 0.055 0.045 0.0137 0.500 0.500 2025 3 23 60757 57.706 361.704 42.0809 0.316 -0.154 0.056 0.045 0.0136 0.500 0.500 2025 3 24 60758 57.259 362.837 42.2359 0.322 -0.167 0.057 0.046 0.0147 0.500 0.500 2025 3 25 60759 57.668 364.032 42.2018 0.322 -0.178 0.058 0.047 0.0166 0.500 0.500 2025 3 26 60760 57.842 365.567 41.9294 0.314 -0.185 0.059 0.048 0.0184 0.500 0.500 2025 3 27 60761 57.974 367.358 41.3664 0.297 -0.187 0.063 0.050 0.0191 0.500 0.500 2025 3 28 60762 57.967 369.246 40.5138 0.275 -0.184 0.068 0.054 0.0198 0.500 0.500 2025 3 29 60763 57.925 371.022 39.4448 0.253 -0.175 0.078 0.059 0.0210 0.500 0.500 2025 3 30 60764 58.222 372.695 38.3618 0.235 -0.163 0.092 0.067 0.0212 0.500 0.500 2025 3 31 60765 58.427 374.497 37.5023 0.225 -0.148 0.112 0.081 0.0231 0.500 0.500 2025 4 1 60766 58.291 376.266 36.9192 0.225 -0.135 0.143 0.100 0.0280 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 2 2 60708 -112.418 -6.709 0.111 0.044 2025 2 3 60709 -112.895 -6.744 0.114 0.046 2025 2 4 60710 -113.295 -6.809 0.116 0.048 2025 2 5 60711 -113.393 -6.876 0.112 0.045 2025 2 6 60712 -113.270 -6.935 0.105 0.040 2025 2 7 60713 -113.014 -7.025 0.099 0.036 2025 2 8 60714 -112.720 -7.180 0.102 0.036 2025 2 9 60715 -112.343 -7.397 0.111 0.039 2025 2 10 60716 -111.912 -7.616 0.121 0.042 2025 2 11 60717 -111.559 -7.732 0.128 0.044 2025 2 12 60718 -111.356 -7.647 0.135 0.046 2025 2 13 60719 -111.277 -7.419 0.145 0.047 2025 2 14 60720 -111.239 -7.209 0.154 0.049 2025 2 15 60721 -111.256 -7.216 0.161 0.053 2025 2 16 60722 -111.384 -7.418 0.172 0.061 2025 2 17 60723 -111.611 -7.660 0.185 0.069 2025 2 18 60724 -111.831 -7.822 0.193 0.075 2025 2 19 60725 -111.904 -7.870 0.186 0.071 2025 2 20 60726 -111.851 -7.987 0.173 0.062 2025 2 21 60727 -111.682 -8.230 0.161 0.054 2025 2 22 60728 -111.429 -8.506 0.160 0.053 2025 2 23 60729 -111.180 -8.656 0.164 0.055 2025 2 24 60730 -111.148 -8.701 0.168 0.056 2025 2 25 60731 -111.407 -8.797 0.171 0.057 2025 2 26 60732 -111.678 -8.994 0.195 0.067 2025 2 27 60733 -111.613 -9.076 0.235 0.083 2025 2 28 60734 -111.284 -8.877 0.271 0.098 2025 3 1 60735 -111.110 -8.471 0.262 0.095 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 2 2 60708 0.6376 0.0268 15.04106706767 0.00000000467 2025 2 3 60709 0.5847 0.0277 15.04106707688 0.00000000482 2025 2 4 60710 0.4170 0.0270 15.04106710608 0.00000000470 2025 2 5 60711 0.1345 0.0269 15.04106715526 0.00000000468 2025 2 6 60712 -0.1769 0.0291 15.04106720947 0.00000000507 2025 2 7 60713 -0.3860 0.0308 15.04106724587 0.00000000536 2025 2 8 60714 -0.4696 0.0326 15.04106726042 0.00000000568 2025 2 9 60715 -0.4091 0.0376 15.04106724989 0.00000000655 2025 2 10 60716 -0.2764 0.0365 15.04106722679 0.00000000635 2025 2 11 60717 -0.1313 0.0431 15.04106720153 0.00000000750 2025 2 12 60718 0.0617 0.0356 15.04106716793 0.00000000620 2025 2 13 60719 0.2410 0.0314 15.04106713672 0.00000000547 2025 2 14 60720 0.3902 0.0279 15.04106711074 0.00000000486 2025 2 15 60721 0.4432 0.0256 15.04106710152 0.00000000446 2025 2 16 60722 0.3623 0.0243 15.04106711560 0.00000000423 2025 2 17 60723 0.2430 0.0235 15.04106713637 0.00000000409 2025 2 18 60724 0.0818 0.0234 15.04106716443 0.00000000407 2025 2 19 60725 -0.1003 0.0237 15.04106719613 0.00000000413 2025 2 20 60726 -0.2374 0.0243 15.04106722000 0.00000000423 2025 2 21 60727 -0.3421 0.0239 15.04106723823 0.00000000416 2025 2 22 60728 -0.4440 0.0234 15.04106725596 0.00000000407 2025 2 23 60729 -0.4541 0.0235 15.04106725772 0.00000000409 2025 2 24 60730 -0.3362 0.0238 15.04106723720 0.00000000414 2025 2 25 60731 -0.1281 0.0240 15.04106720097 0.00000000418 2025 2 26 60732 0.1508 0.0246 15.04106715242 0.00000000428 2025 2 27 60733 0.4680 0.0248 15.04106709720 0.00000000432 2025 2 28 60734 0.7581 0.0244 15.04106704670 0.00000000425 2025 3 1 60735 0.8938 0.0241 15.04106702307 0.00000000420 4 - INFORMATION ON TIME SCALES TAI - UTC = 37 s. during period [60708-60735] No leap second introduced during period [60708-60735] 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 GSFC gsf2023a.eoxy 50 51 3 9 34 34 12 60710.21 to 60734.27 109 110 25 13 65 101 IAA iaa2021a.eops 61 71 4 - 57 59 11 60710.21 to 60734.27 96 136 29 - 70 90 USNO usn2024b.eoxy 45 47 3 - 42 45 9 60710.21 to 60734.27 112 77 25 - 39 112 IVS * ivs2023a.eoxy 59 91 8 - 41 43 8 60710.20 to 60734.27 95 169 31 - 5 7 ASI asi2024a.eoxy 89 91 11 - 111 97 12 60710.21 to 60734.27 3630 2040 108 - 155 147 VIE vie2023a.eopxy 164 190 14 - - - 18 60710.00 to 60735.00 421 455 14 - - - VIE vie2023a.eoxy - - - - 44 38 11 60710.21 to 60734.27 - - - - 86 101 VLBI Intensive GSI * gsiint2d.eopi - - 2 - - - 6 60708.33 to 60729.33 - - 27 - - - BKG * bkg2023b.eopi - - 6 - - - 62 60708.25 to 60734.75 - - 44 - - - GSFC * gsf2023a.eopi - - 11 - - - 87 60708.25 to 60734.75 - - 51 - - - IAA * iaa2021a.eopi - - 7 - - - 84 60708.25 to 60734.75 - - 25 - - - USNO * usn2024b.eopi - - 11 - - - 57 60708.25 to 60734.75 - - 31 - - - VIE vie2023a.eopi - - 13 - - - 73 60708.25 to 60734.75 - - 69 - - - DGFI dgf2024a.eopi - - 7 - - - 32 60708.25 to 60734.75 - - 33 - - - GPS CODE COD0OPSFIN 3 3 - 0 - - 27 60708.50 to 60734.50 40 26 - 19 - - JPL JPL0OPSFIN 5 5 - 3 - - 27 60708.50 to 60734.50 58 31 - 21 - - GFZ GFZ0OPSFIN 4 4 - 1 - - 27 60708.50 to 60734.50 46 27 - 19 - - ESA ESA0OPSFIN 5 5 - 1 - - 27 60708.50 to 60734.50 43 33 - 17 - - SIO SIO0OPSFIN 24 23 - 10 - - 27 60708.50 to 60734.50 59 32 - 22 - - EMR EMR0OPSRAP 3 3 - 1 - - 27 60708.50 to 60734.50 58 36 - 19 - - IAA gnss.res 0 0 - 0 - - 26 60708.50 to 60734.50 48 71 - 24 - - GRGS GRG0OPSFIN 264 264 - 0 - - 27 60708.50 to 60734.50 41 29 - 16 - - ASI asi*.erp 10 9 - 0 - - 16 60708.50 to 60734.50 23 29 - 43 - - MIT MIT0OPSFIN 10 9 - 1 - - 27 60708.50 to 60734.50 59 36 - 22 - - IGS * IGS0OPSRAP 10 10 - 3 - - 27 60708.50 to 60734.50 41 30 - 18 - - IGS * IGS0OPSFIN 7 7 - 1 - - 27 60708.50 to 60734.50 29 25 - 15 - - SLR MCC tg*.02 247 264 - 26 - - 28 60708.00 to 60735.00 160 213 - 100 - - IAA slr_v.dat 77 84 - 5 - - 27 60708.00 to 60735.00 297 200 - 32 - - ASI asi.*.eop 57 61 - 16 - - 27 60708.50 to 60734.50 169 171 - 81 - - ILRS * ilrsa.eop 44 43 - 9 - - 27 60708.50 to 60734.50 117 145 - 29 - - BULLETIN A NEOS mark3.out 14 18 12 - - - 28 60708.00 to 60735.00 47 36 20 - - - To unsubscribe : http://hpiers.obspm.fr/eop-pc/products/bulletins/bulletin_registration.html