BULLETIN B 464 1 October 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 C04 solution - consistent with ITRF 2020. 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 0.043 0.0238 3.106 2.861 2026 8 2 61254 222.428 364.675 12.2951 0.391 -0.321 0.045 0.044 0.0204 0.110 0.147 2026 8 3 61255 222.732 363.935 11.7718 0.400 -0.304 0.045 0.042 0.0214 0.091 0.099 2026 8 4 61256 222.615 362.934 11.2588 0.406 -0.270 0.043 0.044 0.0262 0.091 0.099 2026 8 5 61257 222.693 361.679 10.8379 0.409 -0.201 0.040 0.042 0.0293 0.091 0.099 2026 8 6 61258 222.942 360.818 10.6095 0.410 -0.124 0.041 0.043 0.0299 0.126 0.120 2026 8 7 61259 223.055 360.007 10.5935 0.409 -0.057 0.039 0.042 0.0288 0.133 0.124 2026 8 8 61260 223.536 359.523 10.7837 0.409 -0.048 0.039 0.043 0.0234 0.133 0.124 2026 8 9 61261 223.636 359.148 11.1357 0.409 -0.078 0.041 0.042 0.0181 0.133 0.121 2026 8 10 61262 223.273 358.688 11.5110 0.405 -0.124 0.040 0.042 0.0111 0.130 0.106 2026 8 11 61263 222.833 357.828 11.7152 0.397 -0.176 0.038 0.042 0.0145 0.130 0.106 2026 8 12 61264 222.847 356.952 11.6186 0.379 -0.214 0.046 0.055 0.0171 0.183 0.131 2026 8 13 61265 223.033 356.238 11.1571 0.356 -0.243 0.036 0.045 0.0221 4.427 2.186 2026 8 14 61266 223.120 355.074 10.3850 0.333 -0.265 0.036 0.045 0.0331 5.306 2.612 2026 8 15 61267 223.172 354.146 9.4504 0.313 -0.276 0.038 0.044 0.0246 5.308 2.613 2026 8 16 61268 223.048 352.996 8.5463 0.299 -0.275 0.037 0.043 0.0153 4.619 2.280 2026 8 17 61269 222.551 352.004 7.8060 0.291 -0.262 0.039 0.044 0.0142 0.066 0.079 2026 8 18 61270 221.630 351.150 7.2302 0.294 -0.235 0.037 0.043 0.0162 0.053 0.073 2026 8 19 61271 220.748 350.298 6.8712 0.321 -0.169 0.037 0.040 0.0183 0.054 0.074 2026 8 20 61272 219.593 349.538 6.7351 0.357 -0.098 0.037 0.041 0.0204 0.135 0.153 2026 8 21 61273 218.568 348.760 6.7540 0.394 -0.044 0.039 0.042 0.0237 0.152 0.169 2026 8 22 61274 217.545 347.812 6.8540 0.413 -0.073 0.040 0.044 0.0278 0.152 0.169 2026 8 23 61275 216.466 346.717 7.0141 0.420 -0.154 0.039 0.043 0.0198 0.139 0.157 2026 8 24 61276 215.299 345.655 7.0770 0.422 -0.251 0.041 0.042 0.0254 0.055 0.078 2026 8 25 61277 214.250 344.658 7.0542 0.420 -0.348 0.041 0.041 0.0212 0.055 0.078 2026 8 26 61278 213.326 343.685 6.8822 0.418 -0.400 0.042 0.043 0.0204 0.187 0.228 2026 8 27 61279 213.020 342.351 6.5032 0.417 -0.427 0.043 0.048 0.0303 10.287 11.762 2026 8 28 61280 212.862 341.472 5.8921 0.417 -0.440 0.044 0.049 0.0559 12.304 14.065 2026 8 29 61281 212.480 340.584 5.0872 0.420 -0.431 0.046 0.046 0.0279 12.309 14.071 2026 8 30 61282 212.115 339.944 4.1733 0.426 -0.407 0.046 0.045 0.0168 12.458 13.723 2026 8 31 61283 211.398 339.574 3.2723 0.433 -0.375 0.043 0.044 0.0222 13.437 11.440 2026 9 1 61284 210.880 339.260 2.4534 0.441 -0.340 0.042 0.046 0.0412 13.440 11.434 Preliminary extension 2026 9 2 61285 209.872 339.189 1.7603 0.450 -0.313 0.034 0.037 0.0317 13.299 11.364 2026 9 3 61286 208.744 338.511 1.2638 0.459 -0.289 0.032 0.035 0.0211 2.430 5.976 2026 9 4 61287 207.153 338.006 1.0283 0.464 -0.268 0.032 0.034 0.0217 0.216 4.878 2026 9 5 61288 205.218 337.090 0.9772 0.465 -0.258 0.032 0.034 0.0153 0.210 4.875 2026 9 6 61289 203.582 336.203 0.9339 0.458 -0.252 0.033 0.034 0.0105 0.198 4.237 2026 9 7 61290 202.401 335.245 0.7124 0.445 -0.241 0.033 0.035 0.0126 0.121 0.142 2026 9 8 61291 201.864 334.418 0.2614 0.423 -0.220 0.032 0.035 0.0202 0.121 0.130 2026 9 9 61292 201.175 334.187 -0.4623 0.380 -0.160 0.031 0.036 0.0284 0.126 0.131 2026 9 10 61293 200.227 333.853 -1.4440 0.332 -0.089 0.032 0.035 0.0335 0.567 0.193 2026 9 11 61294 198.589 333.477 -2.6071 0.289 -0.028 0.032 0.035 0.0360 0.664 0.207 2026 9 12 61295 196.400 332.594 -3.8214 0.353 -0.049 0.033 0.035 0.0342 0.665 0.207 2026 9 13 61296 194.476 331.667 -5.0255 0.447 -0.110 0.035 0.037 0.0130 0.593 0.190 2026 9 14 61297 192.981 330.565 -6.1630 0.474 -0.150 0.037 0.040 0.0131 0.060 0.064 2026 9 15 61298 191.639 329.506 -7.0914 0.375 -0.137 0.038 0.041 0.0157 0.062 0.068 2026 9 16 61299 190.860 329.171 -7.8634 0.270 -0.027 0.038 0.041 0.0161 0.500 0.500 2026 9 17 61300 190.041 329.135 -8.4705 0.282 -0.025 0.038 0.041 0.0167 0.500 0.500 2026 9 18 61301 189.086 329.064 -8.9475 0.295 -0.027 0.039 0.042 0.0122 0.500 0.500 2026 9 19 61302 187.674 329.302 -9.4183 0.307 -0.032 0.039 0.042 0.0097 0.500 0.500 2026 9 20 61303 186.126 329.086 -9.9561 0.314 -0.038 0.039 0.041 0.0105 0.500 0.500 2026 9 21 61304 185.047 328.491 -10.5746 0.315 -0.045 0.038 0.041 0.0143 0.500 0.500 2026 9 22 61305 183.792 328.218 -11.3728 0.311 -0.055 0.037 0.042 0.0173 0.500 0.500 2026 9 23 61306 182.441 327.644 -12.3364 0.306 -0.069 0.037 0.042 0.0120 0.500 0.500 2026 9 24 61307 181.483 327.286 -13.5045 0.300 -0.084 0.038 0.041 0.0099 0.500 0.500 2026 9 25 61308 180.841 326.976 -14.8269 0.294 -0.098 0.039 0.041 0.0122 0.500 0.500 2026 9 26 61309 180.010 326.608 -16.2936 0.287 -0.104 0.039 0.041 0.0154 0.500 0.500 2026 9 27 61310 179.108 326.129 -17.8397 0.277 -0.099 0.039 0.041 0.0125 0.500 0.500 2026 9 28 61311 178.414 325.758 -19.3193 0.265 -0.084 0.039 0.041 0.0118 0.500 0.500 2026 9 29 61312 177.501 325.989 -20.6157 0.254 -0.065 0.039 0.042 0.0154 0.500 0.500 2026 9 30 61313 176.069 325.804 -21.6855 0.246 -0.052 0.041 0.048 0.0247 0.500 0.500 2026 10 1 61314 174.610 325.225 -22.5085 0.247 -0.048 0.056 0.071 0.0412 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 8 2 61254 -121.732 -11.760 0.276 0.147 2026 8 3 61255 -121.893 -11.877 0.229 0.099 2026 8 4 61256 -122.003 -11.914 0.228 0.099 2026 8 5 61257 -122.131 -11.882 0.230 0.099 2026 8 6 61258 -122.322 -11.837 0.317 0.120 2026 8 7 61259 -122.503 -11.819 0.335 0.124 2026 8 8 61260 -122.527 -11.891 0.335 0.124 2026 8 9 61261 -122.352 -12.003 0.334 0.121 2026 8 10 61262 -122.129 -12.028 0.326 0.106 2026 8 11 61263 -122.077 -11.897 0.326 0.106 2026 8 12 61264 -122.243 -11.693 0.461 0.131 2026 8 13 61265 -122.418 -11.599 11.129 2.186 2026 8 14 61266 -122.481 -11.658 13.338 2.612 2026 8 15 61267 -122.636 -11.742 13.343 2.613 2026 8 16 61268 -123.150 -11.756 11.610 2.280 2026 8 17 61269 -123.931 -11.749 0.167 0.079 2026 8 18 61270 -124.539 -11.791 0.133 0.073 2026 8 19 61271 -124.623 -11.807 0.135 0.074 2026 8 20 61272 -124.293 -11.719 0.340 0.153 2026 8 21 61273 -123.851 -11.537 0.382 0.169 2026 8 22 61274 -123.531 -11.449 0.382 0.169 2026 8 23 61275 -123.373 -11.533 0.349 0.157 2026 8 24 61276 -123.368 -11.718 0.138 0.078 2026 8 25 61277 -123.491 -11.844 0.138 0.078 2026 8 26 61278 -123.645 -11.791 0.469 0.228 2026 8 27 61279 -123.724 -11.649 25.859 11.762 2026 8 28 61280 -123.723 -11.561 30.929 14.065 2026 8 29 61281 -123.743 -11.583 30.943 14.071 2026 8 30 61282 -123.869 -11.669 31.318 13.723 2026 8 31 61283 -124.069 -11.733 33.780 11.440 2026 9 1 61284 -124.237 -11.735 33.786 11.434 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 8 2 61254 0.4833 0.0200 15.04106709453 0.00000000348 2026 8 3 61255 0.5395 0.0195 15.04106708475 0.00000000339 2026 8 4 61256 0.4774 0.0192 15.04106709556 0.00000000334 2026 8 5 61257 0.3403 0.0175 15.04106711943 0.00000000305 2026 8 6 61258 0.1209 0.0194 15.04106715762 0.00000000338 2026 8 7 61259 -0.0957 0.0190 15.04106719533 0.00000000331 2026 8 8 61260 -0.2856 0.0167 15.04106722839 0.00000000291 2026 8 9 61261 -0.3899 0.0200 15.04106724655 0.00000000348 2026 8 10 61262 -0.3130 0.0096 15.04106723316 0.00000000167 2026 8 11 61263 -0.0685 0.0094 15.04106719060 0.00000000164 2026 8 12 61264 0.2770 0.0076 15.04106713045 0.00000000132 2026 8 13 61265 0.6327 0.0086 15.04106706853 0.00000000150 2026 8 14 61266 0.8802 0.0114 15.04106702544 0.00000000198 2026 8 15 61267 0.9517 0.0097 15.04106701299 0.00000000169 2026 8 16 61268 0.8402 0.0124 15.04106703240 0.00000000216 2026 8 17 61269 0.6540 0.0100 15.04106706482 0.00000000174 2026 8 18 61270 0.4776 0.0086 15.04106709553 0.00000000150 2026 8 19 61271 0.2427 0.0068 15.04106713642 0.00000000118 2026 8 20 61272 0.0465 0.0069 15.04106717058 0.00000000120 2026 8 21 61273 -0.0771 0.0092 15.04106719209 0.00000000160 2026 8 22 61274 -0.1220 0.0090 15.04106719991 0.00000000157 2026 8 23 61275 -0.1227 0.0118 15.04106720003 0.00000000205 2026 8 24 61276 -0.0416 0.0113 15.04106718591 0.00000000197 2026 8 25 61277 0.0877 0.0097 15.04106716340 0.00000000169 2026 8 26 61278 0.2758 0.0077 15.04106713066 0.00000000134 2026 8 27 61279 0.4934 0.0085 15.04106709278 0.00000000148 2026 8 28 61280 0.7164 0.0105 15.04106705395 0.00000000183 2026 8 29 61281 0.8806 0.0091 15.04106702537 0.00000000158 2026 8 30 61282 0.9269 0.0108 15.04106701731 0.00000000188 2026 8 31 61283 0.8713 0.0116 15.04106702699 0.00000000202 2026 9 1 61284 0.7574 0.0111 15.04106704682 0.00000000193 4 - INFORMATION ON TIME SCALES TAI - UTC = 37 s. during period [61254-61284] No leap second introduced during period [61254-61284] 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 75 113 4 - 61 69 13 61256.21 to 61280.27 162 438 23 - 51 138 GSFC gsf2023a.eoxy 77 113 4 11 62 69 13 61256.21 to 61280.27 166 441 26 9 41 116 IAA iaa2021a.eops 78 73 4 - 50 52 9 61257.23 to 61278.50 166 179 20 - 51 161 USNO usn2025b.eoxy 88 144 4 - 94 99 11 61256.21 to 61280.27 153 348 18 - 73 67 IVS * ivs2025a.eoxy 164 260 12 - 101 113 8 61256.21 to 61280.27 279 291 24 - 8 35 ASI asi2023a.eoxy 463 563 27 - 379 375 13 61256.21 to 61280.27 5402 3303 115 - 179 309 VIE vie2025b.eopxy 561 822 20 - - - 21 61256.00 to 61284.00 371 1513 5 - - - VIE vie2025b.eoxy - - - - 120 108 13 61256.21 to 61280.28 - - - - 44 117 VLBI Intensive GSI * gsiint2d.eopi - - 14 - - - 7 61254.33 to 61282.33 - - 23 - - - BKG * bkg2025b.eopi - - 9 - - - 57 61254.33 to 61283.75 - - 36 - - - GSFC * gsf2023a.eopi - - 13 - - - 65 61254.33 to 61283.75 - - 45 - - - IAA * iaa2021a.eopi - - 10 - - - 67 61254.33 to 61283.75 - - 46 - - - IAA * iaaq.eopi - - 27 - - - 29 61254.31 to 61283.31 - - 92 - - - USNO * usn2025b.eopi - - 15 - - - 66 61254.33 to 61283.75 - - 50 - - - OPA opa2026b.eopi - - 8 - - - 44 61254.33 to 61283.29 - - 1748 - - - VIE vie2025b.eopi - - 9 - - - 70 61254.33 to 61283.75 - - 39 - - - GPS CODE COD0OPSFIN 3 3 - 0 - - 30 61254.50 to 61283.50 28 21 - 15 - - JPL JPL0OPSFIN 4 4 - 3 - - 30 61254.50 to 61283.50 38 28 - 19 - - GFZ GFZ0OPSFIN 6 6 - 1 - - 30 61254.50 to 61283.50 32 22 - 16 - - ESA ESA0OPSFIN 5 5 - 1 - - 30 61254.50 to 61283.50 29 31 - 13 - - JGX JGX0OPSFIN 2 2 - 0 - - 30 61254.50 to 61283.50 27 23 - 14 - - SIO SIO0OPSFIN 24 22 - 10 - - 30 61254.50 to 61283.50 42 38 - 18 - - EMR EMR0OPSRAP 3 2 - 0 - - 30 61254.50 to 61283.50 43 40 - 13 - - IAA gnss.res 0 0 - 0 - - 29 61254.50 to 61283.50 63 63 - 23 - - GRGS GRG0OPSFIN 262 262 - 0 - - 30 61254.50 to 61283.50 28 24 - 15 - - ASI asi*.erp 10 9 - 0 - - 21 61254.50 to 61281.50 21 25 - 58 - - MIT MIT0OPSFIN 9 9 - 1 - - 30 61254.50 to 61283.50 44 33 - 17 - - IGS * IGS0OPSRAP 9 6 - 2 - - 30 61254.50 to 61283.50 27 25 - 15 - - IGS * IGS0OPSFIN 7 9 - 2 - - 30 61254.50 to 61283.50 23 19 - 15 - - SLR MCC tg*.02 301 303 - 41 - - 31 61254.00 to 61284.00 387 239 - 238 - - IAA slr_v.dat 79 99 - 6 - - 29 61254.00 to 61284.00 275 294 - 35 - - ASI asi.*.eop 66 84 - 18 - - 30 61254.50 to 61283.50 234 308 - 58 - - ILRS * ilrsa.eop 43 52 - 9 - - 30 61254.50 to 61283.50 160 193 - 28 - - BULLETIN A NEOS mark3.out 11 20 12 - - - 31 61254.00 to 61284.00 28 35 26 - - - To unsubscribe : http://hpiers.obspm.fr/eop-pc/products/bulletins/bulletin_registration.html