********************************************************************** * * * I E R S B U L L E T I N - A * * * * Rapid Service/Prediction of Earth Orientation * ********************************************************************** 28 December 2017 Vol. XXX No. 052 ______________________________________________________________________ GENERAL INFORMATION: To receive this information electronically, contact: ser7@maia.usno.navy.mil or use MJD = Julian Date - 2 400 000.5 days UT2-UT1 = 0.022 sin(2*pi*T) - 0.012 cos(2*pi*T) - 0.006 sin(4*pi*T) + 0.007 cos(4*pi*T) where pi = 3.14159265... and T is the date in Besselian years. TT = TAI + 32.184 seconds DUT1= (UT1-UTC) transmitted with time signals = +0.2 seconds beginning 30 Nov 2017 at 0000 UTC Beginning 1 January 2017: TAI-UTC = 37.000 000 seconds *********************************************************************** * * * Please note that daily and Bulletin A EOP data can be obtained from * * the primary Earth Orientation (EO) servers at: * * http://maia.usno.navy.mil ftp://maia.usno.navy.mil * * and from the backup EO server at: * * http://toshi.nofs.navy.mil ftp://toshi.nofs.navy.mil * * * * An additional backup mirror of the daily and Bulletin A EOP data * * is now hosted by NASA's Archive of Space Geodesy Data server at: * * ftp://cddis.gsfc.nasa.gov/pub/products/iers * * Daily EOP data will be uploaded here at 18:00 UTC, and * * Bulletin A EOP data should be available by 20:00 UTC. * * * * We are currently not able to receive email at * * ser7@maia.usno.navy.mil. Questions and enquiries can now be * * directed to the following email account: navobsy_eop.fct@navy.mil * * * * Distribution statement A. Approved for public release: * * distribution unlimited. * * * *********************************************************************** ________________________________________________________________________ The contributed observations used in the preparation of this Bulletin are available at . The contributed analysis results are based on data from Very Long Baseline Interferometry (VLBI), Satellite Laser Ranging (SLR), the Global Positioning System (GPS) satellites, Lunar Laser Ranging (LLR), and meteorological predictions of variations in Atmospheric Angular Momentum (AAM). ________________________________________________________________________ COMBINED EARTH ORIENTATION PARAMETERS: IERS Rapid Service MJD x error y error UT1-UTC error " " " " s s 17 12 22 58109 0.07198 .00009 0.23843 .00009 0.225820 0.000028 17 12 23 58110 0.07060 .00009 0.23854 .00009 0.225217 0.000025 17 12 24 58111 0.06941 .00009 0.23907 .00009 0.224466 0.000028 17 12 25 58112 0.06842 .00009 0.23982 .00009 0.223602 0.000017 17 12 26 58113 0.06773 .00009 0.24068 .00009 0.222647 0.000017 17 12 27 58114 0.06722 .00009 0.24172 .00009 0.221593 0.000016 17 12 28 58115 0.06659 .00009 0.24306 .00009 0.220450 0.000014 _______________________________________________________________________ PREDICTIONS: The following formulas will not reproduce the predictions given below, but may be used to extend the predictions beyond the end of this table. x = 0.1146 - 0.0145 cos A - 0.1358 sin A - 0.0349 cos C + 0.0095 sin C y = 0.3550 - 0.1247 cos A + 0.0073 sin A + 0.0095 cos C + 0.0349 sin C UT1-UTC = 0.2202 - 0.00101 (MJD - 58123) - (UT2-UT1) where A = 2*pi*(MJD-58115)/365.25 and C = 2*pi*(MJD-58115)/435. TAI-UTC(MJD 58116) = 37.0 The accuracy may be estimated from the expressions: S x,y = 0.00068 (MJD-58115)**0.80 S t = 0.00025 (MJD-58115)**0.75 Estimated accuracies are: Predictions 10 d 20 d 30 d 40 d Polar coord's 0.004 0.007 0.010 0.013 UT1-UTC 0.0014 0.0024 0.0032 0.0040 MJD x(arcsec) y(arcsec) UT1-UTC(sec) 2017 12 29 58116 0.0655 0.2444 0.21928 2017 12 30 58117 0.0642 0.2458 0.21817 2017 12 31 58118 0.0626 0.2472 0.21719 2018 1 1 58119 0.0608 0.2484 0.21637 2018 1 2 58120 0.0589 0.2495 0.21567 2018 1 3 58121 0.0571 0.2505 0.21502 2018 1 4 58122 0.0552 0.2514 0.21431 2018 1 5 58123 0.0534 0.2525 0.21352 2018 1 6 58124 0.0516 0.2535 0.21263 2018 1 7 58125 0.0498 0.2546 0.21167 2018 1 8 58126 0.0479 0.2556 0.21066 2018 1 9 58127 0.0461 0.2566 0.20966 2018 1 10 58128 0.0443 0.2577 0.20874 2018 1 11 58129 0.0426 0.2587 0.20793 2018 1 12 58130 0.0409 0.2599 0.20723 2018 1 13 58131 0.0393 0.2611 0.20664 2018 1 14 58132 0.0377 0.2623 0.20613 2018 1 15 58133 0.0361 0.2635 0.20569 2018 1 16 58134 0.0345 0.2648 0.20526 2018 1 17 58135 0.0329 0.2661 0.20479 2018 1 18 58136 0.0314 0.2674 0.20424 2018 1 19 58137 0.0298 0.2688 0.20357 2018 1 20 58138 0.0283 0.2702 0.20276 2018 1 21 58139 0.0267 0.2716 0.20180 2018 1 22 58140 0.0253 0.2730 0.20071 2018 1 23 58141 0.0238 0.2744 0.19951 2018 1 24 58142 0.0223 0.2758 0.19826 2018 1 25 58143 0.0209 0.2773 0.19700 2018 1 26 58144 0.0195 0.2788 0.19579 2018 1 27 58145 0.0182 0.2803 0.19466 2018 1 28 58146 0.0168 0.2818 0.19364 2018 1 29 58147 0.0155 0.2833 0.19269 2018 1 30 58148 0.0143 0.2849 0.19176 2018 1 31 58149 0.0130 0.2865 0.19077 2018 2 1 58150 0.0118 0.2881 0.18967 2018 2 2 58151 0.0106 0.2897 0.18843 2018 2 3 58152 0.0094 0.2913 0.18709 2018 2 4 58153 0.0083 0.2930 0.18571 2018 2 5 58154 0.0072 0.2947 0.18435 2018 2 6 58155 0.0061 0.2964 0.18308 2018 2 7 58156 0.0051 0.2981 0.18194 2018 2 8 58157 0.0041 0.2998 0.18093 2018 2 9 58158 0.0031 0.3015 0.18005 2018 2 10 58159 0.0022 0.3033 0.17928 2018 2 11 58160 0.0012 0.3051 0.17859 2018 2 12 58161 0.0003 0.3069 0.17794 2018 2 13 58162 -0.0005 0.3087 0.17728 2018 2 14 58163 -0.0013 0.3105 0.17657 2018 2 15 58164 -0.0021 0.3123 0.17577 2018 2 16 58165 -0.0029 0.3141 0.17486 2018 2 17 58166 -0.0036 0.3160 0.17382 2018 2 18 58167 -0.0043 0.3179 0.17265 2018 2 19 58168 -0.0049 0.3197 0.17138 2018 2 20 58169 -0.0056 0.3216 0.17005 2018 2 21 58170 -0.0061 0.3235 0.16871 2018 2 22 58171 -0.0067 0.3254 0.16741 2018 2 23 58172 -0.0072 0.3274 0.16619 2018 2 24 58173 -0.0077 0.3293 0.16505 2018 2 25 58174 -0.0081 0.3312 0.16399 2018 2 26 58175 -0.0086 0.3332 0.16297 2018 2 27 58176 -0.0089 0.3351 0.16191 2018 2 28 58177 -0.0093 0.3371 0.16074 2018 3 1 58178 -0.0096 0.3390 0.15943 2018 3 2 58179 -0.0099 0.3410 0.15797 2018 3 3 58180 -0.0101 0.3430 0.15641 2018 3 4 58181 -0.0103 0.3449 0.15482 2018 3 5 58182 -0.0105 0.3469 0.15327 2018 3 6 58183 -0.0106 0.3489 0.15183 2018 3 7 58184 -0.0107 0.3509 0.15051 2018 3 8 58185 -0.0108 0.3529 0.14935 2018 3 9 58186 -0.0108 0.3549 0.14831 2018 3 10 58187 -0.0108 0.3569 0.14737 2018 3 11 58188 -0.0107 0.3589 0.14649 2018 3 12 58189 -0.0107 0.3609 0.14563 2018 3 13 58190 -0.0105 0.3628 0.14474 2018 3 14 58191 -0.0104 0.3648 0.14377 2018 3 15 58192 -0.0102 0.3668 0.14268 2018 3 16 58193 -0.0100 0.3688 0.14145 2018 3 17 58194 -0.0097 0.3708 0.14008 2018 3 18 58195 -0.0094 0.3728 0.13857 2018 3 19 58196 -0.0091 0.3748 0.13697 2018 3 20 58197 -0.0087 0.3768 0.13533 2018 3 21 58198 -0.0083 0.3787 0.13373 2018 3 22 58199 -0.0079 0.3807 0.13221 2018 3 23 58200 -0.0074 0.3827 0.13079 2018 3 24 58201 -0.0069 0.3846 0.12946 2018 3 25 58202 -0.0064 0.3866 0.12819 2018 3 26 58203 -0.0058 0.3885 0.12691 2018 3 27 58204 -0.0052 0.3904 0.12555 2018 3 28 58205 -0.0045 0.3924 0.12407 2018 3 29 58206 -0.0039 0.3943 0.12244 2018 3 30 58207 -0.0032 0.3962 0.12068 2018 3 31 58208 -0.0024 0.3981 0.11884 2018 4 1 58209 -0.0016 0.4000 0.11702 2018 4 2 58210 -0.0008 0.4018 0.11527 2018 4 3 58211 0.0000 0.4037 0.11364 2018 4 4 58212 0.0009 0.4056 0.11215 2018 4 5 58213 0.0018 0.4074 0.11081 2018 4 6 58214 0.0028 0.4092 0.10958 2018 4 7 58215 0.0037 0.4110 0.10845 2018 4 8 58216 0.0047 0.4128 0.10736 2018 4 9 58217 0.0058 0.4146 0.10626 2018 4 10 58218 0.0069 0.4164 0.10511 2018 4 11 58219 0.0080 0.4182 0.10387 2018 4 12 58220 0.0091 0.4199 0.10250 2018 4 13 58221 0.0102 0.4216 0.10098 2018 4 14 58222 0.0114 0.4233 0.09934 2018 4 15 58223 0.0127 0.4250 0.09759 2018 4 16 58224 0.0139 0.4267 0.09585 2018 4 17 58225 0.0152 0.4283 0.09414 2018 4 18 58226 0.0165 0.4300 0.09252 2018 4 19 58227 0.0178 0.4316 0.09103 2018 4 20 58228 0.0192 0.4332 0.08967 2018 4 21 58229 0.0206 0.4348 0.08842 2018 4 22 58230 0.0220 0.4363 0.08720 2018 4 23 58231 0.0235 0.4379 0.08596 2018 4 24 58232 0.0249 0.4394 0.08464 2018 4 25 58233 0.0264 0.4409 0.08321 2018 4 26 58234 0.0280 0.4423 0.08166 2018 4 27 58235 0.0295 0.4438 0.08004 2018 4 28 58236 0.0311 0.4452 0.07841 2018 4 29 58237 0.0327 0.4466 0.07684 2018 4 30 58238 0.0343 0.4480 0.07538 2018 5 1 58239 0.0360 0.4493 0.07406 2018 5 2 58240 0.0377 0.4507 0.07290 2018 5 3 58241 0.0394 0.4520 0.07189 2018 5 4 58242 0.0411 0.4533 0.07100 2018 5 5 58243 0.0428 0.4545 0.07019 2018 5 6 58244 0.0446 0.4558 0.06941 2018 5 7 58245 0.0464 0.4570 0.06860 2018 5 8 58246 0.0482 0.4581 0.06773 2018 5 9 58247 0.0500 0.4593 0.06677 2018 5 10 58248 0.0518 0.4604 0.06568 2018 5 11 58249 0.0537 0.4615 0.06446 2018 5 12 58250 0.0556 0.4626 0.06313 2018 5 13 58251 0.0575 0.4636 0.06173 2018 5 14 58252 0.0594 0.4646 0.06031 2018 5 15 58253 0.0613 0.4656 0.05896 2018 5 16 58254 0.0633 0.4666 0.05773 2018 5 17 58255 0.0652 0.4675 0.05665 2018 5 18 58256 0.0672 0.4684 0.05570 2018 5 19 58257 0.0692 0.4693 0.05484 2018 5 20 58258 0.0712 0.4701 0.05397 2018 5 21 58259 0.0732 0.4709 0.05305 2018 5 22 58260 0.0753 0.4717 0.05204 2018 5 23 58261 0.0773 0.4725 0.05093 2018 5 24 58262 0.0794 0.4732 0.04977 2018 5 25 58263 0.0815 0.4739 0.04860 2018 5 26 58264 0.0835 0.4745 0.04747 2018 5 27 58265 0.0856 0.4752 0.04645 2018 5 28 58266 0.0877 0.4758 0.04557 2018 5 29 58267 0.0899 0.4763 0.04484 2018 5 30 58268 0.0920 0.4769 0.04427 2018 5 31 58269 0.0941 0.4774 0.04383 2018 6 1 58270 0.0962 0.4778 0.04349 2018 6 2 58271 0.0984 0.4783 0.04320 2018 6 3 58272 0.1005 0.4787 0.04292 2018 6 4 58273 0.1027 0.4790 0.04259 2018 6 5 58274 0.1048 0.4794 0.04217 2018 6 6 58275 0.1070 0.4797 0.04166 2018 6 7 58276 0.1092 0.4800 0.04102 2018 6 8 58277 0.1114 0.4802 0.04028 2018 6 9 58278 0.1135 0.4804 0.03945 2018 6 10 58279 0.1157 0.4806 0.03857 2018 6 11 58280 0.1179 0.4808 0.03770 2018 6 12 58281 0.1201 0.4809 0.03693 2018 6 13 58282 0.1222 0.4810 0.03628 2018 6 14 58283 0.1244 0.4810 0.03577 2018 6 15 58284 0.1266 0.4810 0.03535 2018 6 16 58285 0.1288 0.4810 0.03496 2018 6 17 58286 0.1310 0.4810 0.03453 2018 6 18 58287 0.1331 0.4809 0.03400 2018 6 19 58288 0.1353 0.4808 0.03337 2018 6 20 58289 0.1375 0.4806 0.03268 2018 6 21 58290 0.1396 0.4804 0.03199 2018 6 22 58291 0.1418 0.4802 0.03135 2018 6 23 58292 0.1439 0.4800 0.03082 2018 6 24 58293 0.1461 0.4797 0.03044 2018 6 25 58294 0.1482 0.4794 0.03023 2018 6 26 58295 0.1504 0.4791 0.03018 2018 6 27 58296 0.1525 0.4787 0.03029 2018 6 28 58297 0.1546 0.4783 0.03052 2018 6 29 58298 0.1567 0.4779 0.03083 2018 6 30 58299 0.1588 0.4774 0.03118 2018 7 1 58300 0.1609 0.4769 0.03153 2018 7 2 58301 0.1630 0.4764 0.03182 2018 7 3 58302 0.1650 0.4758 0.03203 2018 7 4 58303 0.1671 0.4752 0.03214 2018 7 5 58304 0.1691 0.4746 0.03214 2018 7 6 58305 0.1712 0.4740 0.03201 2018 7 7 58306 0.1732 0.4733 0.03178 2018 7 8 58307 0.1752 0.4726 0.03147 2018 7 9 58308 0.1772 0.4718 0.03113 2018 7 10 58309 0.1791 0.4711 0.03081 2018 7 11 58310 0.1811 0.4702 0.03053 2018 7 12 58311 0.1830 0.4694 0.03031 2018 7 13 58312 0.1849 0.4686 0.03009 2018 7 14 58313 0.1868 0.4677 0.02980 2018 7 15 58314 0.1887 0.4668 0.02940 2018 7 16 58315 0.1906 0.4658 0.02886 2018 7 17 58316 0.1925 0.4648 0.02821 2018 7 18 58317 0.1943 0.4638 0.02752 2018 7 19 58318 0.1961 0.4628 0.02687 2018 7 20 58319 0.1979 0.4617 0.02632 2018 7 21 58320 0.1997 0.4607 0.02593 2018 7 22 58321 0.2014 0.4596 0.02570 2018 7 23 58322 0.2032 0.4584 0.02562 2018 7 24 58323 0.2049 0.4573 0.02568 2018 7 25 58324 0.2065 0.4561 0.02584 2018 7 26 58325 0.2082 0.4549 0.02604 2018 7 27 58326 0.2098 0.4536 0.02624 2018 7 28 58327 0.2115 0.4524 0.02638 2018 7 29 58328 0.2131 0.4511 0.02641 2018 7 30 58329 0.2146 0.4498 0.02629 2018 7 31 58330 0.2162 0.4484 0.02602 2018 8 1 58331 0.2177 0.4471 0.02559 2018 8 2 58332 0.2192 0.4457 0.02503 2018 8 3 58333 0.2206 0.4443 0.02438 2018 8 4 58334 0.2221 0.4429 0.02366 2018 8 5 58335 0.2235 0.4414 0.02291 2018 8 6 58336 0.2249 0.4399 0.02216 2018 8 7 58337 0.2262 0.4385 0.02146 2018 8 8 58338 0.2275 0.4369 0.02083 2018 8 9 58339 0.2288 0.4354 0.02022 2018 8 10 58340 0.2301 0.4339 0.01954 2018 8 11 58341 0.2314 0.4323 0.01874 2018 8 12 58342 0.2326 0.4307 0.01780 2018 8 13 58343 0.2337 0.4291 0.01675 2018 8 14 58344 0.2349 0.4275 0.01564 2018 8 15 58345 0.2360 0.4259 0.01458 2018 8 16 58346 0.2371 0.4242 0.01359 2018 8 17 58347 0.2382 0.4225 0.01265 2018 8 18 58348 0.2392 0.4208 0.01184 2018 8 19 58349 0.2402 0.4191 0.01119 2018 8 20 58350 0.2412 0.4174 0.01070 2018 8 21 58351 0.2421 0.4157 0.01037 2018 8 22 58352 0.2430 0.4139 0.01012 2018 8 23 58353 0.2439 0.4122 0.00990 2018 8 24 58354 0.2447 0.4104 0.00962 2018 8 25 58355 0.2455 0.4086 0.00920 2018 8 26 58356 0.2463 0.4068 0.00862 2018 8 27 58357 0.2470 0.4050 0.00787 2018 8 28 58358 0.2477 0.4032 0.00707 2018 8 29 58359 0.2484 0.4014 0.00614 2018 8 30 58360 0.2490 0.3995 0.00510 2018 8 31 58361 0.2496 0.3977 0.00405 2018 9 1 58362 0.2502 0.3958 0.00303 2018 9 2 58363 0.2507 0.3940 0.00209 2018 9 3 58364 0.2512 0.3921 0.00127 2018 9 4 58365 0.2517 0.3902 0.00057 2018 9 5 58366 0.2521 0.3883 -0.00019 2018 9 6 58367 0.2525 0.3864 -0.00100 2018 9 7 58368 0.2529 0.3845 -0.00185 2018 9 8 58369 0.2532 0.3826 -0.00278 2018 9 9 58370 0.2535 0.3807 -0.00389 2018 9 10 58371 0.2538 0.3788 -0.00519 2018 9 11 58372 0.2540 0.3769 -0.00661 2018 9 12 58373 0.2542 0.3750 -0.00800 2018 9 13 58374 0.2544 0.3730 -0.00929 2018 9 14 58375 0.2545 0.3711 -0.01048 2018 9 15 58376 0.2546 0.3692 -0.01154 2018 9 16 58377 0.2546 0.3673 -0.01256 2018 9 17 58378 0.2546 0.3653 -0.01345 2018 9 18 58379 0.2546 0.3634 -0.01428 2018 9 19 58380 0.2546 0.3615 -0.01508 2018 9 20 58381 0.2545 0.3595 -0.01589 2018 9 21 58382 0.2544 0.3576 -0.01675 2018 9 22 58383 0.2542 0.3557 -0.01770 2018 9 23 58384 0.2540 0.3538 -0.01887 2018 9 24 58385 0.2538 0.3519 -0.02021 2018 9 25 58386 0.2535 0.3499 -0.02169 2018 9 26 58387 0.2532 0.3480 -0.02322 2018 9 27 58388 0.2529 0.3461 -0.02472 2018 9 28 58389 0.2525 0.3442 -0.02619 2018 9 29 58390 0.2521 0.3423 -0.02756 2018 9 30 58391 0.2517 0.3405 -0.02875 2018 10 1 58392 0.2512 0.3386 -0.02974 2018 10 2 58393 0.2507 0.3367 -0.03062 2018 10 3 58394 0.2502 0.3348 -0.03152 2018 10 4 58395 0.2497 0.3330 -0.03251 2018 10 5 58396 0.2491 0.3311 -0.03362 2018 10 6 58397 0.2484 0.3293 -0.03488 2018 10 7 58398 0.2478 0.3275 -0.03626 2018 10 8 58399 0.2471 0.3257 -0.03779 2018 10 9 58400 0.2463 0.3238 -0.03935 2018 10 10 58401 0.2456 0.3221 -0.04092 2018 10 11 58402 0.2448 0.3203 -0.04239 2018 10 12 58403 0.2440 0.3185 -0.04367 2018 10 13 58404 0.2431 0.3167 -0.04479 2018 10 14 58405 0.2422 0.3150 -0.04578 2018 10 15 58406 0.2413 0.3133 -0.04664 2018 10 16 58407 0.2404 0.3116 -0.04741 2018 10 17 58408 0.2394 0.3098 -0.04823 2018 10 18 58409 0.2384 0.3082 -0.04911 2018 10 19 58410 0.2374 0.3065 -0.05007 2018 10 20 58411 0.2363 0.3048 -0.05122 2018 10 21 58412 0.2352 0.3032 -0.05247 2018 10 22 58413 0.2341 0.3016 -0.05382 2018 10 23 58414 0.2330 0.3000 -0.05526 2018 10 24 58415 0.2318 0.2984 -0.05672 2018 10 25 58416 0.2306 0.2968 -0.05818 2018 10 26 58417 0.2294 0.2953 -0.05959 2018 10 27 58418 0.2281 0.2937 -0.06090 2018 10 28 58419 0.2268 0.2922 -0.06214 2018 10 29 58420 0.2255 0.2907 -0.06334 2018 10 30 58421 0.2242 0.2893 -0.06449 2018 10 31 58422 0.2229 0.2878 -0.06560 2018 11 1 58423 0.2215 0.2864 -0.06676 2018 11 2 58424 0.2201 0.2850 -0.06806 2018 11 3 58425 0.2186 0.2836 -0.06954 2018 11 4 58426 0.2172 0.2822 -0.07116 2018 11 5 58427 0.2157 0.2809 -0.07283 2018 11 6 58428 0.2142 0.2796 -0.07444 2018 11 7 58429 0.2127 0.2783 -0.07597 2018 11 8 58430 0.2112 0.2770 -0.07731 2018 11 9 58431 0.2096 0.2758 -0.07843 2018 11 10 58432 0.2080 0.2745 -0.07935 2018 11 11 58433 0.2064 0.2733 -0.08017 2018 11 12 58434 0.2048 0.2722 -0.08090 2018 11 13 58435 0.2032 0.2710 -0.08156 2018 11 14 58436 0.2015 0.2699 -0.08223 2018 11 15 58437 0.1998 0.2688 -0.08301 2018 11 16 58438 0.1981 0.2677 -0.08393 2018 11 17 58439 0.1964 0.2667 -0.08504 2018 11 18 58440 0.1947 0.2657 -0.08626 2018 11 19 58441 0.1930 0.2647 -0.08761 2018 11 20 58442 0.1912 0.2637 -0.08907 2018 11 21 58443 0.1894 0.2628 -0.09060 2018 11 22 58444 0.1876 0.2619 -0.09215 2018 11 23 58445 0.1858 0.2610 -0.09374 2018 11 24 58446 0.1840 0.2601 -0.09525 2018 11 25 58447 0.1822 0.2593 -0.09666 2018 11 26 58448 0.1803 0.2585 -0.09797 2018 11 27 58449 0.1785 0.2577 -0.09926 2018 11 28 58450 0.1766 0.2570 -0.10059 2018 11 29 58451 0.1747 0.2563 -0.10201 2018 11 30 58452 0.1729 0.2556 -0.10352 2018 12 1 58453 0.1710 0.2549 -0.10512 2018 12 2 58454 0.1691 0.2543 -0.10676 2018 12 3 58455 0.1671 0.2537 -0.10838 2018 12 4 58456 0.1652 0.2532 -0.10992 2018 12 5 58457 0.1633 0.2526 -0.11129 2018 12 6 58458 0.1613 0.2521 -0.11246 2018 12 7 58459 0.1594 0.2516 -0.11345 2018 12 8 58460 0.1575 0.2512 -0.11427 2018 12 9 58461 0.1555 0.2508 -0.11497 2018 12 10 58462 0.1535 0.2504 -0.11561 2018 12 11 58463 0.1516 0.2500 -0.11625 2018 12 12 58464 0.1496 0.2497 -0.11696 2018 12 13 58465 0.1476 0.2494 -0.11775 2018 12 14 58466 0.1457 0.2492 -0.11867 2018 12 15 58467 0.1437 0.2489 -0.11971 2018 12 16 58468 0.1417 0.2487 -0.12090 2018 12 17 58469 0.1397 0.2485 -0.12218 2018 12 18 58470 0.1378 0.2484 -0.12354 2018 12 19 58471 0.1358 0.2483 -0.12492 2018 12 20 58472 0.1338 0.2482 -0.12626 2018 12 21 58473 0.1318 0.2482 -0.12745 2018 12 22 58474 0.1299 0.2481 -0.12849 2018 12 23 58475 0.1279 0.2482 -0.12945 2018 12 24 58476 0.1259 0.2482 -0.13040 2018 12 25 58477 0.1240 0.2483 -0.13147 2018 12 26 58478 0.1220 0.2484 -0.13269 2018 12 27 58479 0.1201 0.2485 -0.13407 2018 12 28 58480 0.1181 0.2487 -0.13556 These predictions are based on all announced leap seconds. The recommended software to predict celestial pole offsets can be found at and software for the calculation of the dX and dY components with respect to IAU2000A Nutation/Precession Theory can be found at the web site in Chapter 5 Section 5.5 of the IERS Conventions (2010).