********************************************************************** * * * I E R S B U L L E T I N - A * * * * Rapid Service/Prediction of Earth Orientation * ********************************************************************** 18 January 2018 Vol. XXXI No. 003 ______________________________________________________________________ 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 18 1 12 58130 0.04326 .00009 0.25978 .00009 0.208515 0.000012 18 1 13 58131 0.04143 .00009 0.26052 .00009 0.208267 0.000014 18 1 14 58132 0.03987 .00009 0.26085 .00009 0.208151 0.000010 18 1 15 58133 0.03868 .00009 0.26125 .00009 0.208074 0.000008 18 1 16 58134 0.03781 .00009 0.26203 .00009 0.208027 0.000009 18 1 17 58135 0.03706 .00009 0.26333 .00009 0.207954 0.000009 18 1 18 58136 0.03612 .00009 0.26494 .00009 0.207813 0.000055 _______________________________________________________________________ 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 = 0.1232 - 0.0662 cos A - 0.1192 sin A - 0.0235 cos C + 0.0200 sin C y = 0.3547 - 0.1101 cos A + 0.0571 sin A + 0.0200 cos C + 0.0235 sin C UT1-UTC = 0.2144 - 0.00098 (MJD - 58144) - (UT2-UT1) where A = 2*pi*(MJD-58136)/365.25 and C = 2*pi*(MJD-58136)/435. TAI-UTC(MJD 58137) = 37.0 The accuracy may be estimated from the expressions: S x,y = 0.00068 (MJD-58136)**0.80 S t = 0.00025 (MJD-58136)**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) 2018 1 19 58137 0.0349 0.2666 0.20758 2018 1 20 58138 0.0335 0.2683 0.20722 2018 1 21 58139 0.0320 0.2698 0.20671 2018 1 22 58140 0.0304 0.2711 0.20605 2018 1 23 58141 0.0289 0.2724 0.20528 2018 1 24 58142 0.0276 0.2738 0.20443 2018 1 25 58143 0.0263 0.2751 0.20355 2018 1 26 58144 0.0249 0.2766 0.20270 2018 1 27 58145 0.0236 0.2780 0.20192 2018 1 28 58146 0.0222 0.2794 0.20124 2018 1 29 58147 0.0209 0.2809 0.20065 2018 1 30 58148 0.0197 0.2823 0.20009 2018 1 31 58149 0.0185 0.2838 0.19949 2018 2 1 58150 0.0172 0.2853 0.19880 2018 2 2 58151 0.0160 0.2868 0.19798 2018 2 3 58152 0.0148 0.2883 0.19706 2018 2 4 58153 0.0136 0.2898 0.19611 2018 2 5 58154 0.0125 0.2913 0.19517 2018 2 6 58155 0.0115 0.2929 0.19427 2018 2 7 58156 0.0105 0.2945 0.19345 2018 2 8 58157 0.0095 0.2961 0.19273 2018 2 9 58158 0.0085 0.2977 0.19211 2018 2 10 58159 0.0075 0.2994 0.19157 2018 2 11 58160 0.0066 0.3011 0.19109 2018 2 12 58161 0.0057 0.3027 0.19063 2018 2 13 58162 0.0048 0.3044 0.19015 2018 2 14 58163 0.0040 0.3061 0.18961 2018 2 15 58164 0.0031 0.3078 0.18895 2018 2 16 58165 0.0024 0.3095 0.18816 2018 2 17 58166 0.0016 0.3113 0.18720 2018 2 18 58167 0.0009 0.3130 0.18608 2018 2 19 58168 0.0002 0.3148 0.18482 2018 2 20 58169 -0.0005 0.3166 0.18346 2018 2 21 58170 -0.0011 0.3184 0.18207 2018 2 22 58171 -0.0017 0.3201 0.18070 2018 2 23 58172 -0.0022 0.3219 0.17940 2018 2 24 58173 -0.0028 0.3238 0.17818 2018 2 25 58174 -0.0033 0.3256 0.17704 2018 2 26 58175 -0.0037 0.3274 0.17594 2018 2 27 58176 -0.0041 0.3292 0.17481 2018 2 28 58177 -0.0045 0.3311 0.17359 2018 3 1 58178 -0.0049 0.3329 0.17222 2018 3 2 58179 -0.0052 0.3348 0.17070 2018 3 3 58180 -0.0055 0.3366 0.16908 2018 3 4 58181 -0.0058 0.3385 0.16743 2018 3 5 58182 -0.0060 0.3404 0.16582 2018 3 6 58183 -0.0062 0.3422 0.16431 2018 3 7 58184 -0.0063 0.3441 0.16294 2018 3 8 58185 -0.0064 0.3460 0.16172 2018 3 9 58186 -0.0065 0.3479 0.16063 2018 3 10 58187 -0.0066 0.3498 0.15965 2018 3 11 58188 -0.0066 0.3517 0.15874 2018 3 12 58189 -0.0066 0.3535 0.15784 2018 3 13 58190 -0.0065 0.3554 0.15691 2018 3 14 58191 -0.0064 0.3573 0.15590 2018 3 15 58192 -0.0063 0.3592 0.15477 2018 3 16 58193 -0.0061 0.3611 0.15350 2018 3 17 58194 -0.0060 0.3630 0.15209 2018 3 18 58195 -0.0057 0.3649 0.15054 2018 3 19 58196 -0.0055 0.3667 0.14891 2018 3 20 58197 -0.0052 0.3686 0.14727 2018 3 21 58198 -0.0048 0.3705 0.14568 2018 3 22 58199 -0.0045 0.3724 0.14418 2018 3 23 58200 -0.0041 0.3742 0.14281 2018 3 24 58201 -0.0036 0.3761 0.14155 2018 3 25 58202 -0.0032 0.3779 0.14036 2018 3 26 58203 -0.0027 0.3798 0.13918 2018 3 27 58204 -0.0021 0.3816 0.13793 2018 3 28 58205 -0.0016 0.3835 0.13656 2018 3 29 58206 -0.0010 0.3853 0.13505 2018 3 30 58207 -0.0003 0.3871 0.13341 2018 3 31 58208 0.0003 0.3889 0.13172 2018 4 1 58209 0.0010 0.3907 0.13003 2018 4 2 58210 0.0017 0.3925 0.12841 2018 4 3 58211 0.0025 0.3943 0.12692 2018 4 4 58212 0.0033 0.3960 0.12559 2018 4 5 58213 0.0041 0.3978 0.12440 2018 4 6 58214 0.0050 0.3995 0.12334 2018 4 7 58215 0.0059 0.4013 0.12238 2018 4 8 58216 0.0068 0.4030 0.12146 2018 4 9 58217 0.0078 0.4047 0.12055 2018 4 10 58218 0.0087 0.4064 0.11958 2018 4 11 58219 0.0098 0.4081 0.11852 2018 4 12 58220 0.0108 0.4097 0.11734 2018 4 13 58221 0.0119 0.4114 0.11602 2018 4 14 58222 0.0130 0.4130 0.11456 2018 4 15 58223 0.0141 0.4146 0.11301 2018 4 16 58224 0.0153 0.4162 0.11140 2018 4 17 58225 0.0165 0.4178 0.10981 2018 4 18 58226 0.0177 0.4194 0.10832 2018 4 19 58227 0.0189 0.4209 0.10695 2018 4 20 58228 0.0202 0.4225 0.10571 2018 4 21 58229 0.0215 0.4240 0.10458 2018 4 22 58230 0.0228 0.4255 0.10347 2018 4 23 58231 0.0242 0.4270 0.10234 2018 4 24 58232 0.0256 0.4284 0.10111 2018 4 25 58233 0.0270 0.4298 0.09977 2018 4 26 58234 0.0284 0.4313 0.09830 2018 4 27 58235 0.0298 0.4326 0.09676 2018 4 28 58236 0.0313 0.4340 0.09520 2018 4 29 58237 0.0328 0.4354 0.09370 2018 4 30 58238 0.0344 0.4367 0.09230 2018 5 1 58239 0.0359 0.4380 0.09105 2018 5 2 58240 0.0375 0.4393 0.08995 2018 5 3 58241 0.0391 0.4405 0.08900 2018 5 4 58242 0.0407 0.4418 0.08816 2018 5 5 58243 0.0423 0.4430 0.08740 2018 5 6 58244 0.0440 0.4442 0.08666 2018 5 7 58245 0.0457 0.4453 0.08598 2018 5 8 58246 0.0474 0.4465 0.08523 2018 5 9 58247 0.0491 0.4476 0.08438 2018 5 10 58248 0.0508 0.4487 0.08341 2018 5 11 58249 0.0526 0.4497 0.08231 2018 5 12 58250 0.0544 0.4508 0.08109 2018 5 13 58251 0.0562 0.4518 0.07980 2018 5 14 58252 0.0580 0.4528 0.07849 2018 5 15 58253 0.0598 0.4537 0.07724 2018 5 16 58254 0.0617 0.4547 0.07611 2018 5 17 58255 0.0635 0.4556 0.07513 2018 5 18 58256 0.0654 0.4564 0.07429 2018 5 19 58257 0.0673 0.4573 0.07351 2018 5 20 58258 0.0692 0.4581 0.07274 2018 5 21 58259 0.0711 0.4589 0.07191 2018 5 22 58260 0.0730 0.4596 0.07099 2018 5 23 58261 0.0750 0.4604 0.06998 2018 5 24 58262 0.0769 0.4611 0.06890 2018 5 25 58263 0.0789 0.4618 0.06782 2018 5 26 58264 0.0809 0.4624 0.06678 2018 5 27 58265 0.0829 0.4630 0.06584 2018 5 28 58266 0.0848 0.4636 0.06505 2018 5 29 58267 0.0869 0.4642 0.06441 2018 5 30 58268 0.0889 0.4647 0.06393 2018 5 31 58269 0.0909 0.4652 0.06358 2018 6 1 58270 0.0929 0.4656 0.06332 2018 6 2 58271 0.0950 0.4661 0.06311 2018 6 3 58272 0.0970 0.4665 0.06291 2018 6 4 58273 0.0990 0.4669 0.06266 2018 6 5 58274 0.1011 0.4672 0.06233 2018 6 6 58275 0.1032 0.4675 0.06189 2018 6 7 58276 0.1052 0.4678 0.06134 2018 6 8 58277 0.1073 0.4681 0.06067 2018 6 9 58278 0.1094 0.4683 0.05990 2018 6 10 58279 0.1114 0.4685 0.05909 2018 6 11 58280 0.1135 0.4686 0.05830 2018 6 12 58281 0.1156 0.4688 0.05758 2018 6 13 58282 0.1176 0.4688 0.05700 2018 6 14 58283 0.1197 0.4689 0.05654 2018 6 15 58284 0.1218 0.4689 0.05619 2018 6 16 58285 0.1239 0.4690 0.05585 2018 6 17 58286 0.1259 0.4689 0.05546 2018 6 18 58287 0.1280 0.4689 0.05498 2018 6 19 58288 0.1301 0.4688 0.05440 2018 6 20 58289 0.1321 0.4687 0.05374 2018 6 21 58290 0.1342 0.4685 0.05308 2018 6 22 58291 0.1362 0.4683 0.05246 2018 6 23 58292 0.1383 0.4681 0.05194 2018 6 24 58293 0.1403 0.4679 0.05155 2018 6 25 58294 0.1424 0.4676 0.05132 2018 6 26 58295 0.1444 0.4673 0.05123 2018 6 27 58296 0.1464 0.4669 0.05128 2018 6 28 58297 0.1484 0.4666 0.05142 2018 6 29 58298 0.1504 0.4662 0.05162 2018 6 30 58299 0.1524 0.4658 0.05184 2018 7 1 58300 0.1544 0.4653 0.05201 2018 7 2 58301 0.1564 0.4648 0.05211 2018 7 3 58302 0.1584 0.4643 0.05211 2018 7 4 58303 0.1603 0.4638 0.05198 2018 7 5 58304 0.1623 0.4632 0.05175 2018 7 6 58305 0.1642 0.4626 0.05142 2018 7 7 58306 0.1661 0.4619 0.05103 2018 7 8 58307 0.1680 0.4613 0.05063 2018 7 9 58308 0.1699 0.4606 0.05026 2018 7 10 58309 0.1718 0.4599 0.04999 2018 7 11 58310 0.1736 0.4591 0.04983 2018 7 12 58311 0.1755 0.4583 0.04978 2018 7 13 58312 0.1773 0.4575 0.04977 2018 7 14 58313 0.1791 0.4567 0.04973 2018 7 15 58314 0.1809 0.4559 0.04959 2018 7 16 58315 0.1827 0.4550 0.04933 2018 7 17 58316 0.1845 0.4541 0.04898 2018 7 18 58317 0.1862 0.4531 0.04861 2018 7 19 58318 0.1879 0.4521 0.04831 2018 7 20 58319 0.1896 0.4512 0.04812 2018 7 21 58320 0.1913 0.4501 0.04812 2018 7 22 58321 0.1930 0.4491 0.04831 2018 7 23 58322 0.1946 0.4480 0.04870 2018 7 24 58323 0.1962 0.4469 0.04926 2018 7 25 58324 0.1978 0.4458 0.04995 2018 7 26 58325 0.1994 0.4447 0.05072 2018 7 27 58326 0.2010 0.4435 0.05149 2018 7 28 58327 0.2025 0.4423 0.05219 2018 7 29 58328 0.2040 0.4411 0.05274 2018 7 30 58329 0.2055 0.4399 0.05311 2018 7 31 58330 0.2069 0.4386 0.05326 2018 8 1 58331 0.2084 0.4374 0.05319 2018 8 2 58332 0.2098 0.4361 0.05293 2018 8 3 58333 0.2112 0.4347 0.05252 2018 8 4 58334 0.2125 0.4334 0.05202 2018 8 5 58335 0.2139 0.4320 0.05147 2018 8 6 58336 0.2152 0.4307 0.05095 2018 8 7 58337 0.2164 0.4292 0.05048 2018 8 8 58338 0.2177 0.4278 0.05009 2018 8 9 58339 0.2189 0.4264 0.04974 2018 8 10 58340 0.2201 0.4249 0.04935 2018 8 11 58341 0.2213 0.4235 0.04885 2018 8 12 58342 0.2224 0.4220 0.04817 2018 8 13 58343 0.2235 0.4204 0.04730 2018 8 14 58344 0.2246 0.4189 0.04629 2018 8 15 58345 0.2257 0.4174 0.04523 2018 8 16 58346 0.2267 0.4158 0.04423 2018 8 17 58347 0.2277 0.4142 0.04334 2018 8 18 58348 0.2286 0.4126 0.04263 2018 8 19 58349 0.2296 0.4110 0.04210 2018 8 20 58350 0.2305 0.4094 0.04172 2018 8 21 58351 0.2314 0.4078 0.04146 2018 8 22 58352 0.2322 0.4061 0.04126 2018 8 23 58353 0.2330 0.4045 0.04108 2018 8 24 58354 0.2338 0.4028 0.04088 2018 8 25 58355 0.2345 0.4011 0.04062 2018 8 26 58356 0.2352 0.3994 0.04023 2018 8 27 58357 0.2359 0.3977 0.03970 2018 8 28 58358 0.2366 0.3960 0.03904 2018 8 29 58359 0.2372 0.3943 0.03827 2018 8 30 58360 0.2378 0.3926 0.03745 2018 8 31 58361 0.2383 0.3908 0.03662 2018 9 1 58362 0.2389 0.3891 0.03579 2018 9 2 58363 0.2393 0.3873 0.03500 2018 9 3 58364 0.2398 0.3855 0.03426 2018 9 4 58365 0.2402 0.3838 0.03370 2018 9 5 58366 0.2406 0.3820 0.03314 2018 9 6 58367 0.2410 0.3802 0.03250 2018 9 7 58368 0.2413 0.3784 0.03175 2018 9 8 58369 0.2416 0.3766 0.03078 2018 9 9 58370 0.2418 0.3748 0.02959 2018 9 10 58371 0.2420 0.3730 0.02823 2018 9 11 58372 0.2422 0.3712 0.02674 2018 9 12 58373 0.2424 0.3694 0.02519 2018 9 13 58374 0.2425 0.3676 0.02374 2018 9 14 58375 0.2426 0.3658 0.02243 2018 9 15 58376 0.2426 0.3639 0.02123 2018 9 16 58377 0.2427 0.3621 0.02014 2018 9 17 58378 0.2426 0.3603 0.01910 2018 9 18 58379 0.2426 0.3585 0.01813 2018 9 19 58380 0.2425 0.3567 0.01717 2018 9 20 58381 0.2424 0.3549 0.01617 2018 9 21 58382 0.2423 0.3531 0.01505 2018 9 22 58383 0.2421 0.3512 0.01384 2018 9 23 58384 0.2419 0.3494 0.01251 2018 9 24 58385 0.2416 0.3476 0.01110 2018 9 25 58386 0.2413 0.3458 0.00961 2018 9 26 58387 0.2410 0.3440 0.00810 2018 9 27 58388 0.2407 0.3423 0.00655 2018 9 28 58389 0.2403 0.3405 0.00494 2018 9 29 58390 0.2399 0.3387 0.00338 2018 9 30 58391 0.2394 0.3369 0.00191 2018 10 1 58392 0.2390 0.3352 0.00056 2018 10 2 58393 0.2384 0.3334 -0.00067 2018 10 3 58394 0.2379 0.3316 -0.00185 2018 10 4 58395 0.2373 0.3299 -0.00307 2018 10 5 58396 0.2367 0.3282 -0.00444 2018 10 6 58397 0.2361 0.3265 -0.00604 2018 10 7 58398 0.2354 0.3247 -0.00788 2018 10 8 58399 0.2347 0.3230 -0.00988 2018 10 9 58400 0.2340 0.3213 -0.01185 2018 10 10 58401 0.2332 0.3197 -0.01377 2018 10 11 58402 0.2325 0.3180 -0.01561 2018 10 12 58403 0.2316 0.3163 -0.01725 2018 10 13 58404 0.2308 0.3147 -0.01869 2018 10 14 58405 0.2299 0.3131 -0.01996 2018 10 15 58406 0.2290 0.3114 -0.02106 2018 10 16 58407 0.2281 0.3098 -0.02207 2018 10 17 58408 0.2271 0.3082 -0.02317 2018 10 18 58409 0.2261 0.3067 -0.02434 2018 10 19 58410 0.2251 0.3051 -0.02555 2018 10 20 58411 0.2240 0.3036 -0.02680 2018 10 21 58412 0.2230 0.3020 -0.02816 2018 10 22 58413 0.2219 0.3005 -0.02968 2018 10 23 58414 0.2207 0.2990 -0.03132 2018 10 24 58415 0.2196 0.2976 -0.03300 2018 10 25 58416 0.2184 0.2961 -0.03469 2018 10 26 58417 0.2172 0.2947 -0.03635 2018 10 27 58418 0.2160 0.2932 -0.03796 2018 10 28 58419 0.2147 0.2918 -0.03954 2018 10 29 58420 0.2134 0.2905 -0.04101 2018 10 30 58421 0.2121 0.2891 -0.04244 2018 10 31 58422 0.2108 0.2877 -0.04389 2018 11 1 58423 0.2094 0.2864 -0.04541 2018 11 2 58424 0.2081 0.2851 -0.04706 2018 11 3 58425 0.2067 0.2838 -0.04883 2018 11 4 58426 0.2052 0.2826 -0.05082 2018 11 5 58427 0.2038 0.2813 -0.05292 2018 11 6 58428 0.2023 0.2801 -0.05501 2018 11 7 58429 0.2009 0.2789 -0.05695 2018 11 8 58430 0.1994 0.2778 -0.05868 2018 11 9 58431 0.1978 0.2766 -0.06020 2018 11 10 58432 0.1963 0.2755 -0.06151 2018 11 11 58433 0.1947 0.2744 -0.06260 2018 11 12 58434 0.1932 0.2733 -0.06349 2018 11 13 58435 0.1916 0.2723 -0.06429 2018 11 14 58436 0.1899 0.2712 -0.06515 2018 11 15 58437 0.1883 0.2702 -0.06608 2018 11 16 58438 0.1867 0.2693 -0.06711 2018 11 17 58439 0.1850 0.2683 -0.06823 2018 11 18 58440 0.1833 0.2674 -0.06940 2018 11 19 58441 0.1816 0.2665 -0.07070 2018 11 20 58442 0.1799 0.2656 -0.07207 2018 11 21 58443 0.1782 0.2647 -0.07351 2018 11 22 58444 0.1765 0.2639 -0.07495 2018 11 23 58445 0.1747 0.2631 -0.07628 2018 11 24 58446 0.1730 0.2624 -0.07749 2018 11 25 58447 0.1712 0.2616 -0.07859 2018 11 26 58448 0.1694 0.2609 -0.07959 2018 11 27 58449 0.1676 0.2602 -0.08055 2018 11 28 58450 0.1658 0.2596 -0.08161 2018 11 29 58451 0.1640 0.2589 -0.08280 2018 11 30 58452 0.1622 0.2583 -0.08412 2018 12 1 58453 0.1603 0.2578 -0.08562 2018 12 2 58454 0.1585 0.2572 -0.08716 2018 12 3 58455 0.1566 0.2567 -0.08866 2018 12 4 58456 0.1548 0.2562 -0.09007 2018 12 5 58457 0.1529 0.2557 -0.09131 2018 12 6 58458 0.1511 0.2553 -0.09238 2018 12 7 58459 0.1492 0.2549 -0.09327 2018 12 8 58460 0.1473 0.2545 -0.09403 2018 12 9 58461 0.1454 0.2542 -0.09474 2018 12 10 58462 0.1435 0.2539 -0.09544 2018 12 11 58463 0.1416 0.2536 -0.09614 2018 12 12 58464 0.1398 0.2533 -0.09682 2018 12 13 58465 0.1379 0.2531 -0.09754 2018 12 14 58466 0.1360 0.2529 -0.09836 2018 12 15 58467 0.1341 0.2527 -0.09933 2018 12 16 58468 0.1322 0.2526 -0.10041 2018 12 17 58469 0.1303 0.2525 -0.10156 2018 12 18 58470 0.1284 0.2524 -0.10271 2018 12 19 58471 0.1265 0.2523 -0.10388 2018 12 20 58472 0.1246 0.2523 -0.10496 2018 12 21 58473 0.1227 0.2523 -0.10589 2018 12 22 58474 0.1208 0.2524 -0.10668 2018 12 23 58475 0.1189 0.2524 -0.10740 2018 12 24 58476 0.1171 0.2525 -0.10809 2018 12 25 58477 0.1152 0.2526 -0.10880 2018 12 26 58478 0.1133 0.2528 -0.10962 2018 12 27 58479 0.1114 0.2530 -0.11062 2018 12 28 58480 0.1096 0.2532 -0.11181 2018 12 29 58481 0.1077 0.2534 -0.11314 2018 12 30 58482 0.1059 0.2537 -0.11446 2018 12 31 58483 0.1041 0.2540 -0.11572 2019 1 1 58484 0.1022 0.2543 -0.11689 2019 1 2 58485 0.1004 0.2547 -0.11794 2019 1 3 58486 0.0986 0.2550 -0.11887 2019 1 4 58487 0.0968 0.2554 -0.11979 2019 1 5 58488 0.0950 0.2559 -0.12064 2019 1 6 58489 0.0932 0.2563 -0.12146 2019 1 7 58490 0.0915 0.2568 -0.12226 2019 1 8 58491 0.0897 0.2573 -0.12308 2019 1 9 58492 0.0880 0.2579 -0.12395 2019 1 10 58493 0.0862 0.2585 -0.12491 2019 1 11 58494 0.0845 0.2591 -0.12593 2019 1 12 58495 0.0828 0.2597 -0.12704 2019 1 13 58496 0.0811 0.2603 -0.12821 2019 1 14 58497 0.0795 0.2610 -0.12943 2019 1 15 58498 0.0778 0.2617 -0.13068 2019 1 16 58499 0.0762 0.2624 -0.13186 2019 1 17 58500 0.0745 0.2632 -0.13295 2019 1 18 58501 0.0729 0.2640 -0.13393 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).