********************************************************************** * * * I E R S B U L L E T I N - A * * * * Rapid Service/Prediction of Earth Orientation * ********************************************************************** 24 August 2017 Vol. XXX No. 034 ______________________________________________________________________ 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 = +0.3 seconds beginning 29 Jun 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 8 18 57983 0.22636 .00009 0.38156 .00009 0.340734 0.000027 17 8 19 57984 0.22749 .00009 0.37980 .00009 0.340514 0.000023 17 8 20 57985 0.22859 .00009 0.37854 .00009 0.340287 0.000020 17 8 21 57986 0.22952 .00009 0.37728 .00009 0.339951 0.000017 17 8 22 57987 0.23021 .00009 0.37569 .00009 0.339495 0.000017 17 8 23 57988 0.23069 .00009 0.37383 .00009 0.338957 0.000013 17 8 24 57989 0.23107 .00009 0.37182 .00009 0.338407 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 = 0.1176 + 0.1438 cos A + 0.0252 sin A - 0.0369 cos C - 0.0090 sin C y = 0.3585 + 0.0289 cos A - 0.1281 sin A - 0.0090 cos C + 0.0369 sin C UT1-UTC = 0.3090 - 0.00111 (MJD - 57997) - (UT2-UT1) where A = 2*pi*(MJD-57989)/365.25 and C = 2*pi*(MJD-57989)/435. TAI-UTC(MJD 57990) = 37.0 The accuracy may be estimated from the expressions: S x,y = 0.00068 (MJD-57989)**0.80 S t = 0.00025 (MJD-57989)**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 8 25 57990 0.2314 0.3698 0.33789 2017 8 26 57991 0.2317 0.3679 0.33743 2017 8 27 57992 0.2320 0.3660 0.33707 2017 8 28 57993 0.2324 0.3643 0.33680 2017 8 29 57994 0.2326 0.3626 0.33664 2017 8 30 57995 0.2326 0.3610 0.33654 2017 8 31 57996 0.2327 0.3593 0.33649 2017 9 1 57997 0.2326 0.3576 0.33646 2017 9 2 57998 0.2325 0.3559 0.33640 2017 9 3 57999 0.2323 0.3543 0.33630 2017 9 4 58000 0.2320 0.3526 0.33610 2017 9 5 58001 0.2317 0.3508 0.33576 2017 9 6 58002 0.2314 0.3491 0.33523 2017 9 7 58003 0.2312 0.3475 0.33451 2017 9 8 58004 0.2309 0.3458 0.33364 2017 9 9 58005 0.2306 0.3442 0.33268 2017 9 10 58006 0.2302 0.3426 0.33170 2017 9 11 58007 0.2298 0.3410 0.33075 2017 9 12 58008 0.2293 0.3393 0.32986 2017 9 13 58009 0.2287 0.3377 0.32903 2017 9 14 58010 0.2282 0.3360 0.32825 2017 9 15 58011 0.2276 0.3344 0.32746 2017 9 16 58012 0.2270 0.3328 0.32660 2017 9 17 58013 0.2264 0.3312 0.32564 2017 9 18 58014 0.2257 0.3296 0.32452 2017 9 19 58015 0.2250 0.3280 0.32327 2017 9 20 58016 0.2242 0.3265 0.32191 2017 9 21 58017 0.2234 0.3249 0.32052 2017 9 22 58018 0.2226 0.3234 0.31915 2017 9 23 58019 0.2217 0.3218 0.31784 2017 9 24 58020 0.2208 0.3203 0.31664 2017 9 25 58021 0.2199 0.3188 0.31555 2017 9 26 58022 0.2190 0.3173 0.31455 2017 9 27 58023 0.2180 0.3158 0.31361 2017 9 28 58024 0.2170 0.3143 0.31271 2017 9 29 58025 0.2160 0.3129 0.31179 2017 9 30 58026 0.2149 0.3114 0.31083 2017 10 1 58027 0.2138 0.3100 0.30978 2017 10 2 58028 0.2127 0.3086 0.30859 2017 10 3 58029 0.2115 0.3072 0.30724 2017 10 4 58030 0.2103 0.3058 0.30573 2017 10 5 58031 0.2091 0.3044 0.30405 2017 10 6 58032 0.2079 0.3031 0.30228 2017 10 7 58033 0.2066 0.3018 0.30048 2017 10 8 58034 0.2053 0.3004 0.29873 2017 10 9 58035 0.2040 0.2991 0.29710 2017 10 10 58036 0.2027 0.2979 0.29560 2017 10 11 58037 0.2013 0.2966 0.29422 2017 10 12 58038 0.1999 0.2954 0.29289 2017 10 13 58039 0.1985 0.2941 0.29157 2017 10 14 58040 0.1971 0.2929 0.29017 2017 10 15 58041 0.1956 0.2917 0.28867 2017 10 16 58042 0.1941 0.2906 0.28706 2017 10 17 58043 0.1926 0.2894 0.28534 2017 10 18 58044 0.1911 0.2883 0.28357 2017 10 19 58045 0.1895 0.2872 0.28180 2017 10 20 58046 0.1879 0.2861 0.28008 2017 10 21 58047 0.1863 0.2851 0.27845 2017 10 22 58048 0.1847 0.2840 0.27694 2017 10 23 58049 0.1831 0.2830 0.27554 2017 10 24 58050 0.1814 0.2820 0.27424 2017 10 25 58051 0.1797 0.2811 0.27301 2017 10 26 58052 0.1780 0.2801 0.27182 2017 10 27 58053 0.1763 0.2792 0.27061 2017 10 28 58054 0.1746 0.2783 0.26934 2017 10 29 58055 0.1728 0.2775 0.26797 2017 10 30 58056 0.1710 0.2766 0.26646 2017 10 31 58057 0.1692 0.2758 0.26479 2017 11 1 58058 0.1674 0.2750 0.26297 2017 11 2 58059 0.1656 0.2742 0.26102 2017 11 3 58060 0.1638 0.2735 0.25900 2017 11 4 58061 0.1619 0.2728 0.25699 2017 11 5 58062 0.1601 0.2721 0.25506 2017 11 6 58063 0.1582 0.2714 0.25327 2017 11 7 58064 0.1563 0.2708 0.25163 2017 11 8 58065 0.1544 0.2702 0.25009 2017 11 9 58066 0.1525 0.2696 0.24859 2017 11 10 58067 0.1505 0.2690 0.24707 2017 11 11 58068 0.1486 0.2685 0.24548 2017 11 12 58069 0.1466 0.2680 0.24382 2017 11 13 58070 0.1447 0.2676 0.24210 2017 11 14 58071 0.1427 0.2671 0.24035 2017 11 15 58072 0.1407 0.2667 0.23861 2017 11 16 58073 0.1387 0.2663 0.23694 2017 11 17 58074 0.1367 0.2660 0.23537 2017 11 18 58075 0.1347 0.2656 0.23391 2017 11 19 58076 0.1327 0.2653 0.23259 2017 11 20 58077 0.1307 0.2651 0.23139 2017 11 21 58078 0.1286 0.2648 0.23029 2017 11 22 58079 0.1266 0.2646 0.22926 2017 11 23 58080 0.1246 0.2644 0.22825 2017 11 24 58081 0.1225 0.2643 0.22721 2017 11 25 58082 0.1205 0.2641 0.22611 2017 11 26 58083 0.1184 0.2640 0.22490 2017 11 27 58084 0.1164 0.2640 0.22356 2017 11 28 58085 0.1143 0.2639 0.22208 2017 11 29 58086 0.1123 0.2639 0.22047 2017 11 30 58087 0.1102 0.2640 0.21876 2017 12 1 58088 0.1082 0.2640 0.21702 2017 12 2 58089 0.1061 0.2641 0.21533 2017 12 3 58090 0.1040 0.2642 0.21375 2017 12 4 58091 0.1020 0.2644 0.21232 2017 12 5 58092 0.0999 0.2645 0.21102 2017 12 6 58093 0.0979 0.2647 0.20979 2017 12 7 58094 0.0958 0.2650 0.20856 2017 12 8 58095 0.0938 0.2652 0.20728 2017 12 9 58096 0.0917 0.2655 0.20593 2017 12 10 58097 0.0897 0.2659 0.20450 2017 12 11 58098 0.0877 0.2662 0.20302 2017 12 12 58099 0.0857 0.2666 0.20156 2017 12 13 58100 0.0836 0.2670 0.20014 2017 12 14 58101 0.0816 0.2675 0.19882 2017 12 15 58102 0.0796 0.2679 0.19762 2017 12 16 58103 0.0776 0.2684 0.19653 2017 12 17 58104 0.0756 0.2690 0.19556 2017 12 18 58105 0.0737 0.2695 0.19469 2017 12 19 58106 0.0717 0.2701 0.19389 2017 12 20 58107 0.0697 0.2707 0.19313 2017 12 21 58108 0.0678 0.2714 0.19234 2017 12 22 58109 0.0659 0.2721 0.19151 2017 12 23 58110 0.0639 0.2728 0.19057 2017 12 24 58111 0.0620 0.2735 0.18952 2017 12 25 58112 0.0601 0.2743 0.18833 2017 12 26 58113 0.0582 0.2751 0.18701 2017 12 27 58114 0.0564 0.2759 0.18559 2017 12 28 58115 0.0545 0.2767 0.18410 2017 12 29 58116 0.0527 0.2776 0.18260 2017 12 30 58117 0.0508 0.2785 0.18117 2017 12 31 58118 0.0490 0.2794 0.17983 2018 1 1 58119 0.0472 0.2804 0.17862 2018 1 2 58120 0.0455 0.2814 0.17747 2018 1 3 58121 0.0437 0.2824 0.17634 2018 1 4 58122 0.0420 0.2834 0.17516 2018 1 5 58123 0.0402 0.2845 0.17387 2018 1 6 58124 0.0385 0.2855 0.17250 2018 1 7 58125 0.0369 0.2867 0.17107 2018 1 8 58126 0.0352 0.2878 0.16963 2018 1 9 58127 0.0335 0.2890 0.16825 2018 1 10 58128 0.0319 0.2901 0.16696 2018 1 11 58129 0.0303 0.2914 0.16578 2018 1 12 58130 0.0287 0.2926 0.16474 2018 1 13 58131 0.0272 0.2938 0.16381 2018 1 14 58132 0.0257 0.2951 0.16298 2018 1 15 58133 0.0241 0.2964 0.16222 2018 1 16 58134 0.0227 0.2978 0.16150 2018 1 17 58135 0.0212 0.2991 0.16077 2018 1 18 58136 0.0198 0.3005 0.15999 2018 1 19 58137 0.0183 0.3019 0.15911 2018 1 20 58138 0.0170 0.3033 0.15812 2018 1 21 58139 0.0156 0.3047 0.15698 2018 1 22 58140 0.0143 0.3062 0.15572 2018 1 23 58141 0.0130 0.3077 0.15436 2018 1 24 58142 0.0117 0.3092 0.15292 2018 1 25 58143 0.0104 0.3107 0.15147 2018 1 26 58144 0.0092 0.3122 0.15005 2018 1 27 58145 0.0080 0.3138 0.14870 2018 1 28 58146 0.0068 0.3153 0.14744 2018 1 29 58147 0.0057 0.3169 0.14626 2018 1 30 58148 0.0046 0.3185 0.14509 2018 1 31 58149 0.0035 0.3202 0.14387 2018 2 1 58150 0.0024 0.3218 0.14253 2018 2 2 58151 0.0014 0.3235 0.14107 2018 2 3 58152 0.0004 0.3251 0.13949 2018 2 4 58153 -0.0006 0.3268 0.13787 2018 2 5 58154 -0.0015 0.3285 0.13627 2018 2 6 58155 -0.0024 0.3302 0.13475 2018 2 7 58156 -0.0033 0.3320 0.13335 2018 2 8 58157 -0.0041 0.3337 0.13207 2018 2 9 58158 -0.0049 0.3355 0.13092 2018 2 10 58159 -0.0057 0.3373 0.12988 2018 2 11 58160 -0.0064 0.3390 0.12892 2018 2 12 58161 -0.0071 0.3408 0.12800 2018 2 13 58162 -0.0078 0.3427 0.12707 2018 2 14 58163 -0.0085 0.3445 0.12609 2018 2 15 58164 -0.0091 0.3463 0.12502 2018 2 16 58165 -0.0096 0.3481 0.12382 2018 2 17 58166 -0.0102 0.3500 0.12247 2018 2 18 58167 -0.0107 0.3519 0.12098 2018 2 19 58168 -0.0112 0.3537 0.11938 2018 2 20 58169 -0.0116 0.3556 0.11770 2018 2 21 58170 -0.0120 0.3575 0.11600 2018 2 22 58171 -0.0124 0.3594 0.11433 2018 2 23 58172 -0.0127 0.3613 0.11273 2018 2 24 58173 -0.0130 0.3632 0.11122 2018 2 25 58174 -0.0133 0.3651 0.10979 2018 2 26 58175 -0.0135 0.3670 0.10840 2018 2 27 58176 -0.0137 0.3689 0.10699 2018 2 28 58177 -0.0139 0.3708 0.10549 2018 3 1 58178 -0.0140 0.3727 0.10388 2018 3 2 58179 -0.0141 0.3747 0.10216 2018 3 3 58180 -0.0142 0.3766 0.10038 2018 3 4 58181 -0.0142 0.3785 0.09861 2018 3 5 58182 -0.0142 0.3805 0.09692 2018 3 6 58183 -0.0141 0.3824 0.09537 2018 3 7 58184 -0.0141 0.3843 0.09397 2018 3 8 58185 -0.0139 0.3863 0.09273 2018 3 9 58186 -0.0138 0.3882 0.09163 2018 3 10 58187 -0.0136 0.3901 0.09062 2018 3 11 58188 -0.0134 0.3921 0.08968 2018 3 12 58189 -0.0131 0.3940 0.08874 2018 3 13 58190 -0.0128 0.3959 0.08776 2018 3 14 58191 -0.0125 0.3979 0.08669 2018 3 15 58192 -0.0121 0.3998 0.08548 2018 3 16 58193 -0.0117 0.4017 0.08410 2018 3 17 58194 -0.0113 0.4036 0.08252 2018 3 18 58195 -0.0108 0.4055 0.08077 2018 3 19 58196 -0.0103 0.4074 0.07888 2018 3 20 58197 -0.0098 0.4093 0.07692 2018 3 21 58198 -0.0092 0.4112 0.07497 2018 3 22 58199 -0.0086 0.4131 0.07309 2018 3 23 58200 -0.0080 0.4149 0.07134 2018 3 24 58201 -0.0073 0.4168 0.06972 2018 3 25 58202 -0.0066 0.4186 0.06819 2018 3 26 58203 -0.0059 0.4205 0.06669 2018 3 27 58204 -0.0051 0.4223 0.06515 2018 3 28 58205 -0.0043 0.4242 0.06352 2018 3 29 58206 -0.0034 0.4260 0.06178 2018 3 30 58207 -0.0026 0.4278 0.05994 2018 3 31 58208 -0.0017 0.4296 0.05806 2018 4 1 58209 -0.0007 0.4313 0.05619 2018 4 2 58210 0.0002 0.4331 0.05441 2018 4 3 58211 0.0012 0.4349 0.05275 2018 4 4 58212 0.0023 0.4366 0.05122 2018 4 5 58213 0.0033 0.4383 0.04983 2018 4 6 58214 0.0044 0.4400 0.04855 2018 4 7 58215 0.0056 0.4417 0.04737 2018 4 8 58216 0.0067 0.4434 0.04619 2018 4 9 58217 0.0079 0.4451 0.04501 2018 4 10 58218 0.0091 0.4467 0.04376 2018 4 11 58219 0.0104 0.4484 0.04239 2018 4 12 58220 0.0116 0.4500 0.04091 2018 4 13 58221 0.0129 0.4516 0.03932 2018 4 14 58222 0.0143 0.4531 0.03764 2018 4 15 58223 0.0156 0.4547 0.03583 2018 4 16 58224 0.0170 0.4562 0.03395 2018 4 17 58225 0.0184 0.4578 0.03202 2018 4 18 58226 0.0199 0.4593 0.03014 2018 4 19 58227 0.0213 0.4607 0.02839 2018 4 20 58228 0.0228 0.4622 0.02679 2018 4 21 58229 0.0244 0.4636 0.02529 2018 4 22 58230 0.0259 0.4651 0.02383 2018 4 23 58231 0.0275 0.4665 0.02236 2018 4 24 58232 0.0291 0.4678 0.02077 2018 4 25 58233 0.0307 0.4692 0.01907 2018 4 26 58234 0.0323 0.4705 0.01728 2018 4 27 58235 0.0340 0.4718 0.01543 2018 4 28 58236 0.0357 0.4731 0.01356 2018 4 29 58237 0.0374 0.4744 0.01172 2018 4 30 58238 0.0392 0.4756 0.01006 2018 5 1 58239 0.0409 0.4768 0.00856 2018 5 2 58240 0.0427 0.4780 0.00721 2018 5 3 58241 0.0445 0.4791 0.00604 2018 5 4 58242 0.0463 0.4803 0.00501 2018 5 5 58243 0.0481 0.4814 0.00402 2018 5 6 58244 0.0500 0.4825 0.00310 2018 5 7 58245 0.0519 0.4835 0.00216 2018 5 8 58246 0.0538 0.4845 0.00117 2018 5 9 58247 0.0557 0.4855 0.00008 2018 5 10 58248 0.0576 0.4865 -0.00113 2018 5 11 58249 0.0596 0.4875 -0.00248 2018 5 12 58250 0.0615 0.4884 -0.00393 2018 5 13 58251 0.0635 0.4893 -0.00544 2018 5 14 58252 0.0655 0.4901 -0.00694 2018 5 15 58253 0.0675 0.4910 -0.00839 2018 5 16 58254 0.0695 0.4918 -0.00972 2018 5 17 58255 0.0715 0.4925 -0.01094 2018 5 18 58256 0.0736 0.4933 -0.01207 2018 5 19 58257 0.0756 0.4940 -0.01311 2018 5 20 58258 0.0777 0.4947 -0.01408 2018 5 21 58259 0.0798 0.4954 -0.01511 2018 5 22 58260 0.0819 0.4960 -0.01627 2018 5 23 58261 0.0840 0.4966 -0.01754 2018 5 24 58262 0.0861 0.4971 -0.01890 2018 5 25 58263 0.0882 0.4977 -0.02027 2018 5 26 58264 0.0903 0.4982 -0.02158 2018 5 27 58265 0.0925 0.4987 -0.02278 2018 5 28 58266 0.0946 0.4991 -0.02385 2018 5 29 58267 0.0968 0.4995 -0.02482 2018 5 30 58268 0.0989 0.4999 -0.02568 2018 5 31 58269 0.1011 0.5002 -0.02640 2018 6 1 58270 0.1033 0.5006 -0.02707 2018 6 2 58271 0.1054 0.5009 -0.02771 2018 6 3 58272 0.1076 0.5011 -0.02832 2018 6 4 58273 0.1098 0.5013 -0.02894 2018 6 5 58274 0.1120 0.5015 -0.02961 2018 6 6 58275 0.1141 0.5017 -0.03037 2018 6 7 58276 0.1163 0.5018 -0.03125 2018 6 8 58277 0.1185 0.5019 -0.03224 2018 6 9 58278 0.1207 0.5020 -0.03330 2018 6 10 58279 0.1229 0.5020 -0.03435 2018 6 11 58280 0.1250 0.5020 -0.03535 2018 6 12 58281 0.1272 0.5020 -0.03625 2018 6 13 58282 0.1294 0.5019 -0.03695 2018 6 14 58283 0.1316 0.5018 -0.03749 2018 6 15 58284 0.1337 0.5017 -0.03789 2018 6 16 58285 0.1359 0.5016 -0.03826 2018 6 17 58286 0.1381 0.5014 -0.03868 2018 6 18 58287 0.1402 0.5012 -0.03926 2018 6 19 58288 0.1424 0.5009 -0.04003 2018 6 20 58289 0.1445 0.5006 -0.04091 2018 6 21 58290 0.1467 0.5003 -0.04185 2018 6 22 58291 0.1488 0.5000 -0.04277 2018 6 23 58292 0.1509 0.4996 -0.04359 2018 6 24 58293 0.1530 0.4992 -0.04429 2018 6 25 58294 0.1551 0.4988 -0.04486 2018 6 26 58295 0.1572 0.4983 -0.04530 2018 6 27 58296 0.1593 0.4978 -0.04560 2018 6 28 58297 0.1614 0.4973 -0.04575 2018 6 29 58298 0.1634 0.4967 -0.04579 2018 6 30 58299 0.1655 0.4961 -0.04580 2018 7 1 58300 0.1675 0.4955 -0.04583 2018 7 2 58301 0.1695 0.4949 -0.04591 2018 7 3 58302 0.1715 0.4942 -0.04607 2018 7 4 58303 0.1735 0.4935 -0.04634 2018 7 5 58304 0.1755 0.4927 -0.04671 2018 7 6 58305 0.1775 0.4920 -0.04712 2018 7 7 58306 0.1794 0.4912 -0.04755 2018 7 8 58307 0.1814 0.4904 -0.04801 2018 7 9 58308 0.1833 0.4895 -0.04846 2018 7 10 58309 0.1852 0.4886 -0.04884 2018 7 11 58310 0.1870 0.4877 -0.04916 2018 7 12 58311 0.1889 0.4868 -0.04943 2018 7 13 58312 0.1907 0.4858 -0.04965 2018 7 14 58313 0.1926 0.4848 -0.04990 2018 7 15 58314 0.1944 0.4838 -0.05030 2018 7 16 58315 0.1961 0.4828 -0.05084 2018 7 17 58316 0.1979 0.4817 -0.05149 2018 7 18 58317 0.1996 0.4806 -0.05221 2018 7 19 58318 0.2014 0.4795 -0.05290 2018 7 20 58319 0.2031 0.4783 -0.05349 2018 7 21 58320 0.2047 0.4772 -0.05391 2018 7 22 58321 0.2064 0.4760 -0.05415 2018 7 23 58322 0.2080 0.4748 -0.05425 2018 7 24 58323 0.2096 0.4735 -0.05419 2018 7 25 58324 0.2112 0.4722 -0.05400 2018 7 26 58325 0.2127 0.4710 -0.05374 2018 7 27 58326 0.2142 0.4696 -0.05349 2018 7 28 58327 0.2157 0.4683 -0.05329 2018 7 29 58328 0.2172 0.4669 -0.05319 2018 7 30 58329 0.2187 0.4656 -0.05319 2018 7 31 58330 0.2201 0.4642 -0.05330 2018 8 1 58331 0.2215 0.4627 -0.05357 2018 8 2 58332 0.2228 0.4613 -0.05400 2018 8 3 58333 0.2242 0.4598 -0.05452 2018 8 4 58334 0.2255 0.4584 -0.05512 2018 8 5 58335 0.2267 0.4569 -0.05567 2018 8 6 58336 0.2280 0.4553 -0.05613 2018 8 7 58337 0.2292 0.4538 -0.05654 2018 8 8 58338 0.2304 0.4522 -0.05689 2018 8 9 58339 0.2316 0.4507 -0.05716 2018 8 10 58340 0.2327 0.4491 -0.05748 2018 8 11 58341 0.2338 0.4475 -0.05790 2018 8 12 58342 0.2348 0.4458 -0.05847 2018 8 13 58343 0.2359 0.4442 -0.05919 2018 8 14 58344 0.2369 0.4425 -0.05998 2018 8 15 58345 0.2378 0.4409 -0.06076 2018 8 16 58346 0.2388 0.4392 -0.06146 2018 8 17 58347 0.2397 0.4375 -0.06206 2018 8 18 58348 0.2406 0.4358 -0.06254 2018 8 19 58349 0.2414 0.4340 -0.06287 2018 8 20 58350 0.2422 0.4323 -0.06304 2018 8 21 58351 0.2430 0.4305 -0.06320 2018 8 22 58352 0.2437 0.4288 -0.06338 2018 8 23 58353 0.2444 0.4270 -0.06357 2018 8 24 58354 0.2451 0.4252 -0.06379 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).