********************************************************************** * * * I E R S B U L L E T I N - A * * * * Rapid Service/Prediction of Earth Orientation * ********************************************************************** 27 April 2017 Vol. XXX No. 017 ______________________________________________________________________ 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 = +0.4 seconds beginning 30 Mar 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. * * * * From Tuesday, 2 May 2017 through Friday, 12 May 2017 the Naval * * Observatory will perform scheduled network maintenance. Network * * degradations or outages impacting our product delivery are possible * * but should be temporary in nature. Please see above for details on * * accessing the backup EO server in the event of an outage. * * * * 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 4 21 57864 0.02617 .00009 0.41294 .00009 0.440334 0.000011 17 4 22 57865 0.02777 .00009 0.41505 .00009 0.438620 0.000010 17 4 23 57866 0.02904 .00009 0.41750 .00009 0.436718 0.000011 17 4 24 57867 0.02981 .00009 0.41972 .00009 0.434640 0.000014 17 4 25 57868 0.03055 .00009 0.42161 .00009 0.432449 0.000015 17 4 26 57869 0.03143 .00009 0.42323 .00009 0.430261 0.000015 17 4 27 57870 0.03229 .00009 0.42460 .00009 0.428166 0.000017 _______________________________________________________________________ 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 = 0.1175 - 0.0432 cos A + 0.0790 sin A - 0.0419 cos C - 0.0204 sin C y = 0.3721 + 0.0718 cos A + 0.0428 sin A - 0.0204 cos C + 0.0419 sin C UT1-UTC = 0.4592 - 0.00116 (MJD - 57878) - (UT2-UT1) where A = 2*pi*(MJD-57870)/365.25 and C = 2*pi*(MJD-57870)/435. TAI-UTC(MJD 57871) = 37.0 The accuracy may be estimated from the expressions: S x,y = 0.00068 (MJD-57870)**0.80 S t = 0.00025 (MJD-57870)**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 4 28 57871 0.0332 0.4258 0.42628 2017 4 29 57872 0.0341 0.4269 0.42462 2017 4 30 57873 0.0351 0.4280 0.42315 2017 5 1 57874 0.0361 0.4291 0.42180 2017 5 2 57875 0.0373 0.4302 0.42051 2017 5 3 57876 0.0385 0.4312 0.41925 2017 5 4 57877 0.0399 0.4323 0.41799 2017 5 5 57878 0.0412 0.4333 0.41668 2017 5 6 57879 0.0426 0.4344 0.41534 2017 5 7 57880 0.0440 0.4355 0.41397 2017 5 8 57881 0.0453 0.4364 0.41259 2017 5 9 57882 0.0467 0.4373 0.41123 2017 5 10 57883 0.0481 0.4382 0.40991 2017 5 11 57884 0.0495 0.4392 0.40866 2017 5 12 57885 0.0510 0.4401 0.40750 2017 5 13 57886 0.0525 0.4410 0.40644 2017 5 14 57887 0.0539 0.4420 0.40545 2017 5 15 57888 0.0554 0.4428 0.40450 2017 5 16 57889 0.0568 0.4437 0.40357 2017 5 17 57890 0.0583 0.4444 0.40262 2017 5 18 57891 0.0598 0.4452 0.40164 2017 5 19 57892 0.0613 0.4459 0.40057 2017 5 20 57893 0.0628 0.4466 0.39938 2017 5 21 57894 0.0643 0.4473 0.39808 2017 5 22 57895 0.0658 0.4479 0.39668 2017 5 23 57896 0.0674 0.4485 0.39523 2017 5 24 57897 0.0689 0.4491 0.39381 2017 5 25 57898 0.0705 0.4497 0.39250 2017 5 26 57899 0.0721 0.4502 0.39136 2017 5 27 57900 0.0737 0.4507 0.39038 2017 5 28 57901 0.0753 0.4512 0.38953 2017 5 29 57902 0.0769 0.4517 0.38875 2017 5 30 57903 0.0786 0.4521 0.38798 2017 5 31 57904 0.0802 0.4525 0.38718 2017 6 1 57905 0.0819 0.4529 0.38634 2017 6 2 57906 0.0835 0.4533 0.38548 2017 6 3 57907 0.0852 0.4536 0.38463 2017 6 4 57908 0.0868 0.4539 0.38382 2017 6 5 57909 0.0885 0.4542 0.38308 2017 6 6 57910 0.0901 0.4545 0.38246 2017 6 7 57911 0.0918 0.4547 0.38196 2017 6 8 57912 0.0935 0.4549 0.38159 2017 6 9 57913 0.0951 0.4551 0.38134 2017 6 10 57914 0.0968 0.4552 0.38118 2017 6 11 57915 0.0985 0.4554 0.38109 2017 6 12 57916 0.1001 0.4555 0.38102 2017 6 13 57917 0.1018 0.4555 0.38092 2017 6 14 57918 0.1035 0.4556 0.38073 2017 6 15 57919 0.1052 0.4556 0.38043 2017 6 16 57920 0.1068 0.4556 0.38000 2017 6 17 57921 0.1085 0.4556 0.37943 2017 6 18 57922 0.1102 0.4555 0.37873 2017 6 19 57923 0.1119 0.4554 0.37795 2017 6 20 57924 0.1135 0.4553 0.37715 2017 6 21 57925 0.1152 0.4552 0.37640 2017 6 22 57926 0.1168 0.4550 0.37576 2017 6 23 57927 0.1185 0.4548 0.37526 2017 6 24 57928 0.1201 0.4546 0.37489 2017 6 25 57929 0.1218 0.4543 0.37458 2017 6 26 57930 0.1234 0.4541 0.37428 2017 6 27 57931 0.1250 0.4538 0.37393 2017 6 28 57932 0.1267 0.4535 0.37352 2017 6 29 57933 0.1283 0.4531 0.37305 2017 6 30 57934 0.1299 0.4527 0.37257 2017 7 1 57935 0.1315 0.4523 0.37211 2017 7 2 57936 0.1331 0.4519 0.37170 2017 7 3 57937 0.1347 0.4515 0.37138 2017 7 4 57938 0.1362 0.4510 0.37116 2017 7 5 57939 0.1378 0.4505 0.37105 2017 7 6 57940 0.1393 0.4500 0.37105 2017 7 7 57941 0.1409 0.4494 0.37114 2017 7 8 57942 0.1424 0.4489 0.37128 2017 7 9 57943 0.1439 0.4483 0.37144 2017 7 10 57944 0.1454 0.4476 0.37159 2017 7 11 57945 0.1469 0.4470 0.37166 2017 7 12 57946 0.1484 0.4463 0.37164 2017 7 13 57947 0.1498 0.4457 0.37148 2017 7 14 57948 0.1513 0.4449 0.37119 2017 7 15 57949 0.1527 0.4442 0.37077 2017 7 16 57950 0.1541 0.4434 0.37026 2017 7 17 57951 0.1555 0.4427 0.36971 2017 7 18 57952 0.1569 0.4419 0.36917 2017 7 19 57953 0.1583 0.4410 0.36870 2017 7 20 57954 0.1596 0.4402 0.36833 2017 7 21 57955 0.1610 0.4393 0.36805 2017 7 22 57956 0.1623 0.4384 0.36784 2017 7 23 57957 0.1636 0.4375 0.36762 2017 7 24 57958 0.1649 0.4366 0.36735 2017 7 25 57959 0.1661 0.4356 0.36698 2017 7 26 57960 0.1674 0.4347 0.36652 2017 7 27 57961 0.1686 0.4337 0.36600 2017 7 28 57962 0.1698 0.4327 0.36548 2017 7 29 57963 0.1710 0.4317 0.36500 2017 7 30 57964 0.1721 0.4306 0.36459 2017 7 31 57965 0.1733 0.4295 0.36428 2017 8 1 57966 0.1744 0.4285 0.36407 2017 8 2 57967 0.1755 0.4274 0.36396 2017 8 3 57968 0.1766 0.4262 0.36393 2017 8 4 57969 0.1776 0.4251 0.36395 2017 8 5 57970 0.1787 0.4239 0.36399 2017 8 6 57971 0.1797 0.4228 0.36400 2017 8 7 57972 0.1807 0.4216 0.36395 2017 8 8 57973 0.1816 0.4204 0.36378 2017 8 9 57974 0.1826 0.4192 0.36347 2017 8 10 57975 0.1835 0.4179 0.36301 2017 8 11 57976 0.1844 0.4167 0.36241 2017 8 12 57977 0.1853 0.4154 0.36170 2017 8 13 57978 0.1861 0.4142 0.36094 2017 8 14 57979 0.1869 0.4129 0.36022 2017 8 15 57980 0.1877 0.4116 0.35956 2017 8 16 57981 0.1885 0.4103 0.35898 2017 8 17 57982 0.1892 0.4089 0.35849 2017 8 18 57983 0.1900 0.4076 0.35807 2017 8 19 57984 0.1907 0.4062 0.35765 2017 8 20 57985 0.1913 0.4049 0.35717 2017 8 21 57986 0.1920 0.4035 0.35660 2017 8 22 57987 0.1926 0.4021 0.35590 2017 8 23 57988 0.1932 0.4007 0.35510 2017 8 24 57989 0.1937 0.3993 0.35425 2017 8 25 57990 0.1943 0.3979 0.35341 2017 8 26 57991 0.1948 0.3965 0.35261 2017 8 27 57992 0.1952 0.3951 0.35190 2017 8 28 57993 0.1957 0.3937 0.35129 2017 8 29 57994 0.1961 0.3922 0.35078 2017 8 30 57995 0.1965 0.3908 0.35037 2017 8 31 57996 0.1969 0.3893 0.35001 2017 9 1 57997 0.1972 0.3879 0.34968 2017 9 2 57998 0.1975 0.3864 0.34933 2017 9 3 57999 0.1978 0.3849 0.34891 2017 9 4 58000 0.1981 0.3835 0.34838 2017 9 5 58001 0.1983 0.3820 0.34771 2017 9 6 58002 0.1985 0.3805 0.34686 2017 9 7 58003 0.1987 0.3790 0.34585 2017 9 8 58004 0.1988 0.3775 0.34471 2017 9 9 58005 0.1989 0.3760 0.34350 2017 9 10 58006 0.1990 0.3745 0.34228 2017 9 11 58007 0.1991 0.3730 0.34112 2017 9 12 58008 0.1991 0.3715 0.34006 2017 9 13 58009 0.1991 0.3701 0.33910 2017 9 14 58010 0.1991 0.3686 0.33821 2017 9 15 58011 0.1990 0.3671 0.33736 2017 9 16 58012 0.1989 0.3656 0.33646 2017 9 17 58013 0.1988 0.3641 0.33548 2017 9 18 58014 0.1987 0.3626 0.33437 2017 9 19 58015 0.1985 0.3611 0.33315 2017 9 20 58016 0.1983 0.3596 0.33183 2017 9 21 58017 0.1981 0.3581 0.33048 2017 9 22 58018 0.1978 0.3566 0.32916 2017 9 23 58019 0.1976 0.3552 0.32790 2017 9 24 58020 0.1973 0.3537 0.32673 2017 9 25 58021 0.1969 0.3522 0.32568 2017 9 26 58022 0.1966 0.3508 0.32472 2017 9 27 58023 0.1962 0.3493 0.32385 2017 9 28 58024 0.1958 0.3479 0.32302 2017 9 29 58025 0.1953 0.3464 0.32218 2017 9 30 58026 0.1948 0.3450 0.32131 2017 10 1 58027 0.1943 0.3435 0.32033 2017 10 2 58028 0.1938 0.3421 0.31923 2017 10 3 58029 0.1933 0.3407 0.31796 2017 10 4 58030 0.1927 0.3393 0.31651 2017 10 5 58031 0.1921 0.3379 0.31491 2017 10 6 58032 0.1914 0.3365 0.31320 2017 10 7 58033 0.1908 0.3352 0.31145 2017 10 8 58034 0.1901 0.3338 0.30975 2017 10 9 58035 0.1894 0.3324 0.30816 2017 10 10 58036 0.1887 0.3311 0.30670 2017 10 11 58037 0.1879 0.3298 0.30535 2017 10 12 58038 0.1871 0.3284 0.30406 2017 10 13 58039 0.1863 0.3271 0.30278 2017 10 14 58040 0.1855 0.3258 0.30143 2017 10 15 58041 0.1846 0.3246 0.29999 2017 10 16 58042 0.1837 0.3233 0.29844 2017 10 17 58043 0.1828 0.3220 0.29680 2017 10 18 58044 0.1819 0.3208 0.29512 2017 10 19 58045 0.1810 0.3196 0.29344 2017 10 20 58046 0.1800 0.3184 0.29181 2017 10 21 58047 0.1790 0.3172 0.29028 2017 10 22 58048 0.1780 0.3160 0.28885 2017 10 23 58049 0.1770 0.3148 0.28754 2017 10 24 58050 0.1759 0.3137 0.28634 2017 10 25 58051 0.1748 0.3125 0.28520 2017 10 26 58052 0.1737 0.3114 0.28410 2017 10 27 58053 0.1726 0.3103 0.28298 2017 10 28 58054 0.1715 0.3092 0.28181 2017 10 29 58055 0.1703 0.3082 0.28052 2017 10 30 58056 0.1691 0.3071 0.27910 2017 10 31 58057 0.1679 0.3061 0.27751 2017 11 1 58058 0.1667 0.3051 0.27576 2017 11 2 58059 0.1655 0.3041 0.27386 2017 11 3 58060 0.1642 0.3032 0.27188 2017 11 4 58061 0.1629 0.3022 0.26988 2017 11 5 58062 0.1617 0.3013 0.26797 2017 11 6 58063 0.1604 0.3004 0.26618 2017 11 7 58064 0.1590 0.2995 0.26453 2017 11 8 58065 0.1577 0.2986 0.26298 2017 11 9 58066 0.1564 0.2978 0.26149 2017 11 10 58067 0.1550 0.2970 0.25997 2017 11 11 58068 0.1536 0.2962 0.25841 2017 11 12 58069 0.1522 0.2954 0.25677 2017 11 13 58070 0.1508 0.2946 0.25507 2017 11 14 58071 0.1494 0.2939 0.25334 2017 11 15 58072 0.1480 0.2932 0.25164 2017 11 16 58073 0.1465 0.2925 0.25001 2017 11 17 58074 0.1451 0.2918 0.24848 2017 11 18 58075 0.1436 0.2912 0.24708 2017 11 19 58076 0.1421 0.2906 0.24580 2017 11 20 58077 0.1406 0.2900 0.24463 2017 11 21 58078 0.1391 0.2894 0.24355 2017 11 22 58079 0.1376 0.2888 0.24252 2017 11 23 58080 0.1361 0.2883 0.24150 2017 11 24 58081 0.1346 0.2878 0.24045 2017 11 25 58082 0.1330 0.2873 0.23933 2017 11 26 58083 0.1315 0.2869 0.23812 2017 11 27 58084 0.1299 0.2865 0.23680 2017 11 28 58085 0.1284 0.2861 0.23536 2017 11 29 58086 0.1268 0.2857 0.23381 2017 11 30 58087 0.1252 0.2853 0.23217 2017 12 1 58088 0.1237 0.2850 0.23050 2017 12 2 58089 0.1221 0.2847 0.22886 2017 12 3 58090 0.1205 0.2844 0.22731 2017 12 4 58091 0.1189 0.2842 0.22591 2017 12 5 58092 0.1173 0.2839 0.22464 2017 12 6 58093 0.1157 0.2837 0.22341 2017 12 7 58094 0.1141 0.2835 0.22214 2017 12 8 58095 0.1125 0.2834 0.22079 2017 12 9 58096 0.1109 0.2833 0.21932 2017 12 10 58097 0.1093 0.2832 0.21783 2017 12 11 58098 0.1077 0.2831 0.21633 2017 12 12 58099 0.1061 0.2830 0.21481 2017 12 13 58100 0.1045 0.2830 0.21335 2017 12 14 58101 0.1029 0.2830 0.21201 2017 12 15 58102 0.1013 0.2830 0.21078 2017 12 16 58103 0.0997 0.2831 0.20970 2017 12 17 58104 0.0981 0.2832 0.20875 2017 12 18 58105 0.0965 0.2833 0.20791 2017 12 19 58106 0.0949 0.2834 0.20719 2017 12 20 58107 0.0933 0.2835 0.20655 2017 12 21 58108 0.0917 0.2837 0.20592 2017 12 22 58109 0.0902 0.2839 0.20520 2017 12 23 58110 0.0886 0.2841 0.20437 2017 12 24 58111 0.0870 0.2844 0.20340 2017 12 25 58112 0.0855 0.2847 0.20234 2017 12 26 58113 0.0839 0.2850 0.20105 2017 12 27 58114 0.0824 0.2853 0.19959 2017 12 28 58115 0.0808 0.2857 0.19806 2017 12 29 58116 0.0793 0.2860 0.19652 2017 12 30 58117 0.0778 0.2864 0.19499 2017 12 31 58118 0.0762 0.2869 0.19355 2018 1 1 58119 0.0747 0.2873 0.19223 2018 1 2 58120 0.0732 0.2878 0.19098 2018 1 3 58121 0.0718 0.2883 0.18977 2018 1 4 58122 0.0703 0.2888 0.18855 2018 1 5 58123 0.0688 0.2893 0.18728 2018 1 6 58124 0.0674 0.2899 0.18593 2018 1 7 58125 0.0659 0.2905 0.18451 2018 1 8 58126 0.0645 0.2911 0.18307 2018 1 9 58127 0.0631 0.2917 0.18169 2018 1 10 58128 0.0617 0.2924 0.18036 2018 1 11 58129 0.0603 0.2931 0.17908 2018 1 12 58130 0.0589 0.2938 0.17789 2018 1 13 58131 0.0576 0.2945 0.17682 2018 1 14 58132 0.0562 0.2952 0.17588 2018 1 15 58133 0.0549 0.2960 0.17503 2018 1 16 58134 0.0536 0.2968 0.17424 2018 1 17 58135 0.0523 0.2976 0.17345 2018 1 18 58136 0.0510 0.2984 0.17259 2018 1 19 58137 0.0497 0.2993 0.17161 2018 1 20 58138 0.0485 0.3002 0.17051 2018 1 21 58139 0.0473 0.3010 0.16931 2018 1 22 58140 0.0461 0.3020 0.16795 2018 1 23 58141 0.0449 0.3029 0.16650 2018 1 24 58142 0.0437 0.3038 0.16500 2018 1 25 58143 0.0425 0.3048 0.16346 2018 1 26 58144 0.0414 0.3058 0.16187 2018 1 27 58145 0.0403 0.3068 0.16029 2018 1 28 58146 0.0392 0.3078 0.15876 2018 1 29 58147 0.0381 0.3088 0.15728 2018 1 30 58148 0.0371 0.3099 0.15584 2018 1 31 58149 0.0360 0.3110 0.15437 2018 2 1 58150 0.0350 0.3121 0.15281 2018 2 2 58151 0.0340 0.3132 0.15111 2018 2 3 58152 0.0331 0.3143 0.14931 2018 2 4 58153 0.0321 0.3154 0.14746 2018 2 5 58154 0.0312 0.3166 0.14563 2018 2 6 58155 0.0303 0.3177 0.14394 2018 2 7 58156 0.0294 0.3189 0.14238 2018 2 8 58157 0.0286 0.3201 0.14096 2018 2 9 58158 0.0278 0.3213 0.13968 2018 2 10 58159 0.0269 0.3225 0.13857 2018 2 11 58160 0.0262 0.3238 0.13761 2018 2 12 58161 0.0254 0.3250 0.13674 2018 2 13 58162 0.0247 0.3263 0.13592 2018 2 14 58163 0.0240 0.3275 0.13508 2018 2 15 58164 0.0233 0.3288 0.13415 2018 2 16 58165 0.0226 0.3301 0.13302 2018 2 17 58166 0.0220 0.3314 0.13170 2018 2 18 58167 0.0214 0.3327 0.13022 2018 2 19 58168 0.0208 0.3340 0.12863 2018 2 20 58169 0.0203 0.3354 0.12698 2018 2 21 58170 0.0197 0.3367 0.12532 2018 2 22 58171 0.0192 0.3381 0.12370 2018 2 23 58172 0.0187 0.3394 0.12215 2018 2 24 58173 0.0183 0.3408 0.12065 2018 2 25 58174 0.0179 0.3421 0.11915 2018 2 26 58175 0.0175 0.3435 0.11767 2018 2 27 58176 0.0171 0.3449 0.11615 2018 2 28 58177 0.0168 0.3463 0.11448 2018 3 1 58178 0.0164 0.3477 0.11258 2018 3 2 58179 0.0162 0.3491 0.11056 2018 3 3 58180 0.0159 0.3505 0.10845 2018 3 4 58181 0.0157 0.3519 0.10631 2018 3 5 58182 0.0155 0.3533 0.10417 2018 3 6 58183 0.0153 0.3547 0.10208 2018 3 7 58184 0.0151 0.3562 0.10007 2018 3 8 58185 0.0150 0.3576 0.09815 2018 3 9 58186 0.0149 0.3590 0.09641 2018 3 10 58187 0.0148 0.3604 0.09483 2018 3 11 58188 0.0148 0.3618 0.09332 2018 3 12 58189 0.0148 0.3633 0.09184 2018 3 13 58190 0.0148 0.3647 0.09039 2018 3 14 58191 0.0148 0.3661 0.08890 2018 3 15 58192 0.0149 0.3676 0.08732 2018 3 16 58193 0.0150 0.3690 0.08565 2018 3 17 58194 0.0151 0.3704 0.08387 2018 3 18 58195 0.0153 0.3718 0.08196 2018 3 19 58196 0.0154 0.3732 0.08001 2018 3 20 58197 0.0156 0.3747 0.07805 2018 3 21 58198 0.0159 0.3761 0.07612 2018 3 22 58199 0.0161 0.3775 0.07428 2018 3 23 58200 0.0164 0.3789 0.07250 2018 3 24 58201 0.0167 0.3803 0.07086 2018 3 25 58202 0.0171 0.3817 0.06924 2018 3 26 58203 0.0174 0.3831 0.06759 2018 3 27 58204 0.0178 0.3845 0.06586 2018 3 28 58205 0.0182 0.3858 0.06396 2018 3 29 58206 0.0187 0.3872 0.06189 2018 3 30 58207 0.0192 0.3886 0.05968 2018 3 31 58208 0.0197 0.3899 0.05738 2018 4 1 58209 0.0202 0.3913 0.05502 2018 4 2 58210 0.0207 0.3926 0.05268 2018 4 3 58211 0.0213 0.3939 0.05044 2018 4 4 58212 0.0219 0.3953 0.04835 2018 4 5 58213 0.0225 0.3966 0.04639 2018 4 6 58214 0.0232 0.3979 0.04454 2018 4 7 58215 0.0238 0.3992 0.04274 2018 4 8 58216 0.0245 0.4005 0.04099 2018 4 9 58217 0.0253 0.4017 0.03925 2018 4 10 58218 0.0260 0.4030 0.03743 2018 4 11 58219 0.0268 0.4042 0.03549 2018 4 12 58220 0.0276 0.4055 0.03343 2018 4 13 58221 0.0284 0.4067 0.03121 2018 4 14 58222 0.0292 0.4079 0.02884 2018 4 15 58223 0.0301 0.4091 0.02630 2018 4 16 58224 0.0310 0.4103 0.02366 2018 4 17 58225 0.0319 0.4114 0.02101 2018 4 18 58226 0.0328 0.4126 0.01851 2018 4 19 58227 0.0338 0.4137 0.01623 2018 4 20 58228 0.0347 0.4149 0.01413 2018 4 21 58229 0.0357 0.4160 0.01217 2018 4 22 58230 0.0367 0.4171 0.01025 2018 4 23 58231 0.0378 0.4181 0.00829 2018 4 24 58232 0.0388 0.4192 0.00625 2018 4 25 58233 0.0399 0.4202 0.00414 2018 4 26 58234 0.0410 0.4213 0.00199 2018 4 27 58235 0.0421 0.4223 -0.00016 These predictions are based on all announced leap seconds. CELESTIAL POLE OFFSET SERIES: NEOS Celestial Pole Offset Series MJD dpsi error deps error (msec. of arc) 57844 -98.84 0.11 -12.65 0.03 57845 -98.97 0.11 -12.72 0.03 57846 -98.94 0.11 -12.66 0.03 57847 -98.81 0.30 -12.60 0.15 57848 -98.60 0.30 -12.58 0.02 57849 -98.31 0.30 -12.61 0.02 57850 -98.01 0.30 -12.65 0.02 IAU2000A Celestial Pole Offset Series MJD dX error dY error (msec. of arc) 57844 -0.112 0.044 -0.097 0.030 57845 -0.108 0.044 -0.113 0.030 57846 -0.115 0.044 -0.103 0.030 57847 -0.123 0.119 -0.086 0.150 57848 -0.135 0.119 -0.070 0.020 57849 -0.155 0.119 -0.073 0.020 57850 -0.177 0.119 -0.061 0.020 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).