********************************************************************** * * * I E R S B U L L E T I N - A * * * * Rapid Service/Prediction of Earth Orientation * ********************************************************************** 20 April 2017 Vol. XXX No. 016 ______________________________________________________________________ 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. * * * * Due to scheduled network maintenance, we anticipate intermittent * * outages of the primary EO server from May 1, 2017 through May 14, * * 2017. 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 14 57857 0.01622 .00009 0.39888 .00009 0.450700 0.000014 17 4 15 57858 0.01810 .00009 0.40111 .00009 0.449209 0.000012 17 4 16 57859 0.01969 .00009 0.40348 .00009 0.447783 0.000012 17 4 17 57860 0.02117 .00009 0.40573 .00009 0.446356 0.000012 17 4 18 57861 0.02262 .00009 0.40777 .00009 0.444896 0.000012 17 4 19 57862 0.02380 .00009 0.40969 .00009 0.443413 0.000012 17 4 20 57863 0.02469 .00009 0.41143 .00009 0.441900 0.000013 _______________________________________________________________________ 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 - 0.0518 cos A + 0.0710 sin A - 0.0417 cos C - 0.0232 sin C y = 0.3709 + 0.0641 cos A + 0.0500 sin A - 0.0232 cos C + 0.0417 sin C UT1-UTC = 0.4676 - 0.00116 (MJD - 57871) - (UT2-UT1) where A = 2*pi*(MJD-57863)/365.25 and C = 2*pi*(MJD-57863)/435. TAI-UTC(MJD 57864) = 37.0 The accuracy may be estimated from the expressions: S x,y = 0.00068 (MJD-57863)**0.80 S t = 0.00025 (MJD-57863)**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 21 57864 0.0255 0.4129 0.44034 2017 4 22 57865 0.0263 0.4143 0.43865 2017 4 23 57866 0.0272 0.4156 0.43681 2017 4 24 57867 0.0283 0.4168 0.43482 2017 4 25 57868 0.0294 0.4181 0.43276 2017 4 26 57869 0.0305 0.4193 0.43071 2017 4 27 57870 0.0316 0.4205 0.42876 2017 4 28 57871 0.0326 0.4218 0.42696 2017 4 29 57872 0.0337 0.4230 0.42533 2017 4 30 57873 0.0347 0.4241 0.42383 2017 5 1 57874 0.0358 0.4252 0.42238 2017 5 2 57875 0.0370 0.4263 0.42095 2017 5 3 57876 0.0383 0.4273 0.41947 2017 5 4 57877 0.0396 0.4284 0.41791 2017 5 5 57878 0.0410 0.4295 0.41631 2017 5 6 57879 0.0423 0.4305 0.41471 2017 5 7 57880 0.0437 0.4316 0.41316 2017 5 8 57881 0.0451 0.4326 0.41168 2017 5 9 57882 0.0465 0.4336 0.41030 2017 5 10 57883 0.0478 0.4346 0.40906 2017 5 11 57884 0.0491 0.4355 0.40796 2017 5 12 57885 0.0505 0.4364 0.40698 2017 5 13 57886 0.0519 0.4373 0.40613 2017 5 14 57887 0.0533 0.4381 0.40538 2017 5 15 57888 0.0547 0.4389 0.40469 2017 5 16 57889 0.0562 0.4397 0.40401 2017 5 17 57890 0.0576 0.4405 0.40329 2017 5 18 57891 0.0591 0.4412 0.40250 2017 5 19 57892 0.0605 0.4420 0.40159 2017 5 20 57893 0.0620 0.4427 0.40055 2017 5 21 57894 0.0635 0.4433 0.39937 2017 5 22 57895 0.0650 0.4440 0.39806 2017 5 23 57896 0.0665 0.4446 0.39670 2017 5 24 57897 0.0680 0.4452 0.39535 2017 5 25 57898 0.0696 0.4458 0.39412 2017 5 26 57899 0.0711 0.4463 0.39304 2017 5 27 57900 0.0727 0.4469 0.39214 2017 5 28 57901 0.0743 0.4474 0.39138 2017 5 29 57902 0.0759 0.4479 0.39068 2017 5 30 57903 0.0774 0.4483 0.39000 2017 5 31 57904 0.0790 0.4488 0.38927 2017 6 1 57905 0.0806 0.4492 0.38851 2017 6 2 57906 0.0822 0.4496 0.38771 2017 6 3 57907 0.0838 0.4499 0.38689 2017 6 4 57908 0.0854 0.4503 0.38610 2017 6 5 57909 0.0871 0.4506 0.38537 2017 6 6 57910 0.0887 0.4508 0.38472 2017 6 7 57911 0.0903 0.4511 0.38418 2017 6 8 57912 0.0919 0.4513 0.38376 2017 6 9 57913 0.0936 0.4515 0.38345 2017 6 10 57914 0.0952 0.4517 0.38324 2017 6 11 57915 0.0968 0.4519 0.38310 2017 6 12 57916 0.0985 0.4520 0.38297 2017 6 13 57917 0.1001 0.4521 0.38283 2017 6 14 57918 0.1018 0.4522 0.38262 2017 6 15 57919 0.1034 0.4522 0.38230 2017 6 16 57920 0.1050 0.4522 0.38185 2017 6 17 57921 0.1067 0.4522 0.38128 2017 6 18 57922 0.1083 0.4522 0.38057 2017 6 19 57923 0.1100 0.4522 0.37978 2017 6 20 57924 0.1116 0.4521 0.37896 2017 6 21 57925 0.1132 0.4520 0.37819 2017 6 22 57926 0.1148 0.4519 0.37751 2017 6 23 57927 0.1165 0.4517 0.37698 2017 6 24 57928 0.1181 0.4515 0.37656 2017 6 25 57929 0.1197 0.4513 0.37620 2017 6 26 57930 0.1213 0.4511 0.37585 2017 6 27 57931 0.1229 0.4508 0.37546 2017 6 28 57932 0.1245 0.4505 0.37500 2017 6 29 57933 0.1261 0.4502 0.37449 2017 6 30 57934 0.1277 0.4499 0.37397 2017 7 1 57935 0.1293 0.4496 0.37347 2017 7 2 57936 0.1308 0.4492 0.37304 2017 7 3 57937 0.1324 0.4488 0.37269 2017 7 4 57938 0.1339 0.4483 0.37245 2017 7 5 57939 0.1355 0.4479 0.37232 2017 7 6 57940 0.1370 0.4474 0.37230 2017 7 7 57941 0.1385 0.4469 0.37236 2017 7 8 57942 0.1400 0.4464 0.37248 2017 7 9 57943 0.1415 0.4458 0.37263 2017 7 10 57944 0.1430 0.4453 0.37274 2017 7 11 57945 0.1445 0.4447 0.37279 2017 7 12 57946 0.1459 0.4440 0.37272 2017 7 13 57947 0.1474 0.4434 0.37252 2017 7 14 57948 0.1488 0.4427 0.37218 2017 7 15 57949 0.1502 0.4420 0.37172 2017 7 16 57950 0.1516 0.4413 0.37116 2017 7 17 57951 0.1530 0.4406 0.37057 2017 7 18 57952 0.1544 0.4399 0.36999 2017 7 19 57953 0.1558 0.4391 0.36949 2017 7 20 57954 0.1571 0.4383 0.36909 2017 7 21 57955 0.1584 0.4375 0.36879 2017 7 22 57956 0.1597 0.4366 0.36856 2017 7 23 57957 0.1610 0.4358 0.36832 2017 7 24 57958 0.1623 0.4349 0.36802 2017 7 25 57959 0.1636 0.4340 0.36763 2017 7 26 57960 0.1648 0.4331 0.36715 2017 7 27 57961 0.1660 0.4321 0.36662 2017 7 28 57962 0.1672 0.4312 0.36607 2017 7 29 57963 0.1684 0.4302 0.36557 2017 7 30 57964 0.1696 0.4292 0.36515 2017 7 31 57965 0.1707 0.4282 0.36482 2017 8 1 57966 0.1719 0.4271 0.36459 2017 8 2 57967 0.1730 0.4261 0.36447 2017 8 3 57968 0.1740 0.4250 0.36443 2017 8 4 57969 0.1751 0.4239 0.36445 2017 8 5 57970 0.1761 0.4228 0.36448 2017 8 6 57971 0.1772 0.4217 0.36449 2017 8 7 57972 0.1781 0.4206 0.36447 2017 8 8 57973 0.1791 0.4194 0.36433 2017 8 9 57974 0.1801 0.4183 0.36406 2017 8 10 57975 0.1810 0.4171 0.36363 2017 8 11 57976 0.1819 0.4159 0.36306 2017 8 12 57977 0.1828 0.4147 0.36238 2017 8 13 57978 0.1836 0.4135 0.36166 2017 8 14 57979 0.1845 0.4122 0.36094 2017 8 15 57980 0.1853 0.4110 0.36029 2017 8 16 57981 0.1861 0.4097 0.35972 2017 8 17 57982 0.1868 0.4085 0.35924 2017 8 18 57983 0.1876 0.4072 0.35882 2017 8 19 57984 0.1883 0.4059 0.35841 2017 8 20 57985 0.1889 0.4046 0.35795 2017 8 21 57986 0.1896 0.4033 0.35739 2017 8 22 57987 0.1902 0.4019 0.35670 2017 8 23 57988 0.1908 0.4006 0.35591 2017 8 24 57989 0.1914 0.3992 0.35507 2017 8 25 57990 0.1920 0.3979 0.35423 2017 8 26 57991 0.1925 0.3965 0.35344 2017 8 27 57992 0.1930 0.3951 0.35273 2017 8 28 57993 0.1935 0.3938 0.35212 2017 8 29 57994 0.1939 0.3924 0.35162 2017 8 30 57995 0.1943 0.3910 0.35120 2017 8 31 57996 0.1947 0.3896 0.35084 2017 9 1 57997 0.1951 0.3882 0.35050 2017 9 2 57998 0.1954 0.3867 0.35015 2017 9 3 57999 0.1958 0.3853 0.34972 2017 9 4 58000 0.1960 0.3839 0.34919 2017 9 5 58001 0.1963 0.3825 0.34850 2017 9 6 58002 0.1965 0.3810 0.34765 2017 9 7 58003 0.1967 0.3796 0.34663 2017 9 8 58004 0.1969 0.3782 0.34548 2017 9 9 58005 0.1970 0.3767 0.34425 2017 9 10 58006 0.1972 0.3753 0.34302 2017 9 11 58007 0.1973 0.3738 0.34184 2017 9 12 58008 0.1973 0.3724 0.34077 2017 9 13 58009 0.1974 0.3709 0.33979 2017 9 14 58010 0.1974 0.3695 0.33889 2017 9 15 58011 0.1973 0.3680 0.33802 2017 9 16 58012 0.1973 0.3666 0.33712 2017 9 17 58013 0.1972 0.3651 0.33612 2017 9 18 58014 0.1971 0.3637 0.33499 2017 9 19 58015 0.1970 0.3622 0.33375 2017 9 20 58016 0.1968 0.3608 0.33242 2017 9 21 58017 0.1967 0.3593 0.33105 2017 9 22 58018 0.1964 0.3579 0.32971 2017 9 23 58019 0.1962 0.3565 0.32843 2017 9 24 58020 0.1959 0.3550 0.32725 2017 9 25 58021 0.1956 0.3536 0.32618 2017 9 26 58022 0.1953 0.3522 0.32521 2017 9 27 58023 0.1950 0.3507 0.32432 2017 9 28 58024 0.1946 0.3493 0.32347 2017 9 29 58025 0.1942 0.3479 0.32262 2017 9 30 58026 0.1938 0.3465 0.32172 2017 10 1 58027 0.1933 0.3451 0.32073 2017 10 2 58028 0.1928 0.3437 0.31960 2017 10 3 58029 0.1923 0.3424 0.31831 2017 10 4 58030 0.1918 0.3410 0.31684 2017 10 5 58031 0.1912 0.3396 0.31521 2017 10 6 58032 0.1906 0.3383 0.31347 2017 10 7 58033 0.1900 0.3369 0.31170 2017 10 8 58034 0.1894 0.3356 0.30997 2017 10 9 58035 0.1887 0.3343 0.30835 2017 10 10 58036 0.1881 0.3330 0.30686 2017 10 11 58037 0.1873 0.3316 0.30548 2017 10 12 58038 0.1866 0.3304 0.30416 2017 10 13 58039 0.1859 0.3291 0.30285 2017 10 14 58040 0.1851 0.3278 0.30147 2017 10 15 58041 0.1843 0.3265 0.30000 2017 10 16 58042 0.1834 0.3253 0.29843 2017 10 17 58043 0.1826 0.3241 0.29677 2017 10 18 58044 0.1817 0.3228 0.29506 2017 10 19 58045 0.1808 0.3216 0.29336 2017 10 20 58046 0.1799 0.3205 0.29172 2017 10 21 58047 0.1790 0.3193 0.29017 2017 10 22 58048 0.1780 0.3181 0.28874 2017 10 23 58049 0.1770 0.3170 0.28742 2017 10 24 58050 0.1760 0.3158 0.28620 2017 10 25 58051 0.1750 0.3147 0.28504 2017 10 26 58052 0.1739 0.3136 0.28390 2017 10 27 58053 0.1729 0.3125 0.28274 2017 10 28 58054 0.1718 0.3115 0.28151 2017 10 29 58055 0.1707 0.3104 0.28016 2017 10 30 58056 0.1695 0.3094 0.27867 2017 10 31 58057 0.1684 0.3084 0.27701 2017 11 1 58058 0.1672 0.3074 0.27520 2017 11 2 58059 0.1661 0.3064 0.27326 2017 11 3 58060 0.1649 0.3055 0.27125 2017 11 4 58061 0.1636 0.3045 0.26927 2017 11 5 58062 0.1624 0.3036 0.26739 2017 11 6 58063 0.1612 0.3027 0.26566 2017 11 7 58064 0.1599 0.3018 0.26409 2017 11 8 58065 0.1586 0.3010 0.26263 2017 11 9 58066 0.1573 0.3001 0.26122 2017 11 10 58067 0.1560 0.2993 0.25980 2017 11 11 58068 0.1547 0.2985 0.25830 2017 11 12 58069 0.1533 0.2977 0.25673 2017 11 13 58070 0.1520 0.2970 0.25509 2017 11 14 58071 0.1506 0.2962 0.25342 2017 11 15 58072 0.1492 0.2955 0.25178 2017 11 16 58073 0.1479 0.2948 0.25022 2017 11 17 58074 0.1465 0.2941 0.24876 2017 11 18 58075 0.1450 0.2935 0.24743 2017 11 19 58076 0.1436 0.2929 0.24622 2017 11 20 58077 0.1422 0.2923 0.24513 2017 11 21 58078 0.1407 0.2917 0.24412 2017 11 22 58079 0.1393 0.2911 0.24315 2017 11 23 58080 0.1378 0.2906 0.24218 2017 11 24 58081 0.1363 0.2901 0.24114 2017 11 25 58082 0.1348 0.2896 0.24001 2017 11 26 58083 0.1333 0.2891 0.23878 2017 11 27 58084 0.1318 0.2887 0.23743 2017 11 28 58085 0.1303 0.2883 0.23593 2017 11 29 58086 0.1288 0.2879 0.23429 2017 11 30 58087 0.1273 0.2875 0.23256 2017 12 1 58088 0.1258 0.2872 0.23080 2017 12 2 58089 0.1242 0.2868 0.22909 2017 12 3 58090 0.1227 0.2865 0.22751 2017 12 4 58091 0.1212 0.2863 0.22609 2017 12 5 58092 0.1196 0.2860 0.22483 2017 12 6 58093 0.1181 0.2858 0.22369 2017 12 7 58094 0.1165 0.2856 0.22257 2017 12 8 58095 0.1150 0.2854 0.22138 2017 12 9 58096 0.1134 0.2853 0.22008 2017 12 10 58097 0.1118 0.2851 0.21871 2017 12 11 58098 0.1103 0.2850 0.21734 2017 12 12 58099 0.1087 0.2850 0.21589 2017 12 13 58100 0.1072 0.2849 0.21443 2017 12 14 58101 0.1056 0.2849 0.21305 2017 12 15 58102 0.1041 0.2849 0.21179 2017 12 16 58103 0.1025 0.2849 0.21060 2017 12 17 58104 0.1009 0.2849 0.20951 2017 12 18 58105 0.0994 0.2850 0.20853 2017 12 19 58106 0.0978 0.2851 0.20762 2017 12 20 58107 0.0963 0.2852 0.20677 2017 12 21 58108 0.0947 0.2854 0.20595 2017 12 22 58109 0.0932 0.2855 0.20512 2017 12 23 58110 0.0917 0.2857 0.20422 2017 12 24 58111 0.0901 0.2860 0.20318 2017 12 25 58112 0.0886 0.2862 0.20198 2017 12 26 58113 0.0871 0.2865 0.20066 2017 12 27 58114 0.0856 0.2868 0.19921 2017 12 28 58115 0.0841 0.2871 0.19761 2017 12 29 58116 0.0826 0.2874 0.19598 2017 12 30 58117 0.0811 0.2878 0.19441 2017 12 31 58118 0.0796 0.2881 0.19297 2018 1 1 58119 0.0781 0.2886 0.19167 2018 1 2 58120 0.0767 0.2890 0.19046 2018 1 3 58121 0.0752 0.2894 0.18928 2018 1 4 58122 0.0738 0.2899 0.18802 2018 1 5 58123 0.0724 0.2904 0.18664 2018 1 6 58124 0.0709 0.2909 0.18517 2018 1 7 58125 0.0695 0.2915 0.18366 2018 1 8 58126 0.0681 0.2921 0.18214 2018 1 9 58127 0.0667 0.2926 0.18067 2018 1 10 58128 0.0654 0.2933 0.17932 2018 1 11 58129 0.0640 0.2939 0.17806 2018 1 12 58130 0.0626 0.2945 0.17685 2018 1 13 58131 0.0613 0.2952 0.17568 2018 1 14 58132 0.0600 0.2959 0.17459 2018 1 15 58133 0.0587 0.2966 0.17354 2018 1 16 58134 0.0574 0.2974 0.17255 2018 1 17 58135 0.0561 0.2981 0.17158 2018 1 18 58136 0.0549 0.2989 0.17057 2018 1 19 58137 0.0536 0.2997 0.16946 2018 1 20 58138 0.0524 0.3005 0.16824 2018 1 21 58139 0.0512 0.3014 0.16688 2018 1 22 58140 0.0500 0.3022 0.16541 2018 1 23 58141 0.0488 0.3031 0.16387 2018 1 24 58142 0.0477 0.3040 0.16230 2018 1 25 58143 0.0465 0.3049 0.16070 2018 1 26 58144 0.0454 0.3058 0.15915 2018 1 27 58145 0.0443 0.3068 0.15774 2018 1 28 58146 0.0432 0.3077 0.15648 2018 1 29 58147 0.0422 0.3087 0.15535 2018 1 30 58148 0.0411 0.3097 0.15429 2018 1 31 58149 0.0401 0.3107 0.15321 2018 2 1 58150 0.0391 0.3118 0.15200 2018 2 2 58151 0.0381 0.3128 0.15059 2018 2 3 58152 0.0371 0.3139 0.14904 2018 2 4 58153 0.0362 0.3150 0.14741 2018 2 5 58154 0.0353 0.3161 0.14580 2018 2 6 58155 0.0344 0.3172 0.14428 2018 2 7 58156 0.0335 0.3183 0.14288 2018 2 8 58157 0.0327 0.3194 0.14162 2018 2 9 58158 0.0319 0.3206 0.14049 2018 2 10 58159 0.0310 0.3217 0.13943 2018 2 11 58160 0.0303 0.3229 0.13837 2018 2 12 58161 0.0295 0.3241 0.13733 2018 2 13 58162 0.0288 0.3253 0.13630 2018 2 14 58163 0.0281 0.3265 0.13516 2018 2 15 58164 0.0274 0.3277 0.13385 2018 2 16 58165 0.0267 0.3290 0.13242 2018 2 17 58166 0.0261 0.3302 0.13088 2018 2 18 58167 0.0255 0.3315 0.12919 2018 2 19 58168 0.0249 0.3327 0.12734 2018 2 20 58169 0.0243 0.3340 0.12537 2018 2 21 58170 0.0238 0.3353 0.12332 2018 2 22 58171 0.0233 0.3366 0.12126 2018 2 23 58172 0.0228 0.3379 0.11932 2018 2 24 58173 0.0223 0.3392 0.11753 2018 2 25 58174 0.0219 0.3405 0.11582 2018 2 26 58175 0.0215 0.3418 0.11416 2018 2 27 58176 0.0211 0.3431 0.11253 2018 2 28 58177 0.0207 0.3445 0.11082 2018 3 1 58178 0.0204 0.3458 0.10901 2018 3 2 58179 0.0201 0.3471 0.10709 2018 3 3 58180 0.0198 0.3485 0.10512 2018 3 4 58181 0.0196 0.3498 0.10311 2018 3 5 58182 0.0194 0.3512 0.10120 2018 3 6 58183 0.0192 0.3526 0.09940 2018 3 7 58184 0.0190 0.3539 0.09774 2018 3 8 58185 0.0188 0.3553 0.09620 2018 3 9 58186 0.0187 0.3567 0.09476 2018 3 10 58187 0.0186 0.3580 0.09343 2018 3 11 58188 0.0186 0.3594 0.09215 2018 3 12 58189 0.0185 0.3608 0.09084 2018 3 13 58190 0.0185 0.3621 0.08947 2018 3 14 58191 0.0185 0.3635 0.08799 2018 3 15 58192 0.0186 0.3649 0.08636 2018 3 16 58193 0.0186 0.3663 0.08458 2018 3 17 58194 0.0187 0.3676 0.08261 2018 3 18 58195 0.0189 0.3690 0.08045 2018 3 19 58196 0.0190 0.3704 0.07815 2018 3 20 58197 0.0192 0.3717 0.07580 2018 3 21 58198 0.0194 0.3731 0.07347 2018 3 22 58199 0.0196 0.3744 0.07123 2018 3 23 58200 0.0199 0.3758 0.06906 2018 3 24 58201 0.0201 0.3772 0.06697 2018 3 25 58202 0.0204 0.3785 0.06493 2018 3 26 58203 0.0208 0.3798 0.06292 2018 3 27 58204 0.0211 0.3812 0.06080 2018 3 28 58205 0.0215 0.3825 0.05854 2018 3 29 58206 0.0219 0.3838 0.05613 2018 3 30 58207 0.0224 0.3851 0.05359 2018 3 31 58208 0.0228 0.3865 0.05095 2018 4 1 58209 0.0233 0.3878 0.04828 2018 4 2 58210 0.0238 0.3891 0.04562 2018 4 3 58211 0.0243 0.3903 0.04306 2018 4 4 58212 0.0249 0.3916 0.04072 2018 4 5 58213 0.0255 0.3929 0.03860 2018 4 6 58214 0.0261 0.3941 0.03666 2018 4 7 58215 0.0267 0.3954 0.03484 2018 4 8 58216 0.0274 0.3966 0.03308 2018 4 9 58217 0.0281 0.3979 0.03129 2018 4 10 58218 0.0288 0.3991 0.02947 2018 4 11 58219 0.0295 0.4003 0.02759 2018 4 12 58220 0.0302 0.4015 0.02564 2018 4 13 58221 0.0310 0.4027 0.02364 2018 4 14 58222 0.0318 0.4038 0.02160 2018 4 15 58223 0.0326 0.4050 0.01953 2018 4 16 58224 0.0335 0.4061 0.01738 2018 4 17 58225 0.0343 0.4073 0.01521 2018 4 18 58226 0.0352 0.4084 0.01312 2018 4 19 58227 0.0361 0.4095 0.01116 2018 4 20 58228 0.0370 0.4106 0.00936 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) 57841 -97.88 0.30 -11.83 0.05 57842 -98.09 0.30 -12.04 0.05 57843 -98.47 0.30 -12.39 0.05 IAU2000A Celestial Pole Offset Series MJD dX error dY error (msec. of arc) 57841 -0.156 0.119 -0.061 0.050 57842 -0.143 0.119 -0.067 0.050 57843 -0.113 0.119 -0.079 0.050 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).