********************************************************************** * * * I E R S B U L L E T I N - A * * * * Rapid Service/Prediction of Earth Orientation * ********************************************************************** 9 February 2017 Vol. XXX No. 006 ______________________________________________________________________ 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 = +0.5 seconds beginning 26 Jan 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 by available by 20:00 UTC. * * * * Due to unforseen circumstances, the IERS RS/PC will not transition * * to the new 14C04 EOP system today. We regret any inconvenience. * * We anticipate that the change may occur on 23-Feb-2017 * * * * 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 2 3 57787 0.03049 .00009 0.28567 .00009 0.551294 0.000018 17 2 4 57788 0.03003 .00009 0.28689 .00009 0.549830 0.000017 17 2 5 57789 0.02924 .00009 0.28829 .00009 0.548469 0.000017 17 2 6 57790 0.02782 .00009 0.28965 .00009 0.547182 0.000018 17 2 7 57791 0.02579 .00009 0.29086 .00009 0.545945 0.000017 17 2 8 57792 0.02356 .00009 0.29195 .00009 0.544757 0.000017 17 2 9 57793 0.02146 .00009 0.29304 .00009 0.543487 0.000018 _______________________________________________________________________ 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 = 0.1082 - 0.0900 cos A - 0.0301 sin A + 0.0005 cos C - 0.0387 sin C y = 0.3646 - 0.0296 cos A + 0.0847 sin A - 0.0387 cos C - 0.0005 sin C UT1-UTC = 0.5382 - 0.00124 (MJD - 57801) - (UT2-UT1) where A = 2*pi*(MJD-57793)/365.25 and C = 2*pi*(MJD-57793)/435. TAI-UTC(MJD 57794) = 37.0 The accuracy may be estimated from the expressions: S x,y = 0.00068 (MJD-57793)**0.80 S t = 0.00025 (MJD-57793)**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 2 10 57794 0.0197 0.2941 0.54216 2017 2 11 57795 0.0182 0.2953 0.54075 2017 2 12 57796 0.0170 0.2965 0.53928 2017 2 13 57797 0.0159 0.2978 0.53777 2017 2 14 57798 0.0149 0.2991 0.53623 2017 2 15 57799 0.0139 0.3005 0.53468 2017 2 16 57800 0.0129 0.3019 0.53318 2017 2 17 57801 0.0119 0.3033 0.53176 2017 2 18 57802 0.0109 0.3047 0.53043 2017 2 19 57803 0.0100 0.3062 0.52919 2017 2 20 57804 0.0092 0.3076 0.52803 2017 2 21 57805 0.0084 0.3091 0.52691 2017 2 22 57806 0.0077 0.3105 0.52579 2017 2 23 57807 0.0070 0.3120 0.52466 2017 2 24 57808 0.0064 0.3135 0.52347 2017 2 25 57809 0.0057 0.3151 0.52218 2017 2 26 57810 0.0050 0.3167 0.52076 2017 2 27 57811 0.0043 0.3183 0.51917 2017 2 28 57812 0.0036 0.3199 0.51743 2017 3 1 57813 0.0029 0.3214 0.51559 2017 3 2 57814 0.0023 0.3230 0.51372 2017 3 3 57815 0.0017 0.3246 0.51190 2017 3 4 57816 0.0012 0.3262 0.51019 2017 3 5 57817 0.0007 0.3279 0.50859 2017 3 6 57818 0.0003 0.3295 0.50710 2017 3 7 57819 -0.0001 0.3311 0.50566 2017 3 8 57820 -0.0005 0.3328 0.50424 2017 3 9 57821 -0.0009 0.3344 0.50276 2017 3 10 57822 -0.0012 0.3361 0.50120 2017 3 11 57823 -0.0015 0.3378 0.49953 2017 3 12 57824 -0.0018 0.3394 0.49779 2017 3 13 57825 -0.0020 0.3411 0.49600 2017 3 14 57826 -0.0022 0.3428 0.49420 2017 3 15 57827 -0.0023 0.3445 0.49244 2017 3 16 57828 -0.0024 0.3461 0.49075 2017 3 17 57829 -0.0025 0.3478 0.48914 2017 3 18 57830 -0.0026 0.3495 0.48764 2017 3 19 57831 -0.0026 0.3512 0.48623 2017 3 20 57832 -0.0027 0.3529 0.48488 2017 3 21 57833 -0.0026 0.3546 0.48357 2017 3 22 57834 -0.0026 0.3563 0.48225 2017 3 23 57835 -0.0025 0.3580 0.48087 2017 3 24 57836 -0.0024 0.3597 0.47938 2017 3 25 57837 -0.0022 0.3614 0.47774 2017 3 26 57838 -0.0020 0.3631 0.47592 2017 3 27 57839 -0.0018 0.3648 0.47392 2017 3 28 57840 -0.0016 0.3665 0.47178 2017 3 29 57841 -0.0013 0.3681 0.46956 2017 3 30 57842 -0.0010 0.3698 0.46737 2017 3 31 57843 -0.0006 0.3715 0.46528 2017 4 1 57844 -0.0003 0.3732 0.46333 2017 4 2 57845 0.0002 0.3748 0.46154 2017 4 3 57846 0.0006 0.3765 0.45986 2017 4 4 57847 0.0011 0.3781 0.45825 2017 4 5 57848 0.0016 0.3798 0.45664 2017 4 6 57849 0.0021 0.3814 0.45499 2017 4 7 57850 0.0026 0.3831 0.45326 2017 4 8 57851 0.0032 0.3847 0.45146 2017 4 9 57852 0.0038 0.3863 0.44960 2017 4 10 57853 0.0045 0.3879 0.44773 2017 4 11 57854 0.0052 0.3895 0.44589 2017 4 12 57855 0.0059 0.3911 0.44412 2017 4 13 57856 0.0066 0.3927 0.44244 2017 4 14 57857 0.0074 0.3942 0.44087 2017 4 15 57858 0.0082 0.3958 0.43941 2017 4 16 57859 0.0090 0.3973 0.43804 2017 4 17 57860 0.0098 0.3988 0.43675 2017 4 18 57861 0.0107 0.4004 0.43547 2017 4 19 57862 0.0116 0.4019 0.43418 2017 4 20 57863 0.0125 0.4033 0.43282 2017 4 21 57864 0.0135 0.4048 0.43134 2017 4 22 57865 0.0145 0.4063 0.42971 2017 4 23 57866 0.0155 0.4077 0.42791 2017 4 24 57867 0.0165 0.4092 0.42597 2017 4 25 57868 0.0176 0.4106 0.42393 2017 4 26 57869 0.0187 0.4120 0.42187 2017 4 27 57870 0.0198 0.4134 0.41988 2017 4 28 57871 0.0209 0.4147 0.41804 2017 4 29 57872 0.0221 0.4161 0.41637 2017 4 30 57873 0.0232 0.4174 0.41485 2017 5 1 57874 0.0244 0.4187 0.41343 2017 5 2 57875 0.0257 0.4200 0.41205 2017 5 3 57876 0.0269 0.4213 0.41065 2017 5 4 57877 0.0282 0.4226 0.40921 2017 5 5 57878 0.0295 0.4238 0.40773 2017 5 6 57879 0.0308 0.4250 0.40622 2017 5 7 57880 0.0322 0.4262 0.40471 2017 5 8 57881 0.0335 0.4274 0.40324 2017 5 9 57882 0.0349 0.4286 0.40183 2017 5 10 57883 0.0363 0.4297 0.40052 2017 5 11 57884 0.0377 0.4308 0.39932 2017 5 12 57885 0.0392 0.4319 0.39823 2017 5 13 57886 0.0406 0.4330 0.39726 2017 5 14 57887 0.0421 0.4341 0.39637 2017 5 15 57888 0.0436 0.4351 0.39554 2017 5 16 57889 0.0451 0.4361 0.39471 2017 5 17 57890 0.0466 0.4371 0.39384 2017 5 18 57891 0.0482 0.4380 0.39288 2017 5 19 57892 0.0497 0.4390 0.39181 2017 5 20 57893 0.0513 0.4399 0.39060 2017 5 21 57894 0.0529 0.4408 0.38924 2017 5 22 57895 0.0545 0.4417 0.38775 2017 5 23 57896 0.0562 0.4425 0.38620 2017 5 24 57897 0.0578 0.4433 0.38466 2017 5 25 57898 0.0594 0.4441 0.38323 2017 5 26 57899 0.0611 0.4449 0.38194 2017 5 27 57900 0.0628 0.4456 0.38081 2017 5 28 57901 0.0645 0.4464 0.37980 2017 5 29 57902 0.0662 0.4470 0.37888 2017 5 30 57903 0.0679 0.4477 0.37795 2017 5 31 57904 0.0696 0.4484 0.37699 2017 6 1 57905 0.0713 0.4490 0.37599 2017 6 2 57906 0.0731 0.4496 0.37497 2017 6 3 57907 0.0748 0.4501 0.37395 2017 6 4 57908 0.0766 0.4507 0.37296 2017 6 5 57909 0.0783 0.4512 0.37205 2017 6 6 57910 0.0801 0.4517 0.37124 2017 6 7 57911 0.0819 0.4521 0.37054 2017 6 8 57912 0.0837 0.4526 0.36996 2017 6 9 57913 0.0854 0.4530 0.36949 2017 6 10 57914 0.0872 0.4533 0.36912 2017 6 11 57915 0.0890 0.4537 0.36881 2017 6 12 57916 0.0908 0.4540 0.36852 2017 6 13 57917 0.0926 0.4543 0.36822 2017 6 14 57918 0.0945 0.4546 0.36784 2017 6 15 57919 0.0963 0.4548 0.36736 2017 6 16 57920 0.0981 0.4550 0.36676 2017 6 17 57921 0.0999 0.4552 0.36602 2017 6 18 57922 0.1017 0.4554 0.36516 2017 6 19 57923 0.1035 0.4555 0.36422 2017 6 20 57924 0.1054 0.4556 0.36325 2017 6 21 57925 0.1072 0.4557 0.36233 2017 6 22 57926 0.1090 0.4557 0.36152 2017 6 23 57927 0.1108 0.4557 0.36085 2017 6 24 57928 0.1126 0.4557 0.36030 2017 6 25 57929 0.1144 0.4557 0.35982 2017 6 26 57930 0.1162 0.4556 0.35935 2017 6 27 57931 0.1180 0.4555 0.35883 2017 6 28 57932 0.1198 0.4554 0.35824 2017 6 29 57933 0.1216 0.4553 0.35761 2017 6 30 57934 0.1234 0.4551 0.35696 2017 7 1 57935 0.1252 0.4549 0.35633 2017 7 2 57936 0.1270 0.4547 0.35577 2017 7 3 57937 0.1287 0.4544 0.35530 2017 7 4 57938 0.1305 0.4541 0.35493 2017 7 5 57939 0.1323 0.4538 0.35468 2017 7 6 57940 0.1340 0.4535 0.35454 2017 7 7 57941 0.1357 0.4531 0.35449 2017 7 8 57942 0.1375 0.4528 0.35450 2017 7 9 57943 0.1392 0.4523 0.35453 2017 7 10 57944 0.1409 0.4519 0.35454 2017 7 11 57945 0.1426 0.4514 0.35449 2017 7 12 57946 0.1443 0.4509 0.35434 2017 7 13 57947 0.1459 0.4504 0.35405 2017 7 14 57948 0.1476 0.4499 0.35363 2017 7 15 57949 0.1493 0.4493 0.35309 2017 7 16 57950 0.1509 0.4487 0.35246 2017 7 17 57951 0.1525 0.4481 0.35179 2017 7 18 57952 0.1541 0.4475 0.35113 2017 7 19 57953 0.1557 0.4468 0.35054 2017 7 20 57954 0.1573 0.4461 0.35006 2017 7 21 57955 0.1589 0.4454 0.34967 2017 7 22 57956 0.1604 0.4447 0.34936 2017 7 23 57957 0.1619 0.4439 0.34904 2017 7 24 57958 0.1635 0.4431 0.34867 2017 7 25 57959 0.1650 0.4423 0.34821 2017 7 26 57960 0.1664 0.4415 0.34765 2017 7 27 57961 0.1679 0.4406 0.34704 2017 7 28 57962 0.1693 0.4398 0.34642 2017 7 29 57963 0.1708 0.4389 0.34583 2017 7 30 57964 0.1722 0.4379 0.34532 2017 7 31 57965 0.1736 0.4370 0.34491 2017 8 1 57966 0.1749 0.4360 0.34460 2017 8 2 57967 0.1763 0.4351 0.34439 2017 8 3 57968 0.1776 0.4341 0.34427 2017 8 4 57969 0.1789 0.4330 0.34421 2017 8 5 57970 0.1802 0.4320 0.34417 2017 8 6 57971 0.1815 0.4309 0.34410 2017 8 7 57972 0.1827 0.4299 0.34398 2017 8 8 57973 0.1839 0.4288 0.34375 2017 8 9 57974 0.1851 0.4276 0.34339 2017 8 10 57975 0.1863 0.4265 0.34289 2017 8 11 57976 0.1874 0.4253 0.34227 2017 8 12 57977 0.1886 0.4242 0.34156 2017 8 13 57978 0.1897 0.4230 0.34083 2017 8 14 57979 0.1907 0.4218 0.34014 2017 8 15 57980 0.1918 0.4206 0.33953 2017 8 16 57981 0.1928 0.4193 0.33903 2017 8 17 57982 0.1938 0.4181 0.33864 2017 8 18 57983 0.1948 0.4168 0.33832 2017 8 19 57984 0.1957 0.4155 0.33800 2017 8 20 57985 0.1967 0.4142 0.33761 2017 8 21 57986 0.1976 0.4129 0.33708 2017 8 22 57987 0.1984 0.4116 0.33640 2017 8 23 57988 0.1993 0.4103 0.33558 2017 8 24 57989 0.2001 0.4089 0.33468 2017 8 25 57990 0.2009 0.4075 0.33374 2017 8 26 57991 0.2017 0.4062 0.33283 2017 8 27 57992 0.2024 0.4048 0.33197 2017 8 28 57993 0.2031 0.4034 0.33120 2017 8 29 57994 0.2038 0.4020 0.33051 2017 8 30 57995 0.2045 0.4006 0.32989 2017 8 31 57996 0.2051 0.3991 0.32932 2017 9 1 57997 0.2057 0.3977 0.32876 2017 9 2 57998 0.2063 0.3963 0.32816 2017 9 3 57999 0.2068 0.3948 0.32749 2017 9 4 58000 0.2073 0.3933 0.32671 2017 9 5 58001 0.2078 0.3919 0.32580 2017 9 6 58002 0.2083 0.3904 0.32474 2017 9 7 58003 0.2087 0.3889 0.32353 2017 9 8 58004 0.2091 0.3874 0.32223 2017 9 9 58005 0.2095 0.3859 0.32090 2017 9 10 58006 0.2098 0.3844 0.31960 2017 9 11 58007 0.2101 0.3829 0.31842 2017 9 12 58008 0.2104 0.3814 0.31739 2017 9 13 58009 0.2106 0.3799 0.31649 2017 9 14 58010 0.2109 0.3784 0.31568 2017 9 15 58011 0.2111 0.3768 0.31486 2017 9 16 58012 0.2112 0.3753 0.31397 2017 9 17 58013 0.2114 0.3738 0.31297 2017 9 18 58014 0.2115 0.3723 0.31183 2017 9 19 58015 0.2115 0.3707 0.31058 2017 9 20 58016 0.2116 0.3692 0.30924 2017 9 21 58017 0.2116 0.3677 0.30788 2017 9 22 58018 0.2116 0.3661 0.30654 2017 9 23 58019 0.2115 0.3646 0.30526 2017 9 24 58020 0.2115 0.3631 0.30397 2017 9 25 58021 0.2114 0.3615 0.30275 2017 9 26 58022 0.2113 0.3600 0.30165 2017 9 27 58023 0.2111 0.3585 0.30060 2017 9 28 58024 0.2109 0.3570 0.29952 2017 9 29 58025 0.2107 0.3554 0.29844 2017 9 30 58026 0.2104 0.3539 0.29737 2017 10 1 58027 0.2102 0.3524 0.29615 2017 10 2 58028 0.2099 0.3509 0.29474 2017 10 3 58029 0.2095 0.3494 0.29314 2017 10 4 58030 0.2092 0.3479 0.29133 2017 10 5 58031 0.2088 0.3464 0.28927 2017 10 6 58032 0.2084 0.3449 0.28720 2017 10 7 58033 0.2079 0.3434 0.28510 2017 10 8 58034 0.2075 0.3420 0.28310 2017 10 9 58035 0.2070 0.3405 0.28122 2017 10 10 58036 0.2064 0.3390 0.27954 2017 10 11 58037 0.2059 0.3376 0.27799 2017 10 12 58038 0.2053 0.3361 0.27655 2017 10 13 58039 0.2047 0.3347 0.27515 2017 10 14 58040 0.2041 0.3333 0.27374 2017 10 15 58041 0.2034 0.3319 0.27221 2017 10 16 58042 0.2027 0.3305 0.27063 2017 10 17 58043 0.2020 0.3291 0.26901 2017 10 18 58044 0.2013 0.3277 0.26728 2017 10 19 58045 0.2005 0.3263 0.26558 2017 10 20 58046 0.1997 0.3250 0.26389 2017 10 21 58047 0.1989 0.3236 0.26235 2017 10 22 58048 0.1981 0.3223 0.26085 2017 10 23 58049 0.1972 0.3210 0.25938 2017 10 24 58050 0.1964 0.3197 0.25803 2017 10 25 58051 0.1954 0.3184 0.25676 2017 10 26 58052 0.1945 0.3171 0.25547 2017 10 27 58053 0.1936 0.3159 0.25416 2017 10 28 58054 0.1926 0.3146 0.25276 2017 10 29 58055 0.1916 0.3134 0.25117 2017 10 30 58056 0.1906 0.3122 0.24944 2017 10 31 58057 0.1895 0.3110 0.24748 2017 11 1 58058 0.1885 0.3098 0.24532 2017 11 2 58059 0.1874 0.3086 0.24303 2017 11 3 58060 0.1863 0.3075 0.24065 2017 11 4 58061 0.1851 0.3063 0.23823 2017 11 5 58062 0.1840 0.3052 0.23590 2017 11 6 58063 0.1828 0.3041 0.23376 2017 11 7 58064 0.1817 0.3030 0.23172 2017 11 8 58065 0.1805 0.3020 0.22973 2017 11 9 58066 0.1792 0.3009 0.22778 2017 11 10 58067 0.1780 0.2999 0.22580 2017 11 11 58068 0.1767 0.2989 0.22376 2017 11 12 58069 0.1755 0.2979 0.22156 2017 11 13 58070 0.1742 0.2969 0.21920 2017 11 14 58071 0.1729 0.2960 0.21682 2017 11 15 58072 0.1715 0.2951 0.21447 2017 11 16 58073 0.1702 0.2942 0.21229 2017 11 17 58074 0.1688 0.2933 0.21023 2017 11 18 58075 0.1675 0.2924 0.20832 2017 11 19 58076 0.1661 0.2916 0.20654 2017 11 20 58077 0.1647 0.2908 0.20482 2017 11 21 58078 0.1633 0.2900 0.20323 2017 11 22 58079 0.1619 0.2892 0.20176 2017 11 23 58080 0.1604 0.2884 0.20037 2017 11 24 58081 0.1590 0.2877 0.19901 2017 11 25 58082 0.1575 0.2870 0.19767 2017 11 26 58083 0.1560 0.2863 0.19626 2017 11 27 58084 0.1546 0.2857 0.19474 2017 11 28 58085 0.1531 0.2850 0.19300 2017 11 29 58086 0.1516 0.2844 0.19118 2017 11 30 58087 0.1501 0.2838 0.18919 2017 12 1 58088 0.1485 0.2832 0.18719 2017 12 2 58089 0.1470 0.2827 0.18524 2017 12 3 58090 0.1455 0.2822 0.18340 2017 12 4 58091 0.1439 0.2817 0.18174 2017 12 5 58092 0.1424 0.2812 0.18024 2017 12 6 58093 0.1408 0.2807 0.17890 2017 12 7 58094 0.1393 0.2803 0.17749 2017 12 8 58095 0.1377 0.2799 0.17604 2017 12 9 58096 0.1361 0.2795 0.17451 2017 12 10 58097 0.1345 0.2792 0.17295 2017 12 11 58098 0.1330 0.2789 0.17143 2017 12 12 58099 0.1314 0.2786 0.16991 2017 12 13 58100 0.1298 0.2783 0.16842 2017 12 14 58101 0.1282 0.2780 0.16694 2017 12 15 58102 0.1266 0.2778 0.16559 2017 12 16 58103 0.1250 0.2776 0.16442 2017 12 17 58104 0.1234 0.2774 0.16335 2017 12 18 58105 0.1218 0.2772 0.16239 2017 12 19 58106 0.1202 0.2771 0.16145 2017 12 20 58107 0.1186 0.2770 0.16067 2017 12 21 58108 0.1170 0.2769 0.15985 2017 12 22 58109 0.1154 0.2769 0.15896 2017 12 23 58110 0.1138 0.2768 0.15799 2017 12 24 58111 0.1123 0.2768 0.15683 2017 12 25 58112 0.1107 0.2769 0.15551 2017 12 26 58113 0.1091 0.2769 0.15404 2017 12 27 58114 0.1075 0.2770 0.15248 2017 12 28 58115 0.1059 0.2771 0.15084 2017 12 29 58116 0.1044 0.2772 0.14919 2017 12 30 58117 0.1028 0.2773 0.14771 2017 12 31 58118 0.1012 0.2775 0.14625 2018 1 1 58119 0.0997 0.2777 0.14503 2018 1 2 58120 0.0981 0.2779 0.14381 2018 1 3 58121 0.0966 0.2781 0.14255 2018 1 4 58122 0.0951 0.2784 0.14114 2018 1 5 58123 0.0935 0.2787 0.13960 2018 1 6 58124 0.0920 0.2790 0.13793 2018 1 7 58125 0.0905 0.2793 0.13617 2018 1 8 58126 0.0890 0.2797 0.13437 2018 1 9 58127 0.0875 0.2801 0.13265 2018 1 10 58128 0.0860 0.2805 0.13094 2018 1 11 58129 0.0846 0.2809 0.12935 2018 1 12 58130 0.0831 0.2813 0.12791 2018 1 13 58131 0.0817 0.2818 0.12670 2018 1 14 58132 0.0802 0.2823 0.12557 2018 1 15 58133 0.0788 0.2828 0.12441 2018 1 16 58134 0.0774 0.2834 0.12336 2018 1 17 58135 0.0760 0.2839 0.12216 2018 1 18 58136 0.0746 0.2845 0.12103 2018 1 19 58137 0.0733 0.2851 0.11983 2018 1 20 58138 0.0719 0.2857 0.11850 2018 1 21 58139 0.0706 0.2864 0.11704 2018 1 22 58140 0.0693 0.2870 0.11545 2018 1 23 58141 0.0680 0.2877 0.11371 2018 1 24 58142 0.0667 0.2884 0.11191 2018 1 25 58143 0.0654 0.2892 0.11015 2018 1 26 58144 0.0641 0.2899 0.10845 2018 1 27 58145 0.0629 0.2907 0.10675 2018 1 28 58146 0.0617 0.2915 0.10529 2018 1 29 58147 0.0605 0.2923 0.10382 2018 1 30 58148 0.0593 0.2931 0.10227 2018 1 31 58149 0.0581 0.2940 0.10060 2018 2 1 58150 0.0570 0.2948 0.09884 2018 2 2 58151 0.0558 0.2957 0.09697 2018 2 3 58152 0.0547 0.2966 0.09497 2018 2 4 58153 0.0536 0.2975 0.09293 2018 2 5 58154 0.0526 0.2984 0.09103 2018 2 6 58155 0.0515 0.2994 0.08927 2018 2 7 58156 0.0505 0.3004 0.08752 2018 2 8 58157 0.0495 0.3013 0.08591 2018 2 9 58158 0.0485 0.3023 0.08447 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).