********************************************************************** * * * I E R S B U L L E T I N - A * * * * Rapid Service/Prediction of Earth Orientation * ********************************************************************** 23 March 2017 Vol. XXX No. 012 ______________________________________________________________________ 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 = +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 by available by 20:00 UTC. * * * * As of Bulletin A Vol. XXX, No. 012, on 23 March 2017, we will * * transition the IERS RS/PC solution to be consistent with the * * ITRF 2014. This will result in a jump of less than 0.1 mas in * * polar motion and 10 us in UT1-UTC. Small adjustments to celestial * * pole offsets were also made in order to be more consistent with the * * IVS VLBI combined series solution. The only users who need to be * * concerned with this change are those who need EOP accuracy to * * better than 0.1 mas (~0.3 cm at the Earth's surface, ~1.3 cm at * * GPS orbit). * * * * 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 3 17 57829 0.00412 .00009 0.34897 .00009 0.493390 0.000009 17 3 18 57830 0.00445 .00009 0.35102 .00009 0.492078 0.000011 17 3 19 57831 0.00488 .00009 0.35327 .00009 0.490871 0.000008 17 3 20 57832 0.00524 .00009 0.35568 .00009 0.489743 0.000007 17 3 21 57833 0.00545 .00009 0.35805 .00009 0.488633 0.000007 17 3 22 57834 0.00566 .00009 0.36029 .00009 0.487468 0.000065 17 3 23 57835 0.00586 .00009 0.36253 .00009 0.486204 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 = 0.1118 - 0.0795 cos A + 0.0384 sin A - 0.0292 cos C - 0.0372 sin C y = 0.3710 + 0.0329 cos A + 0.0743 sin A - 0.0372 cos C + 0.0292 sin C UT1-UTC = 0.5010 - 0.00119 (MJD - 57843) - (UT2-UT1) where A = 2*pi*(MJD-57835)/365.25 and C = 2*pi*(MJD-57835)/435. TAI-UTC(MJD 57836) = 37.0 The accuracy may be estimated from the expressions: S x,y = 0.00068 (MJD-57835)**0.80 S t = 0.00025 (MJD-57835)**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 3 24 57836 0.0060 0.3646 0.48482 2017 3 25 57837 0.0060 0.3666 0.48332 2017 3 26 57838 0.0059 0.3685 0.48168 2017 3 27 57839 0.0060 0.3702 0.47990 2017 3 28 57840 0.0062 0.3718 0.47802 2017 3 29 57841 0.0065 0.3734 0.47610 2017 3 30 57842 0.0069 0.3749 0.47424 2017 3 31 57843 0.0073 0.3765 0.47250 2017 4 1 57844 0.0077 0.3781 0.47091 2017 4 2 57845 0.0081 0.3796 0.46943 2017 4 3 57846 0.0085 0.3811 0.46803 2017 4 4 57847 0.0089 0.3826 0.46665 2017 4 5 57848 0.0094 0.3841 0.46524 2017 4 6 57849 0.0099 0.3856 0.46380 2017 4 7 57850 0.0105 0.3871 0.46229 2017 4 8 57851 0.0111 0.3886 0.46072 2017 4 9 57852 0.0118 0.3902 0.45910 2017 4 10 57853 0.0125 0.3917 0.45745 2017 4 11 57854 0.0132 0.3932 0.45585 2017 4 12 57855 0.0139 0.3947 0.45431 2017 4 13 57856 0.0146 0.3962 0.45287 2017 4 14 57857 0.0154 0.3977 0.45155 2017 4 15 57858 0.0161 0.3991 0.45035 2017 4 16 57859 0.0169 0.4006 0.44927 2017 4 17 57860 0.0177 0.4019 0.44825 2017 4 18 57861 0.0186 0.4033 0.44726 2017 4 19 57862 0.0195 0.4047 0.44625 2017 4 20 57863 0.0204 0.4060 0.44516 2017 4 21 57864 0.0213 0.4073 0.44394 2017 4 22 57865 0.0222 0.4086 0.44254 2017 4 23 57866 0.0232 0.4099 0.44094 2017 4 24 57867 0.0242 0.4112 0.43917 2017 4 25 57868 0.0252 0.4125 0.43729 2017 4 26 57869 0.0263 0.4137 0.43538 2017 4 27 57870 0.0274 0.4149 0.43354 2017 4 28 57871 0.0285 0.4162 0.43184 2017 4 29 57872 0.0296 0.4174 0.43031 2017 4 30 57873 0.0308 0.4185 0.42894 2017 5 1 57874 0.0319 0.4197 0.42767 2017 5 2 57875 0.0331 0.4209 0.42644 2017 5 3 57876 0.0343 0.4220 0.42519 2017 5 4 57877 0.0355 0.4231 0.42389 2017 5 5 57878 0.0368 0.4242 0.42254 2017 5 6 57879 0.0380 0.4253 0.42115 2017 5 7 57880 0.0393 0.4263 0.41976 2017 5 8 57881 0.0406 0.4273 0.41840 2017 5 9 57882 0.0419 0.4283 0.41710 2017 5 10 57883 0.0433 0.4293 0.41589 2017 5 11 57884 0.0446 0.4303 0.41478 2017 5 12 57885 0.0460 0.4312 0.41379 2017 5 13 57886 0.0474 0.4322 0.41290 2017 5 14 57887 0.0488 0.4331 0.41209 2017 5 15 57888 0.0502 0.4339 0.41133 2017 5 16 57889 0.0517 0.4348 0.41057 2017 5 17 57890 0.0531 0.4356 0.40978 2017 5 18 57891 0.0546 0.4364 0.40890 2017 5 19 57892 0.0561 0.4372 0.40791 2017 5 20 57893 0.0576 0.4380 0.40677 2017 5 21 57894 0.0591 0.4387 0.40548 2017 5 22 57895 0.0606 0.4395 0.40407 2017 5 23 57896 0.0621 0.4402 0.40260 2017 5 24 57897 0.0637 0.4408 0.40114 2017 5 25 57898 0.0652 0.4415 0.39978 2017 5 26 57899 0.0668 0.4421 0.39858 2017 5 27 57900 0.0684 0.4427 0.39753 2017 5 28 57901 0.0700 0.4433 0.39660 2017 5 29 57902 0.0716 0.4438 0.39573 2017 5 30 57903 0.0732 0.4444 0.39486 2017 5 31 57904 0.0748 0.4449 0.39394 2017 6 1 57905 0.0764 0.4453 0.39297 2017 6 2 57906 0.0780 0.4458 0.39198 2017 6 3 57907 0.0797 0.4462 0.39098 2017 6 4 57908 0.0813 0.4466 0.39003 2017 6 5 57909 0.0830 0.4470 0.38914 2017 6 6 57910 0.0846 0.4473 0.38835 2017 6 7 57911 0.0863 0.4477 0.38769 2017 6 8 57912 0.0879 0.4480 0.38714 2017 6 9 57913 0.0896 0.4482 0.38670 2017 6 10 57914 0.0913 0.4485 0.38635 2017 6 11 57915 0.0929 0.4487 0.38606 2017 6 12 57916 0.0946 0.4489 0.38578 2017 6 13 57917 0.0963 0.4491 0.38549 2017 6 14 57918 0.0980 0.4492 0.38512 2017 6 15 57919 0.0997 0.4493 0.38466 2017 6 16 57920 0.1013 0.4494 0.38407 2017 6 17 57921 0.1030 0.4495 0.38335 2017 6 18 57922 0.1047 0.4495 0.38252 2017 6 19 57923 0.1064 0.4496 0.38160 2017 6 20 57924 0.1081 0.4496 0.38066 2017 6 21 57925 0.1097 0.4495 0.37977 2017 6 22 57926 0.1114 0.4495 0.37898 2017 6 23 57927 0.1131 0.4494 0.37834 2017 6 24 57928 0.1148 0.4492 0.37782 2017 6 25 57929 0.1164 0.4491 0.37737 2017 6 26 57930 0.1181 0.4489 0.37693 2017 6 27 57931 0.1197 0.4488 0.37645 2017 6 28 57932 0.1214 0.4485 0.37591 2017 6 29 57933 0.1230 0.4483 0.37532 2017 6 30 57934 0.1247 0.4480 0.37472 2017 7 1 57935 0.1263 0.4477 0.37414 2017 7 2 57936 0.1279 0.4474 0.37363 2017 7 3 57937 0.1295 0.4471 0.37321 2017 7 4 57938 0.1311 0.4467 0.37289 2017 7 5 57939 0.1327 0.4463 0.37269 2017 7 6 57940 0.1343 0.4459 0.37260 2017 7 7 57941 0.1359 0.4455 0.37261 2017 7 8 57942 0.1375 0.4450 0.37267 2017 7 9 57943 0.1390 0.4445 0.37277 2017 7 10 57944 0.1406 0.4440 0.37287 2017 7 11 57945 0.1421 0.4434 0.37292 2017 7 12 57946 0.1436 0.4429 0.37286 2017 7 13 57947 0.1451 0.4423 0.37266 2017 7 14 57948 0.1466 0.4417 0.37233 2017 7 15 57949 0.1481 0.4410 0.37188 2017 7 16 57950 0.1496 0.4404 0.37133 2017 7 17 57951 0.1511 0.4397 0.37075 2017 7 18 57952 0.1525 0.4390 0.37018 2017 7 19 57953 0.1539 0.4383 0.36968 2017 7 20 57954 0.1553 0.4376 0.36929 2017 7 21 57955 0.1567 0.4368 0.36899 2017 7 22 57956 0.1581 0.4360 0.36876 2017 7 23 57957 0.1595 0.4352 0.36854 2017 7 24 57958 0.1608 0.4344 0.36826 2017 7 25 57959 0.1622 0.4335 0.36789 2017 7 26 57960 0.1635 0.4326 0.36742 2017 7 27 57961 0.1648 0.4318 0.36690 2017 7 28 57962 0.1660 0.4308 0.36637 2017 7 29 57963 0.1673 0.4299 0.36588 2017 7 30 57964 0.1685 0.4290 0.36546 2017 7 31 57965 0.1697 0.4280 0.36514 2017 8 1 57966 0.1709 0.4270 0.36492 2017 8 2 57967 0.1721 0.4260 0.36481 2017 8 3 57968 0.1733 0.4250 0.36477 2017 8 4 57969 0.1744 0.4239 0.36479 2017 8 5 57970 0.1755 0.4229 0.36483 2017 8 6 57971 0.1766 0.4218 0.36484 2017 8 7 57972 0.1777 0.4207 0.36478 2017 8 8 57973 0.1787 0.4196 0.36461 2017 8 9 57974 0.1798 0.4185 0.36429 2017 8 10 57975 0.1808 0.4173 0.36381 2017 8 11 57976 0.1817 0.4162 0.36320 2017 8 12 57977 0.1827 0.4150 0.36247 2017 8 13 57978 0.1836 0.4138 0.36169 2017 8 14 57979 0.1845 0.4126 0.36092 2017 8 15 57980 0.1854 0.4114 0.36020 2017 8 16 57981 0.1863 0.4102 0.35956 2017 8 17 57982 0.1871 0.4090 0.35902 2017 8 18 57983 0.1879 0.4077 0.35853 2017 8 19 57984 0.1887 0.4065 0.35805 2017 8 20 57985 0.1895 0.4052 0.35751 2017 8 21 57986 0.1902 0.4039 0.35687 2017 8 22 57987 0.1909 0.4026 0.35611 2017 8 23 57988 0.1916 0.4013 0.35525 2017 8 24 57989 0.1922 0.4000 0.35433 2017 8 25 57990 0.1929 0.3986 0.35342 2017 8 26 57991 0.1935 0.3973 0.35256 2017 8 27 57992 0.1941 0.3960 0.35178 2017 8 28 57993 0.1946 0.3946 0.35110 2017 8 29 57994 0.1951 0.3932 0.35053 2017 8 30 57995 0.1956 0.3919 0.35004 2017 8 31 57996 0.1961 0.3905 0.34962 2017 9 1 57997 0.1965 0.3891 0.34922 2017 9 2 57998 0.1970 0.3877 0.34880 2017 9 3 57999 0.1973 0.3863 0.34831 2017 9 4 58000 0.1977 0.3849 0.34771 2017 9 5 58001 0.1980 0.3835 0.34696 2017 9 6 58002 0.1983 0.3821 0.34604 2017 9 7 58003 0.1986 0.3807 0.34496 2017 9 8 58004 0.1989 0.3792 0.34374 2017 9 9 58005 0.1991 0.3778 0.34245 2017 9 10 58006 0.1993 0.3764 0.34115 2017 9 11 58007 0.1995 0.3749 0.33992 2017 9 12 58008 0.1996 0.3735 0.33878 2017 9 13 58009 0.1997 0.3721 0.33774 2017 9 14 58010 0.1998 0.3706 0.33678 2017 9 15 58011 0.1998 0.3692 0.33584 2017 9 16 58012 0.1999 0.3678 0.33487 2017 9 17 58013 0.1999 0.3663 0.33381 2017 9 18 58014 0.1998 0.3649 0.33263 2017 9 19 58015 0.1998 0.3634 0.33132 2017 9 20 58016 0.1997 0.3620 0.32993 2017 9 21 58017 0.1996 0.3606 0.32851 2017 9 22 58018 0.1994 0.3591 0.32712 2017 9 23 58019 0.1993 0.3577 0.32580 2017 9 24 58020 0.1991 0.3563 0.32458 2017 9 25 58021 0.1988 0.3549 0.32347 2017 9 26 58022 0.1986 0.3534 0.32248 2017 9 27 58023 0.1983 0.3520 0.32157 2017 9 28 58024 0.1980 0.3506 0.32071 2017 9 29 58025 0.1977 0.3492 0.31986 2017 9 30 58026 0.1973 0.3478 0.31897 2017 10 1 58027 0.1969 0.3464 0.31799 2017 10 2 58028 0.1965 0.3450 0.31689 2017 10 3 58029 0.1961 0.3436 0.31563 2017 10 4 58030 0.1956 0.3423 0.31420 2017 10 5 58031 0.1951 0.3409 0.31262 2017 10 6 58032 0.1946 0.3395 0.31093 2017 10 7 58033 0.1940 0.3382 0.30921 2017 10 8 58034 0.1935 0.3368 0.30753 2017 10 9 58035 0.1929 0.3355 0.30596 2017 10 10 58036 0.1922 0.3342 0.30453 2017 10 11 58037 0.1916 0.3329 0.30321 2017 10 12 58038 0.1909 0.3316 0.30195 2017 10 13 58039 0.1902 0.3303 0.30070 2017 10 14 58040 0.1895 0.3290 0.29941 2017 10 15 58041 0.1888 0.3277 0.29802 2017 10 16 58042 0.1880 0.3265 0.29654 2017 10 17 58043 0.1872 0.3252 0.29496 2017 10 18 58044 0.1864 0.3240 0.29332 2017 10 19 58045 0.1855 0.3228 0.29165 2017 10 20 58046 0.1847 0.3216 0.29002 2017 10 21 58047 0.1838 0.3204 0.28844 2017 10 22 58048 0.1829 0.3192 0.28696 2017 10 23 58049 0.1820 0.3180 0.28558 2017 10 24 58050 0.1810 0.3169 0.28430 2017 10 25 58051 0.1800 0.3158 0.28311 2017 10 26 58052 0.1790 0.3146 0.28200 2017 10 27 58053 0.1780 0.3135 0.28092 2017 10 28 58054 0.1770 0.3125 0.27979 2017 10 29 58055 0.1759 0.3114 0.27854 2017 10 30 58056 0.1749 0.3103 0.27712 2017 10 31 58057 0.1738 0.3093 0.27555 2017 11 1 58058 0.1727 0.3083 0.27378 2017 11 2 58059 0.1715 0.3073 0.27181 2017 11 3 58060 0.1704 0.3063 0.26978 2017 11 4 58061 0.1692 0.3053 0.26773 2017 11 5 58062 0.1680 0.3044 0.26578 2017 11 6 58063 0.1668 0.3035 0.26402 2017 11 7 58064 0.1656 0.3025 0.26238 2017 11 8 58065 0.1644 0.3017 0.26092 2017 11 9 58066 0.1631 0.3008 0.25946 2017 11 10 58067 0.1618 0.2999 0.25795 2017 11 11 58068 0.1606 0.2991 0.25640 2017 11 12 58069 0.1593 0.2983 0.25475 2017 11 13 58070 0.1579 0.2975 0.25306 2017 11 14 58071 0.1566 0.2967 0.25127 2017 11 15 58072 0.1553 0.2960 0.24957 2017 11 16 58073 0.1539 0.2953 0.24786 2017 11 17 58074 0.1526 0.2946 0.24620 2017 11 18 58075 0.1512 0.2939 0.24455 2017 11 19 58076 0.1498 0.2932 0.24303 2017 11 20 58077 0.1484 0.2926 0.24160 2017 11 21 58078 0.1470 0.2920 0.24027 2017 11 22 58079 0.1456 0.2914 0.23903 2017 11 23 58080 0.1441 0.2908 0.23783 2017 11 24 58081 0.1427 0.2902 0.23660 2017 11 25 58082 0.1412 0.2897 0.23529 2017 11 26 58083 0.1398 0.2892 0.23390 2017 11 27 58084 0.1383 0.2887 0.23233 2017 11 28 58085 0.1368 0.2883 0.23069 2017 11 29 58086 0.1353 0.2878 0.22895 2017 11 30 58087 0.1338 0.2874 0.22708 2017 12 1 58088 0.1323 0.2870 0.22524 2017 12 2 58089 0.1308 0.2867 0.22345 2017 12 3 58090 0.1293 0.2863 0.22185 2017 12 4 58091 0.1278 0.2860 0.22045 2017 12 5 58092 0.1263 0.2857 0.21922 2017 12 6 58093 0.1248 0.2854 0.21811 2017 12 7 58094 0.1232 0.2852 0.21698 2017 12 8 58095 0.1217 0.2850 0.21572 2017 12 9 58096 0.1202 0.2848 0.21435 2017 12 10 58097 0.1186 0.2846 0.21290 2017 12 11 58098 0.1171 0.2845 0.21140 2017 12 12 58099 0.1156 0.2843 0.20995 2017 12 13 58100 0.1140 0.2842 0.20851 2017 12 14 58101 0.1125 0.2841 0.20722 2017 12 15 58102 0.1110 0.2841 0.20602 2017 12 16 58103 0.1094 0.2841 0.20494 2017 12 17 58104 0.1079 0.2841 0.20386 2017 12 18 58105 0.1063 0.2841 0.20286 2017 12 19 58106 0.1048 0.2841 0.20193 2017 12 20 58107 0.1033 0.2842 0.20102 2017 12 21 58108 0.1017 0.2843 0.20000 2017 12 22 58109 0.1002 0.2844 0.19894 2017 12 23 58110 0.0987 0.2845 0.19783 2017 12 24 58111 0.0972 0.2847 0.19655 2017 12 25 58112 0.0957 0.2849 0.19509 2017 12 26 58113 0.0942 0.2851 0.19346 2017 12 27 58114 0.0927 0.2853 0.19169 2017 12 28 58115 0.0912 0.2856 0.18977 2017 12 29 58116 0.0897 0.2859 0.18792 2017 12 30 58117 0.0882 0.2862 0.18616 2017 12 31 58118 0.0867 0.2865 0.18454 2018 1 1 58119 0.0853 0.2868 0.18305 2018 1 2 58120 0.0838 0.2872 0.18169 2018 1 3 58121 0.0824 0.2876 0.18038 2018 1 4 58122 0.0809 0.2880 0.17904 2018 1 5 58123 0.0795 0.2885 0.17764 2018 1 6 58124 0.0781 0.2889 0.17621 2018 1 7 58125 0.0767 0.2894 0.17469 2018 1 8 58126 0.0753 0.2899 0.17322 2018 1 9 58127 0.0739 0.2905 0.17185 2018 1 10 58128 0.0725 0.2910 0.17052 2018 1 11 58129 0.0712 0.2916 0.16932 2018 1 12 58130 0.0698 0.2922 0.16820 2018 1 13 58131 0.0685 0.2928 0.16725 2018 1 14 58132 0.0672 0.2934 0.16632 2018 1 15 58133 0.0659 0.2941 0.16540 2018 1 16 58134 0.0646 0.2948 0.16452 2018 1 17 58135 0.0633 0.2955 0.16362 2018 1 18 58136 0.0620 0.2962 0.16263 2018 1 19 58137 0.0608 0.2969 0.16153 2018 1 20 58138 0.0596 0.2977 0.16028 2018 1 21 58139 0.0583 0.2985 0.15881 2018 1 22 58140 0.0571 0.2992 0.15720 2018 1 23 58141 0.0560 0.3001 0.15543 2018 1 24 58142 0.0548 0.3009 0.15355 2018 1 25 58143 0.0537 0.3017 0.15165 2018 1 26 58144 0.0525 0.3026 0.14976 2018 1 27 58145 0.0514 0.3035 0.14790 2018 1 28 58146 0.0503 0.3044 0.14614 2018 1 29 58147 0.0493 0.3053 0.14449 2018 1 30 58148 0.0482 0.3062 0.14281 2018 1 31 58149 0.0472 0.3072 0.14102 2018 2 1 58150 0.0462 0.3082 0.13913 2018 2 2 58151 0.0452 0.3092 0.13709 2018 2 3 58152 0.0442 0.3102 0.13495 2018 2 4 58153 0.0433 0.3112 0.13267 2018 2 5 58154 0.0423 0.3122 0.13034 2018 2 6 58155 0.0414 0.3132 0.12808 2018 2 7 58156 0.0406 0.3143 0.12598 2018 2 8 58157 0.0397 0.3154 0.12411 2018 2 9 58158 0.0389 0.3165 0.12241 2018 2 10 58159 0.0380 0.3176 0.12085 2018 2 11 58160 0.0372 0.3187 0.11937 2018 2 12 58161 0.0365 0.3198 0.11788 2018 2 13 58162 0.0357 0.3209 0.11641 2018 2 14 58163 0.0350 0.3221 0.11497 2018 2 15 58164 0.0343 0.3232 0.11348 2018 2 16 58165 0.0336 0.3244 0.11194 2018 2 17 58166 0.0330 0.3256 0.11034 2018 2 18 58167 0.0323 0.3268 0.10865 2018 2 19 58168 0.0317 0.3280 0.10687 2018 2 20 58169 0.0312 0.3292 0.10494 2018 2 21 58170 0.0306 0.3304 0.10304 2018 2 22 58171 0.0301 0.3316 0.10112 2018 2 23 58172 0.0296 0.3328 0.09929 2018 2 24 58173 0.0291 0.3341 0.09757 2018 2 25 58174 0.0286 0.3353 0.09592 2018 2 26 58175 0.0282 0.3366 0.09435 2018 2 27 58176 0.0278 0.3379 0.09279 2018 2 28 58177 0.0274 0.3391 0.09120 2018 3 1 58178 0.0271 0.3404 0.08940 2018 3 2 58179 0.0268 0.3417 0.08747 2018 3 3 58180 0.0265 0.3430 0.08543 2018 3 4 58181 0.0262 0.3443 0.08341 2018 3 5 58182 0.0259 0.3455 0.08150 2018 3 6 58183 0.0257 0.3468 0.07968 2018 3 7 58184 0.0255 0.3481 0.07796 2018 3 8 58185 0.0254 0.3494 0.07631 2018 3 9 58186 0.0252 0.3508 0.07481 2018 3 10 58187 0.0251 0.3521 0.07345 2018 3 11 58188 0.0250 0.3534 0.07215 2018 3 12 58189 0.0250 0.3547 0.07086 2018 3 13 58190 0.0249 0.3560 0.06950 2018 3 14 58191 0.0249 0.3573 0.06819 2018 3 15 58192 0.0249 0.3586 0.06673 2018 3 16 58193 0.0250 0.3599 0.06512 2018 3 17 58194 0.0250 0.3612 0.06338 2018 3 18 58195 0.0251 0.3625 0.06144 2018 3 19 58196 0.0253 0.3639 0.05939 2018 3 20 58197 0.0254 0.3652 0.05728 2018 3 21 58198 0.0256 0.3665 0.05524 2018 3 22 58199 0.0258 0.3678 0.05328 2018 3 23 58200 0.0260 0.3691 0.05141 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) 57813 -99.10 0.30 -10.54 0.03 57814 -99.21 0.30 -10.72 0.03 57815 -99.41 0.30 -10.93 0.03 57816 -99.65 0.17 -11.05 0.07 57817 -99.90 0.12 -11.10 0.04 57818 -100.08 0.12 -11.12 0.04 57819 -100.12 0.30 -11.16 0.01 IAU2000A Celestial Pole Offset Series MJD dX error dY error (msec. of arc) 57813 -0.160 0.119 -0.211 0.030 57814 -0.157 0.119 -0.212 0.030 57815 -0.155 0.119 -0.203 0.030 57816 -0.155 0.068 -0.185 0.070 57817 -0.158 0.048 -0.172 0.040 57818 -0.162 0.048 -0.122 0.040 57819 -0.184 0.119 -0.054 0.010 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).