********************************************************************** * * * I E R S B U L L E T I N - A * * * * Rapid Service/Prediction of Earth Orientation * ********************************************************************** 28 April 2011 Vol. XXIV 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 = -0.2 seconds beginning 6 January 2011 at 0000 UTC = -0.3 seconds beginning 12 May 2011 at 0000 UTC Beginning 1 January 2009: TAI-UTC(BIPM) = 34.000 000 seconds ********************************************************************** * As of Bulletin A Vol. XXIV, No. 017, on 28 April 2011, we have * * incorporated the new GSFC VLBI solutions gsf2011a.eops and * * gsf2011a.eopi. The effect appears to be less than 0.1 mas in * * polar motion and 10 us in UT1-UTC. * ********************************************************************** ________________________________________________________________________ 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 11 4 22 55673 -.04504 .00010 0.32222 .00009 -0.236174 0.000012 11 4 23 55674 -.04525 .00009 0.32398 .00010 -0.236894 0.000015 11 4 24 55675 -.04580 .00009 0.32581 .00010 -0.237696 0.000013 11 4 25 55676 -.04615 .00009 0.32753 .00010 -0.238575 0.000010 11 4 26 55677 -.04601 .00009 0.32925 .00010 -0.239535 0.000010 11 4 27 55678 -.04567 .00009 0.33133 .00009 -0.240557 0.000009 11 4 28 55679 -.04536 .00009 0.33361 .00009 -0.241620 0.000008 _______________________________________________________________________ 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 = 0.0885 - 0.1010 cos A + 0.0484 sin A - 0.0314 cos C - 0.0391 sin C y = 0.3269 + 0.0452 cos A + 0.0919 sin A - 0.0391 cos C + 0.0314 sin C UT1-UTC = -0.2113 - 0.00063 (MJD - 55687) - (UT2-UT1) where A = 2*pi*(MJD-55679)/365.25 and C = 2*pi*(MJD-55679)/435. TAI-UTC(MJD 55680) = 34.0 The accuracy may be estimated from the expressions: S x,y = 0.00068 (MJD-55679)**0.80 S t = 0.00025 (MJD-55679)**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) 2011 4 29 55680 -0.0451 0.3358 -0.24278 2011 4 30 55681 -0.0448 0.3379 -0.24394 2011 5 1 55682 -0.0445 0.3400 -0.24501 2011 5 2 55683 -0.0442 0.3420 -0.24599 2011 5 3 55684 -0.0438 0.3439 -0.24690 2011 5 4 55685 -0.0433 0.3457 -0.24773 2011 5 5 55686 -0.0428 0.3476 -0.24851 2011 5 6 55687 -0.0422 0.3495 -0.24925 2011 5 7 55688 -0.0416 0.3513 -0.24996 2011 5 8 55689 -0.0410 0.3532 -0.25069 2011 5 9 55690 -0.0403 0.3550 -0.25148 2011 5 10 55691 -0.0397 0.3568 -0.25242 2011 5 11 55692 -0.0390 0.3586 -0.25351 2011 5 12 55693 -0.0382 0.3604 -0.25475 2011 5 13 55694 -0.0374 0.3621 -0.25609 2011 5 14 55695 -0.0366 0.3639 -0.25742 2011 5 15 55696 -0.0358 0.3656 -0.25865 2011 5 16 55697 -0.0349 0.3673 -0.25965 2011 5 17 55698 -0.0341 0.3690 -0.26039 2011 5 18 55699 -0.0331 0.3707 -0.26088 2011 5 19 55700 -0.0322 0.3724 -0.26122 2011 5 20 55701 -0.0312 0.3741 -0.26152 2011 5 21 55702 -0.0302 0.3757 -0.26185 2011 5 22 55703 -0.0292 0.3773 -0.26226 2011 5 23 55704 -0.0282 0.3789 -0.26279 2011 5 24 55705 -0.0271 0.3805 -0.26340 2011 5 25 55706 -0.0260 0.3821 -0.26408 2011 5 26 55707 -0.0249 0.3837 -0.26477 2011 5 27 55708 -0.0238 0.3852 -0.26543 2011 5 28 55709 -0.0226 0.3867 -0.26601 2011 5 29 55710 -0.0215 0.3882 -0.26646 2011 5 30 55711 -0.0203 0.3897 -0.26676 2011 5 31 55712 -0.0190 0.3912 -0.26691 2011 6 1 55713 -0.0178 0.3927 -0.26692 2011 6 2 55714 -0.0165 0.3941 -0.26685 2011 6 3 55715 -0.0153 0.3955 -0.26675 2011 6 4 55716 -0.0140 0.3969 -0.26669 2011 6 5 55717 -0.0126 0.3983 -0.26675 2011 6 6 55718 -0.0113 0.3996 -0.26698 2011 6 7 55719 -0.0099 0.4010 -0.26739 2011 6 8 55720 -0.0086 0.4023 -0.26796 2011 6 9 55721 -0.0072 0.4036 -0.26863 2011 6 10 55722 -0.0058 0.4048 -0.26931 2011 6 11 55723 -0.0043 0.4061 -0.26990 2011 6 12 55724 -0.0029 0.4073 -0.27033 2011 6 13 55725 -0.0014 0.4085 -0.27055 2011 6 14 55726 0.0000 0.4097 -0.27055 2011 6 15 55727 0.0015 0.4109 -0.27040 2011 6 16 55728 0.0030 0.4120 -0.27016 2011 6 17 55729 0.0046 0.4131 -0.26993 2011 6 18 55730 0.0061 0.4142 -0.26976 2011 6 19 55731 0.0076 0.4153 -0.26969 2011 6 20 55732 0.0092 0.4163 -0.26971 2011 6 21 55733 0.0108 0.4174 -0.26979 2011 6 22 55734 0.0123 0.4184 -0.26989 2011 6 23 55735 0.0139 0.4193 -0.26997 2011 6 24 55736 0.0155 0.4203 -0.27000 2011 6 25 55737 0.0172 0.4212 -0.26992 2011 6 26 55738 0.0188 0.4221 -0.26973 2011 6 27 55739 0.0204 0.4230 -0.26940 2011 6 28 55740 0.0221 0.4239 -0.26895 2011 6 29 55741 0.0237 0.4247 -0.26841 2011 6 30 55742 0.0254 0.4255 -0.26784 2011 7 1 55743 0.0270 0.4263 -0.26731 2011 7 2 55744 0.0287 0.4270 -0.26689 2011 7 3 55745 0.0304 0.4278 -0.26664 2011 7 4 55746 0.0321 0.4285 -0.26658 2011 7 5 55747 0.0338 0.4292 -0.26671 2011 7 6 55748 0.0355 0.4298 -0.26696 2011 7 7 55749 0.0372 0.4304 -0.26724 2011 7 8 55750 0.0389 0.4310 -0.26746 2011 7 9 55751 0.0406 0.4316 -0.26751 2011 7 10 55752 0.0423 0.4322 -0.26737 2011 7 11 55753 0.0440 0.4327 -0.26702 2011 7 12 55754 0.0458 0.4332 -0.26651 2011 7 13 55755 0.0475 0.4337 -0.26591 2011 7 14 55756 0.0492 0.4341 -0.26531 2011 7 15 55757 0.0509 0.4346 -0.26477 2011 7 16 55758 0.0527 0.4350 -0.26434 2011 7 17 55759 0.0544 0.4354 -0.26403 2011 7 18 55760 0.0561 0.4357 -0.26381 2011 7 19 55761 0.0579 0.4360 -0.26365 2011 7 20 55762 0.0596 0.4363 -0.26350 2011 7 21 55763 0.0613 0.4366 -0.26332 2011 7 22 55764 0.0630 0.4369 -0.26307 2011 7 23 55765 0.0648 0.4371 -0.26271 2011 7 24 55766 0.0665 0.4373 -0.26224 2011 7 25 55767 0.0682 0.4375 -0.26167 2011 7 26 55768 0.0699 0.4376 -0.26102 2011 7 27 55769 0.0716 0.4377 -0.26033 2011 7 28 55770 0.0733 0.4378 -0.25967 2011 7 29 55771 0.0750 0.4379 -0.25911 2011 7 30 55772 0.0767 0.4379 -0.25874 2011 7 31 55773 0.0784 0.4380 -0.25859 2011 8 1 55774 0.0801 0.4380 -0.25868 2011 8 2 55775 0.0818 0.4379 -0.25895 2011 8 3 55776 0.0834 0.4379 -0.25931 2011 8 4 55777 0.0851 0.4378 -0.25964 2011 8 5 55778 0.0867 0.4377 -0.25983 2011 8 6 55779 0.0884 0.4376 -0.25983 2011 8 7 55780 0.0900 0.4375 -0.25962 2011 8 8 55781 0.0916 0.4373 -0.25925 2011 8 9 55782 0.0933 0.4371 -0.25879 2011 8 10 55783 0.0949 0.4369 -0.25832 2011 8 11 55784 0.0965 0.4366 -0.25791 2011 8 12 55785 0.0981 0.4364 -0.25762 2011 8 13 55786 0.0996 0.4361 -0.25746 2011 8 14 55787 0.1012 0.4358 -0.25743 2011 8 15 55788 0.1028 0.4355 -0.25750 2011 8 16 55789 0.1043 0.4351 -0.25760 2011 8 17 55790 0.1058 0.4347 -0.25770 2011 8 18 55791 0.1074 0.4343 -0.25775 2011 8 19 55792 0.1089 0.4339 -0.25771 2011 8 20 55793 0.1104 0.4335 -0.25758 2011 8 21 55794 0.1118 0.4330 -0.25736 2011 8 22 55795 0.1133 0.4325 -0.25705 2011 8 23 55796 0.1148 0.4320 -0.25671 2011 8 24 55797 0.1162 0.4315 -0.25638 2011 8 25 55798 0.1176 0.4310 -0.25613 2011 8 26 55799 0.1190 0.4304 -0.25605 2011 8 27 55800 0.1204 0.4298 -0.25619 2011 8 28 55801 0.1218 0.4292 -0.25660 2011 8 29 55802 0.1231 0.4286 -0.25724 2011 8 30 55803 0.1245 0.4280 -0.25805 2011 8 31 55804 0.1258 0.4273 -0.25889 2011 9 1 55805 0.1271 0.4266 -0.25964 2011 9 2 55806 0.1284 0.4259 -0.26020 2011 9 3 55807 0.1297 0.4252 -0.26053 2011 9 4 55808 0.1310 0.4245 -0.26067 2011 9 5 55809 0.1322 0.4237 -0.26069 2011 9 6 55810 0.1334 0.4230 -0.26068 2011 9 7 55811 0.1346 0.4222 -0.26072 2011 9 8 55812 0.1358 0.4214 -0.26086 2011 9 9 55813 0.1370 0.4206 -0.26112 2011 9 10 55814 0.1381 0.4197 -0.26151 2011 9 11 55815 0.1393 0.4189 -0.26201 2011 9 12 55816 0.1404 0.4180 -0.26256 2011 9 13 55817 0.1415 0.4171 -0.26313 2011 9 14 55818 0.1426 0.4162 -0.26367 2011 9 15 55819 0.1436 0.4153 -0.26413 2011 9 16 55820 0.1447 0.4144 -0.26450 2011 9 17 55821 0.1457 0.4135 -0.26478 2011 9 18 55822 0.1467 0.4125 -0.26497 2011 9 19 55823 0.1476 0.4116 -0.26510 2011 9 20 55824 0.1486 0.4106 -0.26523 2011 9 21 55825 0.1495 0.4096 -0.26541 2011 9 22 55826 0.1504 0.4086 -0.26571 2011 9 23 55827 0.1513 0.4076 -0.26620 2011 9 24 55828 0.1522 0.4066 -0.26694 2011 9 25 55829 0.1530 0.4055 -0.26793 2011 9 26 55830 0.1539 0.4045 -0.26914 2011 9 27 55831 0.1547 0.4034 -0.27047 2011 9 28 55832 0.1555 0.4023 -0.27178 2011 9 29 55833 0.1562 0.4013 -0.27294 2011 9 30 55834 0.1570 0.4002 -0.27389 2011 10 1 55835 0.1577 0.3991 -0.27462 2011 10 2 55836 0.1584 0.3980 -0.27518 2011 10 3 55837 0.1591 0.3968 -0.27567 2011 10 4 55838 0.1597 0.3957 -0.27617 2011 10 5 55839 0.1604 0.3946 -0.27676 2011 10 6 55840 0.1610 0.3935 -0.27746 2011 10 7 55841 0.1616 0.3923 -0.27826 2011 10 8 55842 0.1621 0.3911 -0.27917 2011 10 9 55843 0.1627 0.3900 -0.28013 2011 10 10 55844 0.1632 0.3888 -0.28111 2011 10 11 55845 0.1637 0.3876 -0.28206 2011 10 12 55846 0.1642 0.3865 -0.28295 2011 10 13 55847 0.1647 0.3853 -0.28374 2011 10 14 55848 0.1651 0.3841 -0.28442 2011 10 15 55849 0.1655 0.3829 -0.28501 2011 10 16 55850 0.1659 0.3817 -0.28553 2011 10 17 55851 0.1663 0.3805 -0.28601 2011 10 18 55852 0.1666 0.3793 -0.28652 2011 10 19 55853 0.1670 0.3781 -0.28711 2011 10 20 55854 0.1673 0.3769 -0.28784 2011 10 21 55855 0.1675 0.3756 -0.28877 2011 10 22 55856 0.1678 0.3744 -0.28992 2011 10 23 55857 0.1681 0.3732 -0.29129 2011 10 24 55858 0.1683 0.3720 -0.29282 2011 10 25 55859 0.1685 0.3707 -0.29438 2011 10 26 55860 0.1687 0.3695 -0.29587 2011 10 27 55861 0.1688 0.3683 -0.29718 2011 10 28 55862 0.1689 0.3671 -0.29825 2011 10 29 55863 0.1691 0.3658 -0.29911 2011 10 30 55864 0.1692 0.3646 -0.29984 2011 10 31 55865 0.1692 0.3634 -0.30053 2011 11 1 55866 0.1693 0.3622 -0.30126 2011 11 2 55867 0.1693 0.3609 -0.30208 2011 11 3 55868 0.1693 0.3597 -0.30299 2011 11 4 55869 0.1693 0.3585 -0.30399 2011 11 5 55870 0.1693 0.3573 -0.30505 2011 11 6 55871 0.1692 0.3560 -0.30613 2011 11 7 55872 0.1692 0.3548 -0.30720 2011 11 8 55873 0.1691 0.3536 -0.30823 2011 11 9 55874 0.1690 0.3524 -0.30918 2011 11 10 55875 0.1689 0.3512 -0.31002 2011 11 11 55876 0.1687 0.3500 -0.31077 2011 11 12 55877 0.1686 0.3488 -0.31143 2011 11 13 55878 0.1684 0.3476 -0.31204 2011 11 14 55879 0.1682 0.3464 -0.31265 2011 11 15 55880 0.1680 0.3452 -0.31331 2011 11 16 55881 0.1677 0.3440 -0.31407 2011 11 17 55882 0.1675 0.3429 -0.31499 2011 11 18 55883 0.1672 0.3417 -0.31609 2011 11 19 55884 0.1669 0.3405 -0.31738 2011 11 20 55885 0.1666 0.3394 -0.31883 2011 11 21 55886 0.1663 0.3382 -0.32037 2011 11 22 55887 0.1659 0.3371 -0.32191 2011 11 23 55888 0.1656 0.3359 -0.32336 2011 11 24 55889 0.1652 0.3348 -0.32464 2011 11 25 55890 0.1648 0.3337 -0.32575 2011 11 26 55891 0.1644 0.3325 -0.32673 2011 11 27 55892 0.1640 0.3314 -0.32767 2011 11 28 55893 0.1635 0.3303 -0.32865 2011 11 29 55894 0.1631 0.3292 -0.32973 2011 11 30 55895 0.1626 0.3281 -0.33091 2011 12 1 55896 0.1621 0.3271 -0.33215 2011 12 2 55897 0.1616 0.3260 -0.33342 2011 12 3 55898 0.1611 0.3249 -0.33466 2011 12 4 55899 0.1606 0.3239 -0.33584 2011 12 5 55900 0.1601 0.3228 -0.33689 2011 12 6 55901 0.1595 0.3218 -0.33776 2011 12 7 55902 0.1589 0.3208 -0.33844 2011 12 8 55903 0.1584 0.3198 -0.33890 2011 12 9 55904 0.1578 0.3188 -0.33918 2011 12 10 55905 0.1572 0.3178 -0.33942 2011 12 11 55906 0.1565 0.3168 -0.33959 2011 12 12 55907 0.1559 0.3158 -0.33980 2011 12 13 55908 0.1553 0.3149 -0.34010 2011 12 14 55909 0.1546 0.3139 -0.34057 2011 12 15 55910 0.1540 0.3130 -0.34120 2011 12 16 55911 0.1533 0.3120 -0.34193 2011 12 17 55912 0.1526 0.3111 -0.34280 2011 12 18 55913 0.1519 0.3102 -0.34369 2011 12 19 55914 0.1512 0.3093 -0.34455 2011 12 20 55915 0.1505 0.3084 -0.34538 2011 12 21 55916 0.1498 0.3076 -0.34607 2011 12 22 55917 0.1490 0.3067 -0.34659 2011 12 23 55918 0.1483 0.3059 -0.34695 2011 12 24 55919 0.1475 0.3050 -0.34724 2011 12 25 55920 0.1468 0.3042 -0.34757 2011 12 26 55921 0.1460 0.3034 -0.34796 2011 12 27 55922 0.1453 0.3026 -0.34851 2011 12 28 55923 0.1445 0.3018 -0.34921 2011 12 29 55924 0.1437 0.3010 -0.34999 2011 12 30 55925 0.1429 0.3003 -0.35080 2011 12 31 55926 0.1421 0.2995 -0.35165 2012 1 1 55927 0.1413 0.2988 -0.35243 2012 1 2 55928 0.1405 0.2981 -0.35309 2012 1 3 55929 0.1397 0.2974 -0.35361 2012 1 4 55930 0.1388 0.2967 -0.35401 2012 1 5 55931 0.1380 0.2960 -0.35432 2012 1 6 55932 0.1372 0.2953 -0.35461 2012 1 7 55933 0.1363 0.2947 -0.35493 2012 1 8 55934 0.1355 0.2940 -0.35529 2012 1 9 55935 0.1346 0.2934 -0.35576 2012 1 10 55936 0.1338 0.2928 -0.35639 2012 1 11 55937 0.1329 0.2922 -0.35718 2012 1 12 55938 0.1321 0.2916 -0.35814 2012 1 13 55939 0.1312 0.2910 -0.35926 2012 1 14 55940 0.1304 0.2904 -0.36051 2012 1 15 55941 0.1295 0.2899 -0.36174 2012 1 16 55942 0.1286 0.2894 -0.36283 2012 1 17 55943 0.1278 0.2888 -0.36382 2012 1 18 55944 0.1269 0.2883 -0.36462 2012 1 19 55945 0.1260 0.2878 -0.36523 2012 1 20 55946 0.1252 0.2873 -0.36575 2012 1 21 55947 0.1243 0.2869 -0.36628 2012 1 22 55948 0.1234 0.2864 -0.36687 2012 1 23 55949 0.1226 0.2860 -0.36762 2012 1 24 55950 0.1217 0.2855 -0.36857 2012 1 25 55951 0.1208 0.2851 -0.36961 2012 1 26 55952 0.1200 0.2847 -0.37072 2012 1 27 55953 0.1191 0.2843 -0.37181 2012 1 28 55954 0.1182 0.2840 -0.37284 2012 1 29 55955 0.1174 0.2836 -0.37382 2012 1 30 55956 0.1165 0.2832 -0.37470 2012 1 31 55957 0.1156 0.2829 -0.37544 2012 2 1 55958 0.1148 0.2826 -0.37607 2012 2 2 55959 0.1139 0.2823 -0.37661 2012 2 3 55960 0.1131 0.2820 -0.37709 2012 2 4 55961 0.1122 0.2817 -0.37759 2012 2 5 55962 0.1114 0.2814 -0.37812 2012 2 6 55963 0.1105 0.2811 -0.37874 2012 2 7 55964 0.1097 0.2809 -0.37949 2012 2 8 55965 0.1089 0.2807 -0.38044 2012 2 9 55966 0.1080 0.2804 -0.38160 2012 2 10 55967 0.1072 0.2802 -0.38291 2012 2 11 55968 0.1064 0.2800 -0.38428 2012 2 12 55969 0.1056 0.2798 -0.38561 2012 2 13 55970 0.1047 0.2797 -0.38678 2012 2 14 55971 0.1039 0.2795 -0.38773 2012 2 15 55972 0.1031 0.2793 -0.38847 2012 2 16 55973 0.1023 0.2792 -0.38908 2012 2 17 55974 0.1015 0.2791 -0.38971 2012 2 18 55975 0.1008 0.2789 -0.39036 2012 2 19 55976 0.1000 0.2788 -0.39120 2012 2 20 55977 0.0992 0.2787 -0.39225 2012 2 21 55978 0.0984 0.2787 -0.39344 2012 2 22 55979 0.0977 0.2786 -0.39473 2012 2 23 55980 0.0969 0.2785 -0.39597 2012 2 24 55981 0.0962 0.2785 -0.39714 2012 2 25 55982 0.0954 0.2784 -0.39816 2012 2 26 55983 0.0947 0.2784 -0.39907 2012 2 27 55984 0.0940 0.2784 -0.39990 2012 2 28 55985 0.0933 0.2784 -0.40063 2012 2 29 55986 0.0926 0.2784 -0.40131 2012 3 1 55987 0.0919 0.2784 -0.40194 2012 3 2 55988 0.0912 0.2784 -0.40256 2012 3 3 55989 0.0905 0.2784 -0.40321 2012 3 4 55990 0.0898 0.2784 -0.40395 2012 3 5 55991 0.0891 0.2785 -0.40491 2012 3 6 55992 0.0885 0.2785 -0.40611 2012 3 7 55993 0.0878 0.2786 -0.40755 2012 3 8 55994 0.0872 0.2787 -0.40920 2012 3 9 55995 0.0865 0.2788 -0.41094 2012 3 10 55996 0.0859 0.2789 -0.41263 2012 3 11 55997 0.0853 0.2790 -0.41423 2012 3 12 55998 0.0847 0.2791 -0.41563 2012 3 13 55999 0.0841 0.2792 -0.41679 2012 3 14 56000 0.0835 0.2793 -0.41777 2012 3 15 56001 0.0829 0.2794 -0.41867 2012 3 16 56002 0.0823 0.2796 -0.41956 2012 3 17 56003 0.0818 0.2797 -0.42052 2012 3 18 56004 0.0812 0.2799 -0.42158 2012 3 19 56005 0.0807 0.2800 -0.42274 2012 3 20 56006 0.0801 0.2802 -0.42400 2012 3 21 56007 0.0796 0.2804 -0.42530 2012 3 22 56008 0.0791 0.2805 -0.42666 2012 3 23 56009 0.0786 0.2807 -0.42806 2012 3 24 56010 0.0781 0.2809 -0.42936 2012 3 25 56011 0.0776 0.2811 -0.43056 2012 3 26 56012 0.0771 0.2813 -0.43168 2012 3 27 56013 0.0767 0.2815 -0.43277 2012 3 28 56014 0.0762 0.2817 -0.43386 2012 3 29 56015 0.0758 0.2820 -0.43494 2012 3 30 56016 0.0753 0.2822 -0.43605 2012 3 31 56017 0.0749 0.2824 -0.43725 2012 4 1 56018 0.0745 0.2827 -0.43854 2012 4 2 56019 0.0741 0.2829 -0.43999 2012 4 3 56020 0.0737 0.2831 -0.44161 2012 4 4 56021 0.0733 0.2834 -0.44347 2012 4 5 56022 0.0729 0.2836 -0.44550 2012 4 6 56023 0.0725 0.2839 -0.44762 2012 4 7 56024 0.0722 0.2842 -0.44973 2012 4 8 56025 0.0718 0.2844 -0.45169 2012 4 9 56026 0.0715 0.2847 -0.45346 2012 4 10 56027 0.0711 0.2850 -0.45503 2012 4 11 56028 0.0708 0.2852 -0.45647 2012 4 12 56029 0.0705 0.2855 -0.45794 2012 4 13 56030 0.0702 0.2858 -0.45956 2012 4 14 56031 0.0699 0.2861 -0.46130 2012 4 15 56032 0.0696 0.2864 -0.46304 2012 4 16 56033 0.0694 0.2867 -0.46482 2012 4 17 56034 0.0691 0.2869 -0.46667 2012 4 18 56035 0.0688 0.2872 -0.46855 2012 4 19 56036 0.0686 0.2875 -0.47042 2012 4 20 56037 0.0684 0.2878 -0.47217 2012 4 21 56038 0.0681 0.2881 -0.47375 2012 4 22 56039 0.0679 0.2884 -0.47519 2012 4 23 56040 0.0677 0.2887 -0.47647 2012 4 24 56041 0.0675 0.2890 -0.47759 2012 4 25 56042 0.0673 0.2893 -0.47864 2012 4 26 56043 0.0671 0.2897 -0.47963 2012 4 27 56044 0.0669 0.2900 -0.48063 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) 55660 -65.53 0.27 -11.32 0.13 55661 -65.75 0.27 -11.38 0.13 55662 -65.84 0.27 -11.38 0.13 55663 -65.72 0.74 -11.39 0.34 55664 -65.46 0.74 -11.48 0.34 55665 -65.23 0.74 -11.51 0.34 55666 -65.19 0.74 -11.30 0.34 IAU2000A Celestial Pole Offset Series MJD dX error dY error (msec. of arc) 55660 -0.134 0.107 -0.317 0.130 55661 -0.135 0.107 -0.299 0.130 55662 -0.142 0.107 -0.295 0.130 55663 -0.159 0.294 -0.294 0.340 55664 -0.179 0.294 -0.301 0.340 55665 -0.207 0.294 -0.296 0.340 55666 -0.240 0.294 -0.286 0.340 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.