********************************************************************** * * * I E R S B U L L E T I N - A * * * * Rapid Service/Prediction of Earth Orientation * ********************************************************************** 18 June 2020 Vol. XXXIII No. 025 ______________________________________________________________________ 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 02 May 2019 at 0000 UTC Beginning 1 January 2017: TAI-UTC = 37.000 000 seconds *********************************************************************** * * * Notice of Publication Web and FTP Shutdown: * * The US Naval Observatory's Rapid Service/Prediction Center web and * * FTP sites (at maia.usno.navy.mil and toshi.nofs.navy.mil) must * * undergo modernization and have been offline since 24 October 2019. * * The expected completion of work and return of service is no earlier * * than Autumn of 2020 . Please visit https://www.usno.navy.mil and * * submit a Requirements Form to the USNO Public Affairs Official * * (PAO) if the information you are seeking is not accessible via * * another means. If the Requirements Form is not available, please * * contact the USNO PAO Geoff Chester at email address directly * * geoff.chester@navy.mil or phone number 202 762 1438. * * * * Although the Bulletin A makes several references to maia, one * * should note that the paragraph above supercedes any information * * that is contained in the Bulletin A text. Because some users mis- * * takenly use Bulletin A (ser7.dat) instead of other formats (such as * * finals2000A.daily) for operational, machine-to-machine uses, we * * do not wish to change the spacing or text of the files. In the * * past, when spacings had changed, users had stated that any change * * to the Bulletin format outside of this remarks area had broken * * their operations. Therefore, we have not removed the old references * * to maia within the text of the Bulletin A (ser7.dat file). * * * * This shutdown has lead to the indefinite cessation of IERS * * Bulletin A distribution emails. If this occurs, current * * subscribers to the Bulletin A email distribution list may receive * * future mailings from a different address (if this service is * * restored). In the meantime, we will be unable to process email * * subscription/unsubscription requests. * * * * Until 31 Oct 2020, updated EOPs may be available at NASA's Archive * * of Space Geodesy Data anonymous FTP server at: * * ftp://cddis.gsfc.nasa.gov/pub/products/iers * * Daily EOP data may be uploaded here by 18:00 UTC, and * * Bulletin A EOP data may be available by 20:00 UTC. * * Users should please verify results obtained from this site; * * we cannot guarantee the integrity or timeliness of files provided * * at this mirror site. * * * * Please note that CDDIS is reporting that as of 31 Oct 2020, all * * unencrypted ftp service will be permanently discontinued at CDDIS. * * * * For other download options from CDDIS, such as HTTPS, please refer * * to the https://cddis.nasa.gov/About/CDDIS_File_Download_FAQ.html * * * * In addition, updated EOPs may be available at IERS: * * https://datacenter.iers.org/eop.php * * EOP data files are uploaded directly from USNO to this site each * * day. For further information, contact the IERS directly. * * * * Questions and enquiries about EOPs can be emailed to the * * following address: * * usn.ncr.navobsydc.mbx.eopcp@mail.mil * * * * 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 20 6 12 59012 0.13054 .00009 0.44082 .00009 -0.252687 0.000022 20 6 13 59013 0.13241 .00009 0.44083 .00009 -0.252090 0.000023 20 6 14 59014 0.13437 .00009 0.44070 .00009 -0.251572 0.000023 20 6 15 59015 0.13637 .00009 0.44043 .00009 -0.251137 0.000016 20 6 16 59016 0.13836 .00009 0.43991 .00009 -0.250715 0.000016 20 6 17 59017 0.14039 .00009 0.43935 .00009 -0.250247 0.000013 20 6 18 59018 0.14248 .00009 0.43883 .00009 -0.249673 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 = 0.1159 + 0.0142 cos A + 0.0959 sin A + 0.0152 cos C - 0.0024 sin C y = 0.3530 + 0.0885 cos A - 0.0154 sin A - 0.0024 cos C - 0.0152 sin C UT1-UTC = -0.2224 - 0.00013 (MJD - 59026) - (UT2-UT1) where A = 2*pi*(MJD-59018)/365.25 and C = 2*pi*(MJD-59018)/435. TAI-UTC(MJD 59019) = 37.0 The accuracy may be estimated from the expressions: S x,y = 0.00068 (MJD-59018)**0.80 S t = 0.00025 (MJD-59018)**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) 2020 6 19 59019 0.1446 0.4385 -0.24895 2020 6 20 59020 0.1467 0.4382 -0.24806 2020 6 21 59021 0.1488 0.4380 -0.24703 2020 6 22 59022 0.1507 0.4378 -0.24591 2020 6 23 59023 0.1526 0.4376 -0.24478 2020 6 24 59024 0.1543 0.4373 -0.24372 2020 6 25 59025 0.1560 0.4368 -0.24280 2020 6 26 59026 0.1577 0.4364 -0.24209 2020 6 27 59027 0.1594 0.4359 -0.24157 2020 6 28 59028 0.1611 0.4353 -0.24123 2020 6 29 59029 0.1629 0.4348 -0.24096 2020 6 30 59030 0.1645 0.4344 -0.24069 2020 7 1 59031 0.1661 0.4339 -0.24031 2020 7 2 59032 0.1677 0.4333 -0.23973 2020 7 3 59033 0.1692 0.4327 -0.23891 2020 7 4 59034 0.1707 0.4321 -0.23788 2020 7 5 59035 0.1721 0.4315 -0.23675 2020 7 6 59036 0.1736 0.4308 -0.23561 2020 7 7 59037 0.1750 0.4302 -0.23453 2020 7 8 59038 0.1764 0.4295 -0.23357 2020 7 9 59039 0.1778 0.4288 -0.23274 2020 7 10 59040 0.1792 0.4280 -0.23205 2020 7 11 59041 0.1805 0.4272 -0.23146 2020 7 12 59042 0.1818 0.4264 -0.23095 2020 7 13 59043 0.1831 0.4255 -0.23047 2020 7 14 59044 0.1844 0.4247 -0.22997 2020 7 15 59045 0.1857 0.4238 -0.22942 2020 7 16 59046 0.1870 0.4228 -0.22877 2020 7 17 59047 0.1883 0.4219 -0.22802 2020 7 18 59048 0.1895 0.4209 -0.22715 2020 7 19 59049 0.1907 0.4200 -0.22621 2020 7 20 59050 0.1919 0.4189 -0.22526 2020 7 21 59051 0.1931 0.4179 -0.22437 2020 7 22 59052 0.1943 0.4169 -0.22363 2020 7 23 59053 0.1954 0.4158 -0.22310 2020 7 24 59054 0.1966 0.4147 -0.22280 2020 7 25 59055 0.1977 0.4136 -0.22268 2020 7 26 59056 0.1988 0.4124 -0.22266 2020 7 27 59057 0.1999 0.4113 -0.22262 2020 7 28 59058 0.2010 0.4101 -0.22245 2020 7 29 59059 0.2020 0.4089 -0.22209 2020 7 30 59060 0.2030 0.4077 -0.22149 2020 7 31 59061 0.2040 0.4065 -0.22069 2020 8 1 59062 0.2050 0.4052 -0.21975 2020 8 2 59063 0.2060 0.4040 -0.21875 2020 8 3 59064 0.2069 0.4027 -0.21779 2020 8 4 59065 0.2078 0.4014 -0.21692 2020 8 5 59066 0.2087 0.4001 -0.21618 2020 8 6 59067 0.2095 0.3988 -0.21558 2020 8 7 59068 0.2104 0.3975 -0.21509 2020 8 8 59069 0.2112 0.3961 -0.21467 2020 8 9 59070 0.2119 0.3948 -0.21428 2020 8 10 59071 0.2127 0.3934 -0.21387 2020 8 11 59072 0.2134 0.3920 -0.21339 2020 8 12 59073 0.2141 0.3907 -0.21281 2020 8 13 59074 0.2148 0.3893 -0.21212 2020 8 14 59075 0.2154 0.3878 -0.21131 2020 8 15 59076 0.2160 0.3864 -0.21043 2020 8 16 59077 0.2166 0.3850 -0.20953 2020 8 17 59078 0.2172 0.3835 -0.20867 2020 8 18 59079 0.2177 0.3821 -0.20796 2020 8 19 59080 0.2182 0.3806 -0.20749 2020 8 20 59081 0.2186 0.3792 -0.20730 2020 8 21 59082 0.2191 0.3777 -0.20736 2020 8 22 59083 0.2195 0.3762 -0.20760 2020 8 23 59084 0.2199 0.3747 -0.20788 2020 8 24 59085 0.2202 0.3732 -0.20808 2020 8 25 59086 0.2205 0.3717 -0.20809 2020 8 26 59087 0.2208 0.3702 -0.20789 2020 8 27 59088 0.2211 0.3687 -0.20748 2020 8 28 59089 0.2213 0.3672 -0.20693 2020 8 29 59090 0.2215 0.3656 -0.20632 2020 8 30 59091 0.2217 0.3641 -0.20572 2020 8 31 59092 0.2218 0.3626 -0.20521 2020 9 1 59093 0.2219 0.3610 -0.20481 2020 9 2 59094 0.2220 0.3595 -0.20456 2020 9 3 59095 0.2221 0.3580 -0.20444 2020 9 4 59096 0.2221 0.3564 -0.20442 2020 9 5 59097 0.2221 0.3549 -0.20446 2020 9 6 59098 0.2221 0.3533 -0.20450 2020 9 7 59099 0.2220 0.3518 -0.20450 2020 9 8 59100 0.2219 0.3502 -0.20443 2020 9 9 59101 0.2218 0.3487 -0.20427 2020 9 10 59102 0.2216 0.3471 -0.20402 2020 9 11 59103 0.2214 0.3456 -0.20370 2020 9 12 59104 0.2212 0.3441 -0.20334 2020 9 13 59105 0.2210 0.3425 -0.20302 2020 9 14 59106 0.2207 0.3410 -0.20281 2020 9 15 59107 0.2204 0.3395 -0.20282 2020 9 16 59108 0.2201 0.3380 -0.20310 2020 9 17 59109 0.2197 0.3364 -0.20368 2020 9 18 59110 0.2193 0.3349 -0.20449 2020 9 19 59111 0.2189 0.3334 -0.20541 2020 9 20 59112 0.2184 0.3319 -0.20629 2020 9 21 59113 0.2180 0.3304 -0.20699 2020 9 22 59114 0.2174 0.3289 -0.20746 2020 9 23 59115 0.2169 0.3274 -0.20768 2020 9 24 59116 0.2163 0.3260 -0.20771 2020 9 25 59117 0.2157 0.3245 -0.20765 2020 9 26 59118 0.2151 0.3230 -0.20758 2020 9 27 59119 0.2145 0.3216 -0.20758 2020 9 28 59120 0.2138 0.3202 -0.20769 2020 9 29 59121 0.2131 0.3187 -0.20794 2020 9 30 59122 0.2124 0.3173 -0.20832 2020 10 1 59123 0.2116 0.3159 -0.20879 2020 10 2 59124 0.2108 0.3145 -0.20933 2020 10 3 59125 0.2100 0.3132 -0.20987 2020 10 4 59126 0.2092 0.3118 -0.21038 2020 10 5 59127 0.2083 0.3104 -0.21078 2020 10 6 59128 0.2074 0.3091 -0.21107 2020 10 7 59129 0.2065 0.3078 -0.21125 2020 10 8 59130 0.2055 0.3065 -0.21132 2020 10 9 59131 0.2046 0.3052 -0.21133 2020 10 10 59132 0.2036 0.3039 -0.21132 2020 10 11 59133 0.2025 0.3026 -0.21138 2020 10 12 59134 0.2015 0.3014 -0.21160 2020 10 13 59135 0.2004 0.3001 -0.21205 2020 10 14 59136 0.1993 0.2989 -0.21279 2020 10 15 59137 0.1982 0.2977 -0.21381 2020 10 16 59138 0.1971 0.2965 -0.21502 2020 10 17 59139 0.1959 0.2954 -0.21628 2020 10 18 59140 0.1947 0.2942 -0.21743 2020 10 19 59141 0.1935 0.2931 -0.21834 2020 10 20 59142 0.1923 0.2920 -0.21898 2020 10 21 59143 0.1911 0.2909 -0.21937 2020 10 22 59144 0.1898 0.2898 -0.21961 2020 10 23 59145 0.1885 0.2888 -0.21978 2020 10 24 59146 0.1872 0.2877 -0.21998 2020 10 25 59147 0.1859 0.2867 -0.22028 2020 10 26 59148 0.1845 0.2857 -0.22069 2020 10 27 59149 0.1832 0.2847 -0.22123 2020 10 28 59150 0.1818 0.2838 -0.22187 2020 10 29 59151 0.1804 0.2829 -0.22256 2020 10 30 59152 0.1789 0.2820 -0.22328 2020 10 31 59153 0.1775 0.2811 -0.22396 2020 11 1 59154 0.1760 0.2802 -0.22456 2020 11 2 59155 0.1746 0.2794 -0.22504 2020 11 3 59156 0.1731 0.2786 -0.22538 2020 11 4 59157 0.1716 0.2778 -0.22559 2020 11 5 59158 0.1701 0.2770 -0.22570 2020 11 6 59159 0.1685 0.2763 -0.22576 2020 11 7 59160 0.1670 0.2756 -0.22584 2020 11 8 59161 0.1654 0.2749 -0.22602 2020 11 9 59162 0.1638 0.2742 -0.22639 2020 11 10 59163 0.1622 0.2736 -0.22699 2020 11 11 59164 0.1606 0.2730 -0.22786 2020 11 12 59165 0.1590 0.2724 -0.22894 2020 11 13 59166 0.1574 0.2718 -0.23015 2020 11 14 59167 0.1558 0.2713 -0.23132 2020 11 15 59168 0.1541 0.2708 -0.23231 2020 11 16 59169 0.1525 0.2703 -0.23305 2020 11 17 59170 0.1508 0.2698 -0.23350 2020 11 18 59171 0.1491 0.2694 -0.23374 2020 11 19 59172 0.1475 0.2690 -0.23387 2020 11 20 59173 0.1458 0.2686 -0.23398 2020 11 21 59174 0.1441 0.2682 -0.23416 2020 11 22 59175 0.1424 0.2679 -0.23444 2020 11 23 59176 0.1407 0.2676 -0.23483 2020 11 24 59177 0.1389 0.2674 -0.23532 2020 11 25 59178 0.1372 0.2671 -0.23587 2020 11 26 59179 0.1355 0.2669 -0.23644 2020 11 27 59180 0.1338 0.2667 -0.23697 2020 11 28 59181 0.1320 0.2665 -0.23742 2020 11 29 59182 0.1303 0.2664 -0.23776 2020 11 30 59183 0.1286 0.2663 -0.23796 2020 12 1 59184 0.1268 0.2662 -0.23801 2020 12 2 59185 0.1251 0.2662 -0.23794 2020 12 3 59186 0.1233 0.2662 -0.23780 2020 12 4 59187 0.1216 0.2662 -0.23765 2020 12 5 59188 0.1199 0.2662 -0.23757 2020 12 6 59189 0.1181 0.2663 -0.23764 2020 12 7 59190 0.1164 0.2664 -0.23792 2020 12 8 59191 0.1146 0.2665 -0.23843 2020 12 9 59192 0.1129 0.2666 -0.23915 2020 12 10 59193 0.1112 0.2668 -0.24003 2020 12 11 59194 0.1094 0.2670 -0.24094 2020 12 12 59195 0.1077 0.2672 -0.24175 2020 12 13 59196 0.1060 0.2675 -0.24237 2020 12 14 59197 0.1042 0.2678 -0.24274 2020 12 15 59198 0.1025 0.2681 -0.24290 2020 12 16 59199 0.1008 0.2684 -0.24292 2020 12 17 59200 0.0991 0.2688 -0.24293 2020 12 18 59201 0.0974 0.2692 -0.24301 2020 12 19 59202 0.0957 0.2696 -0.24323 2020 12 20 59203 0.0941 0.2701 -0.24360 2020 12 21 59204 0.0924 0.2706 -0.24413 2020 12 22 59205 0.0907 0.2711 -0.24477 2020 12 23 59206 0.0891 0.2716 -0.24548 2020 12 24 59207 0.0874 0.2722 -0.24622 2020 12 25 59208 0.0858 0.2727 -0.24691 2020 12 26 59209 0.0842 0.2734 -0.24752 2020 12 27 59210 0.0826 0.2740 -0.24799 2020 12 28 59211 0.0810 0.2747 -0.24831 2020 12 29 59212 0.0794 0.2754 -0.24847 2020 12 30 59213 0.0778 0.2761 -0.24850 2020 12 31 59214 0.0763 0.2768 -0.24847 2021 1 1 59215 0.0747 0.2776 -0.24845 2021 1 2 59216 0.0732 0.2784 -0.24852 2021 1 3 59217 0.0717 0.2792 -0.24874 2021 1 4 59218 0.0702 0.2800 -0.24915 2021 1 5 59219 0.0687 0.2809 -0.24973 2021 1 6 59220 0.0672 0.2818 -0.25042 2021 1 7 59221 0.0658 0.2827 -0.25111 2021 1 8 59222 0.0643 0.2837 -0.25170 2021 1 9 59223 0.0629 0.2846 -0.25208 2021 1 10 59224 0.0615 0.2856 -0.25221 2021 1 11 59225 0.0601 0.2866 -0.25211 2021 1 12 59226 0.0588 0.2877 -0.25185 2021 1 13 59227 0.0574 0.2887 -0.25153 2021 1 14 59228 0.0561 0.2898 -0.25127 2021 1 15 59229 0.0548 0.2909 -0.25114 2021 1 16 59230 0.0535 0.2920 -0.25115 2021 1 17 59231 0.0523 0.2932 -0.25132 2021 1 18 59232 0.0510 0.2943 -0.25159 2021 1 19 59233 0.0498 0.2955 -0.25193 2021 1 20 59234 0.0486 0.2967 -0.25228 2021 1 21 59235 0.0475 0.2979 -0.25257 2021 1 22 59236 0.0463 0.2992 -0.25276 2021 1 23 59237 0.0452 0.3004 -0.25281 2021 1 24 59238 0.0441 0.3017 -0.25268 2021 1 25 59239 0.0430 0.3030 -0.25238 2021 1 26 59240 0.0419 0.3043 -0.25200 2021 1 27 59241 0.0409 0.3057 -0.25162 2021 1 28 59242 0.0399 0.3070 -0.25128 2021 1 29 59243 0.0389 0.3084 -0.25106 2021 1 30 59244 0.0380 0.3098 -0.25108 2021 1 31 59245 0.0371 0.3112 -0.25134 2021 2 1 59246 0.0362 0.3126 -0.25176 2021 2 2 59247 0.0353 0.3140 -0.25235 2021 2 3 59248 0.0344 0.3155 -0.25304 2021 2 4 59249 0.0336 0.3169 -0.25375 2021 2 5 59250 0.0328 0.3184 -0.25440 2021 2 6 59251 0.0321 0.3199 -0.25484 2021 2 7 59252 0.0313 0.3214 -0.25507 2021 2 8 59253 0.0306 0.3229 -0.25512 2021 2 9 59254 0.0299 0.3244 -0.25509 2021 2 10 59255 0.0293 0.3260 -0.25510 2021 2 11 59256 0.0287 0.3275 -0.25520 2021 2 12 59257 0.0281 0.3291 -0.25542 2021 2 13 59258 0.0275 0.3307 -0.25573 2021 2 14 59259 0.0270 0.3322 -0.25612 2021 2 15 59260 0.0265 0.3338 -0.25655 2021 2 16 59261 0.0260 0.3354 -0.25699 2021 2 17 59262 0.0256 0.3370 -0.25744 2021 2 18 59263 0.0251 0.3387 -0.25775 2021 2 19 59264 0.0248 0.3403 -0.25791 2021 2 20 59265 0.0244 0.3419 -0.25790 2021 2 21 59266 0.0241 0.3435 -0.25774 2021 2 22 59267 0.0238 0.3452 -0.25747 2021 2 23 59268 0.0235 0.3468 -0.25718 2021 2 24 59269 0.0233 0.3485 -0.25697 2021 2 25 59270 0.0231 0.3501 -0.25689 2021 2 26 59271 0.0229 0.3518 -0.25701 2021 2 27 59272 0.0228 0.3535 -0.25736 2021 2 28 59273 0.0227 0.3551 -0.25798 2021 3 1 59274 0.0226 0.3568 -0.25883 2021 3 2 59275 0.0226 0.3585 -0.25983 2021 3 3 59276 0.0225 0.3602 -0.26086 2021 3 4 59277 0.0226 0.3618 -0.26175 2021 3 5 59278 0.0226 0.3635 -0.26245 2021 3 6 59279 0.0227 0.3652 -0.26288 2021 3 7 59280 0.0228 0.3669 -0.26306 2021 3 8 59281 0.0230 0.3686 -0.26307 2021 3 9 59282 0.0231 0.3702 -0.26299 2021 3 10 59283 0.0233 0.3719 -0.26293 2021 3 11 59284 0.0236 0.3736 -0.26298 2021 3 12 59285 0.0238 0.3753 -0.26318 2021 3 13 59286 0.0241 0.3769 -0.26346 2021 3 14 59287 0.0245 0.3786 -0.26382 2021 3 15 59288 0.0248 0.3802 -0.26422 2021 3 16 59289 0.0252 0.3819 -0.26462 2021 3 17 59290 0.0257 0.3835 -0.26493 2021 3 18 59291 0.0261 0.3852 -0.26512 2021 3 19 59292 0.0266 0.3868 -0.26517 2021 3 20 59293 0.0271 0.3884 -0.26507 2021 3 21 59294 0.0277 0.3901 -0.26484 2021 3 22 59295 0.0282 0.3917 -0.26459 2021 3 23 59296 0.0289 0.3933 -0.26444 2021 3 24 59297 0.0295 0.3949 -0.26439 2021 3 25 59298 0.0302 0.3965 -0.26454 2021 3 26 59299 0.0309 0.3980 -0.26496 2021 3 27 59300 0.0316 0.3996 -0.26563 2021 3 28 59301 0.0323 0.4012 -0.26651 2021 3 29 59302 0.0331 0.4027 -0.26749 2021 3 30 59303 0.0339 0.4043 -0.26850 2021 3 31 59304 0.0348 0.4058 -0.26940 2021 4 1 59305 0.0357 0.4073 -0.27005 2021 4 2 59306 0.0366 0.4088 -0.27045 2021 4 3 59307 0.0375 0.4103 -0.27063 2021 4 4 59308 0.0384 0.4117 -0.27068 2021 4 5 59309 0.0394 0.4132 -0.27072 2021 4 6 59310 0.0404 0.4146 -0.27083 2021 4 7 59311 0.0415 0.4161 -0.27110 2021 4 8 59312 0.0425 0.4175 -0.27160 2021 4 9 59313 0.0436 0.4189 -0.27225 2021 4 10 59314 0.0448 0.4202 -0.27297 2021 4 11 59315 0.0459 0.4216 -0.27375 2021 4 12 59316 0.0471 0.4229 -0.27461 2021 4 13 59317 0.0483 0.4243 -0.27541 2021 4 14 59318 0.0495 0.4256 -0.27615 2021 4 15 59319 0.0507 0.4269 -0.27682 2021 4 16 59320 0.0520 0.4281 -0.27732 2021 4 17 59321 0.0533 0.4294 -0.27770 2021 4 18 59322 0.0546 0.4306 -0.27801 2021 4 19 59323 0.0559 0.4318 -0.27826 2021 4 20 59324 0.0573 0.4330 -0.27847 2021 4 21 59325 0.0587 0.4342 -0.27881 2021 4 22 59326 0.0601 0.4353 -0.27929 2021 4 23 59327 0.0615 0.4365 -0.27997 2021 4 24 59328 0.0629 0.4376 -0.28095 2021 4 25 59329 0.0644 0.4387 -0.28218 2021 4 26 59330 0.0659 0.4397 -0.28354 2021 4 27 59331 0.0674 0.4408 -0.28486 2021 4 28 59332 0.0689 0.4418 -0.28599 2021 4 29 59333 0.0705 0.4428 -0.28688 2021 4 30 59334 0.0720 0.4437 -0.28751 2021 5 1 59335 0.0736 0.4447 -0.28786 2021 5 2 59336 0.0752 0.4456 -0.28806 2021 5 3 59337 0.0768 0.4465 -0.28824 2021 5 4 59338 0.0785 0.4473 -0.28846 2021 5 5 59339 0.0801 0.4482 -0.28880 2021 5 6 59340 0.0818 0.4490 -0.28932 2021 5 7 59341 0.0834 0.4498 -0.28995 2021 5 8 59342 0.0851 0.4506 -0.29072 2021 5 9 59343 0.0869 0.4513 -0.29146 2021 5 10 59344 0.0886 0.4520 -0.29208 2021 5 11 59345 0.0903 0.4527 -0.29257 2021 5 12 59346 0.0921 0.4534 -0.29296 2021 5 13 59347 0.0938 0.4540 -0.29319 2021 5 14 59348 0.0956 0.4546 -0.29328 2021 5 15 59349 0.0974 0.4552 -0.29330 2021 5 16 59350 0.0992 0.4557 -0.29327 2021 5 17 59351 0.1010 0.4562 -0.29324 2021 5 18 59352 0.1028 0.4567 -0.29324 2021 5 19 59353 0.1046 0.4572 -0.29337 2021 5 20 59354 0.1064 0.4576 -0.29366 2021 5 21 59355 0.1083 0.4580 -0.29418 2021 5 22 59356 0.1101 0.4584 -0.29493 2021 5 23 59357 0.1120 0.4588 -0.29583 2021 5 24 59358 0.1139 0.4591 -0.29678 2021 5 25 59359 0.1157 0.4594 -0.29759 2021 5 26 59360 0.1176 0.4596 -0.29819 2021 5 27 59361 0.1195 0.4599 -0.29849 2021 5 28 59362 0.1214 0.4601 -0.29846 2021 5 29 59363 0.1232 0.4602 -0.29825 2021 5 30 59364 0.1251 0.4604 -0.29802 2021 5 31 59365 0.1270 0.4605 -0.29785 2021 6 1 59366 0.1289 0.4606 -0.29772 2021 6 2 59367 0.1308 0.4606 -0.29778 2021 6 3 59368 0.1327 0.4606 -0.29800 2021 6 4 59369 0.1346 0.4606 -0.29824 2021 6 5 59370 0.1365 0.4606 -0.29845 2021 6 6 59371 0.1384 0.4605 -0.29857 2021 6 7 59372 0.1403 0.4604 -0.29856 2021 6 8 59373 0.1422 0.4603 -0.29833 2021 6 9 59374 0.1441 0.4601 -0.29795 2021 6 10 59375 0.1460 0.4600 -0.29744 2021 6 11 59376 0.1479 0.4597 -0.29684 2021 6 12 59377 0.1497 0.4595 -0.29617 2021 6 13 59378 0.1516 0.4592 -0.29550 2021 6 14 59379 0.1535 0.4589 -0.29485 2021 6 15 59380 0.1554 0.4586 -0.29430 2021 6 16 59381 0.1572 0.4582 -0.29393 2021 6 17 59382 0.1591 0.4578 -0.29382 2021 6 18 59383 0.1609 0.4574 -0.29388 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) 58997 -106.78 0.25 -10.77 0.16 58998 -106.40 0.25 -10.82 0.16 IAU2000A Celestial Pole Offset Series MJD dX error dY error (msec. of arc) 58997 0.077 0.099 -0.127 0.163 58998 0.119 0.099 -0.154 0.163 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).