********************************************************************** * * * I E R S B U L L E T I N - A * * * * Rapid Service/Prediction of Earth Orientation * ********************************************************************** 9 July 2020 Vol. XXXIII No. 028 ______________________________________________________________________ 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 *********************************************************************** * * * There will NOT be a leap second introduced * * in UTC on 31 December 2020 * * * * 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 7 3 59033 0.17007 .00009 0.42999 .00009 -0.238606 0.000011 20 7 4 59034 0.17162 .00009 0.42882 .00009 -0.237500 0.000011 20 7 5 59035 0.17343 .00009 0.42744 .00009 -0.236217 0.000011 20 7 6 59036 0.17552 .00009 0.42609 .00009 -0.234874 0.000008 20 7 7 59037 0.17762 .00009 0.42483 .00009 -0.233581 0.000006 20 7 8 59038 0.17960 .00009 0.42343 .00009 -0.232389 0.000006 20 7 9 59039 0.18154 .00009 0.42190 .00009 -0.231289 0.000006 IERS Final Values MJD x y UT1-UTC " " s 20 5 2 58971 0.0776 0.4369 -0.24292 20 5 3 58972 0.0797 0.4381 -0.24363 20 5 4 58973 0.0815 0.4393 -0.24457 20 5 5 58974 0.0830 0.4404 -0.24567 20 5 6 58975 0.0844 0.4413 -0.24680 20 5 7 58976 0.0859 0.4422 -0.24784 20 5 8 58977 0.0876 0.4428 -0.24869 20 5 9 58978 0.0895 0.4435 -0.24931 20 5 10 58979 0.0916 0.4446 -0.24973 20 5 11 58980 0.0932 0.4456 -0.24999 20 5 12 58981 0.0946 0.4464 -0.25016 20 5 13 58982 0.0960 0.4468 -0.25036 20 5 14 58983 0.0972 0.4467 -0.25056 20 5 15 58984 0.0989 0.4463 -0.25076 20 5 16 58985 0.1003 0.4464 -0.25108 20 5 17 58986 0.1018 0.4461 -0.25148 20 5 18 58987 0.1030 0.4461 -0.25201 20 5 19 58988 0.1044 0.4458 -0.25261 20 5 20 58989 0.1061 0.4459 -0.25316 20 5 21 58990 0.1075 0.4463 -0.25362 20 5 22 58991 0.1083 0.4468 -0.25396 20 5 23 58992 0.1084 0.4471 -0.25415 20 5 24 58993 0.1085 0.4466 -0.25415 20 5 25 58994 0.1084 0.4460 -0.25401 20 5 26 58995 0.1083 0.4454 -0.25384 20 5 27 58996 0.1092 0.4444 -0.25368 20 5 28 58997 0.1102 0.4439 -0.25356 20 5 29 58998 0.1109 0.4434 -0.25355 20 5 30 58999 0.1120 0.4429 -0.25371 20 5 31 59000 0.1131 0.4424 -0.25409 20 6 1 59001 0.1141 0.4416 -0.25465 _______________________________________________________________________ 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 = 0.1261 + 0.0463 cos A + 0.0776 sin A + 0.0107 cos C - 0.0008 sin C y = 0.3530 + 0.0713 cos A - 0.0457 sin A - 0.0008 cos C - 0.0107 sin C UT1-UTC = -0.2137 - 0.00012 (MJD - 59047) - (UT2-UT1) where A = 2*pi*(MJD-59039)/365.25 and C = 2*pi*(MJD-59039)/435. TAI-UTC(MJD 59040) = 37.0 The accuracy may be estimated from the expressions: S x,y = 0.00068 (MJD-59039)**0.80 S t = 0.00025 (MJD-59039)**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 7 10 59040 0.1834 0.4206 -0.23025 2020 7 11 59041 0.1851 0.4193 -0.22927 2020 7 12 59042 0.1867 0.4181 -0.22831 2020 7 13 59043 0.1883 0.4170 -0.22735 2020 7 14 59044 0.1898 0.4159 -0.22634 2020 7 15 59045 0.1913 0.4148 -0.22525 2020 7 16 59046 0.1927 0.4137 -0.22405 2020 7 17 59047 0.1940 0.4126 -0.22273 2020 7 18 59048 0.1954 0.4115 -0.22130 2020 7 19 59049 0.1966 0.4104 -0.21978 2020 7 20 59050 0.1978 0.4093 -0.21825 2020 7 21 59051 0.1990 0.4081 -0.21681 2020 7 22 59052 0.2002 0.4070 -0.21555 2020 7 23 59053 0.2013 0.4058 -0.21453 2020 7 24 59054 0.2024 0.4046 -0.21375 2020 7 25 59055 0.2034 0.4034 -0.21318 2020 7 26 59056 0.2044 0.4022 -0.21274 2020 7 27 59057 0.2053 0.4010 -0.21232 2020 7 28 59058 0.2063 0.3998 -0.21180 2020 7 29 59059 0.2072 0.3985 -0.21110 2020 7 30 59060 0.2081 0.3973 -0.21018 2020 7 31 59061 0.2089 0.3960 -0.20907 2020 8 1 59062 0.2097 0.3947 -0.20785 2020 8 2 59063 0.2105 0.3934 -0.20658 2020 8 3 59064 0.2113 0.3921 -0.20534 2020 8 4 59065 0.2120 0.3908 -0.20419 2020 8 5 59066 0.2127 0.3894 -0.20318 2020 8 6 59067 0.2134 0.3881 -0.20232 2020 8 7 59068 0.2141 0.3867 -0.20160 2020 8 8 59069 0.2147 0.3853 -0.20098 2020 8 9 59070 0.2153 0.3839 -0.20042 2020 8 10 59071 0.2159 0.3825 -0.19987 2020 8 11 59072 0.2164 0.3811 -0.19928 2020 8 12 59073 0.2169 0.3797 -0.19863 2020 8 13 59074 0.2174 0.3783 -0.19790 2020 8 14 59075 0.2178 0.3769 -0.19708 2020 8 15 59076 0.2183 0.3754 -0.19621 2020 8 16 59077 0.2187 0.3740 -0.19532 2020 8 17 59078 0.2190 0.3725 -0.19450 2020 8 18 59079 0.2194 0.3711 -0.19384 2020 8 19 59080 0.2197 0.3696 -0.19341 2020 8 20 59081 0.2199 0.3681 -0.19327 2020 8 21 59082 0.2202 0.3667 -0.19339 2020 8 22 59083 0.2204 0.3652 -0.19367 2020 8 23 59084 0.2206 0.3637 -0.19399 2020 8 24 59085 0.2208 0.3622 -0.19422 2020 8 25 59086 0.2209 0.3607 -0.19426 2020 8 26 59087 0.2210 0.3592 -0.19407 2020 8 27 59088 0.2211 0.3577 -0.19368 2020 8 28 59089 0.2211 0.3562 -0.19312 2020 8 29 59090 0.2211 0.3547 -0.19250 2020 8 30 59091 0.2211 0.3532 -0.19188 2020 8 31 59092 0.2211 0.3517 -0.19134 2020 9 1 59093 0.2210 0.3502 -0.19092 2020 9 2 59094 0.2209 0.3487 -0.19063 2020 9 3 59095 0.2208 0.3471 -0.19048 2020 9 4 59096 0.2206 0.3456 -0.19044 2020 9 5 59097 0.2204 0.3441 -0.19046 2020 9 6 59098 0.2202 0.3426 -0.19050 2020 9 7 59099 0.2200 0.3411 -0.19049 2020 9 8 59100 0.2197 0.3396 -0.19040 2020 9 9 59101 0.2194 0.3381 -0.19021 2020 9 10 59102 0.2190 0.3366 -0.18991 2020 9 11 59103 0.2187 0.3352 -0.18952 2020 9 12 59104 0.2183 0.3337 -0.18908 2020 9 13 59105 0.2179 0.3322 -0.18865 2020 9 14 59106 0.2174 0.3307 -0.18832 2020 9 15 59107 0.2169 0.3293 -0.18820 2020 9 16 59108 0.2164 0.3278 -0.18835 2020 9 17 59109 0.2159 0.3263 -0.18880 2020 9 18 59110 0.2153 0.3249 -0.18949 2020 9 19 59111 0.2147 0.3235 -0.19030 2020 9 20 59112 0.2141 0.3220 -0.19108 2020 9 21 59113 0.2134 0.3206 -0.19169 2020 9 22 59114 0.2128 0.3192 -0.19207 2020 9 23 59115 0.2121 0.3178 -0.19221 2020 9 24 59116 0.2113 0.3164 -0.19216 2020 9 25 59117 0.2106 0.3150 -0.19202 2020 9 26 59118 0.2098 0.3137 -0.19187 2020 9 27 59119 0.2090 0.3123 -0.19180 2020 9 28 59120 0.2081 0.3110 -0.19184 2020 9 29 59121 0.2073 0.3096 -0.19202 2020 9 30 59122 0.2064 0.3083 -0.19234 2020 10 1 59123 0.2055 0.3070 -0.19276 2020 10 2 59124 0.2045 0.3057 -0.19324 2020 10 3 59125 0.2036 0.3044 -0.19373 2020 10 4 59126 0.2026 0.3032 -0.19418 2020 10 5 59127 0.2016 0.3019 -0.19455 2020 10 6 59128 0.2005 0.3007 -0.19482 2020 10 7 59129 0.1994 0.2995 -0.19496 2020 10 8 59130 0.1984 0.2983 -0.19501 2020 10 9 59131 0.1972 0.2971 -0.19499 2020 10 10 59132 0.1961 0.2959 -0.19497 2020 10 11 59133 0.1950 0.2948 -0.19502 2020 10 12 59134 0.1938 0.2936 -0.19523 2020 10 13 59135 0.1926 0.2925 -0.19569 2020 10 14 59136 0.1914 0.2914 -0.19645 2020 10 15 59137 0.1901 0.2903 -0.19749 2020 10 16 59138 0.1888 0.2893 -0.19874 2020 10 17 59139 0.1876 0.2882 -0.20003 2020 10 18 59140 0.1862 0.2872 -0.20121 2020 10 19 59141 0.1849 0.2862 -0.20216 2020 10 20 59142 0.1836 0.2852 -0.20282 2020 10 21 59143 0.1822 0.2843 -0.20323 2020 10 22 59144 0.1808 0.2833 -0.20349 2020 10 23 59145 0.1794 0.2824 -0.20368 2020 10 24 59146 0.1780 0.2815 -0.20391 2020 10 25 59147 0.1766 0.2807 -0.20424 2020 10 26 59148 0.1751 0.2798 -0.20462 2020 10 27 59149 0.1736 0.2790 -0.20512 2020 10 28 59150 0.1721 0.2782 -0.20573 2020 10 29 59151 0.1706 0.2774 -0.20640 2020 10 30 59152 0.1691 0.2766 -0.20710 2020 10 31 59153 0.1676 0.2759 -0.20776 2020 11 1 59154 0.1660 0.2752 -0.20835 2020 11 2 59155 0.1645 0.2745 -0.20881 2020 11 3 59156 0.1629 0.2738 -0.20914 2020 11 4 59157 0.1613 0.2732 -0.20935 2020 11 5 59158 0.1597 0.2726 -0.20946 2020 11 6 59159 0.1581 0.2720 -0.20952 2020 11 7 59160 0.1565 0.2714 -0.20960 2020 11 8 59161 0.1548 0.2709 -0.20978 2020 11 9 59162 0.1532 0.2703 -0.21015 2020 11 10 59163 0.1515 0.2699 -0.21076 2020 11 11 59164 0.1498 0.2694 -0.21164 2020 11 12 59165 0.1482 0.2690 -0.21274 2020 11 13 59166 0.1465 0.2685 -0.21396 2020 11 14 59167 0.1448 0.2682 -0.21515 2020 11 15 59168 0.1431 0.2678 -0.21617 2020 11 16 59169 0.1414 0.2675 -0.21693 2020 11 17 59170 0.1397 0.2672 -0.21742 2020 11 18 59171 0.1379 0.2669 -0.21769 2020 11 19 59172 0.1362 0.2666 -0.21785 2020 11 20 59173 0.1345 0.2664 -0.21800 2020 11 21 59174 0.1327 0.2662 -0.21822 2020 11 22 59175 0.1310 0.2660 -0.21854 2020 11 23 59176 0.1292 0.2659 -0.21899 2020 11 24 59177 0.1275 0.2658 -0.21952 2020 11 25 59178 0.1257 0.2657 -0.22012 2020 11 26 59179 0.1240 0.2656 -0.22073 2020 11 27 59180 0.1222 0.2656 -0.22132 2020 11 28 59181 0.1205 0.2656 -0.22183 2020 11 29 59182 0.1187 0.2656 -0.22222 2020 11 30 59183 0.1170 0.2657 -0.22247 2020 12 1 59184 0.1152 0.2658 -0.22258 2020 12 2 59185 0.1135 0.2659 -0.22257 2020 12 3 59186 0.1117 0.2660 -0.22248 2020 12 4 59187 0.1099 0.2662 -0.22239 2020 12 5 59188 0.1082 0.2663 -0.22237 2020 12 6 59189 0.1065 0.2666 -0.22250 2020 12 7 59190 0.1047 0.2668 -0.22282 2020 12 8 59191 0.1030 0.2671 -0.22338 2020 12 9 59192 0.1012 0.2674 -0.22415 2020 12 10 59193 0.0995 0.2677 -0.22507 2020 12 11 59194 0.0978 0.2681 -0.22601 2020 12 12 59195 0.0961 0.2685 -0.22686 2020 12 13 59196 0.0944 0.2689 -0.22749 2020 12 14 59197 0.0927 0.2693 -0.22787 2020 12 15 59198 0.0910 0.2698 -0.22802 2020 12 16 59199 0.0893 0.2703 -0.22801 2020 12 17 59200 0.0876 0.2708 -0.22797 2020 12 18 59201 0.0859 0.2713 -0.22796 2020 12 19 59202 0.0843 0.2719 -0.22807 2020 12 20 59203 0.0826 0.2725 -0.22828 2020 12 21 59204 0.0810 0.2731 -0.22861 2020 12 22 59205 0.0794 0.2738 -0.22900 2020 12 23 59206 0.0778 0.2745 -0.22941 2020 12 24 59207 0.0762 0.2752 -0.22980 2020 12 25 59208 0.0746 0.2759 -0.23013 2020 12 26 59209 0.0730 0.2766 -0.23034 2020 12 27 59210 0.0714 0.2774 -0.23042 2020 12 28 59211 0.0699 0.2782 -0.23036 2020 12 29 59212 0.0684 0.2791 -0.23018 2020 12 30 59213 0.0669 0.2799 -0.22991 2020 12 31 59214 0.0654 0.2808 -0.22963 2021 1 1 59215 0.0639 0.2817 -0.22940 2021 1 2 59216 0.0624 0.2826 -0.22931 2021 1 3 59217 0.0610 0.2836 -0.22942 2021 1 4 59218 0.0595 0.2845 -0.22975 2021 1 5 59219 0.0581 0.2855 -0.23030 2021 1 6 59220 0.0567 0.2866 -0.23100 2021 1 7 59221 0.0553 0.2876 -0.23176 2021 1 8 59222 0.0540 0.2887 -0.23247 2021 1 9 59223 0.0526 0.2898 -0.23303 2021 1 10 59224 0.0513 0.2909 -0.23339 2021 1 11 59225 0.0500 0.2920 -0.23356 2021 1 12 59226 0.0488 0.2932 -0.23360 2021 1 13 59227 0.0475 0.2943 -0.23361 2021 1 14 59228 0.0463 0.2955 -0.23368 2021 1 15 59229 0.0451 0.2967 -0.23390 2021 1 16 59230 0.0439 0.2980 -0.23427 2021 1 17 59231 0.0427 0.2992 -0.23479 2021 1 18 59232 0.0416 0.3005 -0.23543 2021 1 19 59233 0.0404 0.3018 -0.23612 2021 1 20 59234 0.0393 0.3031 -0.23681 2021 1 21 59235 0.0383 0.3044 -0.23745 2021 1 22 59236 0.0372 0.3058 -0.23801 2021 1 23 59237 0.0362 0.3072 -0.23844 2021 1 24 59238 0.0352 0.3085 -0.23873 2021 1 25 59239 0.0343 0.3099 -0.23888 2021 1 26 59240 0.0333 0.3113 -0.23890 2021 1 27 59241 0.0324 0.3128 -0.23883 2021 1 28 59242 0.0315 0.3142 -0.23876 2021 1 29 59243 0.0306 0.3157 -0.23877 2021 1 30 59244 0.0298 0.3172 -0.23898 2021 1 31 59245 0.0290 0.3186 -0.23944 2021 2 1 59246 0.0282 0.3201 -0.24016 2021 2 2 59247 0.0275 0.3217 -0.24107 2021 2 3 59248 0.0267 0.3232 -0.24208 2021 2 4 59249 0.0260 0.3247 -0.24305 2021 2 5 59250 0.0254 0.3263 -0.24388 2021 2 6 59251 0.0247 0.3279 -0.24448 2021 2 7 59252 0.0241 0.3294 -0.24486 2021 2 8 59253 0.0236 0.3310 -0.24504 2021 2 9 59254 0.0230 0.3326 -0.24511 2021 2 10 59255 0.0225 0.3342 -0.24514 2021 2 11 59256 0.0220 0.3358 -0.24523 2021 2 12 59257 0.0215 0.3375 -0.24540 2021 2 13 59258 0.0211 0.3391 -0.24568 2021 2 14 59259 0.0207 0.3407 -0.24603 2021 2 15 59260 0.0203 0.3424 -0.24641 2021 2 16 59261 0.0200 0.3441 -0.24681 2021 2 17 59262 0.0197 0.3457 -0.24719 2021 2 18 59263 0.0194 0.3474 -0.24752 2021 2 19 59264 0.0192 0.3491 -0.24775 2021 2 20 59265 0.0190 0.3507 -0.24783 2021 2 21 59266 0.0188 0.3524 -0.24779 2021 2 22 59267 0.0186 0.3541 -0.24764 2021 2 23 59268 0.0185 0.3558 -0.24751 2021 2 24 59269 0.0184 0.3575 -0.24746 2021 2 25 59270 0.0184 0.3592 -0.24753 2021 2 26 59271 0.0183 0.3609 -0.24776 2021 2 27 59272 0.0183 0.3626 -0.24825 2021 2 28 59273 0.0184 0.3643 -0.24902 2021 3 1 59274 0.0185 0.3660 -0.25005 2021 3 2 59275 0.0186 0.3677 -0.25121 2021 3 3 59276 0.0187 0.3694 -0.25233 2021 3 4 59277 0.0189 0.3711 -0.25328 2021 3 5 59278 0.0191 0.3728 -0.25401 2021 3 6 59279 0.0193 0.3745 -0.25448 2021 3 7 59280 0.0195 0.3762 -0.25468 2021 3 8 59281 0.0198 0.3779 -0.25472 2021 3 9 59282 0.0202 0.3796 -0.25477 2021 3 10 59283 0.0205 0.3813 -0.25494 2021 3 11 59284 0.0209 0.3830 -0.25522 2021 3 12 59285 0.0213 0.3846 -0.25565 2021 3 13 59286 0.0218 0.3863 -0.25626 2021 3 14 59287 0.0222 0.3880 -0.25696 2021 3 15 59288 0.0228 0.3896 -0.25764 2021 3 16 59289 0.0233 0.3913 -0.25831 2021 3 17 59290 0.0239 0.3929 -0.25893 2021 3 18 59291 0.0245 0.3946 -0.25952 2021 3 19 59292 0.0251 0.3962 -0.26006 2021 3 20 59293 0.0258 0.3978 -0.26046 2021 3 21 59294 0.0265 0.3994 -0.26074 2021 3 22 59295 0.0272 0.4010 -0.26093 2021 3 23 59296 0.0280 0.4026 -0.26112 2021 3 24 59297 0.0287 0.4042 -0.26139 2021 3 25 59298 0.0296 0.4058 -0.26181 2021 3 26 59299 0.0304 0.4073 -0.26243 2021 3 27 59300 0.0313 0.4089 -0.26327 2021 3 28 59301 0.0322 0.4104 -0.26433 2021 3 29 59302 0.0331 0.4119 -0.26552 2021 3 30 59303 0.0341 0.4134 -0.26673 2021 3 31 59304 0.0350 0.4149 -0.26787 2021 4 1 59305 0.0361 0.4164 -0.26871 2021 4 2 59306 0.0371 0.4179 -0.26924 2021 4 3 59307 0.0382 0.4193 -0.26949 2021 4 4 59308 0.0393 0.4208 -0.26954 2021 4 5 59309 0.0404 0.4222 -0.26954 2021 4 6 59310 0.0415 0.4236 -0.26959 2021 4 7 59311 0.0427 0.4250 -0.26980 2021 4 8 59312 0.0439 0.4263 -0.27019 2021 4 9 59313 0.0451 0.4277 -0.27070 2021 4 10 59314 0.0464 0.4290 -0.27128 2021 4 11 59315 0.0477 0.4303 -0.27190 2021 4 12 59316 0.0490 0.4316 -0.27254 2021 4 13 59317 0.0503 0.4329 -0.27317 2021 4 14 59318 0.0516 0.4341 -0.27372 2021 4 15 59319 0.0530 0.4354 -0.27415 2021 4 16 59320 0.0544 0.4366 -0.27445 2021 4 17 59321 0.0558 0.4378 -0.27457 2021 4 18 59322 0.0573 0.4390 -0.27454 2021 4 19 59323 0.0587 0.4401 -0.27439 2021 4 20 59324 0.0602 0.4412 -0.27417 2021 4 21 59325 0.0617 0.4423 -0.27401 2021 4 22 59326 0.0632 0.4434 -0.27401 2021 4 23 59327 0.0648 0.4445 -0.27425 2021 4 24 59328 0.0663 0.4455 -0.27471 2021 4 25 59329 0.0679 0.4465 -0.27536 2021 4 26 59330 0.0695 0.4475 -0.27612 2021 4 27 59331 0.0711 0.4485 -0.27685 2021 4 28 59332 0.0728 0.4494 -0.27737 2021 4 29 59333 0.0744 0.4503 -0.27760 2021 4 30 59334 0.0761 0.4512 -0.27753 2021 5 1 59335 0.0778 0.4521 -0.27725 2021 5 2 59336 0.0795 0.4529 -0.27683 2021 5 3 59337 0.0812 0.4537 -0.27647 2021 5 4 59338 0.0830 0.4545 -0.27630 2021 5 5 59339 0.0847 0.4553 -0.27628 2021 5 6 59340 0.0865 0.4560 -0.27642 2021 5 7 59341 0.0883 0.4567 -0.27669 2021 5 8 59342 0.0900 0.4574 -0.27697 2021 5 9 59343 0.0919 0.4580 -0.27718 2021 5 10 59344 0.0937 0.4587 -0.27727 2021 5 11 59345 0.0955 0.4593 -0.27722 2021 5 12 59346 0.0973 0.4598 -0.27704 2021 5 13 59347 0.0992 0.4604 -0.27668 2021 5 14 59348 0.1010 0.4609 -0.27617 2021 5 15 59349 0.1029 0.4614 -0.27557 2021 5 16 59350 0.1048 0.4618 -0.27492 2021 5 17 59351 0.1067 0.4622 -0.27429 2021 5 18 59352 0.1086 0.4626 -0.27376 2021 5 19 59353 0.1105 0.4630 -0.27342 2021 5 20 59354 0.1124 0.4633 -0.27337 2021 5 21 59355 0.1143 0.4637 -0.27358 2021 5 22 59356 0.1162 0.4639 -0.27398 2021 5 23 59357 0.1181 0.4642 -0.27456 2021 5 24 59358 0.1201 0.4644 -0.27525 2021 5 25 59359 0.1220 0.4646 -0.27584 2021 5 26 59360 0.1239 0.4647 -0.27624 2021 5 27 59361 0.1259 0.4649 -0.27644 2021 5 28 59362 0.1278 0.4650 -0.27635 2021 5 29 59363 0.1298 0.4650 -0.27613 2021 5 30 59364 0.1317 0.4651 -0.27591 2021 5 31 59365 0.1337 0.4651 -0.27572 2021 6 1 59366 0.1356 0.4651 -0.27560 2021 6 2 59367 0.1376 0.4650 -0.27562 2021 6 3 59368 0.1395 0.4649 -0.27569 2021 6 4 59369 0.1414 0.4648 -0.27576 2021 6 5 59370 0.1434 0.4647 -0.27585 2021 6 6 59371 0.1453 0.4645 -0.27591 2021 6 7 59372 0.1473 0.4643 -0.27589 2021 6 8 59373 0.1492 0.4641 -0.27571 2021 6 9 59374 0.1511 0.4638 -0.27538 2021 6 10 59375 0.1530 0.4635 -0.27494 2021 6 11 59376 0.1550 0.4632 -0.27436 2021 6 12 59377 0.1569 0.4628 -0.27364 2021 6 13 59378 0.1588 0.4624 -0.27286 2021 6 14 59379 0.1607 0.4620 -0.27209 2021 6 15 59380 0.1626 0.4616 -0.27140 2021 6 16 59381 0.1645 0.4611 -0.27090 2021 6 17 59382 0.1663 0.4606 -0.27066 2021 6 18 59383 0.1682 0.4601 -0.27065 2021 6 19 59384 0.1700 0.4595 -0.27091 2021 6 20 59385 0.1719 0.4589 -0.27123 2021 6 21 59386 0.1737 0.4583 -0.27144 2021 6 22 59387 0.1755 0.4576 -0.27146 2021 6 23 59388 0.1773 0.4570 -0.27129 2021 6 24 59389 0.1791 0.4563 -0.27087 2021 6 25 59390 0.1809 0.4555 -0.27028 2021 6 26 59391 0.1827 0.4548 -0.26968 2021 6 27 59392 0.1845 0.4540 -0.26915 2021 6 28 59393 0.1862 0.4531 -0.26874 2021 6 29 59394 0.1879 0.4523 -0.26846 2021 6 30 59395 0.1896 0.4514 -0.26828 2021 7 1 59396 0.1913 0.4505 -0.26814 2021 7 2 59397 0.1930 0.4496 -0.26801 2021 7 3 59398 0.1947 0.4486 -0.26782 2021 7 4 59399 0.1963 0.4477 -0.26753 2021 7 5 59400 0.1979 0.4466 -0.26712 2021 7 6 59401 0.1995 0.4456 -0.26654 2021 7 7 59402 0.2011 0.4446 -0.26583 2021 7 8 59403 0.2027 0.4435 -0.26498 2021 7 9 59404 0.2042 0.4424 -0.26396 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) 59017 -108.95 0.79 -9.77 0.13 59018 -109.36 0.79 -9.69 0.13 59019 -109.61 0.79 -9.83 0.13 59020 -109.70 0.56 -10.12 0.10 59021 -109.67 0.50 -10.37 0.11 59022 -109.64 0.50 -10.47 0.11 59023 -109.73 0.47 -10.43 0.12 IERS Celestial Pole Offset Final Series MJD dpsi deps (msec. of arc) 58971 -104.7 -10.6 58972 -104.5 -10.6 58973 -104.5 -10.5 58974 -104.8 -10.2 58975 -105.5 -10.2 58976 -106.2 -10.3 58977 -106.6 -10.4 58978 -106.6 -10.4 58979 -106.2 -10.3 58980 -105.8 -10.4 58981 -105.6 -10.6 58982 -105.6 -10.8 58983 -105.7 -10.8 58984 -105.6 -10.7 58985 -105.4 -10.5 58986 -105.4 -10.3 58987 -105.7 -10.2 58988 -106.2 -9.9 58989 -106.5 -9.8 58990 -106.6 -9.9 58991 -106.5 -10.2 58992 -106.4 -10.5 58993 -106.4 -10.6 58994 -106.5 -10.6 58995 -106.7 -10.5 58996 -107.0 -10.5 58997 -106.8 -10.7 58998 -106.2 -10.9 58999 -105.8 -10.8 59000 -105.6 -10.6 59001 -105.9 -10.2 IAU2000A Celestial Pole Offset Series MJD dX error dY error (msec. of arc) 59017 0.261 0.314 -0.013 0.126 59018 0.260 0.314 -0.025 0.126 59019 0.253 0.314 -0.041 0.126 59020 0.243 0.223 -0.058 0.101 59021 0.230 0.198 -0.075 0.114 59022 0.216 0.198 -0.093 0.114 59023 0.201 0.187 -0.111 0.118 IAU2000A Celestial Pole Offset Final Series MJD dX dY (msec. of arc) 58971 0.10 0.02 58972 0.10 0.03 58973 0.10 0.04 58974 0.10 0.05 58975 0.07 0.02 58976 0.03 -0.01 58977 -0.00 -0.05 58978 -0.02 -0.02 58979 -0.03 0.02 58980 -0.03 0.06 58981 -0.04 0.11 58982 0.02 0.06 58983 0.09 -0.01 58984 0.17 -0.09 58985 0.14 -0.08 58986 0.07 -0.04 58987 0.01 0.01 58988 -0.06 0.05 58989 -0.02 0.02 58990 0.04 -0.03 58991 0.10 -0.07 58992 0.09 -0.05 58993 0.06 -0.01 58994 0.03 0.04 58995 0.00 0.09 58996 -0.03 0.13 58997 0.07 -0.01 58998 0.19 -0.20 58999 0.19 -0.20 59000 0.14 -0.14 59001 0.09 -0.08 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).