********************************************************************** * * * I E R S B U L L E T I N - A * * * * Rapid Service/Prediction of Earth Orientation * ********************************************************************** 23 July 2020 Vol. XXXIII No. 030 ______________________________________________________________________ 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 17 59047 0.19218 .00009 0.41290 .00009 -0.222453 0.000011 20 7 18 59048 0.19319 .00009 0.41190 .00009 -0.221114 0.000018 20 7 19 59049 0.19388 .00009 0.41076 .00009 -0.219692 0.000016 20 7 20 59050 0.19435 .00009 0.40949 .00009 -0.218231 0.000012 20 7 21 59051 0.19473 .00009 0.40818 .00009 -0.216873 0.000012 20 7 22 59052 0.19514 .00009 0.40671 .00009 -0.215718 0.000011 20 7 23 59053 0.19558 .00009 0.40525 .00009 -0.214772 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 = 0.1219 + 0.0648 cos A + 0.0637 sin A + 0.0089 cos C - 0.0031 sin C y = 0.3527 + 0.0577 cos A - 0.0628 sin A - 0.0031 cos C - 0.0089 sin C UT1-UTC = -0.2090 - 0.00011 (MJD - 59061) - (UT2-UT1) where A = 2*pi*(MJD-59053)/365.25 and C = 2*pi*(MJD-59053)/435. TAI-UTC(MJD 59054) = 37.0 The accuracy may be estimated from the expressions: S x,y = 0.00068 (MJD-59053)**0.80 S t = 0.00025 (MJD-59053)**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 24 59054 0.1962 0.4038 -0.21401 2020 7 25 59055 0.1968 0.4025 -0.21342 2020 7 26 59056 0.1974 0.4012 -0.21291 2020 7 27 59057 0.1981 0.3999 -0.21242 2020 7 28 59058 0.1988 0.3987 -0.21184 2020 7 29 59059 0.1995 0.3974 -0.21113 2020 7 30 59060 0.2002 0.3962 -0.21025 2020 7 31 59061 0.2009 0.3949 -0.20919 2020 8 1 59062 0.2016 0.3936 -0.20799 2020 8 2 59063 0.2023 0.3924 -0.20669 2020 8 3 59064 0.2030 0.3911 -0.20538 2020 8 4 59065 0.2037 0.3898 -0.20414 2020 8 5 59066 0.2043 0.3886 -0.20303 2020 8 6 59067 0.2050 0.3874 -0.20206 2020 8 7 59068 0.2056 0.3861 -0.20120 2020 8 8 59069 0.2061 0.3848 -0.20039 2020 8 9 59070 0.2067 0.3836 -0.19959 2020 8 10 59071 0.2072 0.3823 -0.19876 2020 8 11 59072 0.2077 0.3810 -0.19787 2020 8 12 59073 0.2082 0.3797 -0.19690 2020 8 13 59074 0.2087 0.3784 -0.19584 2020 8 14 59075 0.2092 0.3771 -0.19468 2020 8 15 59076 0.2096 0.3758 -0.19346 2020 8 16 59077 0.2100 0.3745 -0.19223 2020 8 17 59078 0.2104 0.3732 -0.19106 2020 8 18 59079 0.2107 0.3718 -0.19005 2020 8 19 59080 0.2111 0.3705 -0.18927 2020 8 20 59081 0.2114 0.3691 -0.18876 2020 8 21 59082 0.2116 0.3678 -0.18851 2020 8 22 59083 0.2119 0.3665 -0.18844 2020 8 23 59084 0.2121 0.3651 -0.18841 2020 8 24 59085 0.2123 0.3637 -0.18830 2020 8 25 59086 0.2125 0.3624 -0.18801 2020 8 26 59087 0.2126 0.3610 -0.18750 2020 8 27 59088 0.2127 0.3596 -0.18681 2020 8 28 59089 0.2128 0.3583 -0.18600 2020 8 29 59090 0.2129 0.3569 -0.18514 2020 8 30 59091 0.2129 0.3555 -0.18432 2020 8 31 59092 0.2129 0.3541 -0.18361 2020 9 1 59093 0.2129 0.3528 -0.18305 2020 9 2 59094 0.2128 0.3514 -0.18264 2020 9 3 59095 0.2128 0.3500 -0.18239 2020 9 4 59096 0.2127 0.3486 -0.18226 2020 9 5 59097 0.2125 0.3472 -0.18220 2020 9 6 59098 0.2124 0.3459 -0.18217 2020 9 7 59099 0.2122 0.3445 -0.18211 2020 9 8 59100 0.2120 0.3431 -0.18198 2020 9 9 59101 0.2117 0.3417 -0.18176 2020 9 10 59102 0.2114 0.3404 -0.18145 2020 9 11 59103 0.2111 0.3390 -0.18107 2020 9 12 59104 0.2108 0.3376 -0.18066 2020 9 13 59105 0.2105 0.3363 -0.18026 2020 9 14 59106 0.2101 0.3349 -0.17997 2020 9 15 59107 0.2097 0.3336 -0.17989 2020 9 16 59108 0.2092 0.3322 -0.18009 2020 9 17 59109 0.2088 0.3309 -0.18058 2020 9 18 59110 0.2083 0.3295 -0.18129 2020 9 19 59111 0.2078 0.3282 -0.18212 2020 9 20 59112 0.2072 0.3269 -0.18289 2020 9 21 59113 0.2066 0.3256 -0.18350 2020 9 22 59114 0.2060 0.3243 -0.18385 2020 9 23 59115 0.2054 0.3230 -0.18395 2020 9 24 59116 0.2048 0.3217 -0.18386 2020 9 25 59117 0.2041 0.3204 -0.18369 2020 9 26 59118 0.2034 0.3191 -0.18351 2020 9 27 59119 0.2027 0.3179 -0.18341 2020 9 28 59120 0.2019 0.3166 -0.18342 2020 9 29 59121 0.2011 0.3154 -0.18357 2020 9 30 59122 0.2003 0.3141 -0.18386 2020 10 1 59123 0.1995 0.3129 -0.18424 2020 10 2 59124 0.1987 0.3117 -0.18468 2020 10 3 59125 0.1978 0.3105 -0.18513 2020 10 4 59126 0.1969 0.3093 -0.18554 2020 10 5 59127 0.1959 0.3082 -0.18585 2020 10 6 59128 0.1950 0.3070 -0.18606 2020 10 7 59129 0.1940 0.3059 -0.18615 2020 10 8 59130 0.1930 0.3047 -0.18614 2020 10 9 59131 0.1920 0.3036 -0.18606 2020 10 10 59132 0.1910 0.3025 -0.18598 2020 10 11 59133 0.1899 0.3015 -0.18596 2020 10 12 59134 0.1888 0.3004 -0.18611 2020 10 13 59135 0.1877 0.2993 -0.18650 2020 10 14 59136 0.1866 0.2983 -0.18718 2020 10 15 59137 0.1855 0.2973 -0.18815 2020 10 16 59138 0.1843 0.2963 -0.18931 2020 10 17 59139 0.1831 0.2953 -0.19052 2020 10 18 59140 0.1819 0.2944 -0.19163 2020 10 19 59141 0.1807 0.2934 -0.19250 2020 10 20 59142 0.1794 0.2925 -0.19310 2020 10 21 59143 0.1782 0.2916 -0.19345 2020 10 22 59144 0.1769 0.2907 -0.19364 2020 10 23 59145 0.1756 0.2898 -0.19377 2020 10 24 59146 0.1743 0.2890 -0.19393 2020 10 25 59147 0.1729 0.2881 -0.19418 2020 10 26 59148 0.1716 0.2873 -0.19455 2020 10 27 59149 0.1702 0.2865 -0.19505 2020 10 28 59150 0.1688 0.2858 -0.19564 2020 10 29 59151 0.1674 0.2850 -0.19630 2020 10 30 59152 0.1660 0.2843 -0.19698 2020 10 31 59153 0.1646 0.2836 -0.19764 2020 11 1 59154 0.1631 0.2829 -0.19822 2020 11 2 59155 0.1617 0.2822 -0.19868 2020 11 3 59156 0.1602 0.2816 -0.19903 2020 11 4 59157 0.1587 0.2810 -0.19925 2020 11 5 59158 0.1572 0.2804 -0.19938 2020 11 6 59159 0.1557 0.2798 -0.19948 2020 11 7 59160 0.1542 0.2793 -0.19960 2020 11 8 59161 0.1526 0.2788 -0.19982 2020 11 9 59162 0.1511 0.2783 -0.20013 2020 11 10 59163 0.1496 0.2778 -0.20069 2020 11 11 59164 0.1480 0.2773 -0.20151 2020 11 12 59165 0.1464 0.2769 -0.20256 2020 11 13 59166 0.1448 0.2765 -0.20373 2020 11 14 59167 0.1432 0.2761 -0.20487 2020 11 15 59168 0.1416 0.2758 -0.20584 2020 11 16 59169 0.1400 0.2754 -0.20655 2020 11 17 59170 0.1384 0.2751 -0.20699 2020 11 18 59171 0.1368 0.2749 -0.20721 2020 11 19 59172 0.1352 0.2746 -0.20733 2020 11 20 59173 0.1336 0.2744 -0.20744 2020 11 21 59174 0.1319 0.2742 -0.20761 2020 11 22 59175 0.1303 0.2740 -0.20790 2020 11 23 59176 0.1286 0.2738 -0.20830 2020 11 24 59177 0.1270 0.2737 -0.20880 2020 11 25 59178 0.1253 0.2736 -0.20937 2020 11 26 59179 0.1237 0.2735 -0.20996 2020 11 27 59180 0.1220 0.2735 -0.21051 2020 11 28 59181 0.1204 0.2735 -0.21100 2020 11 29 59182 0.1187 0.2735 -0.21137 2020 11 30 59183 0.1171 0.2735 -0.21160 2020 12 1 59184 0.1154 0.2736 -0.21169 2020 12 2 59185 0.1137 0.2736 -0.21166 2020 12 3 59186 0.1121 0.2738 -0.21156 2020 12 4 59187 0.1104 0.2739 -0.21146 2020 12 5 59188 0.1088 0.2740 -0.21143 2020 12 6 59189 0.1071 0.2742 -0.21154 2020 12 7 59190 0.1055 0.2744 -0.21186 2020 12 8 59191 0.1038 0.2747 -0.21241 2020 12 9 59192 0.1022 0.2750 -0.21317 2020 12 10 59193 0.1006 0.2752 -0.21408 2020 12 11 59194 0.0989 0.2756 -0.21502 2020 12 12 59195 0.0973 0.2759 -0.21586 2020 12 13 59196 0.0957 0.2763 -0.21649 2020 12 14 59197 0.0941 0.2767 -0.21687 2020 12 15 59198 0.0925 0.2771 -0.21701 2020 12 16 59199 0.0909 0.2775 -0.21701 2020 12 17 59200 0.0893 0.2780 -0.21697 2020 12 18 59201 0.0877 0.2785 -0.21697 2020 12 19 59202 0.0861 0.2790 -0.21708 2020 12 20 59203 0.0846 0.2796 -0.21732 2020 12 21 59204 0.0830 0.2802 -0.21765 2020 12 22 59205 0.0815 0.2808 -0.21806 2020 12 23 59206 0.0799 0.2814 -0.21850 2020 12 24 59207 0.0784 0.2820 -0.21892 2020 12 25 59208 0.0769 0.2827 -0.21926 2020 12 26 59209 0.0754 0.2834 -0.21951 2020 12 27 59210 0.0739 0.2841 -0.21962 2020 12 28 59211 0.0725 0.2849 -0.21959 2020 12 29 59212 0.0710 0.2856 -0.21945 2020 12 30 59213 0.0696 0.2864 -0.21922 2020 12 31 59214 0.0681 0.2872 -0.21897 2021 1 1 59215 0.0667 0.2881 -0.21877 2021 1 2 59216 0.0653 0.2889 -0.21872 2021 1 3 59217 0.0640 0.2898 -0.21885 2021 1 4 59218 0.0626 0.2907 -0.21921 2021 1 5 59219 0.0613 0.2917 -0.21977 2021 1 6 59220 0.0599 0.2926 -0.22048 2021 1 7 59221 0.0586 0.2936 -0.22124 2021 1 8 59222 0.0573 0.2946 -0.22193 2021 1 9 59223 0.0561 0.2956 -0.22246 2021 1 10 59224 0.0548 0.2966 -0.22277 2021 1 11 59225 0.0536 0.2977 -0.22286 2021 1 12 59226 0.0524 0.2988 -0.22279 2021 1 13 59227 0.0512 0.2999 -0.22265 2021 1 14 59228 0.0500 0.3010 -0.22255 2021 1 15 59229 0.0488 0.3021 -0.22256 2021 1 16 59230 0.0477 0.3033 -0.22270 2021 1 17 59231 0.0466 0.3044 -0.22297 2021 1 18 59232 0.0455 0.3056 -0.22334 2021 1 19 59233 0.0444 0.3068 -0.22375 2021 1 20 59234 0.0434 0.3081 -0.22417 2021 1 21 59235 0.0424 0.3093 -0.22453 2021 1 22 59236 0.0414 0.3106 -0.22479 2021 1 23 59237 0.0404 0.3119 -0.22494 2021 1 24 59238 0.0395 0.3132 -0.22497 2021 1 25 59239 0.0385 0.3145 -0.22488 2021 1 26 59240 0.0377 0.3158 -0.22471 2021 1 27 59241 0.0368 0.3171 -0.22453 2021 1 28 59242 0.0359 0.3185 -0.22441 2021 1 29 59243 0.0351 0.3199 -0.22444 2021 1 30 59244 0.0343 0.3213 -0.22468 2021 1 31 59245 0.0335 0.3227 -0.22519 2021 2 1 59246 0.0328 0.3241 -0.22594 2021 2 2 59247 0.0321 0.3255 -0.22686 2021 2 3 59248 0.0314 0.3269 -0.22785 2021 2 4 59249 0.0307 0.3284 -0.22879 2021 2 5 59250 0.0301 0.3299 -0.22959 2021 2 6 59251 0.0295 0.3313 -0.23020 2021 2 7 59252 0.0289 0.3328 -0.23063 2021 2 8 59253 0.0284 0.3343 -0.23093 2021 2 9 59254 0.0278 0.3358 -0.23120 2021 2 10 59255 0.0274 0.3373 -0.23152 2021 2 11 59256 0.0269 0.3389 -0.23198 2021 2 12 59257 0.0265 0.3404 -0.23260 2021 2 13 59258 0.0260 0.3419 -0.23335 2021 2 14 59259 0.0257 0.3435 -0.23420 2021 2 15 59260 0.0253 0.3450 -0.23507 2021 2 16 59261 0.0250 0.3466 -0.23589 2021 2 17 59262 0.0247 0.3482 -0.23660 2021 2 18 59263 0.0245 0.3498 -0.23714 2021 2 19 59264 0.0242 0.3513 -0.23749 2021 2 20 59265 0.0240 0.3529 -0.23768 2021 2 21 59266 0.0239 0.3545 -0.23773 2021 2 22 59267 0.0237 0.3561 -0.23769 2021 2 23 59268 0.0236 0.3577 -0.23765 2021 2 24 59269 0.0235 0.3593 -0.23769 2021 2 25 59270 0.0235 0.3609 -0.23792 2021 2 26 59271 0.0235 0.3625 -0.23839 2021 2 27 59272 0.0235 0.3641 -0.23915 2021 2 28 59273 0.0235 0.3658 -0.24021 2021 3 1 59274 0.0236 0.3674 -0.24150 2021 3 2 59275 0.0237 0.3690 -0.24290 2021 3 3 59276 0.0238 0.3706 -0.24427 2021 3 4 59277 0.0240 0.3722 -0.24546 2021 3 5 59278 0.0242 0.3738 -0.24643 2021 3 6 59279 0.0244 0.3754 -0.24714 2021 3 7 59280 0.0247 0.3770 -0.24763 2021 3 8 59281 0.0250 0.3786 -0.24798 2021 3 9 59282 0.0253 0.3802 -0.24830 2021 3 10 59283 0.0256 0.3818 -0.24864 2021 3 11 59284 0.0260 0.3834 -0.24904 2021 3 12 59285 0.0264 0.3850 -0.24954 2021 3 13 59286 0.0269 0.3866 -0.25015 2021 3 14 59287 0.0273 0.3882 -0.25081 2021 3 15 59288 0.0278 0.3898 -0.25144 2021 3 16 59289 0.0284 0.3913 -0.25206 2021 3 17 59290 0.0289 0.3929 -0.25264 2021 3 18 59291 0.0295 0.3944 -0.25313 2021 3 19 59292 0.0301 0.3960 -0.25349 2021 3 20 59293 0.0308 0.3975 -0.25369 2021 3 21 59294 0.0314 0.3990 -0.25378 2021 3 22 59295 0.0321 0.4006 -0.25378 2021 3 23 59296 0.0329 0.4021 -0.25384 2021 3 24 59297 0.0336 0.4036 -0.25402 2021 3 25 59298 0.0344 0.4051 -0.25436 2021 3 26 59299 0.0353 0.4065 -0.25491 2021 3 27 59300 0.0361 0.4080 -0.25573 2021 3 28 59301 0.0370 0.4095 -0.25683 2021 3 29 59302 0.0379 0.4109 -0.25816 2021 3 30 59303 0.0388 0.4123 -0.25953 2021 3 31 59304 0.0398 0.4138 -0.26078 2021 4 1 59305 0.0408 0.4152 -0.26177 2021 4 2 59306 0.0418 0.4166 -0.26249 2021 4 3 59307 0.0428 0.4179 -0.26295 2021 4 4 59308 0.0439 0.4193 -0.26318 2021 4 5 59309 0.0450 0.4206 -0.26328 2021 4 6 59310 0.0461 0.4220 -0.26346 2021 4 7 59311 0.0472 0.4233 -0.26379 2021 4 8 59312 0.0484 0.4246 -0.26422 2021 4 9 59313 0.0496 0.4259 -0.26479 2021 4 10 59314 0.0508 0.4271 -0.26550 2021 4 11 59315 0.0520 0.4284 -0.26624 2021 4 12 59316 0.0533 0.4296 -0.26690 2021 4 13 59317 0.0546 0.4308 -0.26751 2021 4 14 59318 0.0559 0.4320 -0.26803 2021 4 15 59319 0.0572 0.4332 -0.26848 2021 4 16 59320 0.0586 0.4343 -0.26887 2021 4 17 59321 0.0599 0.4354 -0.26911 2021 4 18 59322 0.0613 0.4366 -0.26924 2021 4 19 59323 0.0627 0.4376 -0.26931 2021 4 20 59324 0.0642 0.4387 -0.26940 2021 4 21 59325 0.0656 0.4398 -0.26962 2021 4 22 59326 0.0671 0.4408 -0.27001 2021 4 23 59327 0.0686 0.4418 -0.27061 2021 4 24 59328 0.0701 0.4428 -0.27143 2021 4 25 59329 0.0717 0.4437 -0.27242 2021 4 26 59330 0.0732 0.4447 -0.27347 2021 4 27 59331 0.0748 0.4456 -0.27448 2021 4 28 59332 0.0764 0.4465 -0.27533 2021 4 29 59333 0.0780 0.4473 -0.27584 2021 4 30 59334 0.0796 0.4482 -0.27602 2021 5 1 59335 0.0812 0.4490 -0.27594 2021 5 2 59336 0.0829 0.4498 -0.27572 2021 5 3 59337 0.0846 0.4506 -0.27549 2021 5 4 59338 0.0863 0.4513 -0.27536 2021 5 5 59339 0.0879 0.4520 -0.27541 2021 5 6 59340 0.0897 0.4527 -0.27561 2021 5 7 59341 0.0914 0.4534 -0.27589 2021 5 8 59342 0.0931 0.4540 -0.27618 2021 5 9 59343 0.0949 0.4546 -0.27646 2021 5 10 59344 0.0966 0.4552 -0.27670 2021 5 11 59345 0.0984 0.4558 -0.27688 2021 5 12 59346 0.1002 0.4563 -0.27695 2021 5 13 59347 0.1020 0.4568 -0.27687 2021 5 14 59348 0.1038 0.4573 -0.27666 2021 5 15 59349 0.1056 0.4578 -0.27629 2021 5 16 59350 0.1074 0.4582 -0.27579 2021 5 17 59351 0.1092 0.4586 -0.27521 2021 5 18 59352 0.1111 0.4589 -0.27461 2021 5 19 59353 0.1129 0.4593 -0.27409 2021 5 20 59354 0.1148 0.4596 -0.27375 2021 5 21 59355 0.1166 0.4599 -0.27364 2021 5 22 59356 0.1185 0.4601 -0.27371 2021 5 23 59357 0.1204 0.4604 -0.27390 2021 5 24 59358 0.1222 0.4606 -0.27413 2021 5 25 59359 0.1241 0.4607 -0.27425 2021 5 26 59360 0.1260 0.4609 -0.27413 2021 5 27 59361 0.1279 0.4610 -0.27370 2021 5 28 59362 0.1297 0.4611 -0.27301 2021 5 29 59363 0.1316 0.4611 -0.27215 2021 5 30 59364 0.1335 0.4611 -0.27123 2021 5 31 59365 0.1354 0.4611 -0.27043 2021 6 1 59366 0.1373 0.4611 -0.26985 2021 6 2 59367 0.1392 0.4610 -0.26943 2021 6 3 59368 0.1411 0.4610 -0.26914 2021 6 4 59369 0.1429 0.4608 -0.26893 2021 6 5 59370 0.1448 0.4607 -0.26869 2021 6 6 59371 0.1467 0.4605 -0.26833 2021 6 7 59372 0.1486 0.4603 -0.26779 2021 6 8 59373 0.1504 0.4601 -0.26710 2021 6 9 59374 0.1523 0.4598 -0.26625 2021 6 10 59375 0.1542 0.4595 -0.26523 2021 6 11 59376 0.1560 0.4592 -0.26408 2021 6 12 59377 0.1579 0.4588 -0.26287 2021 6 13 59378 0.1597 0.4584 -0.26166 2021 6 14 59379 0.1616 0.4580 -0.26053 2021 6 15 59380 0.1634 0.4576 -0.25955 2021 6 16 59381 0.1652 0.4571 -0.25880 2021 6 17 59382 0.1670 0.4566 -0.25836 2021 6 18 59383 0.1688 0.4561 -0.25814 2021 6 19 59384 0.1706 0.4555 -0.25807 2021 6 20 59385 0.1724 0.4550 -0.25807 2021 6 21 59386 0.1742 0.4544 -0.25812 2021 6 22 59387 0.1759 0.4537 -0.25802 2021 6 23 59388 0.1777 0.4531 -0.25771 2021 6 24 59389 0.1794 0.4524 -0.25723 2021 6 25 59390 0.1812 0.4516 -0.25654 2021 6 26 59391 0.1829 0.4509 -0.25581 2021 6 27 59392 0.1846 0.4501 -0.25515 2021 6 28 59393 0.1862 0.4493 -0.25459 2021 6 29 59394 0.1879 0.4485 -0.25412 2021 6 30 59395 0.1896 0.4477 -0.25380 2021 7 1 59396 0.1912 0.4468 -0.25351 2021 7 2 59397 0.1928 0.4459 -0.25318 2021 7 3 59398 0.1944 0.4449 -0.25284 2021 7 4 59399 0.1960 0.4440 -0.25242 2021 7 5 59400 0.1976 0.4430 -0.25190 2021 7 6 59401 0.1991 0.4420 -0.25122 2021 7 7 59402 0.2007 0.4410 -0.25039 2021 7 8 59403 0.2022 0.4399 -0.24947 2021 7 9 59404 0.2037 0.4388 -0.24848 2021 7 10 59405 0.2051 0.4377 -0.24739 2021 7 11 59406 0.2066 0.4366 -0.24631 2021 7 12 59407 0.2080 0.4354 -0.24532 2021 7 13 59408 0.2094 0.4343 -0.24447 2021 7 14 59409 0.2108 0.4331 -0.24384 2021 7 15 59410 0.2122 0.4319 -0.24348 2021 7 16 59411 0.2135 0.4306 -0.24331 2021 7 17 59412 0.2149 0.4294 -0.24333 2021 7 18 59413 0.2162 0.4281 -0.24332 2021 7 19 59414 0.2174 0.4268 -0.24314 2021 7 20 59415 0.2187 0.4255 -0.24272 2021 7 21 59416 0.2199 0.4241 -0.24215 2021 7 22 59417 0.2211 0.4227 -0.24139 2021 7 23 59418 0.2223 0.4214 -0.24056 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) 59031 -111.39 0.34 -9.86 0.14 59032 -111.95 0.34 -9.96 0.14 59033 -112.13 0.34 -10.06 0.14 59034 -111.96 0.38 -10.11 0.19 59035 -111.65 0.59 -10.15 0.21 59036 -111.40 0.61 -10.25 0.21 59037 -111.30 0.61 -10.41 0.21 59038 -111.41 0.61 -10.54 0.21 59039 -111.70 0.61 -10.57 0.21 59040 -112.09 0.61 -10.52 0.21 59041 -112.45 0.32 -10.47 0.16 59042 -112.71 0.39 -10.43 0.19 59043 -112.91 0.39 -10.33 0.19 59044 -113.21 0.39 -10.11 0.19 IAU2000A Celestial Pole Offset Series MJD dX error dY error (msec. of arc) 59031 0.148 0.135 -0.163 0.142 59032 0.155 0.135 -0.178 0.142 59033 0.168 0.135 -0.193 0.142 59034 0.183 0.153 -0.208 0.190 59035 0.200 0.236 -0.222 0.210 59036 0.214 0.242 -0.233 0.214 59037 0.225 0.242 -0.242 0.214 59038 0.230 0.242 -0.246 0.214 59039 0.229 0.242 -0.245 0.214 59040 0.223 0.242 -0.241 0.214 59041 0.214 0.128 -0.235 0.160 59042 0.201 0.154 -0.226 0.189 59043 0.186 0.154 -0.216 0.189 59044 0.170 0.154 -0.204 0.189 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).