********************************************************************** * * * I E R S B U L L E T I N - A * * * * Rapid Service/Prediction of Earth Orientation * ********************************************************************** 27 August 2020 Vol. XXXIII No. 035 ______________________________________________________________________ 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 8 21 59082 0.21676 .00009 0.37351 .00009 -0.193347 0.000025 20 8 22 59083 0.21701 .00009 0.37184 .00009 -0.193241 0.000024 20 8 23 59084 0.21759 .00009 0.37015 .00009 -0.193185 0.000025 20 8 24 59085 0.21828 .00009 0.36869 .00009 -0.193043 0.000032 20 8 25 59086 0.21870 .00009 0.36733 .00009 -0.192708 0.000037 20 8 26 59087 0.21873 .00009 0.36608 .00009 -0.192119 0.000033 20 8 27 59088 0.21849 .00009 0.36497 .00009 -0.191265 0.000031 _______________________________________________________________________ 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 + 0.0854 cos A + 0.0077 sin A + 0.0058 cos C + 0.0016 sin C y = 0.3590 + 0.0058 cos A - 0.0810 sin A + 0.0016 cos C - 0.0058 sin C UT1-UTC = -0.2013 - 0.00008 (MJD - 59096) - (UT2-UT1) where A = 2*pi*(MJD-59088)/365.25 and C = 2*pi*(MJD-59088)/435. TAI-UTC(MJD 59089) = 37.0 The accuracy may be estimated from the expressions: S x,y = 0.00068 (MJD-59088)**0.80 S t = 0.00025 (MJD-59088)**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 8 28 59089 0.2182 0.3637 -0.19017 2020 8 29 59090 0.2179 0.3624 -0.18893 2020 8 30 59091 0.2178 0.3609 -0.18767 2020 8 31 59092 0.2178 0.3594 -0.18646 2020 9 1 59093 0.2178 0.3579 -0.18538 2020 9 2 59094 0.2178 0.3565 -0.18445 2020 9 3 59095 0.2178 0.3551 -0.18366 2020 9 4 59096 0.2176 0.3537 -0.18296 2020 9 5 59097 0.2175 0.3523 -0.18233 2020 9 6 59098 0.2173 0.3509 -0.18169 2020 9 7 59099 0.2172 0.3495 -0.18101 2020 9 8 59100 0.2170 0.3480 -0.18029 2020 9 9 59101 0.2168 0.3466 -0.17954 2020 9 10 59102 0.2166 0.3452 -0.17875 2020 9 11 59103 0.2164 0.3437 -0.17792 2020 9 12 59104 0.2161 0.3423 -0.17707 2020 9 13 59105 0.2158 0.3409 -0.17625 2020 9 14 59106 0.2155 0.3395 -0.17555 2020 9 15 59107 0.2151 0.3381 -0.17510 2020 9 16 59108 0.2147 0.3367 -0.17496 2020 9 17 59109 0.2143 0.3352 -0.17517 2020 9 18 59110 0.2139 0.3339 -0.17566 2020 9 19 59111 0.2134 0.3325 -0.17630 2020 9 20 59112 0.2129 0.3311 -0.17693 2020 9 21 59113 0.2124 0.3297 -0.17741 2020 9 22 59114 0.2119 0.3284 -0.17765 2020 9 23 59115 0.2113 0.3270 -0.17763 2020 9 24 59116 0.2107 0.3256 -0.17740 2020 9 25 59117 0.2101 0.3243 -0.17706 2020 9 26 59118 0.2095 0.3230 -0.17669 2020 9 27 59119 0.2088 0.3217 -0.17639 2020 9 28 59120 0.2081 0.3204 -0.17618 2020 9 29 59121 0.2073 0.3191 -0.17611 2020 9 30 59122 0.2066 0.3178 -0.17615 2020 10 1 59123 0.2058 0.3165 -0.17627 2020 10 2 59124 0.2050 0.3152 -0.17645 2020 10 3 59125 0.2042 0.3140 -0.17664 2020 10 4 59126 0.2033 0.3127 -0.17679 2020 10 5 59127 0.2024 0.3115 -0.17685 2020 10 6 59128 0.2015 0.3103 -0.17681 2020 10 7 59129 0.2006 0.3091 -0.17665 2020 10 8 59130 0.1996 0.3079 -0.17639 2020 10 9 59131 0.1986 0.3068 -0.17607 2020 10 10 59132 0.1976 0.3056 -0.17573 2020 10 11 59133 0.1966 0.3045 -0.17546 2020 10 12 59134 0.1955 0.3033 -0.17534 2020 10 13 59135 0.1945 0.3022 -0.17547 2020 10 14 59136 0.1934 0.3011 -0.17588 2020 10 15 59137 0.1922 0.3001 -0.17658 2020 10 16 59138 0.1911 0.2990 -0.17748 2020 10 17 59139 0.1899 0.2980 -0.17842 2020 10 18 59140 0.1887 0.2969 -0.17925 2020 10 19 59141 0.1875 0.2959 -0.17987 2020 10 20 59142 0.1863 0.2949 -0.18023 2020 10 21 59143 0.1850 0.2940 -0.18035 2020 10 22 59144 0.1838 0.2930 -0.18033 2020 10 23 59145 0.1825 0.2921 -0.18026 2020 10 24 59146 0.1812 0.2912 -0.18024 2020 10 25 59147 0.1799 0.2903 -0.18033 2020 10 26 59148 0.1785 0.2894 -0.18055 2020 10 27 59149 0.1772 0.2886 -0.18091 2020 10 28 59150 0.1758 0.2877 -0.18138 2020 10 29 59151 0.1744 0.2869 -0.18193 2020 10 30 59152 0.1730 0.2861 -0.18250 2020 10 31 59153 0.1715 0.2854 -0.18306 2020 11 1 59154 0.1701 0.2846 -0.18354 2020 11 2 59155 0.1686 0.2839 -0.18391 2020 11 3 59156 0.1671 0.2832 -0.18415 2020 11 4 59157 0.1657 0.2825 -0.18427 2020 11 5 59158 0.1642 0.2819 -0.18429 2020 11 6 59159 0.1626 0.2812 -0.18426 2020 11 7 59160 0.1611 0.2806 -0.18426 2020 11 8 59161 0.1596 0.2801 -0.18437 2020 11 9 59162 0.1580 0.2795 -0.18465 2020 11 10 59163 0.1564 0.2790 -0.18517 2020 11 11 59164 0.1549 0.2785 -0.18595 2020 11 12 59165 0.1533 0.2780 -0.18695 2020 11 13 59166 0.1517 0.2775 -0.18807 2020 11 14 59167 0.1501 0.2771 -0.18915 2020 11 15 59168 0.1484 0.2767 -0.19006 2020 11 16 59169 0.1468 0.2763 -0.19072 2020 11 17 59170 0.1452 0.2759 -0.19111 2020 11 18 59171 0.1435 0.2756 -0.19129 2020 11 19 59172 0.1419 0.2753 -0.19136 2020 11 20 59173 0.1402 0.2750 -0.19142 2020 11 21 59174 0.1386 0.2747 -0.19156 2020 11 22 59175 0.1369 0.2745 -0.19179 2020 11 23 59176 0.1352 0.2743 -0.19213 2020 11 24 59177 0.1336 0.2741 -0.19257 2020 11 25 59178 0.1319 0.2739 -0.19306 2020 11 26 59179 0.1302 0.2738 -0.19356 2020 11 27 59180 0.1285 0.2737 -0.19402 2020 11 28 59181 0.1268 0.2736 -0.19441 2020 11 29 59182 0.1251 0.2736 -0.19469 2020 11 30 59183 0.1234 0.2735 -0.19483 2020 12 1 59184 0.1217 0.2735 -0.19483 2020 12 2 59185 0.1200 0.2736 -0.19471 2020 12 3 59186 0.1183 0.2736 -0.19453 2020 12 4 59187 0.1166 0.2737 -0.19435 2020 12 5 59188 0.1149 0.2738 -0.19424 2020 12 6 59189 0.1132 0.2740 -0.19428 2020 12 7 59190 0.1115 0.2741 -0.19454 2020 12 8 59191 0.1098 0.2743 -0.19502 2020 12 9 59192 0.1082 0.2745 -0.19573 2020 12 10 59193 0.1065 0.2748 -0.19658 2020 12 11 59194 0.1048 0.2750 -0.19747 2020 12 12 59195 0.1031 0.2753 -0.19825 2020 12 13 59196 0.1015 0.2756 -0.19883 2020 12 14 59197 0.0998 0.2760 -0.19907 2020 12 15 59198 0.0981 0.2764 -0.19907 2020 12 16 59199 0.0965 0.2768 -0.19894 2020 12 17 59200 0.0948 0.2772 -0.19876 2020 12 18 59201 0.0932 0.2776 -0.19863 2020 12 19 59202 0.0916 0.2781 -0.19862 2020 12 20 59203 0.0900 0.2786 -0.19872 2020 12 21 59204 0.0883 0.2791 -0.19893 2020 12 22 59205 0.0867 0.2797 -0.19922 2020 12 23 59206 0.0852 0.2803 -0.19953 2020 12 24 59207 0.0836 0.2809 -0.19983 2020 12 25 59208 0.0820 0.2815 -0.20006 2020 12 26 59209 0.0805 0.2821 -0.20019 2020 12 27 59210 0.0789 0.2828 -0.20018 2020 12 28 59211 0.0774 0.2835 -0.20004 2020 12 29 59212 0.0759 0.2843 -0.19979 2020 12 30 59213 0.0744 0.2850 -0.19945 2020 12 31 59214 0.0729 0.2858 -0.19910 2021 1 1 59215 0.0714 0.2866 -0.19880 2021 1 2 59216 0.0699 0.2874 -0.19865 2021 1 3 59217 0.0685 0.2882 -0.19870 2021 1 4 59218 0.0671 0.2891 -0.19897 2021 1 5 59219 0.0657 0.2900 -0.19945 2021 1 6 59220 0.0643 0.2909 -0.20008 2021 1 7 59221 0.0629 0.2919 -0.20076 2021 1 8 59222 0.0615 0.2928 -0.20138 2021 1 9 59223 0.0602 0.2938 -0.20184 2021 1 10 59224 0.0589 0.2948 -0.20209 2021 1 11 59225 0.0576 0.2958 -0.20212 2021 1 12 59226 0.0563 0.2969 -0.20199 2021 1 13 59227 0.0550 0.2979 -0.20180 2021 1 14 59228 0.0538 0.2990 -0.20164 2021 1 15 59229 0.0525 0.3001 -0.20159 2021 1 16 59230 0.0513 0.3012 -0.20169 2021 1 17 59231 0.0502 0.3024 -0.20191 2021 1 18 59232 0.0490 0.3035 -0.20223 2021 1 19 59233 0.0479 0.3047 -0.20260 2021 1 20 59234 0.0468 0.3059 -0.20297 2021 1 21 59235 0.0457 0.3072 -0.20329 2021 1 22 59236 0.0446 0.3084 -0.20352 2021 1 23 59237 0.0436 0.3096 -0.20363 2021 1 24 59238 0.0425 0.3109 -0.20361 2021 1 25 59239 0.0415 0.3122 -0.20347 2021 1 26 59240 0.0406 0.3135 -0.20325 2021 1 27 59241 0.0396 0.3148 -0.20300 2021 1 28 59242 0.0387 0.3162 -0.20280 2021 1 29 59243 0.0378 0.3175 -0.20274 2021 1 30 59244 0.0370 0.3189 -0.20289 2021 1 31 59245 0.0361 0.3203 -0.20328 2021 2 1 59246 0.0353 0.3217 -0.20391 2021 2 2 59247 0.0345 0.3231 -0.20470 2021 2 3 59248 0.0337 0.3245 -0.20556 2021 2 4 59249 0.0330 0.3259 -0.20636 2021 2 5 59250 0.0323 0.3274 -0.20702 2021 2 6 59251 0.0316 0.3288 -0.20747 2021 2 7 59252 0.0310 0.3303 -0.20771 2021 2 8 59253 0.0304 0.3318 -0.20779 2021 2 9 59254 0.0298 0.3333 -0.20780 2021 2 10 59255 0.0292 0.3348 -0.20782 2021 2 11 59256 0.0287 0.3363 -0.20794 2021 2 12 59257 0.0282 0.3378 -0.20821 2021 2 13 59258 0.0277 0.3393 -0.20864 2021 2 14 59259 0.0272 0.3409 -0.20919 2021 2 15 59260 0.0268 0.3424 -0.20982 2021 2 16 59261 0.0264 0.3440 -0.21048 2021 2 17 59262 0.0261 0.3455 -0.21110 2021 2 18 59263 0.0257 0.3471 -0.21163 2021 2 19 59264 0.0254 0.3487 -0.21205 2021 2 20 59265 0.0252 0.3503 -0.21234 2021 2 21 59266 0.0249 0.3518 -0.21250 2021 2 22 59267 0.0247 0.3534 -0.21256 2021 2 23 59268 0.0246 0.3550 -0.21257 2021 2 24 59269 0.0244 0.3566 -0.21261 2021 2 25 59270 0.0243 0.3582 -0.21275 2021 2 26 59271 0.0242 0.3598 -0.21308 2021 2 27 59272 0.0242 0.3614 -0.21366 2021 2 28 59273 0.0241 0.3631 -0.21449 2021 3 1 59274 0.0241 0.3647 -0.21553 2021 3 2 59275 0.0242 0.3663 -0.21665 2021 3 3 59276 0.0243 0.3679 -0.21772 2021 3 4 59277 0.0244 0.3695 -0.21861 2021 3 5 59278 0.0245 0.3711 -0.21925 2021 3 6 59279 0.0247 0.3727 -0.21963 2021 3 7 59280 0.0249 0.3743 -0.21981 2021 3 8 59281 0.0251 0.3760 -0.21988 2021 3 9 59282 0.0253 0.3776 -0.21995 2021 3 10 59283 0.0256 0.3792 -0.22013 2021 3 11 59284 0.0259 0.3808 -0.22048 2021 3 12 59285 0.0263 0.3824 -0.22103 2021 3 13 59286 0.0267 0.3840 -0.22177 2021 3 14 59287 0.0271 0.3855 -0.22265 2021 3 15 59288 0.0275 0.3871 -0.22363 2021 3 16 59289 0.0280 0.3887 -0.22461 2021 3 17 59290 0.0285 0.3903 -0.22553 2021 3 18 59291 0.0290 0.3918 -0.22634 2021 3 19 59292 0.0296 0.3934 -0.22699 2021 3 20 59293 0.0302 0.3949 -0.22748 2021 3 21 59294 0.0308 0.3965 -0.22783 2021 3 22 59295 0.0315 0.3980 -0.22807 2021 3 23 59296 0.0322 0.3995 -0.22827 2021 3 24 59297 0.0329 0.4011 -0.22849 2021 3 25 59298 0.0336 0.4026 -0.22884 2021 3 26 59299 0.0344 0.4041 -0.22941 2021 3 27 59300 0.0352 0.4055 -0.23025 2021 3 28 59301 0.0360 0.4070 -0.23137 2021 3 29 59302 0.0369 0.4085 -0.23269 2021 3 30 59303 0.0378 0.4099 -0.23407 2021 3 31 59304 0.0387 0.4114 -0.23535 2021 4 1 59305 0.0396 0.4128 -0.23638 2021 4 2 59306 0.0406 0.4142 -0.23715 2021 4 3 59307 0.0416 0.4156 -0.23770 2021 4 4 59308 0.0426 0.4170 -0.23813 2021 4 5 59309 0.0437 0.4183 -0.23852 2021 4 6 59310 0.0447 0.4197 -0.23898 2021 4 7 59311 0.0458 0.4210 -0.23958 2021 4 8 59312 0.0470 0.4223 -0.24035 2021 4 9 59313 0.0481 0.4237 -0.24130 2021 4 10 59314 0.0493 0.4249 -0.24242 2021 4 11 59315 0.0505 0.4262 -0.24368 2021 4 12 59316 0.0517 0.4275 -0.24498 2021 4 13 59317 0.0530 0.4287 -0.24621 2021 4 14 59318 0.0543 0.4299 -0.24734 2021 4 15 59319 0.0556 0.4311 -0.24832 2021 4 16 59320 0.0569 0.4323 -0.24912 2021 4 17 59321 0.0582 0.4334 -0.24980 2021 4 18 59322 0.0596 0.4346 -0.25040 2021 4 19 59323 0.0610 0.4357 -0.25100 2021 4 20 59324 0.0624 0.4368 -0.25162 2021 4 21 59325 0.0638 0.4379 -0.25231 2021 4 22 59326 0.0653 0.4389 -0.25313 2021 4 23 59327 0.0668 0.4400 -0.25411 2021 4 24 59328 0.0682 0.4410 -0.25520 2021 4 25 59329 0.0698 0.4420 -0.25643 2021 4 26 59330 0.0713 0.4429 -0.25772 2021 4 27 59331 0.0728 0.4439 -0.25891 2021 4 28 59332 0.0744 0.4448 -0.25987 2021 4 29 59333 0.0760 0.4457 -0.26049 2021 4 30 59334 0.0776 0.4466 -0.26076 2021 5 1 59335 0.0792 0.4474 -0.26079 2021 5 2 59336 0.0809 0.4483 -0.26075 2021 5 3 59337 0.0825 0.4491 -0.26073 2021 5 4 59338 0.0842 0.4499 -0.26083 2021 5 5 59339 0.0859 0.4506 -0.26117 2021 5 6 59340 0.0876 0.4513 -0.26173 2021 5 7 59341 0.0893 0.4520 -0.26235 2021 5 8 59342 0.0910 0.4527 -0.26306 2021 5 9 59343 0.0928 0.4534 -0.26381 2021 5 10 59344 0.0945 0.4540 -0.26449 2021 5 11 59345 0.0963 0.4546 -0.26506 2021 5 12 59346 0.0981 0.4552 -0.26547 2021 5 13 59347 0.0999 0.4557 -0.26569 2021 5 14 59348 0.1016 0.4562 -0.26575 2021 5 15 59349 0.1035 0.4567 -0.26567 2021 5 16 59350 0.1053 0.4572 -0.26547 2021 5 17 59351 0.1071 0.4576 -0.26524 2021 5 18 59352 0.1089 0.4580 -0.26504 2021 5 19 59353 0.1108 0.4584 -0.26492 2021 5 20 59354 0.1126 0.4588 -0.26493 2021 5 21 59355 0.1145 0.4591 -0.26512 2021 5 22 59356 0.1164 0.4594 -0.26551 2021 5 23 59357 0.1182 0.4597 -0.26601 2021 5 24 59358 0.1201 0.4599 -0.26646 2021 5 25 59359 0.1220 0.4601 -0.26681 2021 5 26 59360 0.1239 0.4603 -0.26695 2021 5 27 59361 0.1258 0.4604 -0.26682 2021 5 28 59362 0.1277 0.4606 -0.26644 2021 5 29 59363 0.1296 0.4607 -0.26589 2021 5 30 59364 0.1315 0.4607 -0.26529 2021 5 31 59365 0.1334 0.4608 -0.26474 2021 6 1 59366 0.1353 0.4608 -0.26436 2021 6 2 59367 0.1372 0.4608 -0.26417 2021 6 3 59368 0.1391 0.4607 -0.26408 2021 6 4 59369 0.1409 0.4606 -0.26400 2021 6 5 59370 0.1428 0.4605 -0.26390 2021 6 6 59371 0.1447 0.4604 -0.26377 2021 6 7 59372 0.1466 0.4602 -0.26357 2021 6 8 59373 0.1485 0.4600 -0.26324 2021 6 9 59374 0.1504 0.4598 -0.26275 2021 6 10 59375 0.1523 0.4596 -0.26206 2021 6 11 59376 0.1542 0.4593 -0.26124 2021 6 12 59377 0.1560 0.4590 -0.26030 2021 6 13 59378 0.1579 0.4587 -0.25927 2021 6 14 59379 0.1598 0.4583 -0.25821 2021 6 15 59380 0.1616 0.4579 -0.25730 2021 6 16 59381 0.1635 0.4575 -0.25661 2021 6 17 59382 0.1653 0.4570 -0.25610 2021 6 18 59383 0.1671 0.4565 -0.25580 2021 6 19 59384 0.1690 0.4560 -0.25571 2021 6 20 59385 0.1708 0.4555 -0.25568 2021 6 21 59386 0.1726 0.4549 -0.25553 2021 6 22 59387 0.1744 0.4543 -0.25523 2021 6 23 59388 0.1762 0.4537 -0.25471 2021 6 24 59389 0.1779 0.4531 -0.25400 2021 6 25 59390 0.1797 0.4524 -0.25320 2021 6 26 59391 0.1814 0.4517 -0.25233 2021 6 27 59392 0.1832 0.4510 -0.25149 2021 6 28 59393 0.1849 0.4502 -0.25075 2021 6 29 59394 0.1866 0.4494 -0.25016 2021 6 30 59395 0.1883 0.4486 -0.24972 2021 7 1 59396 0.1899 0.4478 -0.24934 2021 7 2 59397 0.1916 0.4469 -0.24894 2021 7 3 59398 0.1932 0.4461 -0.24843 2021 7 4 59399 0.1949 0.4452 -0.24778 2021 7 5 59400 0.1965 0.4442 -0.24695 2021 7 6 59401 0.1981 0.4433 -0.24595 2021 7 7 59402 0.1996 0.4423 -0.24484 2021 7 8 59403 0.2012 0.4413 -0.24354 2021 7 9 59404 0.2027 0.4402 -0.24210 2021 7 10 59405 0.2042 0.4392 -0.24059 2021 7 11 59406 0.2057 0.4381 -0.23908 2021 7 12 59407 0.2072 0.4370 -0.23769 2021 7 13 59408 0.2086 0.4359 -0.23649 2021 7 14 59409 0.2101 0.4347 -0.23557 2021 7 15 59410 0.2115 0.4335 -0.23488 2021 7 16 59411 0.2129 0.4323 -0.23436 2021 7 17 59412 0.2142 0.4311 -0.23391 2021 7 18 59413 0.2156 0.4299 -0.23344 2021 7 19 59414 0.2169 0.4286 -0.23287 2021 7 20 59415 0.2182 0.4273 -0.23215 2021 7 21 59416 0.2195 0.4260 -0.23125 2021 7 22 59417 0.2207 0.4247 -0.23019 2021 7 23 59418 0.2219 0.4234 -0.22906 2021 7 24 59419 0.2231 0.4220 -0.22792 2021 7 25 59420 0.2243 0.4206 -0.22685 2021 7 26 59421 0.2254 0.4192 -0.22588 2021 7 27 59422 0.2265 0.4178 -0.22500 2021 7 28 59423 0.2276 0.4164 -0.22418 2021 7 29 59424 0.2287 0.4149 -0.22340 2021 7 30 59425 0.2297 0.4135 -0.22259 2021 7 31 59426 0.2307 0.4120 -0.22165 2021 8 1 59427 0.2317 0.4105 -0.22055 2021 8 2 59428 0.2327 0.4090 -0.21932 2021 8 3 59429 0.2336 0.4075 -0.21795 2021 8 4 59430 0.2345 0.4059 -0.21644 2021 8 5 59431 0.2353 0.4043 -0.21483 2021 8 6 59432 0.2362 0.4028 -0.21318 2021 8 7 59433 0.2370 0.4012 -0.21156 2021 8 8 59434 0.2378 0.3996 -0.21004 2021 8 9 59435 0.2385 0.3980 -0.20876 2021 8 10 59436 0.2392 0.3963 -0.20783 2021 8 11 59437 0.2399 0.3947 -0.20716 2021 8 12 59438 0.2405 0.3931 -0.20674 2021 8 13 59439 0.2412 0.3914 -0.20647 2021 8 14 59440 0.2418 0.3897 -0.20618 2021 8 15 59441 0.2423 0.3881 -0.20572 2021 8 16 59442 0.2428 0.3864 -0.20501 2021 8 17 59443 0.2433 0.3847 -0.20409 2021 8 18 59444 0.2438 0.3830 -0.20299 2021 8 19 59445 0.2442 0.3813 -0.20178 2021 8 20 59446 0.2446 0.3795 -0.20059 2021 8 21 59447 0.2450 0.3778 -0.19954 2021 8 22 59448 0.2453 0.3761 -0.19870 2021 8 23 59449 0.2456 0.3743 -0.19810 2021 8 24 59450 0.2459 0.3726 -0.19769 2021 8 25 59451 0.2461 0.3708 -0.19744 2021 8 26 59452 0.2463 0.3691 -0.19730 2021 8 27 59453 0.2465 0.3673 -0.19714 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) 59062 -116.17 0.35 -10.11 0.08 59063 -115.95 0.28 -10.21 0.06 59064 -115.73 0.28 -10.33 0.06 59065 -115.64 0.22 -10.41 0.04 59066 -115.69 0.30 -10.38 0.04 59067 -115.84 0.30 -10.25 0.04 59068 -116.07 0.30 -10.13 0.04 59069 -116.27 0.40 -10.08 0.03 59070 -116.32 0.40 -10.09 0.03 59071 -116.21 0.69 -10.06 0.17 59072 -116.15 0.82 -9.97 0.24 59073 -116.40 0.82 -9.88 0.24 IAU2000A Celestial Pole Offset Series MJD dX error dY error (msec. of arc) 59062 0.136 0.137 -0.057 0.083 59063 0.128 0.113 -0.048 0.065 59064 0.124 0.113 -0.042 0.065 59065 0.125 0.088 -0.039 0.045 59066 0.131 0.120 -0.039 0.037 59067 0.143 0.120 -0.044 0.037 59068 0.161 0.120 -0.053 0.037 59069 0.183 0.161 -0.067 0.026 59070 0.208 0.161 -0.086 0.026 59071 0.236 0.273 -0.108 0.165 59072 0.267 0.328 -0.132 0.242 59073 0.298 0.328 -0.158 0.242 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).