********************************************************************** * * * I E R S B U L L E T I N - A * * * * Rapid Service/Prediction of Earth Orientation * ********************************************************************** 25 June 2020 Vol. XXXIII No. 026 ______________________________________________________________________ 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 19 59019 0.14488 .00009 0.43813 .00009 -0.248971 0.000015 20 6 20 59020 0.14712 .00009 0.43759 .00009 -0.248096 0.000015 20 6 21 59021 0.14926 .00009 0.43708 .00009 -0.247051 0.000016 20 6 22 59022 0.15110 .00009 0.43652 .00009 -0.245884 0.000013 20 6 23 59023 0.15256 .00009 0.43583 .00009 -0.244687 0.000014 20 6 24 59024 0.15397 .00009 0.43508 .00009 -0.243563 0.000014 20 6 25 59025 0.15540 .00009 0.43449 .00009 -0.242609 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 = 0.1190 + 0.0261 cos A + 0.0907 sin A + 0.0129 cos C - 0.0020 sin C y = 0.3537 + 0.0836 cos A - 0.0269 sin A - 0.0020 cos C - 0.0129 sin C UT1-UTC = -0.2212 - 0.00013 (MJD - 59033) - (UT2-UT1) where A = 2*pi*(MJD-59025)/365.25 and C = 2*pi*(MJD-59025)/435. TAI-UTC(MJD 59026) = 37.0 The accuracy may be estimated from the expressions: S x,y = 0.00068 (MJD-59025)**0.80 S t = 0.00025 (MJD-59025)**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 26 59026 0.1569 0.4339 -0.24192 2020 6 27 59027 0.1584 0.4334 -0.24147 2020 6 28 59028 0.1600 0.4328 -0.24121 2020 6 29 59029 0.1615 0.4323 -0.24104 2020 6 30 59030 0.1631 0.4317 -0.24083 2020 7 1 59031 0.1645 0.4311 -0.24048 2020 7 2 59032 0.1660 0.4305 -0.23990 2020 7 3 59033 0.1675 0.4298 -0.23909 2020 7 4 59034 0.1690 0.4292 -0.23807 2020 7 5 59035 0.1704 0.4284 -0.23694 2020 7 6 59036 0.1719 0.4277 -0.23577 2020 7 7 59037 0.1733 0.4270 -0.23463 2020 7 8 59038 0.1747 0.4262 -0.23353 2020 7 9 59039 0.1761 0.4254 -0.23252 2020 7 10 59040 0.1775 0.4247 -0.23161 2020 7 11 59041 0.1789 0.4239 -0.23080 2020 7 12 59042 0.1802 0.4230 -0.23005 2020 7 13 59043 0.1815 0.4222 -0.22930 2020 7 14 59044 0.1829 0.4213 -0.22851 2020 7 15 59045 0.1842 0.4204 -0.22766 2020 7 16 59046 0.1854 0.4195 -0.22673 2020 7 17 59047 0.1867 0.4185 -0.22572 2020 7 18 59048 0.1879 0.4176 -0.22461 2020 7 19 59049 0.1891 0.4166 -0.22345 2020 7 20 59050 0.1903 0.4156 -0.22230 2020 7 21 59051 0.1915 0.4146 -0.22123 2020 7 22 59052 0.1927 0.4136 -0.22033 2020 7 23 59053 0.1938 0.4125 -0.21968 2020 7 24 59054 0.1949 0.4114 -0.21928 2020 7 25 59055 0.1960 0.4103 -0.21910 2020 7 26 59056 0.1971 0.4092 -0.21904 2020 7 27 59057 0.1981 0.4081 -0.21899 2020 7 28 59058 0.1992 0.4070 -0.21884 2020 7 29 59059 0.2002 0.4058 -0.21852 2020 7 30 59060 0.2012 0.4046 -0.21799 2020 7 31 59061 0.2021 0.4034 -0.21728 2020 8 1 59062 0.2030 0.4022 -0.21644 2020 8 2 59063 0.2039 0.4010 -0.21553 2020 8 3 59064 0.2048 0.3997 -0.21465 2020 8 4 59065 0.2057 0.3985 -0.21385 2020 8 5 59066 0.2065 0.3972 -0.21316 2020 8 6 59067 0.2073 0.3959 -0.21260 2020 8 7 59068 0.2081 0.3946 -0.21214 2020 8 8 59069 0.2089 0.3933 -0.21174 2020 8 9 59070 0.2096 0.3920 -0.21135 2020 8 10 59071 0.2103 0.3906 -0.21095 2020 8 11 59072 0.2110 0.3893 -0.21048 2020 8 12 59073 0.2116 0.3879 -0.20992 2020 8 13 59074 0.2122 0.3866 -0.20925 2020 8 14 59075 0.2128 0.3852 -0.20849 2020 8 15 59076 0.2134 0.3838 -0.20767 2020 8 16 59077 0.2139 0.3824 -0.20681 2020 8 17 59078 0.2144 0.3810 -0.20601 2020 8 18 59079 0.2149 0.3795 -0.20536 2020 8 19 59080 0.2154 0.3781 -0.20492 2020 8 20 59081 0.2158 0.3767 -0.20475 2020 8 21 59082 0.2162 0.3752 -0.20482 2020 8 22 59083 0.2166 0.3738 -0.20504 2020 8 23 59084 0.2169 0.3723 -0.20529 2020 8 24 59085 0.2172 0.3708 -0.20544 2020 8 25 59086 0.2175 0.3694 -0.20540 2020 8 26 59087 0.2178 0.3679 -0.20514 2020 8 27 59088 0.2180 0.3664 -0.20468 2020 8 28 59089 0.2182 0.3649 -0.20407 2020 8 29 59090 0.2183 0.3634 -0.20341 2020 8 30 59091 0.2185 0.3619 -0.20277 2020 8 31 59092 0.2186 0.3604 -0.20222 2020 9 1 59093 0.2186 0.3589 -0.20181 2020 9 2 59094 0.2187 0.3574 -0.20155 2020 9 3 59095 0.2187 0.3559 -0.20143 2020 9 4 59096 0.2187 0.3544 -0.20141 2020 9 5 59097 0.2187 0.3529 -0.20145 2020 9 6 59098 0.2186 0.3514 -0.20149 2020 9 7 59099 0.2185 0.3499 -0.20150 2020 9 8 59100 0.2183 0.3484 -0.20144 2020 9 9 59101 0.2182 0.3469 -0.20127 2020 9 10 59102 0.2180 0.3454 -0.20099 2020 9 11 59103 0.2178 0.3439 -0.20063 2020 9 12 59104 0.2175 0.3424 -0.20022 2020 9 13 59105 0.2172 0.3409 -0.19984 2020 9 14 59106 0.2169 0.3394 -0.19956 2020 9 15 59107 0.2166 0.3379 -0.19948 2020 9 16 59108 0.2162 0.3364 -0.19969 2020 9 17 59109 0.2158 0.3350 -0.20019 2020 9 18 59110 0.2154 0.3335 -0.20094 2020 9 19 59111 0.2150 0.3320 -0.20180 2020 9 20 59112 0.2145 0.3306 -0.20264 2020 9 21 59113 0.2140 0.3291 -0.20332 2020 9 22 59114 0.2134 0.3277 -0.20376 2020 9 23 59115 0.2129 0.3263 -0.20397 2020 9 24 59116 0.2123 0.3248 -0.20400 2020 9 25 59117 0.2117 0.3234 -0.20394 2020 9 26 59118 0.2110 0.3220 -0.20387 2020 9 27 59119 0.2103 0.3206 -0.20387 2020 9 28 59120 0.2096 0.3192 -0.20398 2020 9 29 59121 0.2089 0.3178 -0.20423 2020 9 30 59122 0.2081 0.3165 -0.20460 2020 10 1 59123 0.2073 0.3151 -0.20508 2020 10 2 59124 0.2065 0.3138 -0.20562 2020 10 3 59125 0.2057 0.3125 -0.20618 2020 10 4 59126 0.2048 0.3111 -0.20671 2020 10 5 59127 0.2039 0.3098 -0.20715 2020 10 6 59128 0.2030 0.3085 -0.20749 2020 10 7 59129 0.2021 0.3073 -0.20772 2020 10 8 59130 0.2011 0.3060 -0.20784 2020 10 9 59131 0.2001 0.3048 -0.20789 2020 10 10 59132 0.1991 0.3035 -0.20792 2020 10 11 59133 0.1981 0.3023 -0.20802 2020 10 12 59134 0.1970 0.3011 -0.20822 2020 10 13 59135 0.1959 0.2999 -0.20867 2020 10 14 59136 0.1948 0.2988 -0.20940 2020 10 15 59137 0.1937 0.2976 -0.21041 2020 10 16 59138 0.1925 0.2965 -0.21161 2020 10 17 59139 0.1914 0.2954 -0.21286 2020 10 18 59140 0.1902 0.2943 -0.21400 2020 10 19 59141 0.1890 0.2932 -0.21490 2020 10 20 59142 0.1877 0.2921 -0.21553 2020 10 21 59143 0.1865 0.2911 -0.21591 2020 10 22 59144 0.1852 0.2901 -0.21614 2020 10 23 59145 0.1839 0.2891 -0.21631 2020 10 24 59146 0.1826 0.2881 -0.21651 2020 10 25 59147 0.1812 0.2871 -0.21680 2020 10 26 59148 0.1799 0.2862 -0.21722 2020 10 27 59149 0.1785 0.2853 -0.21776 2020 10 28 59150 0.1771 0.2844 -0.21840 2020 10 29 59151 0.1757 0.2835 -0.21910 2020 10 30 59152 0.1743 0.2827 -0.21982 2020 10 31 59153 0.1728 0.2819 -0.22051 2020 11 1 59154 0.1714 0.2811 -0.22111 2020 11 2 59155 0.1699 0.2803 -0.22160 2020 11 3 59156 0.1684 0.2795 -0.22195 2020 11 4 59157 0.1669 0.2788 -0.22217 2020 11 5 59158 0.1654 0.2781 -0.22229 2020 11 6 59159 0.1638 0.2774 -0.22236 2020 11 7 59160 0.1623 0.2767 -0.22246 2020 11 8 59161 0.1607 0.2761 -0.22266 2020 11 9 59162 0.1592 0.2755 -0.22303 2020 11 10 59163 0.1576 0.2749 -0.22365 2020 11 11 59164 0.1560 0.2744 -0.22453 2020 11 12 59165 0.1544 0.2738 -0.22564 2020 11 13 59166 0.1528 0.2733 -0.22687 2020 11 14 59167 0.1511 0.2728 -0.22807 2020 11 15 59168 0.1495 0.2724 -0.22909 2020 11 16 59169 0.1479 0.2719 -0.22985 2020 11 17 59170 0.1462 0.2715 -0.23033 2020 11 18 59171 0.1445 0.2712 -0.23060 2020 11 19 59172 0.1429 0.2708 -0.23076 2020 11 20 59173 0.1412 0.2705 -0.23090 2020 11 21 59174 0.1395 0.2702 -0.23111 2020 11 22 59175 0.1378 0.2699 -0.23143 2020 11 23 59176 0.1361 0.2697 -0.23185 2020 11 24 59177 0.1344 0.2694 -0.23237 2020 11 25 59178 0.1327 0.2693 -0.23295 2020 11 26 59179 0.1310 0.2691 -0.23354 2020 11 27 59180 0.1293 0.2690 -0.23409 2020 11 28 59181 0.1276 0.2688 -0.23457 2020 11 29 59182 0.1259 0.2688 -0.23493 2020 11 30 59183 0.1242 0.2687 -0.23514 2020 12 1 59184 0.1225 0.2687 -0.23521 2020 12 2 59185 0.1208 0.2687 -0.23516 2020 12 3 59186 0.1190 0.2687 -0.23504 2020 12 4 59187 0.1173 0.2688 -0.23490 2020 12 5 59188 0.1156 0.2689 -0.23484 2020 12 6 59189 0.1139 0.2690 -0.23492 2020 12 7 59190 0.1122 0.2691 -0.23520 2020 12 8 59191 0.1105 0.2693 -0.23572 2020 12 9 59192 0.1088 0.2695 -0.23644 2020 12 10 59193 0.1070 0.2697 -0.23732 2020 12 11 59194 0.1053 0.2700 -0.23822 2020 12 12 59195 0.1037 0.2702 -0.23902 2020 12 13 59196 0.1020 0.2705 -0.23961 2020 12 14 59197 0.1003 0.2709 -0.23995 2020 12 15 59198 0.0986 0.2712 -0.24006 2020 12 16 59199 0.0969 0.2716 -0.24002 2020 12 17 59200 0.0953 0.2720 -0.23994 2020 12 18 59201 0.0936 0.2725 -0.23991 2020 12 19 59202 0.0920 0.2730 -0.23999 2020 12 20 59203 0.0903 0.2735 -0.24020 2020 12 21 59204 0.0887 0.2740 -0.24052 2020 12 22 59205 0.0871 0.2745 -0.24092 2020 12 23 59206 0.0854 0.2751 -0.24137 2020 12 24 59207 0.0838 0.2757 -0.24181 2020 12 25 59208 0.0823 0.2763 -0.24222 2020 12 26 59209 0.0807 0.2770 -0.24254 2020 12 27 59210 0.0791 0.2777 -0.24276 2020 12 28 59211 0.0776 0.2784 -0.24289 2020 12 29 59212 0.0760 0.2791 -0.24293 2020 12 30 59213 0.0745 0.2799 -0.24294 2020 12 31 59214 0.0730 0.2807 -0.24297 2021 1 1 59215 0.0715 0.2815 -0.24308 2021 1 2 59216 0.0700 0.2823 -0.24336 2021 1 3 59217 0.0685 0.2831 -0.24384 2021 1 4 59218 0.0671 0.2840 -0.24453 2021 1 5 59219 0.0657 0.2849 -0.24542 2021 1 6 59220 0.0642 0.2859 -0.24644 2021 1 7 59221 0.0628 0.2868 -0.24747 2021 1 8 59222 0.0615 0.2878 -0.24841 2021 1 9 59223 0.0601 0.2888 -0.24914 2021 1 10 59224 0.0588 0.2898 -0.24961 2021 1 11 59225 0.0574 0.2908 -0.24983 2021 1 12 59226 0.0561 0.2919 -0.24986 2021 1 13 59227 0.0548 0.2930 -0.24980 2021 1 14 59228 0.0536 0.2941 -0.24977 2021 1 15 59229 0.0523 0.2952 -0.24983 2021 1 16 59230 0.0511 0.2964 -0.24999 2021 1 17 59231 0.0499 0.2975 -0.25024 2021 1 18 59232 0.0487 0.2987 -0.25054 2021 1 19 59233 0.0476 0.2999 -0.25083 2021 1 20 59234 0.0464 0.3012 -0.25107 2021 1 21 59235 0.0453 0.3024 -0.25124 2021 1 22 59236 0.0442 0.3037 -0.25130 2021 1 23 59237 0.0432 0.3049 -0.25124 2021 1 24 59238 0.0421 0.3062 -0.25106 2021 1 25 59239 0.0411 0.3076 -0.25077 2021 1 26 59240 0.0401 0.3089 -0.25042 2021 1 27 59241 0.0392 0.3103 -0.25006 2021 1 28 59242 0.0382 0.3116 -0.24978 2021 1 29 59243 0.0373 0.3130 -0.24963 2021 1 30 59244 0.0364 0.3144 -0.24967 2021 1 31 59245 0.0356 0.3158 -0.24998 2021 2 1 59246 0.0347 0.3173 -0.25054 2021 2 2 59247 0.0339 0.3187 -0.25130 2021 2 3 59248 0.0331 0.3202 -0.25211 2021 2 4 59249 0.0324 0.3216 -0.25285 2021 2 5 59250 0.0317 0.3231 -0.25345 2021 2 6 59251 0.0310 0.3246 -0.25382 2021 2 7 59252 0.0303 0.3261 -0.25390 2021 2 8 59253 0.0296 0.3276 -0.25375 2021 2 9 59254 0.0290 0.3292 -0.25356 2021 2 10 59255 0.0284 0.3307 -0.25342 2021 2 11 59256 0.0279 0.3323 -0.25336 2021 2 12 59257 0.0274 0.3338 -0.25345 2021 2 13 59258 0.0269 0.3354 -0.25373 2021 2 14 59259 0.0264 0.3370 -0.25412 2021 2 15 59260 0.0260 0.3386 -0.25452 2021 2 16 59261 0.0256 0.3402 -0.25496 2021 2 17 59262 0.0252 0.3418 -0.25540 2021 2 18 59263 0.0248 0.3434 -0.25582 2021 2 19 59264 0.0245 0.3450 -0.25623 2021 2 20 59265 0.0242 0.3467 -0.25651 2021 2 21 59266 0.0240 0.3483 -0.25666 2021 2 22 59267 0.0238 0.3499 -0.25670 2021 2 23 59268 0.0236 0.3516 -0.25670 2021 2 24 59269 0.0234 0.3532 -0.25675 2021 2 25 59270 0.0233 0.3549 -0.25689 2021 2 26 59271 0.0232 0.3565 -0.25720 2021 2 27 59272 0.0231 0.3582 -0.25770 2021 2 28 59273 0.0231 0.3598 -0.25843 2021 3 1 59274 0.0230 0.3615 -0.25933 2021 3 2 59275 0.0231 0.3632 -0.26033 2021 3 3 59276 0.0231 0.3648 -0.26133 2021 3 4 59277 0.0232 0.3665 -0.26214 2021 3 5 59278 0.0233 0.3681 -0.26267 2021 3 6 59279 0.0235 0.3698 -0.26293 2021 3 7 59280 0.0237 0.3715 -0.26296 2021 3 8 59281 0.0239 0.3731 -0.26288 2021 3 9 59282 0.0241 0.3748 -0.26281 2021 3 10 59283 0.0244 0.3764 -0.26287 2021 3 11 59284 0.0247 0.3781 -0.26310 2021 3 12 59285 0.0250 0.3797 -0.26347 2021 3 13 59286 0.0254 0.3814 -0.26396 2021 3 14 59287 0.0258 0.3830 -0.26454 2021 3 15 59288 0.0262 0.3847 -0.26519 2021 3 16 59289 0.0267 0.3863 -0.26588 2021 3 17 59290 0.0272 0.3879 -0.26653 2021 3 18 59291 0.0277 0.3895 -0.26710 2021 3 19 59292 0.0282 0.3911 -0.26755 2021 3 20 59293 0.0288 0.3927 -0.26783 2021 3 21 59294 0.0294 0.3943 -0.26795 2021 3 22 59295 0.0301 0.3959 -0.26792 2021 3 23 59296 0.0307 0.3975 -0.26780 2021 3 24 59297 0.0314 0.3990 -0.26770 2021 3 25 59298 0.0322 0.4006 -0.26773 2021 3 26 59299 0.0329 0.4021 -0.26799 2021 3 27 59300 0.0337 0.4037 -0.26847 2021 3 28 59301 0.0345 0.4052 -0.26919 2021 3 29 59302 0.0354 0.4067 -0.27008 2021 3 30 59303 0.0362 0.4082 -0.27102 2021 3 31 59304 0.0371 0.4097 -0.27182 2021 4 1 59305 0.0381 0.4112 -0.27239 2021 4 2 59306 0.0390 0.4126 -0.27267 2021 4 3 59307 0.0400 0.4141 -0.27271 2021 4 4 59308 0.0410 0.4155 -0.27257 2021 4 5 59309 0.0421 0.4169 -0.27243 2021 4 6 59310 0.0431 0.4183 -0.27244 2021 4 7 59311 0.0442 0.4197 -0.27259 2021 4 8 59312 0.0453 0.4211 -0.27291 2021 4 9 59313 0.0465 0.4224 -0.27341 2021 4 10 59314 0.0476 0.4238 -0.27398 2021 4 11 59315 0.0488 0.4251 -0.27454 2021 4 12 59316 0.0500 0.4264 -0.27502 2021 4 13 59317 0.0513 0.4276 -0.27543 2021 4 14 59318 0.0526 0.4289 -0.27573 2021 4 15 59319 0.0538 0.4301 -0.27587 2021 4 16 59320 0.0552 0.4314 -0.27587 2021 4 17 59321 0.0565 0.4326 -0.27576 2021 4 18 59322 0.0579 0.4338 -0.27558 2021 4 19 59323 0.0592 0.4349 -0.27539 2021 4 20 59324 0.0606 0.4361 -0.27524 2021 4 21 59325 0.0621 0.4372 -0.27525 2021 4 22 59326 0.0635 0.4383 -0.27555 2021 4 23 59327 0.0650 0.4393 -0.27610 2021 4 24 59328 0.0665 0.4404 -0.27690 2021 4 25 59329 0.0680 0.4414 -0.27793 2021 4 26 59330 0.0695 0.4424 -0.27915 2021 4 27 59331 0.0710 0.4434 -0.28035 2021 4 28 59332 0.0726 0.4444 -0.28140 2021 4 29 59333 0.0742 0.4453 -0.28225 2021 4 30 59334 0.0758 0.4462 -0.28279 2021 5 1 59335 0.0774 0.4471 -0.28314 2021 5 2 59336 0.0790 0.4480 -0.28342 2021 5 3 59337 0.0807 0.4488 -0.28368 2021 5 4 59338 0.0823 0.4496 -0.28396 2021 5 5 59339 0.0840 0.4504 -0.28439 2021 5 6 59340 0.0857 0.4512 -0.28489 2021 5 7 59341 0.0874 0.4519 -0.28543 2021 5 8 59342 0.0891 0.4526 -0.28604 2021 5 9 59343 0.0909 0.4533 -0.28668 2021 5 10 59344 0.0926 0.4539 -0.28728 2021 5 11 59345 0.0944 0.4546 -0.28775 2021 5 12 59346 0.0962 0.4552 -0.28809 2021 5 13 59347 0.0979 0.4557 -0.28830 2021 5 14 59348 0.0997 0.4563 -0.28838 2021 5 15 59349 0.1015 0.4568 -0.28826 2021 5 16 59350 0.1034 0.4573 -0.28804 2021 5 17 59351 0.1052 0.4577 -0.28776 2021 5 18 59352 0.1070 0.4582 -0.28752 2021 5 19 59353 0.1089 0.4586 -0.28743 2021 5 20 59354 0.1107 0.4589 -0.28758 2021 5 21 59355 0.1126 0.4593 -0.28800 2021 5 22 59356 0.1144 0.4596 -0.28874 2021 5 23 59357 0.1163 0.4599 -0.28963 2021 5 24 59358 0.1182 0.4601 -0.29049 2021 5 25 59359 0.1200 0.4604 -0.29120 2021 5 26 59360 0.1219 0.4606 -0.29174 2021 5 27 59361 0.1238 0.4607 -0.29199 2021 5 28 59362 0.1257 0.4609 -0.29201 2021 5 29 59363 0.1276 0.4610 -0.29192 2021 5 30 59364 0.1295 0.4611 -0.29183 2021 5 31 59365 0.1314 0.4611 -0.29179 2021 6 1 59366 0.1333 0.4611 -0.29185 2021 6 2 59367 0.1352 0.4611 -0.29201 2021 6 3 59368 0.1371 0.4611 -0.29224 2021 6 4 59369 0.1390 0.4610 -0.29250 2021 6 5 59370 0.1409 0.4609 -0.29275 2021 6 6 59371 0.1428 0.4608 -0.29294 2021 6 7 59372 0.1447 0.4606 -0.29302 2021 6 8 59373 0.1466 0.4604 -0.29295 2021 6 9 59374 0.1484 0.4602 -0.29274 2021 6 10 59375 0.1503 0.4600 -0.29235 2021 6 11 59376 0.1522 0.4597 -0.29176 2021 6 12 59377 0.1541 0.4594 -0.29105 2021 6 13 59378 0.1559 0.4591 -0.29033 2021 6 14 59379 0.1578 0.4587 -0.28966 2021 6 15 59380 0.1597 0.4583 -0.28903 2021 6 16 59381 0.1615 0.4579 -0.28864 2021 6 17 59382 0.1633 0.4574 -0.28854 2021 6 18 59383 0.1652 0.4569 -0.28862 2021 6 19 59384 0.1670 0.4564 -0.28884 2021 6 20 59385 0.1688 0.4559 -0.28911 2021 6 21 59386 0.1706 0.4553 -0.28930 2021 6 22 59387 0.1724 0.4547 -0.28926 2021 6 23 59388 0.1742 0.4541 -0.28898 2021 6 24 59389 0.1760 0.4534 -0.28849 2021 6 25 59390 0.1777 0.4527 -0.28786 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) 58999 -106.03 0.29 -10.74 0.17 59000 -105.75 0.60 -10.54 0.22 59001 -105.95 0.38 -10.27 0.17 59002 -106.62 0.22 -10.07 0.14 59003 -107.47 0.24 -10.04 0.15 59004 -108.11 0.24 -10.16 0.15 59005 -108.34 0.24 -10.25 0.15 59006 -108.18 0.24 -10.21 0.15 59007 -107.84 0.26 -10.13 0.13 59008 -107.51 0.26 -10.18 0.13 59009 -107.35 0.25 -10.37 0.11 IAU2000A Celestial Pole Offset Series MJD dX error dY error (msec. of arc) 58999 0.087 0.116 -0.142 0.169 59000 0.093 0.240 -0.147 0.222 59001 0.095 0.150 -0.148 0.169 59002 0.095 0.086 -0.147 0.140 59003 0.094 0.097 -0.142 0.150 59004 0.095 0.097 -0.136 0.150 59005 0.097 0.097 -0.127 0.150 59006 0.100 0.097 -0.114 0.150 59007 0.102 0.102 -0.098 0.130 59008 0.104 0.102 -0.079 0.130 59009 0.106 0.098 -0.059 0.114 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).