********************************************************************** * * * I E R S B U L L E T I N - A * * * * Rapid Service/Prediction of Earth Orientation * ********************************************************************** 21 May 2020 Vol. XXXIII No. 021 ______________________________________________________________________ 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. * * * * Currently, 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. * * * * 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. * * * * As of Bulletin A Vol. XXXIII, No. 021, 21 May 2020, we have fully * * incorporated the new NASA Goddard VLBI solutions -- gsf2020a.eoxy * * gsf2020a.eopi. The effect appears to be less than 0.1 mas in polar * * motion and 10 us in UT1-UTC. In addition small updates to system- * * atic corrections for celestial pole offsets were made for the NASA * * Goddard and IVS combined 24 hour VLBI series. * * * * 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 5 15 58984 0.09881 .00009 0.44641 .00009 -0.250767 0.000017 20 5 16 58985 0.10031 .00009 0.44628 .00009 -0.251081 0.000016 20 5 17 58986 0.10170 .00009 0.44612 .00009 -0.251486 0.000014 20 5 18 58987 0.10305 .00009 0.44599 .00009 -0.252003 0.000013 20 5 19 58988 0.10451 .00009 0.44589 .00009 -0.252603 0.000013 20 5 20 58989 0.10604 .00009 0.44598 .00009 -0.253150 0.000014 20 5 21 58990 0.10740 .00009 0.44641 .00009 -0.253624 0.000014 _______________________________________________________________________ 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 = 0.1214 - 0.0363 cos A + 0.1024 sin A + 0.0254 cos C - 0.0020 sin C y = 0.3519 + 0.0947 cos A + 0.0339 sin A - 0.0020 cos C - 0.0254 sin C UT1-UTC = -0.2227 - 0.00014 (MJD - 58998) - (UT2-UT1) where A = 2*pi*(MJD-58990)/365.25 and C = 2*pi*(MJD-58990)/435. TAI-UTC(MJD 58991) = 37.0 The accuracy may be estimated from the expressions: S x,y = 0.00068 (MJD-58990)**0.80 S t = 0.00025 (MJD-58990)**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 5 22 58991 0.1087 0.4468 -0.25395 2020 5 23 58992 0.1101 0.4472 -0.25412 2020 5 24 58993 0.1115 0.4474 -0.25412 2020 5 25 58994 0.1131 0.4476 -0.25398 2020 5 26 58995 0.1148 0.4477 -0.25378 2020 5 27 58996 0.1165 0.4478 -0.25356 2020 5 28 58997 0.1183 0.4480 -0.25342 2020 5 29 58998 0.1201 0.4481 -0.25344 2020 5 30 58999 0.1219 0.4483 -0.25366 2020 5 31 59000 0.1236 0.4484 -0.25409 2020 6 1 59001 0.1253 0.4485 -0.25471 2020 6 2 59002 0.1271 0.4485 -0.25541 2020 6 3 59003 0.1288 0.4485 -0.25608 2020 6 4 59004 0.1306 0.4484 -0.25659 2020 6 5 59005 0.1324 0.4484 -0.25684 2020 6 6 59006 0.1342 0.4483 -0.25682 2020 6 7 59007 0.1361 0.4483 -0.25660 2020 6 8 59008 0.1379 0.4482 -0.25625 2020 6 9 59009 0.1397 0.4480 -0.25585 2020 6 10 59010 0.1415 0.4479 -0.25546 2020 6 11 59011 0.1432 0.4477 -0.25512 2020 6 12 59012 0.1450 0.4475 -0.25486 2020 6 13 59013 0.1468 0.4472 -0.25467 2020 6 14 59014 0.1486 0.4469 -0.25452 2020 6 15 59015 0.1504 0.4466 -0.25437 2020 6 16 59016 0.1522 0.4463 -0.25418 2020 6 17 59017 0.1540 0.4459 -0.25390 2020 6 18 59018 0.1557 0.4455 -0.25350 2020 6 19 59019 0.1575 0.4451 -0.25295 2020 6 20 59020 0.1592 0.4446 -0.25225 2020 6 21 59021 0.1610 0.4442 -0.25142 2020 6 22 59022 0.1627 0.4436 -0.25052 2020 6 23 59023 0.1644 0.4431 -0.24963 2020 6 24 59024 0.1662 0.4425 -0.24881 2020 6 25 59025 0.1679 0.4419 -0.24816 2020 6 26 59026 0.1696 0.4413 -0.24770 2020 6 27 59027 0.1712 0.4407 -0.24745 2020 6 28 59028 0.1729 0.4400 -0.24735 2020 6 29 59029 0.1746 0.4393 -0.24732 2020 6 30 59030 0.1762 0.4386 -0.24725 2020 7 1 59031 0.1778 0.4378 -0.24703 2020 7 2 59032 0.1795 0.4370 -0.24661 2020 7 3 59033 0.1811 0.4362 -0.24594 2020 7 4 59034 0.1827 0.4354 -0.24507 2020 7 5 59035 0.1842 0.4345 -0.24406 2020 7 6 59036 0.1858 0.4336 -0.24302 2020 7 7 59037 0.1873 0.4327 -0.24200 2020 7 8 59038 0.1888 0.4318 -0.24108 2020 7 9 59039 0.1904 0.4308 -0.24028 2020 7 10 59040 0.1918 0.4298 -0.23960 2020 7 11 59041 0.1933 0.4288 -0.23901 2020 7 12 59042 0.1948 0.4278 -0.23848 2020 7 13 59043 0.1962 0.4267 -0.23797 2020 7 14 59044 0.1976 0.4256 -0.23743 2020 7 15 59045 0.1990 0.4245 -0.23681 2020 7 16 59046 0.2004 0.4234 -0.23609 2020 7 17 59047 0.2017 0.4222 -0.23525 2020 7 18 59048 0.2030 0.4210 -0.23430 2020 7 19 59049 0.2043 0.4198 -0.23326 2020 7 20 59050 0.2056 0.4186 -0.23220 2020 7 21 59051 0.2069 0.4174 -0.23119 2020 7 22 59052 0.2081 0.4161 -0.23033 2020 7 23 59053 0.2093 0.4148 -0.22969 2020 7 24 59054 0.2105 0.4135 -0.22929 2020 7 25 59055 0.2117 0.4122 -0.22908 2020 7 26 59056 0.2128 0.4109 -0.22898 2020 7 27 59057 0.2139 0.4095 -0.22887 2020 7 28 59058 0.2150 0.4081 -0.22867 2020 7 29 59059 0.2161 0.4067 -0.22829 2020 7 30 59060 0.2171 0.4053 -0.22772 2020 7 31 59061 0.2181 0.4039 -0.22696 2020 8 1 59062 0.2191 0.4025 -0.22608 2020 8 2 59063 0.2200 0.4010 -0.22517 2020 8 3 59064 0.2210 0.3995 -0.22429 2020 8 4 59065 0.2219 0.3980 -0.22350 2020 8 5 59066 0.2227 0.3965 -0.22284 2020 8 6 59067 0.2236 0.3950 -0.22231 2020 8 7 59068 0.2244 0.3934 -0.22188 2020 8 8 59069 0.2252 0.3919 -0.22153 2020 8 9 59070 0.2259 0.3903 -0.22120 2020 8 10 59071 0.2266 0.3888 -0.22086 2020 8 11 59072 0.2273 0.3872 -0.22047 2020 8 12 59073 0.2280 0.3856 -0.21999 2020 8 13 59074 0.2286 0.3840 -0.21942 2020 8 14 59075 0.2292 0.3823 -0.21874 2020 8 15 59076 0.2298 0.3807 -0.21799 2020 8 16 59077 0.2303 0.3791 -0.21721 2020 8 17 59078 0.2308 0.3774 -0.21648 2020 8 18 59079 0.2313 0.3757 -0.21589 2020 8 19 59080 0.2318 0.3741 -0.21551 2020 8 20 59081 0.2322 0.3724 -0.21541 2020 8 21 59082 0.2326 0.3707 -0.21555 2020 8 22 59083 0.2329 0.3690 -0.21584 2020 8 23 59084 0.2332 0.3673 -0.21617 2020 8 24 59085 0.2335 0.3656 -0.21640 2020 8 25 59086 0.2338 0.3639 -0.21645 2020 8 26 59087 0.2340 0.3622 -0.21627 2020 8 27 59088 0.2342 0.3605 -0.21588 2020 8 28 59089 0.2343 0.3588 -0.21535 2020 8 29 59090 0.2345 0.3571 -0.21475 2020 8 30 59091 0.2345 0.3553 -0.21416 2020 8 31 59092 0.2346 0.3536 -0.21365 2020 9 1 59093 0.2346 0.3519 -0.21327 2020 9 2 59094 0.2346 0.3501 -0.21303 2020 9 3 59095 0.2346 0.3484 -0.21292 2020 9 4 59096 0.2345 0.3467 -0.21290 2020 9 5 59097 0.2344 0.3449 -0.21294 2020 9 6 59098 0.2343 0.3432 -0.21299 2020 9 7 59099 0.2341 0.3415 -0.21301 2020 9 8 59100 0.2339 0.3398 -0.21294 2020 9 9 59101 0.2336 0.3380 -0.21278 2020 9 10 59102 0.2334 0.3363 -0.21252 2020 9 11 59103 0.2331 0.3346 -0.21217 2020 9 12 59104 0.2327 0.3329 -0.21178 2020 9 13 59105 0.2324 0.3312 -0.21140 2020 9 14 59106 0.2320 0.3295 -0.21114 2020 9 15 59107 0.2315 0.3278 -0.21108 2020 9 16 59108 0.2311 0.3261 -0.21129 2020 9 17 59109 0.2306 0.3244 -0.21179 2020 9 18 59110 0.2300 0.3228 -0.21253 2020 9 19 59111 0.2295 0.3211 -0.21338 2020 9 20 59112 0.2289 0.3194 -0.21419 2020 9 21 59113 0.2283 0.3178 -0.21483 2020 9 22 59114 0.2276 0.3162 -0.21522 2020 9 23 59115 0.2269 0.3145 -0.21537 2020 9 24 59116 0.2262 0.3129 -0.21532 2020 9 25 59117 0.2254 0.3113 -0.21517 2020 9 26 59118 0.2247 0.3097 -0.21501 2020 9 27 59119 0.2238 0.3081 -0.21492 2020 9 28 59120 0.2230 0.3066 -0.21494 2020 9 29 59121 0.2221 0.3050 -0.21509 2020 9 30 59122 0.2212 0.3035 -0.21538 2020 10 1 59123 0.2203 0.3019 -0.21578 2020 10 2 59124 0.2193 0.3004 -0.21624 2020 10 3 59125 0.2183 0.2989 -0.21671 2020 10 4 59126 0.2173 0.2974 -0.21715 2020 10 5 59127 0.2163 0.2960 -0.21750 2020 10 6 59128 0.2152 0.2945 -0.21774 2020 10 7 59129 0.2141 0.2931 -0.21787 2020 10 8 59130 0.2130 0.2917 -0.21788 2020 10 9 59131 0.2118 0.2903 -0.21783 2020 10 10 59132 0.2106 0.2889 -0.21776 2020 10 11 59133 0.2094 0.2875 -0.21776 2020 10 12 59134 0.2082 0.2862 -0.21790 2020 10 13 59135 0.2069 0.2849 -0.21829 2020 10 14 59136 0.2056 0.2836 -0.21896 2020 10 15 59137 0.2043 0.2823 -0.21990 2020 10 16 59138 0.2030 0.2810 -0.22104 2020 10 17 59139 0.2016 0.2798 -0.22222 2020 10 18 59140 0.2002 0.2786 -0.22329 2020 10 19 59141 0.1988 0.2774 -0.22413 2020 10 20 59142 0.1974 0.2762 -0.22469 2020 10 21 59143 0.1959 0.2750 -0.22500 2020 10 22 59144 0.1944 0.2739 -0.22516 2020 10 23 59145 0.1929 0.2728 -0.22525 2020 10 24 59146 0.1914 0.2717 -0.22537 2020 10 25 59147 0.1899 0.2707 -0.22558 2020 10 26 59148 0.1883 0.2696 -0.22592 2020 10 27 59149 0.1867 0.2686 -0.22636 2020 10 28 59150 0.1851 0.2677 -0.22691 2020 10 29 59151 0.1835 0.2667 -0.22752 2020 10 30 59152 0.1819 0.2658 -0.22815 2020 10 31 59153 0.1802 0.2649 -0.22874 2020 11 1 59154 0.1785 0.2640 -0.22924 2020 11 2 59155 0.1768 0.2631 -0.22963 2020 11 3 59156 0.1751 0.2623 -0.22988 2020 11 4 59157 0.1734 0.2615 -0.23001 2020 11 5 59158 0.1717 0.2607 -0.23004 2020 11 6 59159 0.1699 0.2600 -0.23003 2020 11 7 59160 0.1681 0.2593 -0.23004 2020 11 8 59161 0.1663 0.2586 -0.23016 2020 11 9 59162 0.1645 0.2579 -0.23046 2020 11 10 59163 0.1627 0.2573 -0.23102 2020 11 11 59164 0.1609 0.2567 -0.23185 2020 11 12 59165 0.1591 0.2561 -0.23292 2020 11 13 59166 0.1572 0.2556 -0.23411 2020 11 14 59167 0.1553 0.2551 -0.23529 2020 11 15 59168 0.1535 0.2546 -0.23631 2020 11 16 59169 0.1516 0.2541 -0.23709 2020 11 17 59170 0.1497 0.2537 -0.23761 2020 11 18 59171 0.1478 0.2533 -0.23793 2020 11 19 59172 0.1459 0.2530 -0.23818 2020 11 20 59173 0.1440 0.2526 -0.23844 2020 11 21 59174 0.1420 0.2523 -0.23881 2020 11 22 59175 0.1401 0.2521 -0.23931 2020 11 23 59176 0.1382 0.2518 -0.23998 2020 11 24 59177 0.1362 0.2516 -0.24077 2020 11 25 59178 0.1343 0.2515 -0.24167 2020 11 26 59179 0.1323 0.2513 -0.24260 2020 11 27 59180 0.1304 0.2512 -0.24351 2020 11 28 59181 0.1284 0.2511 -0.24432 2020 11 29 59182 0.1265 0.2511 -0.24497 2020 11 30 59183 0.1245 0.2510 -0.24541 2020 12 1 59184 0.1226 0.2510 -0.24564 2020 12 2 59185 0.1206 0.2511 -0.24568 2020 12 3 59186 0.1186 0.2512 -0.24559 2020 12 4 59187 0.1167 0.2513 -0.24544 2020 12 5 59188 0.1147 0.2514 -0.24532 2020 12 6 59189 0.1128 0.2516 -0.24532 2020 12 7 59190 0.1108 0.2518 -0.24552 2020 12 8 59191 0.1088 0.2520 -0.24594 2020 12 9 59192 0.1069 0.2523 -0.24658 2020 12 10 59193 0.1050 0.2526 -0.24735 2020 12 11 59194 0.1030 0.2529 -0.24816 2020 12 12 59195 0.1011 0.2532 -0.24887 2020 12 13 59196 0.0991 0.2536 -0.24938 2020 12 14 59197 0.0972 0.2541 -0.24966 2020 12 15 59198 0.0953 0.2545 -0.24972 2020 12 16 59199 0.0934 0.2550 -0.24965 2020 12 17 59200 0.0915 0.2555 -0.24954 2020 12 18 59201 0.0896 0.2560 -0.24946 2020 12 19 59202 0.0877 0.2566 -0.24947 2020 12 20 59203 0.0858 0.2572 -0.24957 2020 12 21 59204 0.0840 0.2578 -0.24974 2020 12 22 59205 0.0821 0.2585 -0.24994 2020 12 23 59206 0.0803 0.2592 -0.25016 2020 12 24 59207 0.0785 0.2599 -0.25033 2020 12 25 59208 0.0766 0.2607 -0.25041 2020 12 26 59209 0.0748 0.2615 -0.25034 2020 12 27 59210 0.0731 0.2623 -0.25011 2020 12 28 59211 0.0713 0.2631 -0.24973 2020 12 29 59212 0.0695 0.2640 -0.24924 2020 12 30 59213 0.0678 0.2649 -0.24872 2020 12 31 59214 0.0661 0.2658 -0.24821 2021 1 1 59215 0.0643 0.2667 -0.24776 2021 1 2 59216 0.0626 0.2677 -0.24741 2021 1 3 59217 0.0610 0.2687 -0.24725 2021 1 4 59218 0.0593 0.2698 -0.24734 2021 1 5 59219 0.0577 0.2708 -0.24769 2021 1 6 59220 0.0561 0.2719 -0.24823 2021 1 7 59221 0.0545 0.2730 -0.24884 2021 1 8 59222 0.0529 0.2742 -0.24942 2021 1 9 59223 0.0513 0.2753 -0.24980 2021 1 10 59224 0.0498 0.2765 -0.24992 2021 1 11 59225 0.0482 0.2777 -0.24975 2021 1 12 59226 0.0468 0.2790 -0.24933 2021 1 13 59227 0.0453 0.2802 -0.24881 2021 1 14 59228 0.0438 0.2815 -0.24829 2021 1 15 59229 0.0424 0.2828 -0.24787 2021 1 16 59230 0.0410 0.2842 -0.24754 2021 1 17 59231 0.0396 0.2855 -0.24730 2021 1 18 59232 0.0383 0.2869 -0.24717 2021 1 19 59233 0.0369 0.2883 -0.24710 2021 1 20 59234 0.0356 0.2897 -0.24702 2021 1 21 59235 0.0343 0.2912 -0.24688 2021 1 22 59236 0.0331 0.2927 -0.24664 2021 1 23 59237 0.0319 0.2941 -0.24628 2021 1 24 59238 0.0307 0.2956 -0.24577 2021 1 25 59239 0.0295 0.2972 -0.24520 2021 1 26 59240 0.0283 0.2987 -0.24465 2021 1 27 59241 0.0272 0.3003 -0.24411 2021 1 28 59242 0.0261 0.3019 -0.24365 2021 1 29 59243 0.0251 0.3035 -0.24336 2021 1 30 59244 0.0241 0.3051 -0.24325 2021 1 31 59245 0.0231 0.3067 -0.24333 2021 2 1 59246 0.0221 0.3084 -0.24356 2021 2 2 59247 0.0212 0.3100 -0.24395 2021 2 3 59248 0.0202 0.3117 -0.24442 2021 2 4 59249 0.0194 0.3134 -0.24482 2021 2 5 59250 0.0185 0.3151 -0.24509 2021 2 6 59251 0.0177 0.3168 -0.24518 2021 2 7 59252 0.0169 0.3186 -0.24509 2021 2 8 59253 0.0162 0.3203 -0.24488 2021 2 9 59254 0.0154 0.3221 -0.24461 2021 2 10 59255 0.0148 0.3239 -0.24442 2021 2 11 59256 0.0141 0.3257 -0.24442 2021 2 12 59257 0.0135 0.3275 -0.24459 2021 2 13 59258 0.0129 0.3293 -0.24488 2021 2 14 59259 0.0123 0.3311 -0.24531 2021 2 15 59260 0.0118 0.3329 -0.24591 2021 2 16 59261 0.0113 0.3348 -0.24654 2021 2 17 59262 0.0109 0.3366 -0.24719 2021 2 18 59263 0.0104 0.3385 -0.24785 2021 2 19 59264 0.0101 0.3403 -0.24837 2021 2 20 59265 0.0097 0.3422 -0.24879 2021 2 21 59266 0.0094 0.3441 -0.24912 2021 2 22 59267 0.0091 0.3459 -0.24934 2021 2 23 59268 0.0088 0.3478 -0.24946 2021 2 24 59269 0.0086 0.3497 -0.24963 2021 2 25 59270 0.0085 0.3516 -0.24986 2021 2 26 59271 0.0083 0.3535 -0.25024 2021 2 27 59272 0.0082 0.3554 -0.25091 2021 2 28 59273 0.0081 0.3573 -0.25187 2021 3 1 59274 0.0081 0.3592 -0.25308 2021 3 2 59275 0.0081 0.3611 -0.25439 2021 3 3 59276 0.0081 0.3630 -0.25568 2021 3 4 59277 0.0082 0.3649 -0.25687 2021 3 5 59278 0.0083 0.3668 -0.25785 2021 3 6 59279 0.0084 0.3687 -0.25853 2021 3 7 59280 0.0086 0.3706 -0.25899 2021 3 8 59281 0.0088 0.3725 -0.25931 2021 3 9 59282 0.0090 0.3744 -0.25958 2021 3 10 59283 0.0093 0.3763 -0.25994 2021 3 11 59284 0.0096 0.3782 -0.26049 2021 3 12 59285 0.0100 0.3801 -0.26122 2021 3 13 59286 0.0103 0.3820 -0.26218 2021 3 14 59287 0.0107 0.3838 -0.26323 2021 3 15 59288 0.0112 0.3857 -0.26426 2021 3 16 59289 0.0117 0.3876 -0.26525 2021 3 17 59290 0.0122 0.3894 -0.26623 2021 3 18 59291 0.0128 0.3913 -0.26710 2021 3 19 59292 0.0133 0.3931 -0.26785 2021 3 20 59293 0.0140 0.3949 -0.26852 2021 3 21 59294 0.0146 0.3968 -0.26911 2021 3 22 59295 0.0153 0.3986 -0.26963 2021 3 23 59296 0.0160 0.4004 -0.27012 2021 3 24 59297 0.0168 0.4022 -0.27066 2021 3 25 59298 0.0176 0.4039 -0.27132 2021 3 26 59299 0.0184 0.4057 -0.27221 2021 3 27 59300 0.0193 0.4075 -0.27337 2021 3 28 59301 0.0201 0.4092 -0.27480 2021 3 29 59302 0.0211 0.4109 -0.27641 2021 3 30 59303 0.0220 0.4126 -0.27804 2021 3 31 59304 0.0230 0.4143 -0.27956 2021 4 1 59305 0.0240 0.4160 -0.28086 2021 4 2 59306 0.0251 0.4177 -0.28181 2021 4 3 59307 0.0261 0.4193 -0.28249 2021 4 4 59308 0.0272 0.4210 -0.28304 2021 4 5 59309 0.0284 0.4226 -0.28353 2021 4 6 59310 0.0296 0.4242 -0.28399 2021 4 7 59311 0.0308 0.4258 -0.28462 2021 4 8 59312 0.0320 0.4273 -0.28546 2021 4 9 59313 0.0332 0.4289 -0.28641 2021 4 10 59314 0.0345 0.4304 -0.28743 2021 4 11 59315 0.0358 0.4319 -0.28846 2021 4 12 59316 0.0372 0.4334 -0.28947 2021 4 13 59317 0.0385 0.4348 -0.29034 2021 4 14 59318 0.0399 0.4363 -0.29111 2021 4 15 59319 0.0414 0.4377 -0.29177 2021 4 16 59320 0.0428 0.4391 -0.29232 2021 4 17 59321 0.0443 0.4405 -0.29275 2021 4 18 59322 0.0458 0.4418 -0.29311 2021 4 19 59323 0.0473 0.4432 -0.29339 2021 4 20 59324 0.0489 0.4445 -0.29367 2021 4 21 59325 0.0505 0.4457 -0.29406 2021 4 22 59326 0.0521 0.4470 -0.29469 2021 4 23 59327 0.0537 0.4482 -0.29553 2021 4 24 59328 0.0553 0.4494 -0.29661 2021 4 25 59329 0.0570 0.4506 -0.29796 2021 4 26 59330 0.0587 0.4518 -0.29949 2021 4 27 59331 0.0604 0.4529 -0.30104 2021 4 28 59332 0.0621 0.4540 -0.30240 2021 4 29 59333 0.0639 0.4551 -0.30348 2021 4 30 59334 0.0657 0.4561 -0.30427 2021 5 1 59335 0.0675 0.4571 -0.30482 2021 5 2 59336 0.0693 0.4581 -0.30530 2021 5 3 59337 0.0711 0.4591 -0.30581 2021 5 4 59338 0.0730 0.4600 -0.30645 2021 5 5 59339 0.0748 0.4609 -0.30727 2021 5 6 59340 0.0767 0.4618 -0.30820 2021 5 7 59341 0.0786 0.4626 -0.30927 2021 5 8 59342 0.0806 0.4634 -0.31039 2021 5 9 59343 0.0825 0.4642 -0.31148 2021 5 10 59344 0.0844 0.4650 -0.31248 2021 5 11 59345 0.0864 0.4657 -0.31335 2021 5 12 59346 0.0884 0.4664 -0.31402 2021 5 13 59347 0.0904 0.4671 -0.31450 2021 5 14 59348 0.0924 0.4677 -0.31485 2021 5 15 59349 0.0944 0.4683 -0.31506 2021 5 16 59350 0.0964 0.4688 -0.31517 2021 5 17 59351 0.0985 0.4694 -0.31526 2021 5 18 59352 0.1005 0.4699 -0.31540 2021 5 19 59353 0.1026 0.4704 -0.31566 2021 5 20 59354 0.1046 0.4708 -0.31611 2021 5 21 59355 0.1067 0.4712 -0.31683 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) 58968 -105.58 0.26 -10.69 0.06 58969 -105.35 0.26 -10.69 0.06 58970 -104.96 0.26 -10.67 0.06 58971 -104.59 0.25 -10.70 0.06 58972 -104.33 0.27 -10.71 0.09 58973 -104.27 0.28 -10.58 0.10 58974 -104.54 0.28 -10.38 0.10 IAU2000A Celestial Pole Offset Series MJD dX error dY error (msec. of arc) 58968 0.102 0.103 -0.079 0.057 58969 0.117 0.103 -0.086 0.057 58970 0.133 0.103 -0.093 0.057 58971 0.149 0.099 -0.101 0.060 58972 0.166 0.107 -0.108 0.087 58973 0.182 0.111 -0.116 0.102 58974 0.198 0.111 -0.123 0.102 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).