********************************************************************** * * * I E R S B U L L E T I N - A * * * * Rapid Service/Prediction of Earth Orientation * ********************************************************************** 3 December 2020 Vol. XXXIII No. 049 ______________________________________________________________________ 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 11 27 59180 0.11876 .00009 0.28790 .00009 -0.179173 0.000016 20 11 28 59181 0.11618 .00009 0.28826 .00009 -0.179300 0.000014 20 11 29 59182 0.11341 .00009 0.28848 .00009 -0.179304 0.000013 20 11 30 59183 0.11073 .00009 0.28850 .00009 -0.179208 0.000012 20 12 1 59184 0.10832 .00009 0.28814 .00009 -0.179007 0.000016 20 12 2 59185 0.10629 .00009 0.28767 .00009 -0.178708 0.000019 20 12 3 59186 0.10456 .00009 0.28754 .00009 -0.178308 0.000018 IERS Final Values MJD x y UT1-UTC " " s 20 10 2 59124 0.1927 0.3237 -0.17324 20 10 3 59125 0.1913 0.3229 -0.17310 20 10 4 59126 0.1904 0.3216 -0.17297 20 10 5 59127 0.1901 0.3201 -0.17279 20 10 6 59128 0.1896 0.3192 -0.17252 20 10 7 59129 0.1885 0.3185 -0.17209 20 10 8 59130 0.1872 0.3176 -0.17155 20 10 9 59131 0.1859 0.3163 -0.17094 20 10 10 59132 0.1846 0.3149 -0.17035 20 10 11 59133 0.1831 0.3138 -0.16983 20 10 12 59134 0.1814 0.3125 -0.16942 20 10 13 59135 0.1802 0.3113 -0.16929 20 10 14 59136 0.1790 0.3105 -0.16948 20 10 15 59137 0.1783 0.3096 -0.16995 20 10 16 59138 0.1779 0.3089 -0.17064 20 10 17 59139 0.1777 0.3082 -0.17145 20 10 18 59140 0.1779 0.3074 -0.17221 20 10 19 59141 0.1772 0.3066 -0.17274 20 10 20 59142 0.1758 0.3056 -0.17301 20 10 21 59143 0.1744 0.3047 -0.17311 20 10 22 59144 0.1732 0.3040 -0.17311 20 10 23 59145 0.1722 0.3031 -0.17311 20 10 24 59146 0.1710 0.3024 -0.17319 20 10 25 59147 0.1696 0.3015 -0.17332 20 10 26 59148 0.1682 0.3006 -0.17351 20 10 27 59149 0.1671 0.2998 -0.17377 20 10 28 59150 0.1653 0.2993 -0.17410 20 10 29 59151 0.1637 0.2984 -0.17446 20 10 30 59152 0.1622 0.2983 -0.17474 20 10 31 59153 0.1605 0.2977 -0.17507 20 11 1 59154 0.1585 0.2971 -0.17532 _______________________________________________________________________ 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 = 0.1188 - 0.0224 cos A - 0.0972 sin A + 0.0123 cos C + 0.0155 sin C y = 0.3605 - 0.0891 cos A + 0.0201 sin A + 0.0155 cos C - 0.0123 sin C UT1-UTC = -0.1707 + 0.00003 (MJD - 59194) - (UT2-UT1) where A = 2*pi*(MJD-59186)/365.25 and C = 2*pi*(MJD-59186)/435. TAI-UTC(MJD 59187) = 37.0 The accuracy may be estimated from the expressions: S x,y = 0.00068 (MJD-59186)**0.80 S t = 0.00025 (MJD-59186)**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 12 4 59187 0.1030 0.2876 -0.17787 2020 12 5 59188 0.1016 0.2880 -0.17752 2020 12 6 59189 0.1002 0.2884 -0.17732 2020 12 7 59190 0.0987 0.2890 -0.17732 2020 12 8 59191 0.0972 0.2895 -0.17756 2020 12 9 59192 0.0956 0.2899 -0.17801 2020 12 10 59193 0.0940 0.2903 -0.17858 2020 12 11 59194 0.0924 0.2907 -0.17917 2020 12 12 59195 0.0909 0.2912 -0.17967 2020 12 13 59196 0.0893 0.2916 -0.17997 2020 12 14 59197 0.0877 0.2921 -0.18003 2020 12 15 59198 0.0862 0.2926 -0.17985 2020 12 16 59199 0.0847 0.2930 -0.17953 2020 12 17 59200 0.0834 0.2935 -0.17917 2020 12 18 59201 0.0821 0.2940 -0.17884 2020 12 19 59202 0.0809 0.2946 -0.17862 2020 12 20 59203 0.0798 0.2952 -0.17852 2020 12 21 59204 0.0786 0.2960 -0.17852 2020 12 22 59205 0.0774 0.2968 -0.17856 2020 12 23 59206 0.0762 0.2976 -0.17862 2020 12 24 59207 0.0749 0.2984 -0.17866 2020 12 25 59208 0.0736 0.2991 -0.17864 2020 12 26 59209 0.0724 0.2999 -0.17851 2020 12 27 59210 0.0711 0.3006 -0.17825 2020 12 28 59211 0.0699 0.3014 -0.17787 2020 12 29 59212 0.0688 0.3022 -0.17735 2020 12 30 59213 0.0676 0.3031 -0.17676 2020 12 31 59214 0.0665 0.3039 -0.17616 2021 1 1 59215 0.0654 0.3048 -0.17561 2021 1 2 59216 0.0643 0.3058 -0.17520 2021 1 3 59217 0.0632 0.3067 -0.17499 2021 1 4 59218 0.0621 0.3077 -0.17501 2021 1 5 59219 0.0610 0.3087 -0.17525 2021 1 6 59220 0.0599 0.3097 -0.17564 2021 1 7 59221 0.0589 0.3107 -0.17608 2021 1 8 59222 0.0578 0.3117 -0.17645 2021 1 9 59223 0.0568 0.3128 -0.17665 2021 1 10 59224 0.0557 0.3139 -0.17661 2021 1 11 59225 0.0547 0.3149 -0.17634 2021 1 12 59226 0.0537 0.3160 -0.17590 2021 1 13 59227 0.0528 0.3171 -0.17538 2021 1 14 59228 0.0519 0.3182 -0.17488 2021 1 15 59229 0.0510 0.3194 -0.17448 2021 1 16 59230 0.0501 0.3205 -0.17420 2021 1 17 59231 0.0492 0.3217 -0.17404 2021 1 18 59232 0.0483 0.3229 -0.17397 2021 1 19 59233 0.0475 0.3241 -0.17396 2021 1 20 59234 0.0467 0.3254 -0.17394 2021 1 21 59235 0.0459 0.3266 -0.17388 2021 1 22 59236 0.0451 0.3278 -0.17372 2021 1 23 59237 0.0444 0.3291 -0.17344 2021 1 24 59238 0.0436 0.3304 -0.17304 2021 1 25 59239 0.0429 0.3317 -0.17252 2021 1 26 59240 0.0423 0.3330 -0.17191 2021 1 27 59241 0.0416 0.3343 -0.17128 2021 1 28 59242 0.0410 0.3356 -0.17068 2021 1 29 59243 0.0404 0.3370 -0.17021 2021 1 30 59244 0.0398 0.3383 -0.16993 2021 1 31 59245 0.0393 0.3397 -0.16989 2021 2 1 59246 0.0388 0.3411 -0.17008 2021 2 2 59247 0.0383 0.3425 -0.17042 2021 2 3 59248 0.0378 0.3439 -0.17082 2021 2 4 59249 0.0374 0.3453 -0.17117 2021 2 5 59250 0.0369 0.3467 -0.17137 2021 2 6 59251 0.0366 0.3481 -0.17137 2021 2 7 59252 0.0362 0.3496 -0.17116 2021 2 8 59253 0.0359 0.3510 -0.17079 2021 2 9 59254 0.0355 0.3525 -0.17034 2021 2 10 59255 0.0353 0.3539 -0.16992 2021 2 11 59256 0.0350 0.3554 -0.16962 2021 2 12 59257 0.0348 0.3569 -0.16948 2021 2 13 59258 0.0346 0.3583 -0.16951 2021 2 14 59259 0.0344 0.3598 -0.16968 2021 2 15 59260 0.0343 0.3613 -0.16994 2021 2 16 59261 0.0341 0.3628 -0.17022 2021 2 17 59262 0.0340 0.3643 -0.17048 2021 2 18 59263 0.0340 0.3658 -0.17065 2021 2 19 59264 0.0340 0.3673 -0.17071 2021 2 20 59265 0.0339 0.3688 -0.17064 2021 2 21 59266 0.0340 0.3703 -0.17044 2021 2 22 59267 0.0340 0.3718 -0.17015 2021 2 23 59268 0.0341 0.3733 -0.16981 2021 2 24 59269 0.0342 0.3748 -0.16950 2021 2 25 59270 0.0343 0.3764 -0.16929 2021 2 26 59271 0.0345 0.3779 -0.16927 2021 2 27 59272 0.0347 0.3794 -0.16951 2021 2 28 59273 0.0349 0.3809 -0.17003 2021 3 1 59274 0.0352 0.3824 -0.17075 2021 3 2 59275 0.0354 0.3839 -0.17159 2021 3 3 59276 0.0358 0.3854 -0.17239 2021 3 4 59277 0.0361 0.3869 -0.17305 2021 3 5 59278 0.0365 0.3884 -0.17348 2021 3 6 59279 0.0368 0.3899 -0.17367 2021 3 7 59280 0.0373 0.3914 -0.17367 2021 3 8 59281 0.0377 0.3929 -0.17357 2021 3 9 59282 0.0382 0.3944 -0.17346 2021 3 10 59283 0.0387 0.3958 -0.17343 2021 3 11 59284 0.0392 0.3973 -0.17353 2021 3 12 59285 0.0398 0.3988 -0.17380 2021 3 13 59286 0.0404 0.4002 -0.17421 2021 3 14 59287 0.0410 0.4017 -0.17472 2021 3 15 59288 0.0416 0.4031 -0.17529 2021 3 16 59289 0.0423 0.4045 -0.17584 2021 3 17 59290 0.0430 0.4060 -0.17633 2021 3 18 59291 0.0437 0.4074 -0.17671 2021 3 19 59292 0.0445 0.4088 -0.17696 2021 3 20 59293 0.0453 0.4102 -0.17708 2021 3 21 59294 0.0461 0.4116 -0.17709 2021 3 22 59295 0.0469 0.4130 -0.17699 2021 3 23 59296 0.0478 0.4143 -0.17688 2021 3 24 59297 0.0486 0.4157 -0.17685 2021 3 25 59298 0.0496 0.4170 -0.17697 2021 3 26 59299 0.0505 0.4183 -0.17733 2021 3 27 59300 0.0515 0.4197 -0.17797 2021 3 28 59301 0.0524 0.4210 -0.17888 2021 3 29 59302 0.0535 0.4222 -0.17997 2021 3 30 59303 0.0545 0.4235 -0.18109 2021 3 31 59304 0.0556 0.4248 -0.18209 2021 4 1 59305 0.0566 0.4260 -0.18286 2021 4 2 59306 0.0578 0.4272 -0.18335 2021 4 3 59307 0.0589 0.4285 -0.18361 2021 4 4 59308 0.0600 0.4297 -0.18370 2021 4 5 59309 0.0612 0.4308 -0.18375 2021 4 6 59310 0.0624 0.4320 -0.18383 2021 4 7 59311 0.0637 0.4332 -0.18403 2021 4 8 59312 0.0649 0.4343 -0.18436 2021 4 9 59313 0.0662 0.4354 -0.18483 2021 4 10 59314 0.0675 0.4365 -0.18541 2021 4 11 59315 0.0688 0.4376 -0.18603 2021 4 12 59316 0.0701 0.4386 -0.18665 2021 4 13 59317 0.0715 0.4397 -0.18720 2021 4 14 59318 0.0728 0.4407 -0.18763 2021 4 15 59319 0.0742 0.4417 -0.18792 2021 4 16 59320 0.0757 0.4426 -0.18805 2021 4 17 59321 0.0771 0.4436 -0.18804 2021 4 18 59322 0.0785 0.4445 -0.18792 2021 4 19 59323 0.0800 0.4454 -0.18776 2021 4 20 59324 0.0815 0.4463 -0.18762 2021 4 21 59325 0.0830 0.4472 -0.18758 2021 4 22 59326 0.0845 0.4481 -0.18773 2021 4 23 59327 0.0861 0.4489 -0.18812 2021 4 24 59328 0.0876 0.4497 -0.18879 2021 4 25 59329 0.0892 0.4505 -0.18968 2021 4 26 59330 0.0908 0.4512 -0.19068 2021 4 27 59331 0.0924 0.4519 -0.19163 2021 4 28 59332 0.0940 0.4527 -0.19239 2021 4 29 59333 0.0957 0.4533 -0.19286 2021 4 30 59334 0.0973 0.4540 -0.19305 2021 5 1 59335 0.0990 0.4546 -0.19301 2021 5 2 59336 0.1007 0.4552 -0.19287 2021 5 3 59337 0.1023 0.4558 -0.19273 2021 5 4 59338 0.1040 0.4564 -0.19267 2021 5 5 59339 0.1057 0.4569 -0.19273 2021 5 6 59340 0.1075 0.4574 -0.19291 2021 5 7 59341 0.1092 0.4579 -0.19319 2021 5 8 59342 0.1109 0.4584 -0.19351 2021 5 9 59343 0.1127 0.4588 -0.19382 2021 5 10 59344 0.1145 0.4592 -0.19407 2021 5 11 59345 0.1162 0.4596 -0.19420 2021 5 12 59346 0.1180 0.4599 -0.19418 2021 5 13 59347 0.1198 0.4602 -0.19400 2021 5 14 59348 0.1216 0.4605 -0.19364 2021 5 15 59349 0.1234 0.4608 -0.19316 2021 5 16 59350 0.1252 0.4611 -0.19260 2021 5 17 59351 0.1270 0.4613 -0.19203 2021 5 18 59352 0.1288 0.4615 -0.19152 2021 5 19 59353 0.1307 0.4616 -0.19115 2021 5 20 59354 0.1325 0.4617 -0.19097 2021 5 21 59355 0.1343 0.4618 -0.19104 2021 5 22 59356 0.1361 0.4619 -0.19133 2021 5 23 59357 0.1380 0.4620 -0.19178 2021 5 24 59358 0.1398 0.4620 -0.19226 2021 5 25 59359 0.1417 0.4620 -0.19262 2021 5 26 59360 0.1435 0.4619 -0.19273 2021 5 27 59361 0.1454 0.4619 -0.19254 2021 5 28 59362 0.1472 0.4618 -0.19209 2021 5 29 59363 0.1490 0.4617 -0.19148 2021 5 30 59364 0.1509 0.4615 -0.19081 2021 5 31 59365 0.1527 0.4613 -0.19018 2021 6 1 59366 0.1546 0.4611 -0.18966 2021 6 2 59367 0.1564 0.4609 -0.18925 2021 6 3 59368 0.1582 0.4606 -0.18891 2021 6 4 59369 0.1601 0.4603 -0.18859 2021 6 5 59370 0.1619 0.4600 -0.18824 2021 6 6 59371 0.1637 0.4597 -0.18779 2021 6 7 59372 0.1655 0.4593 -0.18720 2021 6 8 59373 0.1673 0.4589 -0.18642 2021 6 9 59374 0.1691 0.4585 -0.18544 2021 6 10 59375 0.1709 0.4580 -0.18427 2021 6 11 59376 0.1727 0.4575 -0.18294 2021 6 12 59377 0.1745 0.4570 -0.18151 2021 6 13 59378 0.1763 0.4565 -0.18005 2021 6 14 59379 0.1780 0.4559 -0.17867 2021 6 15 59380 0.1798 0.4553 -0.17742 2021 6 16 59381 0.1815 0.4547 -0.17639 2021 6 17 59382 0.1833 0.4540 -0.17562 2021 6 18 59383 0.1850 0.4533 -0.17511 2021 6 19 59384 0.1867 0.4526 -0.17483 2021 6 20 59385 0.1884 0.4519 -0.17468 2021 6 21 59386 0.1901 0.4511 -0.17455 2021 6 22 59387 0.1918 0.4503 -0.17430 2021 6 23 59388 0.1934 0.4495 -0.17385 2021 6 24 59389 0.1951 0.4487 -0.17320 2021 6 25 59390 0.1967 0.4478 -0.17242 2021 6 26 59391 0.1983 0.4469 -0.17160 2021 6 27 59392 0.1999 0.4460 -0.17087 2021 6 28 59393 0.2015 0.4451 -0.17028 2021 6 29 59394 0.2031 0.4441 -0.16986 2021 6 30 59395 0.2047 0.4431 -0.16959 2021 7 1 59396 0.2062 0.4421 -0.16940 2021 7 2 59397 0.2077 0.4411 -0.16925 2021 7 3 59398 0.2092 0.4400 -0.16906 2021 7 4 59399 0.2107 0.4389 -0.16879 2021 7 5 59400 0.2122 0.4378 -0.16839 2021 7 6 59401 0.2136 0.4367 -0.16784 2021 7 7 59402 0.2150 0.4355 -0.16711 2021 7 8 59403 0.2165 0.4343 -0.16621 2021 7 9 59404 0.2178 0.4331 -0.16518 2021 7 10 59405 0.2192 0.4319 -0.16412 2021 7 11 59406 0.2206 0.4307 -0.16313 2021 7 12 59407 0.2219 0.4294 -0.16228 2021 7 13 59408 0.2232 0.4281 -0.16160 2021 7 14 59409 0.2244 0.4268 -0.16113 2021 7 15 59410 0.2257 0.4255 -0.16087 2021 7 16 59411 0.2269 0.4241 -0.16069 2021 7 17 59412 0.2281 0.4227 -0.16058 2021 7 18 59413 0.2293 0.4214 -0.16044 2021 7 19 59414 0.2305 0.4200 -0.16010 2021 7 20 59415 0.2316 0.4185 -0.15955 2021 7 21 59416 0.2327 0.4171 -0.15882 2021 7 22 59417 0.2338 0.4156 -0.15789 2021 7 23 59418 0.2349 0.4141 -0.15685 2021 7 24 59419 0.2359 0.4126 -0.15580 2021 7 25 59420 0.2369 0.4111 -0.15486 2021 7 26 59421 0.2379 0.4096 -0.15409 2021 7 27 59422 0.2388 0.4081 -0.15346 2021 7 28 59423 0.2397 0.4065 -0.15287 2021 7 29 59424 0.2406 0.4049 -0.15228 2021 7 30 59425 0.2415 0.4033 -0.15166 2021 7 31 59426 0.2423 0.4017 -0.15095 2021 8 1 59427 0.2432 0.4001 -0.15011 2021 8 2 59428 0.2439 0.3985 -0.14910 2021 8 3 59429 0.2447 0.3968 -0.14795 2021 8 4 59430 0.2454 0.3952 -0.14674 2021 8 5 59431 0.2461 0.3935 -0.14547 2021 8 6 59432 0.2468 0.3918 -0.14415 2021 8 7 59433 0.2474 0.3901 -0.14285 2021 8 8 59434 0.2480 0.3884 -0.14168 2021 8 9 59435 0.2486 0.3867 -0.14079 2021 8 10 59436 0.2491 0.3850 -0.14024 2021 8 11 59437 0.2496 0.3833 -0.14002 2021 8 12 59438 0.2501 0.3815 -0.14002 2021 8 13 59439 0.2505 0.3798 -0.14017 2021 8 14 59440 0.2510 0.3780 -0.14034 2021 8 15 59441 0.2513 0.3763 -0.14037 2021 8 16 59442 0.2517 0.3745 -0.14020 2021 8 17 59443 0.2520 0.3727 -0.13979 2021 8 18 59444 0.2523 0.3709 -0.13916 2021 8 19 59445 0.2526 0.3691 -0.13838 2021 8 20 59446 0.2528 0.3673 -0.13757 2021 8 21 59447 0.2530 0.3656 -0.13680 2021 8 22 59448 0.2531 0.3637 -0.13619 2021 8 23 59449 0.2533 0.3619 -0.13573 2021 8 24 59450 0.2534 0.3601 -0.13537 2021 8 25 59451 0.2534 0.3583 -0.13505 2021 8 26 59452 0.2535 0.3565 -0.13476 2021 8 27 59453 0.2535 0.3547 -0.13438 2021 8 28 59454 0.2534 0.3529 -0.13387 2021 8 29 59455 0.2533 0.3511 -0.13324 2021 8 30 59456 0.2532 0.3493 -0.13248 2021 8 31 59457 0.2531 0.3474 -0.13163 2021 9 1 59458 0.2529 0.3456 -0.13066 2021 9 2 59459 0.2527 0.3438 -0.12969 2021 9 3 59460 0.2525 0.3420 -0.12883 2021 9 4 59461 0.2523 0.3402 -0.12811 2021 9 5 59462 0.2520 0.3384 -0.12763 2021 9 6 59463 0.2516 0.3366 -0.12746 2021 9 7 59464 0.2513 0.3348 -0.12758 2021 9 8 59465 0.2509 0.3330 -0.12793 2021 9 9 59466 0.2504 0.3312 -0.12848 2021 9 10 59467 0.2500 0.3295 -0.12907 2021 9 11 59468 0.2495 0.3277 -0.12957 2021 9 12 59469 0.2490 0.3259 -0.12994 2021 9 13 59470 0.2484 0.3242 -0.13012 2021 9 14 59471 0.2478 0.3224 -0.13006 2021 9 15 59472 0.2472 0.3207 -0.12988 2021 9 16 59473 0.2465 0.3189 -0.12972 2021 9 17 59474 0.2459 0.3172 -0.12969 2021 9 18 59475 0.2452 0.3155 -0.12979 2021 9 19 59476 0.2444 0.3138 -0.13007 2021 9 20 59477 0.2436 0.3121 -0.13052 2021 9 21 59478 0.2428 0.3104 -0.13106 2021 9 22 59479 0.2420 0.3088 -0.13166 2021 9 23 59480 0.2411 0.3071 -0.13223 2021 9 24 59481 0.2402 0.3054 -0.13268 2021 9 25 59482 0.2393 0.3038 -0.13299 2021 9 26 59483 0.2383 0.3022 -0.13315 2021 9 27 59484 0.2373 0.3006 -0.13317 2021 9 28 59485 0.2363 0.2990 -0.13310 2021 9 29 59486 0.2353 0.2974 -0.13301 2021 9 30 59487 0.2342 0.2959 -0.13291 2021 10 1 59488 0.2331 0.2943 -0.13278 2021 10 2 59489 0.2320 0.2928 -0.13267 2021 10 3 59490 0.2308 0.2913 -0.13275 2021 10 4 59491 0.2296 0.2898 -0.13307 2021 10 5 59492 0.2284 0.2883 -0.13362 2021 10 6 59493 0.2272 0.2869 -0.13438 2021 10 7 59494 0.2259 0.2854 -0.13523 2021 10 8 59495 0.2246 0.2840 -0.13601 2021 10 9 59496 0.2233 0.2826 -0.13667 2021 10 10 59497 0.2220 0.2812 -0.13713 2021 10 11 59498 0.2206 0.2799 -0.13740 2021 10 12 59499 0.2192 0.2785 -0.13750 2021 10 13 59500 0.2178 0.2772 -0.13751 2021 10 14 59501 0.2163 0.2759 -0.13753 2021 10 15 59502 0.2149 0.2746 -0.13769 2021 10 16 59503 0.2134 0.2734 -0.13809 2021 10 17 59504 0.2119 0.2721 -0.13870 2021 10 18 59505 0.2103 0.2709 -0.13945 2021 10 19 59506 0.2088 0.2697 -0.14030 2021 10 20 59507 0.2072 0.2686 -0.14119 2021 10 21 59508 0.2056 0.2674 -0.14202 2021 10 22 59509 0.2040 0.2663 -0.14280 2021 10 23 59510 0.2023 0.2652 -0.14346 2021 10 24 59511 0.2007 0.2642 -0.14406 2021 10 25 59512 0.1990 0.2631 -0.14455 2021 10 26 59513 0.1973 0.2621 -0.14494 2021 10 27 59514 0.1956 0.2611 -0.14530 2021 10 28 59515 0.1938 0.2602 -0.14569 2021 10 29 59516 0.1921 0.2592 -0.14615 2021 10 30 59517 0.1903 0.2583 -0.14681 2021 10 31 59518 0.1885 0.2574 -0.14772 2021 11 1 59519 0.1867 0.2566 -0.14893 2021 11 2 59520 0.1849 0.2558 -0.15039 2021 11 3 59521 0.1830 0.2550 -0.15198 2021 11 4 59522 0.1812 0.2542 -0.15354 2021 11 5 59523 0.1793 0.2535 -0.15490 2021 11 6 59524 0.1774 0.2527 -0.15587 2021 11 7 59525 0.1755 0.2521 -0.15647 2021 11 8 59526 0.1736 0.2514 -0.15677 2021 11 9 59527 0.1717 0.2508 -0.15689 2021 11 10 59528 0.1698 0.2502 -0.15697 2021 11 11 59529 0.1679 0.2496 -0.15709 2021 11 12 59530 0.1659 0.2491 -0.15730 2021 11 13 59531 0.1639 0.2486 -0.15766 2021 11 14 59532 0.1620 0.2481 -0.15818 2021 11 15 59533 0.1600 0.2476 -0.15879 2021 11 16 59534 0.1580 0.2472 -0.15944 2021 11 17 59535 0.1560 0.2468 -0.16016 2021 11 18 59536 0.1540 0.2465 -0.16085 2021 11 19 59537 0.1520 0.2462 -0.16135 2021 11 20 59538 0.1500 0.2459 -0.16171 2021 11 21 59539 0.1479 0.2456 -0.16196 2021 11 22 59540 0.1459 0.2454 -0.16208 2021 11 23 59541 0.1439 0.2452 -0.16213 2021 11 24 59542 0.1418 0.2450 -0.16215 2021 11 25 59543 0.1398 0.2449 -0.16223 2021 11 26 59544 0.1378 0.2448 -0.16243 2021 11 27 59545 0.1357 0.2447 -0.16281 2021 11 28 59546 0.1337 0.2447 -0.16337 2021 11 29 59547 0.1316 0.2447 -0.16415 2021 11 30 59548 0.1296 0.2447 -0.16508 2021 12 1 59549 0.1275 0.2447 -0.16606 2021 12 2 59550 0.1255 0.2448 -0.16693 2021 12 3 59551 0.1234 0.2449 -0.16755 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) 59160 -113.11 0.31 -7.94 0.10 59161 -112.69 0.59 -7.73 0.07 59162 -112.26 0.59 -7.44 0.07 59163 -112.03 0.71 -7.22 0.01 59164 -112.01 0.71 -7.04 0.01 59165 -112.20 0.71 -6.85 0.01 59166 -112.56 0.71 -6.74 0.01 59167 -112.92 0.32 -6.87 0.16 59168 -113.00 0.18 -7.13 0.08 59169 -112.76 0.18 -7.21 0.08 59170 -112.48 0.18 -7.02 0.08 IERS Celestial Pole Offset Final Series MJD dpsi deps (msec. of arc) 59124 -116.5 -8.8 59125 -116.4 -8.7 59126 -116.3 -8.8 59127 -116.1 -8.9 59128 -116.0 -9.0 59129 -116.1 -9.1 59130 -116.4 -9.3 59131 -116.6 -9.5 59132 -116.5 -9.4 59133 -115.9 -9.2 59134 -115.4 -8.9 59135 -115.1 -8.7 59136 -115.1 -8.4 59137 -115.1 -8.1 59138 -115.4 -8.0 59139 -115.6 -8.2 59140 -115.6 -8.5 59141 -115.4 -8.6 59142 -115.3 -8.5 59143 -115.1 -8.3 59144 -115.1 -8.4 59145 -115.1 -8.6 59146 -115.2 -8.6 59147 -115.1 -8.5 59148 -115.0 -8.3 59149 -114.7 -8.2 59150 -114.5 -8.1 59151 -114.4 -7.9 59152 -114.3 -7.6 59153 -114.2 -7.5 59154 -114.0 -7.5 IAU2000A Celestial Pole Offset Series MJD dX error dY error (msec. of arc) 59160 0.196 0.125 0.049 0.102 59161 0.205 0.234 0.043 0.066 59162 0.213 0.234 0.036 0.066 59163 0.215 0.284 0.028 0.005 59164 0.209 0.284 0.021 0.005 59165 0.194 0.284 0.015 0.005 59166 0.171 0.284 0.009 0.005 59167 0.143 0.128 0.004 0.160 59168 0.109 0.071 -0.001 0.081 59169 0.072 0.071 -0.006 0.081 59170 0.034 0.071 -0.010 0.081 IAU2000A Celestial Pole Offset Final Series MJD dX dY (msec. of arc) 59124 0.15 -0.06 59125 0.14 -0.06 59126 0.12 -0.04 59127 0.10 -0.02 59128 0.07 0.00 59129 0.07 0.00 59130 0.08 -0.00 59131 0.08 -0.01 59132 0.08 -0.02 59133 0.08 -0.04 59134 0.08 -0.05 59135 0.07 -0.07 59136 0.07 -0.08 59137 0.07 -0.04 59138 0.07 0.02 59139 0.04 0.03 59140 0.01 0.02 59141 -0.02 0.01 59142 -0.05 -0.00 59143 0.00 0.00 59144 0.00 0.00 59145 0.00 0.00 59146 0.00 0.00 59147 0.00 0.00 59148 0.00 0.00 59149 0.00 0.00 59150 0.00 0.00 59151 0.00 0.00 59152 0.00 0.00 59153 0.00 0.00 59154 0.00 0.00 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).