********************************************************************** * * * I E R S B U L L E T I N - A * * * * Rapid Service/Prediction of Earth Orientation * ********************************************************************** 10 December 2020 Vol. XXXIII No. 050 ______________________________________________________________________ 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 12 4 59187 0.10298 .00009 0.28796 .00009 -0.177915 0.000012 20 12 5 59188 0.10130 .00009 0.28883 .00009 -0.177627 0.000012 20 12 6 59189 0.09942 .00009 0.28950 .00009 -0.177542 0.000015 20 12 7 59190 0.09741 .00009 0.28968 .00009 -0.177655 0.000017 20 12 8 59191 0.09537 .00009 0.28971 .00009 -0.177978 0.000019 20 12 9 59192 0.09338 .00009 0.28965 .00009 -0.178472 0.000022 20 12 10 59193 0.09157 .00009 0.28941 .00009 -0.179039 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 = 0.1178 - 0.0342 cos A - 0.0972 sin A + 0.0122 cos C + 0.0170 sin C y = 0.3616 - 0.0889 cos A + 0.0306 sin A + 0.0170 cos C - 0.0122 sin C UT1-UTC = -0.1709 + 0.00004 (MJD - 59201) - (UT2-UT1) where A = 2*pi*(MJD-59193)/365.25 and C = 2*pi*(MJD-59193)/435. TAI-UTC(MJD 59194) = 37.0 The accuracy may be estimated from the expressions: S x,y = 0.00068 (MJD-59193)**0.80 S t = 0.00025 (MJD-59193)**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 11 59194 0.0900 0.2893 -0.17967 2020 12 12 59195 0.0886 0.2894 -0.18020 2020 12 13 59196 0.0872 0.2897 -0.18050 2020 12 14 59197 0.0858 0.2901 -0.18054 2020 12 15 59198 0.0843 0.2906 -0.18035 2020 12 16 59199 0.0828 0.2911 -0.17999 2020 12 17 59200 0.0813 0.2917 -0.17958 2020 12 18 59201 0.0798 0.2922 -0.17921 2020 12 19 59202 0.0784 0.2927 -0.17895 2020 12 20 59203 0.0770 0.2933 -0.17882 2020 12 21 59204 0.0757 0.2939 -0.17881 2020 12 22 59205 0.0743 0.2946 -0.17888 2020 12 23 59206 0.0730 0.2953 -0.17898 2020 12 24 59207 0.0717 0.2960 -0.17909 2020 12 25 59208 0.0704 0.2967 -0.17915 2020 12 26 59209 0.0690 0.2975 -0.17910 2020 12 27 59210 0.0678 0.2983 -0.17893 2020 12 28 59211 0.0665 0.2991 -0.17860 2020 12 29 59212 0.0653 0.2999 -0.17814 2020 12 30 59213 0.0640 0.3007 -0.17759 2020 12 31 59214 0.0628 0.3016 -0.17702 2021 1 1 59215 0.0616 0.3025 -0.17649 2021 1 2 59216 0.0605 0.3034 -0.17608 2021 1 3 59217 0.0593 0.3044 -0.17587 2021 1 4 59218 0.0582 0.3053 -0.17587 2021 1 5 59219 0.0571 0.3063 -0.17608 2021 1 6 59220 0.0560 0.3073 -0.17643 2021 1 7 59221 0.0549 0.3083 -0.17684 2021 1 8 59222 0.0538 0.3094 -0.17719 2021 1 9 59223 0.0528 0.3105 -0.17737 2021 1 10 59224 0.0517 0.3115 -0.17734 2021 1 11 59225 0.0507 0.3126 -0.17709 2021 1 12 59226 0.0497 0.3138 -0.17668 2021 1 13 59227 0.0488 0.3149 -0.17621 2021 1 14 59228 0.0478 0.3160 -0.17578 2021 1 15 59229 0.0469 0.3172 -0.17546 2021 1 16 59230 0.0460 0.3184 -0.17530 2021 1 17 59231 0.0451 0.3196 -0.17527 2021 1 18 59232 0.0443 0.3208 -0.17533 2021 1 19 59233 0.0434 0.3220 -0.17544 2021 1 20 59234 0.0426 0.3233 -0.17553 2021 1 21 59235 0.0418 0.3246 -0.17556 2021 1 22 59236 0.0411 0.3258 -0.17547 2021 1 23 59237 0.0403 0.3271 -0.17526 2021 1 24 59238 0.0396 0.3284 -0.17490 2021 1 25 59239 0.0389 0.3298 -0.17442 2021 1 26 59240 0.0382 0.3311 -0.17383 2021 1 27 59241 0.0376 0.3324 -0.17321 2021 1 28 59242 0.0369 0.3338 -0.17262 2021 1 29 59243 0.0363 0.3352 -0.17216 2021 1 30 59244 0.0358 0.3365 -0.17191 2021 1 31 59245 0.0352 0.3379 -0.17191 2021 2 1 59246 0.0347 0.3393 -0.17213 2021 2 2 59247 0.0342 0.3408 -0.17252 2021 2 3 59248 0.0337 0.3422 -0.17297 2021 2 4 59249 0.0333 0.3436 -0.17338 2021 2 5 59250 0.0329 0.3451 -0.17362 2021 2 6 59251 0.0325 0.3465 -0.17366 2021 2 7 59252 0.0321 0.3480 -0.17349 2021 2 8 59253 0.0318 0.3494 -0.17314 2021 2 9 59254 0.0314 0.3509 -0.17271 2021 2 10 59255 0.0312 0.3524 -0.17228 2021 2 11 59256 0.0309 0.3539 -0.17195 2021 2 12 59257 0.0307 0.3554 -0.17176 2021 2 13 59258 0.0305 0.3569 -0.17172 2021 2 14 59259 0.0303 0.3584 -0.17181 2021 2 15 59260 0.0301 0.3599 -0.17199 2021 2 16 59261 0.0300 0.3614 -0.17219 2021 2 17 59262 0.0299 0.3629 -0.17235 2021 2 18 59263 0.0299 0.3645 -0.17244 2021 2 19 59264 0.0298 0.3660 -0.17242 2021 2 20 59265 0.0298 0.3675 -0.17227 2021 2 21 59266 0.0299 0.3691 -0.17201 2021 2 22 59267 0.0299 0.3706 -0.17167 2021 2 23 59268 0.0300 0.3721 -0.17130 2021 2 24 59269 0.0301 0.3737 -0.17097 2021 2 25 59270 0.0302 0.3752 -0.17075 2021 2 26 59271 0.0304 0.3767 -0.17074 2021 2 27 59272 0.0306 0.3783 -0.17100 2021 2 28 59273 0.0308 0.3798 -0.17152 2021 3 1 59274 0.0311 0.3813 -0.17226 2021 3 2 59275 0.0313 0.3829 -0.17311 2021 3 3 59276 0.0317 0.3844 -0.17392 2021 3 4 59277 0.0320 0.3859 -0.17458 2021 3 5 59278 0.0324 0.3875 -0.17501 2021 3 6 59279 0.0327 0.3890 -0.17521 2021 3 7 59280 0.0332 0.3905 -0.17520 2021 3 8 59281 0.0336 0.3920 -0.17509 2021 3 9 59282 0.0341 0.3935 -0.17496 2021 3 10 59283 0.0346 0.3950 -0.17491 2021 3 11 59284 0.0351 0.3965 -0.17499 2021 3 12 59285 0.0357 0.3980 -0.17523 2021 3 13 59286 0.0363 0.3995 -0.17562 2021 3 14 59287 0.0369 0.4010 -0.17611 2021 3 15 59288 0.0376 0.4025 -0.17664 2021 3 16 59289 0.0382 0.4039 -0.17716 2021 3 17 59290 0.0390 0.4054 -0.17760 2021 3 18 59291 0.0397 0.4068 -0.17793 2021 3 19 59292 0.0404 0.4083 -0.17812 2021 3 20 59293 0.0412 0.4097 -0.17818 2021 3 21 59294 0.0420 0.4111 -0.17812 2021 3 22 59295 0.0429 0.4125 -0.17799 2021 3 23 59296 0.0437 0.4139 -0.17786 2021 3 24 59297 0.0446 0.4153 -0.17779 2021 3 25 59298 0.0456 0.4167 -0.17789 2021 3 26 59299 0.0465 0.4180 -0.17823 2021 3 27 59300 0.0475 0.4194 -0.17886 2021 3 28 59301 0.0485 0.4207 -0.17976 2021 3 29 59302 0.0495 0.4220 -0.18081 2021 3 30 59303 0.0505 0.4233 -0.18190 2021 3 31 59304 0.0516 0.4246 -0.18287 2021 4 1 59305 0.0527 0.4259 -0.18360 2021 4 2 59306 0.0538 0.4272 -0.18407 2021 4 3 59307 0.0550 0.4284 -0.18429 2021 4 4 59308 0.0561 0.4297 -0.18435 2021 4 5 59309 0.0573 0.4309 -0.18436 2021 4 6 59310 0.0585 0.4321 -0.18441 2021 4 7 59311 0.0598 0.4332 -0.18458 2021 4 8 59312 0.0610 0.4344 -0.18488 2021 4 9 59313 0.0623 0.4356 -0.18532 2021 4 10 59314 0.0636 0.4367 -0.18586 2021 4 11 59315 0.0650 0.4378 -0.18645 2021 4 12 59316 0.0663 0.4389 -0.18704 2021 4 13 59317 0.0677 0.4399 -0.18756 2021 4 14 59318 0.0691 0.4410 -0.18796 2021 4 15 59319 0.0705 0.4420 -0.18822 2021 4 16 59320 0.0719 0.4430 -0.18832 2021 4 17 59321 0.0733 0.4440 -0.18828 2021 4 18 59322 0.0748 0.4450 -0.18813 2021 4 19 59323 0.0763 0.4459 -0.18795 2021 4 20 59324 0.0778 0.4469 -0.18778 2021 4 21 59325 0.0793 0.4478 -0.18772 2021 4 22 59326 0.0809 0.4486 -0.18785 2021 4 23 59327 0.0824 0.4495 -0.18823 2021 4 24 59328 0.0840 0.4503 -0.18888 2021 4 25 59329 0.0856 0.4512 -0.18975 2021 4 26 59330 0.0872 0.4519 -0.19073 2021 4 27 59331 0.0888 0.4527 -0.19167 2021 4 28 59332 0.0904 0.4534 -0.19242 2021 4 29 59333 0.0921 0.4542 -0.19289 2021 4 30 59334 0.0938 0.4549 -0.19306 2021 5 1 59335 0.0954 0.4555 -0.19302 2021 5 2 59336 0.0971 0.4562 -0.19287 2021 5 3 59337 0.0988 0.4568 -0.19272 2021 5 4 59338 0.1006 0.4574 -0.19265 2021 5 5 59339 0.1023 0.4579 -0.19269 2021 5 6 59340 0.1040 0.4585 -0.19286 2021 5 7 59341 0.1058 0.4590 -0.19312 2021 5 8 59342 0.1075 0.4595 -0.19342 2021 5 9 59343 0.1093 0.4600 -0.19371 2021 5 10 59344 0.1111 0.4604 -0.19394 2021 5 11 59345 0.1129 0.4608 -0.19406 2021 5 12 59346 0.1147 0.4612 -0.19402 2021 5 13 59347 0.1165 0.4615 -0.19381 2021 5 14 59348 0.1183 0.4619 -0.19344 2021 5 15 59349 0.1201 0.4622 -0.19294 2021 5 16 59350 0.1219 0.4624 -0.19237 2021 5 17 59351 0.1238 0.4627 -0.19178 2021 5 18 59352 0.1256 0.4629 -0.19126 2021 5 19 59353 0.1275 0.4631 -0.19088 2021 5 20 59354 0.1293 0.4633 -0.19070 2021 5 21 59355 0.1312 0.4634 -0.19076 2021 5 22 59356 0.1330 0.4635 -0.19105 2021 5 23 59357 0.1349 0.4636 -0.19149 2021 5 24 59358 0.1367 0.4636 -0.19197 2021 5 25 59359 0.1386 0.4637 -0.19233 2021 5 26 59360 0.1405 0.4636 -0.19245 2021 5 27 59361 0.1423 0.4636 -0.19228 2021 5 28 59362 0.1442 0.4636 -0.19184 2021 5 29 59363 0.1461 0.4635 -0.19124 2021 5 30 59364 0.1479 0.4633 -0.19059 2021 5 31 59365 0.1498 0.4632 -0.19000 2021 6 1 59366 0.1516 0.4630 -0.18952 2021 6 2 59367 0.1535 0.4628 -0.18916 2021 6 3 59368 0.1554 0.4626 -0.18888 2021 6 4 59369 0.1572 0.4623 -0.18865 2021 6 5 59370 0.1591 0.4620 -0.18840 2021 6 6 59371 0.1609 0.4617 -0.18807 2021 6 7 59372 0.1627 0.4614 -0.18763 2021 6 8 59373 0.1646 0.4610 -0.18702 2021 6 9 59374 0.1664 0.4606 -0.18622 2021 6 10 59375 0.1682 0.4601 -0.18523 2021 6 11 59376 0.1700 0.4597 -0.18408 2021 6 12 59377 0.1718 0.4592 -0.18279 2021 6 13 59378 0.1736 0.4587 -0.18145 2021 6 14 59379 0.1754 0.4581 -0.18011 2021 6 15 59380 0.1772 0.4576 -0.17885 2021 6 16 59381 0.1790 0.4570 -0.17773 2021 6 17 59382 0.1807 0.4563 -0.17680 2021 6 18 59383 0.1825 0.4557 -0.17605 2021 6 19 59384 0.1842 0.4550 -0.17547 2021 6 20 59385 0.1860 0.4543 -0.17497 2021 6 21 59386 0.1877 0.4536 -0.17444 2021 6 22 59387 0.1894 0.4528 -0.17376 2021 6 23 59388 0.1911 0.4520 -0.17286 2021 6 24 59389 0.1927 0.4512 -0.17172 2021 6 25 59390 0.1944 0.4504 -0.17044 2021 6 26 59391 0.1961 0.4495 -0.16913 2021 6 27 59392 0.1977 0.4486 -0.16791 2021 6 28 59393 0.1993 0.4477 -0.16687 2021 6 29 59394 0.2009 0.4467 -0.16602 2021 6 30 59395 0.2025 0.4458 -0.16533 2021 7 1 59396 0.2041 0.4448 -0.16477 2021 7 2 59397 0.2056 0.4438 -0.16427 2021 7 3 59398 0.2071 0.4427 -0.16377 2021 7 4 59399 0.2087 0.4416 -0.16322 2021 7 5 59400 0.2102 0.4406 -0.16259 2021 7 6 59401 0.2116 0.4394 -0.16184 2021 7 7 59402 0.2131 0.4383 -0.16096 2021 7 8 59403 0.2145 0.4371 -0.15996 2021 7 9 59404 0.2159 0.4360 -0.15889 2021 7 10 59405 0.2173 0.4348 -0.15780 2021 7 11 59406 0.2187 0.4335 -0.15676 2021 7 12 59407 0.2201 0.4323 -0.15587 2021 7 13 59408 0.2214 0.4310 -0.15517 2021 7 14 59409 0.2227 0.4297 -0.15469 2021 7 15 59410 0.2240 0.4284 -0.15443 2021 7 16 59411 0.2252 0.4271 -0.15436 2021 7 17 59412 0.2265 0.4257 -0.15440 2021 7 18 59413 0.2277 0.4244 -0.15444 2021 7 19 59414 0.2289 0.4230 -0.15437 2021 7 20 59415 0.2300 0.4216 -0.15411 2021 7 21 59416 0.2312 0.4201 -0.15357 2021 7 22 59417 0.2323 0.4187 -0.15279 2021 7 23 59418 0.2334 0.4172 -0.15190 2021 7 24 59419 0.2344 0.4157 -0.15102 2021 7 25 59420 0.2355 0.4142 -0.15033 2021 7 26 59421 0.2365 0.4127 -0.14983 2021 7 27 59422 0.2375 0.4112 -0.14947 2021 7 28 59423 0.2384 0.4096 -0.14923 2021 7 29 59424 0.2393 0.4081 -0.14905 2021 7 30 59425 0.2402 0.4065 -0.14875 2021 7 31 59426 0.2411 0.4049 -0.14835 2021 8 1 59427 0.2419 0.4033 -0.14782 2021 8 2 59428 0.2427 0.4017 -0.14706 2021 8 3 59429 0.2435 0.4000 -0.14615 2021 8 4 59430 0.2443 0.3984 -0.14515 2021 8 5 59431 0.2450 0.3967 -0.14406 2021 8 6 59432 0.2457 0.3951 -0.14290 2021 8 7 59433 0.2464 0.3934 -0.14175 2021 8 8 59434 0.2470 0.3917 -0.14070 2021 8 9 59435 0.2476 0.3900 -0.13984 2021 8 10 59436 0.2482 0.3883 -0.13919 2021 8 11 59437 0.2487 0.3865 -0.13870 2021 8 12 59438 0.2492 0.3848 -0.13836 2021 8 13 59439 0.2497 0.3831 -0.13812 2021 8 14 59440 0.2501 0.3813 -0.13786 2021 8 15 59441 0.2506 0.3796 -0.13749 2021 8 16 59442 0.2509 0.3778 -0.13692 2021 8 17 59443 0.2513 0.3760 -0.13614 2021 8 18 59444 0.2516 0.3742 -0.13525 2021 8 19 59445 0.2519 0.3725 -0.13429 2021 8 20 59446 0.2522 0.3707 -0.13333 2021 8 21 59447 0.2524 0.3689 -0.13245 2021 8 22 59448 0.2526 0.3671 -0.13177 2021 8 23 59449 0.2527 0.3653 -0.13138 2021 8 24 59450 0.2529 0.3635 -0.13126 2021 8 25 59451 0.2529 0.3617 -0.13132 2021 8 26 59452 0.2530 0.3598 -0.13144 2021 8 27 59453 0.2530 0.3580 -0.13153 2021 8 28 59454 0.2530 0.3562 -0.13154 2021 8 29 59455 0.2530 0.3544 -0.13139 2021 8 30 59456 0.2529 0.3526 -0.13106 2021 8 31 59457 0.2528 0.3508 -0.13057 2021 9 1 59458 0.2527 0.3490 -0.12994 2021 9 2 59459 0.2525 0.3471 -0.12923 2021 9 3 59460 0.2523 0.3453 -0.12849 2021 9 4 59461 0.2521 0.3435 -0.12780 2021 9 5 59462 0.2518 0.3417 -0.12725 2021 9 6 59463 0.2515 0.3399 -0.12690 2021 9 7 59464 0.2512 0.3381 -0.12675 2021 9 8 59465 0.2508 0.3363 -0.12679 2021 9 9 59466 0.2504 0.3345 -0.12699 2021 9 10 59467 0.2500 0.3328 -0.12719 2021 9 11 59468 0.2495 0.3310 -0.12729 2021 9 12 59469 0.2490 0.3292 -0.12720 2021 9 13 59470 0.2485 0.3274 -0.12691 2021 9 14 59471 0.2479 0.3257 -0.12646 2021 9 15 59472 0.2474 0.3239 -0.12585 2021 9 16 59473 0.2467 0.3222 -0.12527 2021 9 17 59474 0.2461 0.3205 -0.12486 2021 9 18 59475 0.2454 0.3187 -0.12466 2021 9 19 59476 0.2447 0.3170 -0.12471 2021 9 20 59477 0.2439 0.3153 -0.12501 2021 9 21 59478 0.2432 0.3136 -0.12548 2021 9 22 59479 0.2423 0.3119 -0.12599 2021 9 23 59480 0.2415 0.3103 -0.12651 2021 9 24 59481 0.2406 0.3086 -0.12696 2021 9 25 59482 0.2397 0.3070 -0.12726 2021 9 26 59483 0.2388 0.3053 -0.12746 2021 9 27 59484 0.2378 0.3037 -0.12756 2021 9 28 59485 0.2369 0.3021 -0.12751 2021 9 29 59486 0.2358 0.3005 -0.12738 2021 9 30 59487 0.2348 0.2989 -0.12729 2021 10 1 59488 0.2337 0.2974 -0.12732 2021 10 2 59489 0.2326 0.2958 -0.12746 2021 10 3 59490 0.2315 0.2943 -0.12780 2021 10 4 59491 0.2303 0.2928 -0.12838 2021 10 5 59492 0.2291 0.2913 -0.12920 2021 10 6 59493 0.2279 0.2898 -0.13023 2021 10 7 59494 0.2267 0.2884 -0.13135 2021 10 8 59495 0.2254 0.2869 -0.13240 2021 10 9 59496 0.2241 0.2855 -0.13327 2021 10 10 59497 0.2228 0.2841 -0.13388 2021 10 11 59498 0.2215 0.2828 -0.13426 2021 10 12 59499 0.2201 0.2814 -0.13449 2021 10 13 59500 0.2187 0.2801 -0.13470 2021 10 14 59501 0.2173 0.2787 -0.13494 2021 10 15 59502 0.2158 0.2774 -0.13522 2021 10 16 59503 0.2144 0.2762 -0.13556 2021 10 17 59504 0.2129 0.2749 -0.13604 2021 10 18 59505 0.2114 0.2737 -0.13663 2021 10 19 59506 0.2099 0.2725 -0.13726 2021 10 20 59507 0.2083 0.2713 -0.13788 2021 10 21 59508 0.2067 0.2701 -0.13842 2021 10 22 59509 0.2051 0.2690 -0.13881 2021 10 23 59510 0.2035 0.2679 -0.13907 2021 10 24 59511 0.2019 0.2668 -0.13923 2021 10 25 59512 0.2002 0.2657 -0.13931 2021 10 26 59513 0.1985 0.2647 -0.13928 2021 10 27 59514 0.1968 0.2637 -0.13920 2021 10 28 59515 0.1951 0.2627 -0.13910 2021 10 29 59516 0.1934 0.2617 -0.13912 2021 10 30 59517 0.1916 0.2608 -0.13937 2021 10 31 59518 0.1899 0.2599 -0.13988 2021 11 1 59519 0.1881 0.2590 -0.14065 2021 11 2 59520 0.1863 0.2582 -0.14169 2021 11 3 59521 0.1845 0.2573 -0.14295 2021 11 4 59522 0.1826 0.2566 -0.14425 2021 11 5 59523 0.1808 0.2558 -0.14549 2021 11 6 59524 0.1789 0.2550 -0.14655 2021 11 7 59525 0.1771 0.2543 -0.14743 2021 11 8 59526 0.1752 0.2537 -0.14811 2021 11 9 59527 0.1733 0.2530 -0.14867 2021 11 10 59528 0.1714 0.2524 -0.14923 2021 11 11 59529 0.1695 0.2518 -0.14989 2021 11 12 59530 0.1675 0.2512 -0.15068 2021 11 13 59531 0.1656 0.2507 -0.15166 2021 11 14 59532 0.1636 0.2502 -0.15278 2021 11 15 59533 0.1617 0.2497 -0.15402 2021 11 16 59534 0.1597 0.2493 -0.15527 2021 11 17 59535 0.1577 0.2488 -0.15641 2021 11 18 59536 0.1557 0.2485 -0.15738 2021 11 19 59537 0.1538 0.2481 -0.15810 2021 11 20 59538 0.1518 0.2478 -0.15849 2021 11 21 59539 0.1498 0.2475 -0.15863 2021 11 22 59540 0.1477 0.2472 -0.15858 2021 11 23 59541 0.1457 0.2470 -0.15840 2021 11 24 59542 0.1437 0.2468 -0.15819 2021 11 25 59543 0.1417 0.2466 -0.15798 2021 11 26 59544 0.1397 0.2465 -0.15784 2021 11 27 59545 0.1376 0.2464 -0.15787 2021 11 28 59546 0.1356 0.2463 -0.15816 2021 11 29 59547 0.1336 0.2463 -0.15871 2021 11 30 59548 0.1315 0.2463 -0.15948 2021 12 1 59549 0.1295 0.2463 -0.16048 2021 12 2 59550 0.1275 0.2463 -0.16153 2021 12 3 59551 0.1254 0.2464 -0.16238 2021 12 4 59552 0.1234 0.2465 -0.16300 2021 12 5 59553 0.1214 0.2467 -0.16341 2021 12 6 59554 0.1194 0.2469 -0.16365 2021 12 7 59555 0.1173 0.2471 -0.16382 2021 12 8 59556 0.1153 0.2473 -0.16405 2021 12 9 59557 0.1133 0.2476 -0.16442 2021 12 10 59558 0.1113 0.2479 -0.16495 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) 59171 -112.20 0.22 -6.79 0.07 59172 -112.09 0.22 -6.86 0.07 59173 -111.96 0.22 -7.11 0.07 59174 -111.86 0.28 -7.21 0.06 59175 -111.85 0.28 -7.02 0.06 59176 -111.81 0.46 -6.73 0.07 59177 -111.68 0.57 -6.54 0.07 59178 -111.53 0.57 -6.45 0.07 IAU2000A Celestial Pole Offset Series MJD dX error dY error (msec. of arc) 59171 0.063 0.087 0.010 0.074 59172 0.069 0.087 0.014 0.074 59173 0.082 0.087 0.020 0.074 59174 0.100 0.110 0.027 0.060 59175 0.123 0.110 0.035 0.060 59176 0.148 0.181 0.043 0.066 59177 0.175 0.228 0.052 0.070 59178 0.203 0.228 0.061 0.070 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).