********************************************************************** * * * I E R S B U L L E T I N - A * * * * Rapid Service/Prediction of Earth Orientation * ********************************************************************** 17 December 2020 Vol. XXXIII No. 051 ______________________________________________________________________ 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 11 59194 0.09037 .00009 0.28945 .00009 -0.179727 0.000016 20 12 12 59195 0.08928 .00009 0.29004 .00009 -0.180174 0.000017 20 12 13 59196 0.08808 .00009 0.29107 .00009 -0.180399 0.000015 20 12 14 59197 0.08673 .00009 0.29207 .00009 -0.180381 0.000012 20 12 15 59198 0.08540 .00009 0.29281 .00009 -0.180124 0.000012 20 12 16 59199 0.08413 .00009 0.29336 .00009 -0.179678 0.000011 20 12 17 59200 0.08296 .00009 0.29399 .00009 -0.179164 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 = 0.1202 - 0.0456 cos A - 0.0947 sin A + 0.0125 cos C + 0.0174 sin C y = 0.3642 - 0.0865 cos A + 0.0407 sin A + 0.0174 cos C - 0.0125 sin C UT1-UTC = -0.1696 + 0.00005 (MJD - 59208) - (UT2-UT1) where A = 2*pi*(MJD-59200)/365.25 and C = 2*pi*(MJD-59200)/435. TAI-UTC(MJD 59201) = 37.0 The accuracy may be estimated from the expressions: S x,y = 0.00068 (MJD-59200)**0.80 S t = 0.00025 (MJD-59200)**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 18 59201 0.0818 0.2946 -0.17876 2020 12 19 59202 0.0807 0.2953 -0.17850 2020 12 20 59203 0.0797 0.2962 -0.17837 2020 12 21 59204 0.0786 0.2971 -0.17835 2020 12 22 59205 0.0774 0.2980 -0.17841 2020 12 23 59206 0.0762 0.2988 -0.17851 2020 12 24 59207 0.0749 0.2996 -0.17858 2020 12 25 59208 0.0737 0.3003 -0.17859 2020 12 26 59209 0.0725 0.3011 -0.17848 2020 12 27 59210 0.0714 0.3018 -0.17825 2020 12 28 59211 0.0704 0.3027 -0.17788 2020 12 29 59212 0.0694 0.3036 -0.17736 2020 12 30 59213 0.0683 0.3045 -0.17673 2020 12 31 59214 0.0672 0.3055 -0.17608 2021 1 1 59215 0.0660 0.3065 -0.17548 2021 1 2 59216 0.0648 0.3073 -0.17503 2021 1 3 59217 0.0637 0.3082 -0.17481 2021 1 4 59218 0.0626 0.3091 -0.17483 2021 1 5 59219 0.0616 0.3100 -0.17507 2021 1 6 59220 0.0605 0.3109 -0.17546 2021 1 7 59221 0.0595 0.3119 -0.17590 2021 1 8 59222 0.0584 0.3129 -0.17627 2021 1 9 59223 0.0574 0.3139 -0.17648 2021 1 10 59224 0.0563 0.3149 -0.17647 2021 1 11 59225 0.0553 0.3159 -0.17624 2021 1 12 59226 0.0544 0.3170 -0.17583 2021 1 13 59227 0.0534 0.3180 -0.17535 2021 1 14 59228 0.0525 0.3191 -0.17490 2021 1 15 59229 0.0516 0.3202 -0.17456 2021 1 16 59230 0.0507 0.3214 -0.17436 2021 1 17 59231 0.0499 0.3225 -0.17429 2021 1 18 59232 0.0490 0.3237 -0.17432 2021 1 19 59233 0.0481 0.3248 -0.17440 2021 1 20 59234 0.0473 0.3260 -0.17448 2021 1 21 59235 0.0466 0.3272 -0.17452 2021 1 22 59236 0.0458 0.3284 -0.17446 2021 1 23 59237 0.0451 0.3296 -0.17428 2021 1 24 59238 0.0444 0.3309 -0.17397 2021 1 25 59239 0.0437 0.3322 -0.17355 2021 1 26 59240 0.0430 0.3335 -0.17305 2021 1 27 59241 0.0424 0.3348 -0.17254 2021 1 28 59242 0.0418 0.3361 -0.17207 2021 1 29 59243 0.0412 0.3374 -0.17172 2021 1 30 59244 0.0406 0.3387 -0.17158 2021 1 31 59245 0.0401 0.3401 -0.17166 2021 2 1 59246 0.0396 0.3414 -0.17196 2021 2 2 59247 0.0391 0.3428 -0.17242 2021 2 3 59248 0.0386 0.3442 -0.17292 2021 2 4 59249 0.0382 0.3456 -0.17336 2021 2 5 59250 0.0378 0.3470 -0.17363 2021 2 6 59251 0.0374 0.3484 -0.17369 2021 2 7 59252 0.0371 0.3498 -0.17352 2021 2 8 59253 0.0367 0.3512 -0.17318 2021 2 9 59254 0.0364 0.3526 -0.17276 2021 2 10 59255 0.0362 0.3541 -0.17237 2021 2 11 59256 0.0359 0.3555 -0.17208 2021 2 12 59257 0.0357 0.3570 -0.17193 2021 2 13 59258 0.0355 0.3584 -0.17194 2021 2 14 59259 0.0353 0.3599 -0.17208 2021 2 15 59260 0.0352 0.3613 -0.17230 2021 2 16 59261 0.0351 0.3628 -0.17254 2021 2 17 59262 0.0350 0.3643 -0.17274 2021 2 18 59263 0.0350 0.3658 -0.17286 2021 2 19 59264 0.0349 0.3672 -0.17285 2021 2 20 59265 0.0349 0.3687 -0.17271 2021 2 21 59266 0.0350 0.3702 -0.17244 2021 2 22 59267 0.0350 0.3717 -0.17206 2021 2 23 59268 0.0351 0.3732 -0.17163 2021 2 24 59269 0.0352 0.3747 -0.17123 2021 2 25 59270 0.0354 0.3762 -0.17094 2021 2 26 59271 0.0356 0.3777 -0.17085 2021 2 27 59272 0.0358 0.3792 -0.17102 2021 2 28 59273 0.0360 0.3806 -0.17146 2021 3 1 59274 0.0362 0.3821 -0.17212 2021 3 2 59275 0.0365 0.3836 -0.17289 2021 3 3 59276 0.0368 0.3851 -0.17364 2021 3 4 59277 0.0372 0.3866 -0.17424 2021 3 5 59278 0.0375 0.3881 -0.17464 2021 3 6 59279 0.0379 0.3895 -0.17480 2021 3 7 59280 0.0384 0.3910 -0.17479 2021 3 8 59281 0.0388 0.3925 -0.17468 2021 3 9 59282 0.0393 0.3939 -0.17456 2021 3 10 59283 0.0398 0.3954 -0.17452 2021 3 11 59284 0.0404 0.3968 -0.17462 2021 3 12 59285 0.0409 0.3983 -0.17487 2021 3 13 59286 0.0415 0.3997 -0.17526 2021 3 14 59287 0.0421 0.4012 -0.17576 2021 3 15 59288 0.0428 0.4026 -0.17629 2021 3 16 59289 0.0435 0.4040 -0.17681 2021 3 17 59290 0.0442 0.4054 -0.17725 2021 3 18 59291 0.0449 0.4068 -0.17757 2021 3 19 59292 0.0457 0.4082 -0.17775 2021 3 20 59293 0.0464 0.4096 -0.17779 2021 3 21 59294 0.0473 0.4109 -0.17771 2021 3 22 59295 0.0481 0.4123 -0.17756 2021 3 23 59296 0.0490 0.4137 -0.17740 2021 3 24 59297 0.0498 0.4150 -0.17731 2021 3 25 59298 0.0508 0.4163 -0.17738 2021 3 26 59299 0.0517 0.4176 -0.17768 2021 3 27 59300 0.0527 0.4189 -0.17827 2021 3 28 59301 0.0537 0.4202 -0.17913 2021 3 29 59302 0.0547 0.4215 -0.18016 2021 3 30 59303 0.0557 0.4228 -0.18122 2021 3 31 59304 0.0568 0.4240 -0.18217 2021 4 1 59305 0.0579 0.4252 -0.18288 2021 4 2 59306 0.0590 0.4264 -0.18332 2021 4 3 59307 0.0601 0.4276 -0.18351 2021 4 4 59308 0.0613 0.4288 -0.18355 2021 4 5 59309 0.0625 0.4300 -0.18353 2021 4 6 59310 0.0637 0.4311 -0.18355 2021 4 7 59311 0.0649 0.4323 -0.18368 2021 4 8 59312 0.0661 0.4334 -0.18395 2021 4 9 59313 0.0674 0.4345 -0.18435 2021 4 10 59314 0.0687 0.4356 -0.18486 2021 4 11 59315 0.0700 0.4366 -0.18542 2021 4 12 59316 0.0714 0.4377 -0.18597 2021 4 13 59317 0.0727 0.4387 -0.18645 2021 4 14 59318 0.0741 0.4397 -0.18682 2021 4 15 59319 0.0755 0.4407 -0.18704 2021 4 16 59320 0.0769 0.4417 -0.18711 2021 4 17 59321 0.0783 0.4426 -0.18704 2021 4 18 59322 0.0798 0.4435 -0.18686 2021 4 19 59323 0.0813 0.4444 -0.18664 2021 4 20 59324 0.0827 0.4453 -0.18644 2021 4 21 59325 0.0843 0.4462 -0.18635 2021 4 22 59326 0.0858 0.4470 -0.18645 2021 4 23 59327 0.0873 0.4478 -0.18679 2021 4 24 59328 0.0889 0.4486 -0.18741 2021 4 25 59329 0.0904 0.4494 -0.18825 2021 4 26 59330 0.0920 0.4501 -0.18921 2021 4 27 59331 0.0936 0.4508 -0.19011 2021 4 28 59332 0.0953 0.4515 -0.19083 2021 4 29 59333 0.0969 0.4522 -0.19126 2021 4 30 59334 0.0985 0.4529 -0.19141 2021 5 1 59335 0.1002 0.4535 -0.19134 2021 5 2 59336 0.1019 0.4541 -0.19116 2021 5 3 59337 0.1035 0.4547 -0.19098 2021 5 4 59338 0.1052 0.4552 -0.19089 2021 5 5 59339 0.1069 0.4558 -0.19092 2021 5 6 59340 0.1087 0.4563 -0.19106 2021 5 7 59341 0.1104 0.4567 -0.19130 2021 5 8 59342 0.1121 0.4572 -0.19159 2021 5 9 59343 0.1139 0.4576 -0.19187 2021 5 10 59344 0.1156 0.4580 -0.19208 2021 5 11 59345 0.1174 0.4584 -0.19219 2021 5 12 59346 0.1192 0.4587 -0.19214 2021 5 13 59347 0.1209 0.4590 -0.19192 2021 5 14 59348 0.1227 0.4593 -0.19155 2021 5 15 59349 0.1245 0.4596 -0.19104 2021 5 16 59350 0.1263 0.4598 -0.19045 2021 5 17 59351 0.1281 0.4600 -0.18986 2021 5 18 59352 0.1299 0.4602 -0.18933 2021 5 19 59353 0.1318 0.4604 -0.18893 2021 5 20 59354 0.1336 0.4605 -0.18874 2021 5 21 59355 0.1354 0.4606 -0.18878 2021 5 22 59356 0.1372 0.4607 -0.18906 2021 5 23 59357 0.1391 0.4607 -0.18949 2021 5 24 59358 0.1409 0.4607 -0.18996 2021 5 25 59359 0.1427 0.4607 -0.19030 2021 5 26 59360 0.1446 0.4607 -0.19041 2021 5 27 59361 0.1464 0.4606 -0.19022 2021 5 28 59362 0.1482 0.4605 -0.18977 2021 5 29 59363 0.1501 0.4604 -0.18916 2021 5 30 59364 0.1519 0.4602 -0.18851 2021 5 31 59365 0.1537 0.4601 -0.18792 2021 6 1 59366 0.1555 0.4599 -0.18745 2021 6 2 59367 0.1574 0.4596 -0.18709 2021 6 3 59368 0.1592 0.4594 -0.18683 2021 6 4 59369 0.1610 0.4591 -0.18662 2021 6 5 59370 0.1628 0.4587 -0.18640 2021 6 6 59371 0.1646 0.4584 -0.18611 2021 6 7 59372 0.1664 0.4580 -0.18572 2021 6 8 59373 0.1682 0.4576 -0.18517 2021 6 9 59374 0.1700 0.4572 -0.18444 2021 6 10 59375 0.1718 0.4567 -0.18355 2021 6 11 59376 0.1736 0.4562 -0.18250 2021 6 12 59377 0.1753 0.4557 -0.18135 2021 6 13 59378 0.1771 0.4552 -0.18015 2021 6 14 59379 0.1789 0.4546 -0.17899 2021 6 15 59380 0.1806 0.4540 -0.17792 2021 6 16 59381 0.1823 0.4534 -0.17700 2021 6 17 59382 0.1841 0.4527 -0.17627 2021 6 18 59383 0.1858 0.4521 -0.17573 2021 6 19 59384 0.1875 0.4514 -0.17531 2021 6 20 59385 0.1892 0.4506 -0.17494 2021 6 21 59386 0.1908 0.4499 -0.17447 2021 6 22 59387 0.1925 0.4491 -0.17380 2021 6 23 59388 0.1941 0.4483 -0.17284 2021 6 24 59389 0.1958 0.4474 -0.17159 2021 6 25 59390 0.1974 0.4466 -0.17014 2021 6 26 59391 0.1990 0.4457 -0.16861 2021 6 27 59392 0.2006 0.4448 -0.16714 2021 6 28 59393 0.2022 0.4438 -0.16581 2021 6 29 59394 0.2037 0.4429 -0.16464 2021 6 30 59395 0.2053 0.4419 -0.16362 2021 7 1 59396 0.2068 0.4409 -0.16270 2021 7 2 59397 0.2083 0.4399 -0.16181 2021 7 3 59398 0.2098 0.4388 -0.16092 2021 7 4 59399 0.2112 0.4377 -0.15997 2021 7 5 59400 0.2127 0.4366 -0.15894 2021 7 6 59401 0.2141 0.4355 -0.15779 2021 7 7 59402 0.2155 0.4343 -0.15652 2021 7 8 59403 0.2169 0.4331 -0.15514 2021 7 9 59404 0.2183 0.4320 -0.15370 2021 7 10 59405 0.2196 0.4307 -0.15224 2021 7 11 59406 0.2210 0.4295 -0.15086 2021 7 12 59407 0.2223 0.4282 -0.14962 2021 7 13 59408 0.2236 0.4270 -0.14860 2021 7 14 59409 0.2248 0.4256 -0.14784 2021 7 15 59410 0.2261 0.4243 -0.14734 2021 7 16 59411 0.2273 0.4230 -0.14706 2021 7 17 59412 0.2285 0.4216 -0.14690 2021 7 18 59413 0.2296 0.4202 -0.14675 2021 7 19 59414 0.2308 0.4188 -0.14650 2021 7 20 59415 0.2319 0.4174 -0.14605 2021 7 21 59416 0.2330 0.4160 -0.14539 2021 7 22 59417 0.2340 0.4145 -0.14455 2021 7 23 59418 0.2351 0.4131 -0.14362 2021 7 24 59419 0.2361 0.4116 -0.14274 2021 7 25 59420 0.2371 0.4101 -0.14201 2021 7 26 59421 0.2380 0.4085 -0.14148 2021 7 27 59422 0.2390 0.4070 -0.14113 2021 7 28 59423 0.2399 0.4054 -0.14086 2021 7 29 59424 0.2407 0.4039 -0.14067 2021 7 30 59425 0.2416 0.4023 -0.14048 2021 7 31 59426 0.2424 0.4007 -0.14025 2021 8 1 59427 0.2432 0.3991 -0.13991 2021 8 2 59428 0.2440 0.3975 -0.13941 2021 8 3 59429 0.2447 0.3958 -0.13880 2021 8 4 59430 0.2454 0.3942 -0.13799 2021 8 5 59431 0.2461 0.3925 -0.13703 2021 8 6 59432 0.2467 0.3908 -0.13603 2021 8 7 59433 0.2473 0.3892 -0.13505 2021 8 8 59434 0.2479 0.3875 -0.13425 2021 8 9 59435 0.2485 0.3858 -0.13366 2021 8 10 59436 0.2490 0.3840 -0.13328 2021 8 11 59437 0.2495 0.3823 -0.13314 2021 8 12 59438 0.2499 0.3806 -0.13320 2021 8 13 59439 0.2504 0.3789 -0.13328 2021 8 14 59440 0.2508 0.3771 -0.13334 2021 8 15 59441 0.2511 0.3754 -0.13328 2021 8 16 59442 0.2515 0.3736 -0.13296 2021 8 17 59443 0.2518 0.3718 -0.13243 2021 8 18 59444 0.2520 0.3700 -0.13175 2021 8 19 59445 0.2523 0.3683 -0.13096 2021 8 20 59446 0.2525 0.3665 -0.13015 2021 8 21 59447 0.2527 0.3647 -0.12943 2021 8 22 59448 0.2528 0.3629 -0.12887 2021 8 23 59449 0.2529 0.3611 -0.12850 2021 8 24 59450 0.2530 0.3593 -0.12828 2021 8 25 59451 0.2530 0.3575 -0.12808 2021 8 26 59452 0.2530 0.3557 -0.12786 2021 8 27 59453 0.2530 0.3539 -0.12756 2021 8 28 59454 0.2530 0.3521 -0.12715 2021 8 29 59455 0.2529 0.3503 -0.12659 2021 8 30 59456 0.2528 0.3485 -0.12586 2021 8 31 59457 0.2526 0.3467 -0.12500 2021 9 1 59458 0.2524 0.3449 -0.12412 2021 9 2 59459 0.2522 0.3431 -0.12322 2021 9 3 59460 0.2520 0.3413 -0.12233 2021 9 4 59461 0.2517 0.3395 -0.12152 2021 9 5 59462 0.2514 0.3377 -0.12091 2021 9 6 59463 0.2510 0.3359 -0.12062 2021 9 7 59464 0.2506 0.3341 -0.12072 2021 9 8 59465 0.2502 0.3323 -0.12114 2021 9 9 59466 0.2498 0.3305 -0.12175 2021 9 10 59467 0.2493 0.3288 -0.12243 2021 9 11 59468 0.2488 0.3270 -0.12304 2021 9 12 59469 0.2482 0.3253 -0.12343 2021 9 13 59470 0.2477 0.3235 -0.12357 2021 9 14 59471 0.2471 0.3218 -0.12347 2021 9 15 59472 0.2464 0.3200 -0.12321 2021 9 16 59473 0.2458 0.3183 -0.12289 2021 9 17 59474 0.2451 0.3166 -0.12260 2021 9 18 59475 0.2443 0.3149 -0.12242 2021 9 19 59476 0.2436 0.3132 -0.12241 2021 9 20 59477 0.2428 0.3115 -0.12253 2021 9 21 59478 0.2420 0.3098 -0.12273 2021 9 22 59479 0.2411 0.3082 -0.12293 2021 9 23 59480 0.2402 0.3065 -0.12310 2021 9 24 59481 0.2393 0.3049 -0.12316 2021 9 25 59482 0.2384 0.3032 -0.12306 2021 9 26 59483 0.2374 0.3016 -0.12281 2021 9 27 59484 0.2364 0.3000 -0.12244 2021 9 28 59485 0.2354 0.2985 -0.12198 2021 9 29 59486 0.2343 0.2969 -0.12143 2021 9 30 59487 0.2332 0.2953 -0.12092 2021 10 1 59488 0.2321 0.2938 -0.12057 2021 10 2 59489 0.2310 0.2923 -0.12041 2021 10 3 59490 0.2298 0.2908 -0.12051 2021 10 4 59491 0.2286 0.2893 -0.12096 2021 10 5 59492 0.2274 0.2878 -0.12169 2021 10 6 59493 0.2261 0.2864 -0.12264 2021 10 7 59494 0.2248 0.2849 -0.12372 2021 10 8 59495 0.2235 0.2835 -0.12476 2021 10 9 59496 0.2222 0.2821 -0.12561 2021 10 10 59497 0.2208 0.2807 -0.12628 2021 10 11 59498 0.2195 0.2794 -0.12674 2021 10 12 59499 0.2181 0.2781 -0.12697 2021 10 13 59500 0.2166 0.2767 -0.12714 2021 10 14 59501 0.2152 0.2754 -0.12740 2021 10 15 59502 0.2137 0.2742 -0.12784 2021 10 16 59503 0.2122 0.2729 -0.12843 2021 10 17 59504 0.2107 0.2717 -0.12917 2021 10 18 59505 0.2091 0.2705 -0.13003 2021 10 19 59506 0.2076 0.2693 -0.13093 2021 10 20 59507 0.2060 0.2682 -0.13182 2021 10 21 59508 0.2044 0.2670 -0.13262 2021 10 22 59509 0.2027 0.2659 -0.13327 2021 10 23 59510 0.2011 0.2648 -0.13376 2021 10 24 59511 0.1994 0.2638 -0.13407 2021 10 25 59512 0.1977 0.2627 -0.13424 2021 10 26 59513 0.1960 0.2617 -0.13435 2021 10 27 59514 0.1943 0.2607 -0.13446 2021 10 28 59515 0.1925 0.2598 -0.13459 2021 10 29 59516 0.1908 0.2589 -0.13473 2021 10 30 59517 0.1890 0.2580 -0.13491 2021 10 31 59518 0.1872 0.2571 -0.13530 2021 11 1 59519 0.1854 0.2562 -0.13592 2021 11 2 59520 0.1836 0.2554 -0.13674 2021 11 3 59521 0.1817 0.2546 -0.13772 2021 11 4 59522 0.1799 0.2538 -0.13873 2021 11 5 59523 0.1780 0.2531 -0.13958 2021 11 6 59524 0.1761 0.2524 -0.14024 2021 11 7 59525 0.1742 0.2517 -0.14068 2021 11 8 59526 0.1723 0.2511 -0.14095 2021 11 9 59527 0.1704 0.2504 -0.14109 2021 11 10 59528 0.1684 0.2499 -0.14121 2021 11 11 59529 0.1665 0.2493 -0.14138 2021 11 12 59530 0.1645 0.2488 -0.14172 2021 11 13 59531 0.1626 0.2483 -0.14229 2021 11 14 59532 0.1606 0.2478 -0.14302 2021 11 15 59533 0.1586 0.2473 -0.14382 2021 11 16 59534 0.1566 0.2469 -0.14465 2021 11 17 59535 0.1546 0.2465 -0.14546 2021 11 18 59536 0.1526 0.2462 -0.14616 2021 11 19 59537 0.1506 0.2459 -0.14677 2021 11 20 59538 0.1486 0.2456 -0.14726 2021 11 21 59539 0.1466 0.2453 -0.14767 2021 11 22 59540 0.1445 0.2451 -0.14801 2021 11 23 59541 0.1425 0.2449 -0.14826 2021 11 24 59542 0.1405 0.2447 -0.14853 2021 11 25 59543 0.1384 0.2446 -0.14886 2021 11 26 59544 0.1364 0.2445 -0.14930 2021 11 27 59545 0.1343 0.2444 -0.14994 2021 11 28 59546 0.1323 0.2444 -0.15084 2021 11 29 59547 0.1303 0.2444 -0.15202 2021 11 30 59548 0.1282 0.2444 -0.15339 2021 12 1 59549 0.1262 0.2444 -0.15481 2021 12 2 59550 0.1241 0.2445 -0.15614 2021 12 3 59551 0.1221 0.2446 -0.15721 2021 12 4 59552 0.1200 0.2448 -0.15786 2021 12 5 59553 0.1180 0.2450 -0.15816 2021 12 6 59554 0.1160 0.2452 -0.15822 2021 12 7 59555 0.1139 0.2454 -0.15818 2021 12 8 59556 0.1119 0.2457 -0.15817 2021 12 9 59557 0.1099 0.2460 -0.15825 2021 12 10 59558 0.1079 0.2464 -0.15844 2021 12 11 59559 0.1058 0.2467 -0.15874 2021 12 12 59560 0.1038 0.2471 -0.15915 2021 12 13 59561 0.1018 0.2476 -0.15959 2021 12 14 59562 0.0998 0.2480 -0.16000 2021 12 15 59563 0.0979 0.2485 -0.16043 2021 12 16 59564 0.0959 0.2491 -0.16080 2021 12 17 59565 0.0939 0.2496 -0.16096 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) 59179 -111.60 0.60 -6.33 0.06 59180 -111.62 0.60 -6.14 0.06 59181 -111.59 0.60 -5.97 0.06 59182 -111.55 0.12 -5.95 0.17 59183 -111.57 0.12 -6.07 0.17 59184 -111.60 0.12 -6.24 0.17 59185 -111.50 0.12 -6.35 0.17 59186 -111.27 0.12 -6.41 0.17 59187 -110.98 0.12 -6.43 0.17 59188 -110.73 0.32 -6.41 0.16 59189 -110.48 0.32 -6.35 0.16 59190 -110.23 0.32 -6.25 0.16 59191 -110.03 0.32 -6.14 0.16 IAU2000A Celestial Pole Offset Series MJD dX error dY error (msec. of arc) 59179 0.177 0.239 0.071 0.057 59180 0.170 0.239 0.085 0.057 59181 0.157 0.239 0.101 0.057 59182 0.139 0.049 0.117 0.168 59183 0.118 0.049 0.133 0.168 59184 0.095 0.049 0.150 0.168 59185 0.090 0.049 0.153 0.168 59186 0.090 0.049 0.153 0.168 59187 0.090 0.049 0.153 0.168 59188 0.090 0.128 0.153 0.160 59189 0.090 0.128 0.153 0.160 59190 0.090 0.128 0.153 0.160 59191 0.090 0.128 0.153 0.160 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).