********************************************************************** * * * I E R S B U L L E T I N - A * * * * Rapid Service/Prediction of Earth Orientation * ********************************************************************** 28 December 2023 Vol. XXXVI No. 052 ______________________________________________________________________ GENERAL INFORMATION: 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 = 0.0 seconds beginning 28 July 2022 at 0000 UTC Beginning 1 January 2017: TAI-UTC = 37.000 000 seconds *********************************************************************** * ANNOUNCEMENTS: * * * * NO leap second will be introduced at the end of December 2023. * * * * The primary source for IERS Rapid Service/Prediction Center (RS/PC) * * data products is the official IERS RS/PC website: * * https://maia.usno.navy.mil * * * * IERS RS/PC products are also available from: * * NASA CDDIS: https://cddis.nasa.gov/archive/products/iers/ * * NASA CDDIS: ftps://gdc.cddis.eosdis.nasa.gov/products/iers/ * * IERS Central Bureau: https://datacenter.iers.org/eop.php * * * * Questions about IERS RS/PC products can be emailed to: * * eopcp@us.navy.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 23 12 22 60300 0.16255 .00009 0.20047 .00009 0.009355 0.000020 23 12 23 60301 0.16008 .00009 0.20081 .00009 0.008739 0.000017 23 12 24 60302 0.15763 .00009 0.20126 .00009 0.008374 0.000019 23 12 25 60303 0.15502 .00009 0.20156 .00009 0.008368 0.000015 23 12 26 60304 0.15198 .00009 0.20178 .00009 0.008460 0.000015 23 12 27 60305 0.14890 .00009 0.20160 .00009 0.008534 0.000011 23 12 28 60306 0.14611 .00009 0.20144 .00009 0.008602 0.000004 _______________________________________________________________________ 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 = 0.1371 - 0.0359 cos A - 0.0895 sin A + 0.0421 cos C - 0.0694 sin C y = 0.3517 - 0.0806 cos A + 0.0273 sin A - 0.0694 cos C - 0.0421 sin C UT1-UTC = 0.0059 + 0.00005 (MJD - 60314) - (UT2-UT1) where A = 2*pi*(MJD-60306)/365.25 and C = 2*pi*(MJD-60306)/435. TAI-UTC(MJD 60307) = 37.0 The accuracy may be estimated from the expressions: S x,y = 0.00068 (MJD-60306)**0.80 S t = 0.00025 (MJD-60306)**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) 2023 12 29 60307 0.1434 0.2013 0.00879 2023 12 30 60308 0.1409 0.2014 0.00892 2023 12 31 60309 0.1384 0.2016 0.00893 2024 1 1 60310 0.1360 0.2019 0.00879 2024 1 2 60311 0.1335 0.2023 0.00853 2024 1 3 60312 0.1311 0.2028 0.00816 2024 1 4 60313 0.1286 0.2033 0.00775 2024 1 5 60314 0.1262 0.2038 0.00737 2024 1 6 60315 0.1237 0.2044 0.00707 2024 1 7 60316 0.1213 0.2050 0.00689 2024 1 8 60317 0.1189 0.2056 0.00687 2024 1 9 60318 0.1165 0.2063 0.00701 2024 1 10 60319 0.1142 0.2070 0.00720 2024 1 11 60320 0.1118 0.2077 0.00740 2024 1 12 60321 0.1095 0.2085 0.00750 2024 1 13 60322 0.1072 0.2093 0.00737 2024 1 14 60323 0.1049 0.2102 0.00697 2024 1 15 60324 0.1026 0.2110 0.00631 2024 1 16 60325 0.1003 0.2120 0.00549 2024 1 17 60326 0.0981 0.2129 0.00466 2024 1 18 60327 0.0959 0.2139 0.00397 2024 1 19 60328 0.0937 0.2149 0.00353 2024 1 20 60329 0.0915 0.2160 0.00339 2024 1 21 60330 0.0893 0.2171 0.00353 2024 1 22 60331 0.0872 0.2182 0.00390 2024 1 23 60332 0.0851 0.2194 0.00442 2024 1 24 60333 0.0830 0.2206 0.00500 2024 1 25 60334 0.0810 0.2218 0.00555 2024 1 26 60335 0.0789 0.2230 0.00601 2024 1 27 60336 0.0769 0.2243 0.00634 2024 1 28 60337 0.0749 0.2256 0.00652 2024 1 29 60338 0.0729 0.2270 0.00654 2024 1 30 60339 0.0710 0.2284 0.00642 2024 1 31 60340 0.0691 0.2298 0.00623 2024 2 1 60341 0.0672 0.2312 0.00603 2024 2 2 60342 0.0654 0.2327 0.00589 2024 2 3 60343 0.0635 0.2342 0.00586 2024 2 4 60344 0.0617 0.2357 0.00599 2024 2 5 60345 0.0600 0.2372 0.00630 2024 2 6 60346 0.0582 0.2388 0.00675 2024 2 7 60347 0.0565 0.2404 0.00728 2024 2 8 60348 0.0548 0.2420 0.00775 2024 2 9 60349 0.0532 0.2437 0.00802 2024 2 10 60350 0.0516 0.2454 0.00796 2024 2 11 60351 0.0500 0.2471 0.00756 2024 2 12 60352 0.0484 0.2488 0.00688 2024 2 13 60353 0.0469 0.2505 0.00607 ...... ....... 2024 11 10 60624 0.2451 0.2967 0.03644 2024 11 11 60625 0.2439 0.2954 0.03581 2024 11 12 60626 0.2427 0.2942 0.03499 2024 11 13 60627 0.2415 0.2930 0.03402 2024 11 14 60628 0.2403 0.2918 0.03304 2024 11 15 60629 0.2390 0.2906 0.03232 2024 11 16 60630 0.2378 0.2894 0.03200 2024 11 17 60631 0.2365 0.2883 0.03210 2024 11 18 60632 0.2352 0.2871 0.03236 2024 11 19 60633 0.2338 0.2860 0.03276 2024 11 20 60634 0.2325 0.2850 0.03315 2024 11 21 60635 0.2312 0.2839 0.03341 2024 11 22 60636 0.2298 0.2829 0.03358 2024 11 23 60637 0.2284 0.2819 0.03354 2024 11 24 60638 0.2270 0.2809 0.03334 2024 11 25 60639 0.2256 0.2800 0.03304 2024 11 26 60640 0.2241 0.2790 0.03272 2024 11 27 60641 0.2227 0.2781 0.03239 2024 11 28 60642 0.2212 0.2772 0.03220 2024 11 29 60643 0.2198 0.2764 0.03217 2024 11 30 60644 0.2183 0.2755 0.03241 2024 12 1 60645 0.2168 0.2747 0.03288 2024 12 2 60646 0.2153 0.2739 0.03349 2024 12 3 60647 0.2138 0.2732 0.03413 2024 12 4 60648 0.2122 0.2724 0.03474 2024 12 5 60649 0.2107 0.2717 0.03524 2024 12 6 60650 0.2091 0.2711 0.03564 2024 12 7 60651 0.2076 0.2704 0.03581 2024 12 8 60652 0.2060 0.2698 0.03568 2024 12 9 60653 0.2044 0.2692 0.03531 2024 12 10 60654 0.2029 0.2686 0.03481 2024 12 11 60655 0.2013 0.2680 0.03434 2024 12 12 60656 0.1997 0.2675 0.03414 2024 12 13 60657 0.1981 0.2670 0.03423 2024 12 14 60658 0.1965 0.2666 0.03468 2024 12 15 60659 0.1949 0.2661 0.03532 2024 12 16 60660 0.1933 0.2657 0.03607 2024 12 17 60661 0.1916 0.2653 0.03691 2024 12 18 60662 0.1900 0.2650 0.03763 2024 12 19 60663 0.1884 0.2646 0.03814 2024 12 20 60664 0.1868 0.2643 0.03838 2024 12 21 60665 0.1852 0.2640 0.03830 2024 12 22 60666 0.1835 0.2638 0.03825 2024 12 23 60667 0.1819 0.2636 0.03815 2024 12 24 60668 0.1803 0.2634 0.03804 2024 12 25 60669 0.1786 0.2632 0.03802 2024 12 26 60670 0.1770 0.2630 0.03817 2024 12 27 60671 0.1754 0.2629 0.03844 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) 60284 -111.04 1.04 -6.09 0.06 60285 -111.25 1.04 -5.83 0.06 60286 -111.64 1.04 -5.57 0.06 IAU2000A Celestial Pole Offset Series MJD dX error dY error (msec. of arc) 60284 0.420 0.415 -0.061 0.063 60285 0.408 0.415 -0.064 0.063 60286 0.395 0.415 -0.065 0.063