ISSN 1143-1393 Circular T 182 (2003 March 19) Circulaire T 182 1 - Coordinated Universal Time UTC. Computed values of [UTC-UTC(k)]. (From 1999 January 1, 0h UTC, TAI-UTC = 32 s) Date 2003 0h UTC Jan 30 Feb 4 Feb 9 Feb 14 MJD 52669 52674 52679 52684 Laboratory k [UTC-UTC(k)]/ns AOS (Borowiec) -71 -78 -98 -113 AUS (Sydney) -145 -145 -168 -168 BEV (Wien) 104 105 107 112 BIRM (Beijing) 800 - - - CAO (Cagliari) - - - - CH (Bern) -16 -9 -5 -7 CNM (Queretaro) 136 129 123 116 CRL (Tokyo) -18 -17 -10 -1 CSIR (Pretoria) - - - - DLR (Oberpfaffenhofen) - - - - DTAG (Darmstadt) 408 414 435 440 IEN (Torino) 4 10 10 7 IFAG (Wettzell) -1781 -1828 -1837 -1827 IGMA (Buenos Aires) (1) -92 -93 -80 -91 INPL (Jerusalem) -6834 -6877 -6916 -6976 IPQ (Monte de Caparica) - - - - JATC (Lintong) -12009 -12020 -12055 -12045 KRIS (Daejon) - -12 -12 -12 LDS (Leeds) 2870 2917 2945 2968 LT (Vilnius) -223 -214 -205 -192 MSL (Lower Hutt) -66 -78 -79 -81 NAO (Mizusawa) -17 -16 -14 -14 NIM (Beijing) -2616 -2611 -2613 -2617 NIMB (Bucharest) 258 238 210 187 NIMT (Bangkok) -476 -487 -501 -526 NIST (Boulder) 2 4 7 5 NMC (Sofiya) -2470 -2478 -2477 -2495 NMIJ (Tsukuba) 233 222 212 203 NMLS (Shah Alam) 222 218 208 181 NPL (Teddington) 33 35 37 36 NPLI (New-Delhi) 3246 3304 3348 3383 NRC (Ottawa) 47 42 45 41 NTSC (Lintong) -13 -10 -5 -7 OMH (Budapest) 7649 7640 7659 7679 ONBA (Buenos Aires) -679 -470 -483 -475 ONRJ (Rio de Janeiro) 5243 5254 5272 5282 OP (Paris) -31 -37 -35 -40 ORB (Bruxelles) -25 -20 -13 -11 PL (Warszawa) 43 50 51 56 PTB (Braunschweig) -14 -12 -10 -8 ROA (San Fernando) 85 89 93 89 SCL (Hong Kong) 29 16 6 11 SG (Singapore) -70 -74 -78 -82 SMU (Bratislava) -7655 -7694 -7707 -7736 SP (Boras) -170 -182 -174 -171 SU (Moskva) 23 21 25 25 TCC (Concepcion) -2004 -2048 -2103 -2154 TL (Chung-Li) -26 -36 -51 -52 TP (Praha) -49 -45 -51 -46 UME (Gebze-Kocaeli) -828 -836 -834 -842 USNO (Washington DC)(USNO MC) 4 5 6 4 VSL (Delft) -34 -41 -35 -30 BIPM , T 182 (2) 1 - Coordinated Universal Time UTC. (Cont.) Date 2003 0h UTC Feb 19 Feb 24 MJD 52689 52694 Laboratory k [UTC-UTC(k)]/ns AOS (Borowiec) -113 -128 AUS (Sydney) -163 -170 BEV (Wien) 121 124 BIRM (Beijing) - - CAO (Cagliari) - - CH (Bern) -10 -11 CNM (Queretaro) 112 107 CRL (Tokyo) 4 3 CSIR (Pretoria) - - DLR (Oberpfaffenhofen) - - DTAG (Darmstadt) 447 435 IEN (Torino) 13 11 IFAG (Wettzell) -1836 -1838 IGMA (Buenos Aires) -87 -84 INPL (Jerusalem) -7023 -7079 IPQ (Monte de Caparica) - - JATC (Lintong) -12034 -12023 KRIS (Daejon) 7 -7 LDS (Leeds) 3002 3031 LT (Vilnius) -177 -165 MSL (Lower Hutt) -63 -62 NAO (Mizusawa) -14 -16 NIM (Beijing) -2610 -2615 NIMB (Bucharest) 213 190 NIMT (Bangkok) -555 -584 NIST (Boulder) 8 8 NMC (Sofiya) -2504 -2514 NMIJ (Tsukuba) 197 190 NMLS (Shah Alam) 173 149 NPL (Teddington) 39 40 NPLI (New-Delhi) 3449 3497 NRC (Ottawa) 30 22 NTSC (Lintong) -6 -14 OMH (Budapest) 7665 7673 ONBA (Buenos Aires) -585 -705 ONRJ (Rio de Janeiro) 5288 5300 OP (Paris) -42 -50 ORB (Bruxelles) -6 -5 PL (Warszawa) 68 68 PTB (Braunschweig) -5 -4 ROA (San Fernando) 98 94 SCL (Hong Kong) 10 4 SG (Singapore) -87 -90 SMU (Bratislava) -7754 -7760 SP (Boras) -173 -170 SU (Moskva) 28 28 TCC (Concepcion) -2204 -2262 TL (Chung-Li) -40 -47 TP (Praha) -43 -39 UME (Gebze-Kocaeli) -849 -855 USNO (Washington DC)(USNO MC) 5 5 VSL (Delft) -33 -31 BIPM , T 182 (3) 2 - International Atomic Time TAI and local atomic time scales TA(k). The following table gives the computed values of [TAI-TA(k)]. Date 2003 0h UTC Jan 30 Feb 4 Feb 9 Feb 14 MJD 52669 52674 52679 52684 Laboratory k [TAI-TA(k)]/ns AUS (Sydney) -119344 -119431 -119523 -119615 CH (Bern) 28645 28821 28995 29162 CRL (Tokyo) 168496 168699 168905 169108 F (Paris) 168765 168781 168800 168812 IEN (Torino) 24699 24817 24937 25059 JATC (Lintong) -27674 -27808 -27955 -28063 KRIS (Taejon) -18 6071 6075 6081 NIST (Boulder) -45245392 -45245592 -45245792 -45245996 NRC (Ottawa) 28457 28457 28464 28465 NTSC (Lintong) -59 -59 -55 -53 PL (Warszawa) -1151 -1156 -1168 -1179 PTB (Braunschweig) -359624 -359617 -359610 -359603 SU (Moskva) (2) 27241023 27241021 27241025 27241025 USNO (Washington DC) -34902523 -34902831 -34903140 -34903452 Date 2003 0h UTC Feb 19 Feb 24 MJD 52689 52694 Laboratory k [TAI-TA(k)]/ns AUS (Sydney) -119694 -119780 CH (Bern) 29329 29501 CRL (Tokyo) 169313 169514 F (Paris) 168826 168839 IEN (Torino) 25181 25297 JATC (Lintong) -28167 -28278 KRIS (Taejon) 6092 6083 NIST (Boulder) -45246196 -45246398 NRC (Ottawa) 28458 28454 NTSC (Lintong) -43 -43 PL (Warszawa) -1177 -1186 PTB (Braunschweig) -359595 -359589 SU (Moskva) (2) 27241028 27241028 USNO (Washington DC) -34903762 -34904072 3 - Notes on sections 1 and 2. (1) IGMA. Change of master clock on MJD = 52682 (2) SU . Listed values are TAI-TA(SU) - 2.80 seconds. BIPM , T 182 (4) 4 - Difference between the normalized frequencies of EAL and TAI. Interval of validity f(EAL)-f(TAI) 2003 Jan. 30 - 2003 Mar. 31 52669-52729 6.980x10**-13 New steering correction foreseen for April 2003 2003 Mar. 31 - 2003 Apr. 30 52729-52759 6.970x10**-13 5 - Duration of the TAI scale interval. TAI is a realization of coordinate time TT. The following tables give the fractional deviation d of the scale interval of TAI from that of TT (the SI second on the geoid), i.e. the fractional frequency deviation of TAI with the opposite sign: d = -yTAI. In this section, a frequency over a time interval is defined as the ratio of the end-point phase difference to the duration of the interval. Whenever needed, the instability of EAL should be expressed as the quadratic sum of three components: a white frequency noise 6.0x10**-15 / sqrt(t), a flicker frequency noise 0.6x10**-15, a random walk frequency noise 1.6x10**-16 x sqrt(t), with t in days. The relation between EAL and TAI is given in Circular T and the Annual Report of the BIPM Time Section. In the first table, d is obtained, on the given periods of estimation by comparison of the TAI frequency with that of the given individual primary standards (PFS). In this table uB is the combined uncertainty from systematic effects, Ref(uB) is a reference giving information on the stated value of uB or is the Circular T where this reference was first given, uA is the uncertainty originating in the instability of the PFS, ulink/lab is the uncertainty in the link between the PFS and the clock participating to TAI, ulink/TAI is the uncertainty in the link to TAI, u is the quadratic sum of all four uncertainty values. Standard Period of d uB Ref(uB) uA ul/lab ul/TAI Notes u estimation (10-15)(10-15) (10-15)(10-15) (10-15) (10-15) SYRTE-JPO 52664-52694 5.8 8. T160 1.7 0.3 1. 8.2 PTB CS1 52669-52694 -1.2 8. T148 5. 0. 1. (1) 9. PTB CS2 52669-52694 0.6 12. T148 3. 0. 1. (1) 12. NIST-F1 52679-52694 11.1 0.7 [1] 1.2 0.3 2. (2) 2.5 [1] Jefferts S.R. et al., Metrologia, 39, pp. 321-336, 2002. Notes: (1) Continuously operating as a clock participating to TAI. (2) Report 26 February 2003 by NIST. The second table gives the BIPM estimate of d, based on measurements of CRL-O1, SYRTE-JPO, NIST-F1, PTB CS1, PTB CS2 and PTBCSF1 over the period MJD 52304-52694, taking into account their individual uncertainties and characterizing the instability of EAL as noted above. u is the computed standard uncertainty of d. Period of estimation d u 52669-52694 +8.4x10**-15 1.9x10**-15 BIPM , T 182 (5) 6 - [UTC-GPS time] and [TAI-GPS time]. [UTC-GPS time] = -13 s + C0, [TAI-GPS time] = 19 s + C0. Daily values of C0 are given in the following table. They are obtained as follows: the GPS data taken at the Paris Observatory, for highest elevation, are first corrected for precise satellite ephemerides and for measured ionospheric delays, and then smoothed to obtain daily values of [UTC(OP)-GPS time] at 0h UTC; daily values of C0 are derived from them using linear interpolation of [UTC-UTC(OP)]. The global uncertainty of daily C0 values is of order 10 ns. In the following table, the standard deviation s characterizes the dispersion of individual measurements, and N is the number of measurements used on a given day for estimation of the corresponding daily C0 value. Date 2003 MJD C0 s s/sqrt(N) 0h UTC (ns) (ns) (ns) Jan 30 52669 -2 3 0 Jan 31 52670 -1 3 1 Feb 1 52671 1 3 0 Feb 2 52672 1 3 0 Feb 3 52673 -1 3 0 Feb 4 52674 -1 3 0 Feb 5 52675 -2 4 1 Feb 6 52676 -3 3 0 Feb 7 52677 -4 3 0 Feb 8 52678 0 2 0 Feb 9 52679 1 3 0 Feb 10 52680 -2 3 0 Feb 11 52681 -2 3 0 Feb 12 52682 -4 3 0 Feb 13 52683 -5 2 0 Feb 14 52684 -4 3 0 Feb 15 52685 -5 3 0 Feb 16 52686 -5 3 0 Feb 17 52687 -1 3 0 Feb 18 52688 -5 3 0 Feb 19 52689 -4 3 0 Feb 20 52690 -4 3 0 Feb 21 52691 -2 3 0 Feb 22 52692 -2 3 0 Feb 23 52693 1 3 0 Feb 24 52694 0 3 0 BIPM , T 182 (6) 7 - [UTC-GLONASS time] and [TAI-GLONASS time]. [UTC-GLONASS time] = 0 s + C1, [TAI-GLONASS time] = +32 s + C1. Daily values of C1 are given in the following table. They are obtained as follows: the GLONASS data taken at the NMi Van Swinden Laboratorium, Delft, The Netherlands, for highest elevation, are smoothed to obtain daily values of [UTC(VSL)-GLONASS time] at 0h UTC; daily values of C1 are then derived from them using linear interpolation of [UTC-UTC(VSL)]. The global uncertainty of daily C1 values is of order several hundreds of nanoseconds. In the following table, the standard deviation s characterizes the dispersion of individual measurements, and N is the number of measurements used on a given day for estimation of the corresponding daily C1 value. Date 2003 MJD C1 s s/sqrt(N) 0h UTC (ns) (ns) (ns) Jan 30 52669 55 38 12 Jan 31 52670 58 29 9 Feb 1 52671 86 20 6 Feb 2 52672 75 40 13 Feb 3 52673 77 60 19 Feb 4 52674 62 22 7 Feb 5 52675 100 15 5 Feb 6 52676 150 18 6 Feb 7 52677 150 12 4 Feb 8 52678 165 30 9 Feb 9 52679 137 45 14 Feb 10 52680 110 32 10 Feb 11 52681 128 24 7 Feb 12 52682 161 37 12 Feb 13 52683 163 30 10 Feb 14 52684 200 12 4 Feb 15 52685 206 22 7 Feb 16 52686 204 40 13 Feb 17 52687 210 39 12 Feb 18 52688 191 36 11 Feb 19 52689 175 18 6 Feb 20 52690 184 26 8 Feb 21 52691 210 15 5 Feb 22 52692 241 6 2 Feb 23 52693 234 13 4 Feb 24 52694 210 37 12