CIRCULAR T 185 ISSN 1143-1393 2003 JUNE 13, 11h UTC BUREAU INTERNATIONAL DES POIDS ET MESURES ORGANISATION INTERNATIONALE DE LA CONVENTION DU METRE PAVILLON DE BRETEUIL F-92312 SEVRES CEDEX TEL. +33 1 45 07 70 70 FAX. +33 1 45 34 20 21 tai@bipm.org 1 - Coordinated Universal Time UTC and its local realizations UTC(k). Computed values of [UTC-UTC(k)]. From 1999 January 1, 0h UTC, TAI-UTC = 32 s. Date 2003 0h UTC APR 30 MAY 5 MAY 10 MAY 15 MAY 20 MAY 25 MAY 30 MJD 52759 52764 52769 52774 52779 52784 52789 Laboratory k [UTC-UTC(k)]/ns AOS (Borowiec) -266.4 -271.8 -284.4 -292.4 -313.8 -321.9 -340.1 AUS (Sydney) -238.2 -243.6 -263.0 -270.5 -293.4 -297.8 -311.4 BEV (Wien) -20.1 -16.0 -16.8 -13.5 -14.7 -11.7 -13.0 BIRM (Beijing) - - 936.6 939.1 946.1 959.9 975.0 CAO (Cagliari) -4011.8 -4011.7 -4025.1 -4033.7 -4052.9 -4055.5 -4063.3 CH (Bern) 2.5 12.6 4.3 12.2 16.4 8.6 2.1 CNM (Queretaro) 63.8 66.1 64.6 67.1 56.7 45.4 44.7 CRL (Tokyo) 8.9 6.7 6.9 3.0 1.7 -1.6 -4.4 CSIR (Pretoria) - - - - - - - DLR (Oberpfaffenhofen) - - - - - - - DTAG (Darmstadt) 425.8 417.5 412.3 397.1 394.6 377.1 373.4 IEN (Torino) 50.2 55.0 52.8 51.4 46.3 40.2 35.2 IFAG (Wettzell) -1982.4 -1988.3 -2000.8 -2016.7 -2031.4 -2036.3 -2049.1 IGMA (Buenos Aires) -91.0 -97.9 -92.1 -87.9 -103.2 -100.0 -92.0 INPL (Jerusalem) -7611.4 -7662.1 -7705.8 -7747.3 -7793.8 -7832.6 -7873.6 IPQ (Monte de Caparica) - - - - - - - JATC (Lintong) -11829.8 -11812.2 -11793.5 -11776.4 -11754.8 -11735.6 -11720.8 JV (Kjeller) -6908.3 -7036.2 -7127.7 -7237.3 -7377.2 -7511.5 -7614.6 KRIS (Daejon) -53.2 -53.6 -64.2 -66.6 -68.3 -66.3 -68.2 LDS (Leeds) 3340.7 3360.2 3401.2 3423.3 3441.3 3455.2 3480.8 LT (Vilnius) -172.1 -175.1 -167.8 -167.9 -178.4 -191.5 -186.0 MSL (Lower Hutt) 81.4 74.1 84.9 119.8 113.1 106.7 105.5 NAO (Mizusawa) -10.5 -18.7 -6.8 -7.2 -5.9 -3.3 -1.2 NIM (Beijing) -2623.5 -2632.1 -2622.8 -2620.8 -2621.3 -2626.6 -2628.8 NIMB (Bucharest) 11.6 - - -437.1 -428.7 -466.7 -450.9 NIMT (Bangkok) -893.3 -922.8 -958.5 -980.3 -998.8 -1019.0 -1034.0 NIST (Boulder) 8.9 10.5 10.4 10.1 4.0 0.3 0.6 NMC (Sofiya) -2685.5 -2721.7 -2749.3 -2769.3 -2791.0 -2793.5 -2786.1 NMIJ (Tsukuba) 89.2 78.4 75.1 64.7 54.0 42.4 28.5 NMLS (Shah Alam) 281.6 278.8 290.3 297.6 290.2 314.4 322.4 NPL (Teddington) 31.6 32.3 30.0 28.9 25.9 27.1 24.8 NPLI (New-Delhi) 4093.1 4138.8 4190.0 4235.1 4263.8 4311.0 4357.5 NRC (Ottawa) 9.0 14.1 10.4 3.1 5.4 5.7 15.2 NTSC (Lintong) -6.1 -2.4 -1.1 -1.8 -1.7 -1.0 1.4 OMH (Budapest) 7808.6 7803.3 7815.4 7844.7 7858.3 7859.8 7879.8 ONBA (Buenos Aires) -450.9 -363.3 -196.9 -196.1 19.8 -865.8 -838.0 (1) ONRJ (Rio de Janeiro) 5435.0 5443.6 5461.0 5471.4 5477.0 5491.4 5495.0 OP (Paris) 18.9 22.0 18.0 19.7 19.6 26.8 31.8 ORB (Bruxelles) -30.7 -35.4 -40.6 -46.3 -50.0 -52.7 -52.8 PL (Warszawa) 124.1 122.7 109.1 101.1 94.3 85.3 70.7 PTB (Braunschweig) 9.2 7.1 6.3 10.0 5.9 10.5 10.0 ROA (San Fernando) 85.3 81.2 75.4 77.8 66.2 70.5 66.8 SCL (Hong Kong) -41.2 -38.0 -36.7 -39.7 -39.6 -35.8 -26.4 SG (Singapore) 282.7 328.2 382.3 425.5 469.8 390.1 317.6 SMU (Bratislava) -8023.5 -8026.9 -8059.5 -8073.4 -8118.5 -8146.1 -8163.9 SP (Boras) -147.9 -146.3 -134.8 -136.1 -126.3 -117.6 -118.2 SU (Moskva) 40.1 41.0 40.0 41.2 41.2 42.6 36.8 TCC (Concepcion) -2957.7 -3022.1 -3073.6 -3135.7 -3166.1 -3203.5 -3236.5 TL (Chung-Li) -54.9 -56.3 -55.7 -57.1 -60.3 -60.3 -53.3 (2) TP (Praha) -24.5 -37.3 -20.9 -24.8 -17.1 -10.5 -8.3 UME (Gebze-Kocaeli) -967.4 -1027.7 - - - - -22.6 USNO (Washington DC) -0.6 1.0 -0.7 -0.5 -2.3 -2.0 -2.3 VSL (Delft) -5.9 -7.7 -7.0 -5.3 -12.3 -17.0 -13.8 - Notes on section 1: (1) ONBA: Apparent time steps of UTC - UTC(ONBA) between MJD = 52769 and MJD = 52774 and between MJD = 52779 and MJD = 52784 (2) TL : Change of master clock on MJD = 52778.04 2 - International Atomic Time TAI and Local atomic time scales TA(k). Computed values of [TAI-TA(k)]. Date 2003 0h UTC APR 30 MAY 5 MAY 10 MAY 15 MAY 20 MAY 25 MAY 30 MJD 52759 52764 52769 52774 52779 52784 52789 Laboratory k [TAI-TA(k)]/ns AUS (Sydney) -120864.2 -120942.6 -121042.0 -121113.5 -121206.4 -121292.8 -121353.4 CH (Bern) 31638.2 31813.3 31969.9 32142.7 32311.9 32469.0 32627.5 CRL (Tokyo) 172153.4 172353.7 172555.9 172755.6 172954.3 173154.8 173356.3 F (Paris) 169014.6 169023.3 169029.9 169040.8 169047.2 169058.4 169069.0 IEN (Torino) 26882.8 27001.0 27118.3 27236.8 27361.2 27477.5 27597.3 JATC (Lintong) -29649.8 -29757.2 -29861.5 -29971.4 -30078.8 -30181.6 -30285.8 KRIS (Taejon) 6014.1 6017.6 6014.5 6014.6 6017.7 6022.9 6022.5 NIST (Boulder) -45249003.5 -45249201.7 -45249401.8 -45249602.1 -45249804.2 -45250002.9 -45250197.6 NRC (Ottawa) 28496.8 28506.2 28506.7 28503.6 28510.3 28514.9 28528.8 NTSC (Lintong) 6.3 7.6 13.8 16.3 23.7 30.0 34.9 PL (Warszawa) -1337.9 -1346.3 -1361.9 -1379.9 -1400.7 -1410.7 -1431.3 PTB (Braunschweig) -359510.5 -359507.6 -359503.4 -359494.7 -359493.9 -359484.6 -359480.1 SU (Moskva) 27241040.1 27241041.0 27241040.0 27241041.2 27241041.2 27241042.6 27241036.8 (1) USNO (Washington DC) -34908105.3 -34908414.7 -34908725.4 -34909035.1 -34909345.7 -34909655.4 -34909965.0 - Note on section 2: (1) SU : Listed values are TAI-TA(SU) - 2.80 seconds. 3 - Difference between the normalized frequencies of EAL (free atomic time scale) and TAI. Interval of validity f(EAL)-f(TAI) 2003 Mar. 31 - 2003 May 30 52729-52789 6.970x10**-13 New steering correction for June and July 2003 2003 May 30 - 2003 July 29 52789-52849 6.960x10**-13 4 - 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 with t in days: (1) a white frequency noise of 6.0x10**-15 / sqrt(t), (2) a flicker frequency noise of 0.6x10**-15 and (3) a random walk frequency noise of 1.6x10**-16 x sqrt(t). 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 Frequency Standards (PFS). In this table: uA is the uncertainty originating in the instability of the PFS, 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, ul/lab is the uncertainty in the link between the PFS and the clock participating to TAI, including the uncertainty due to the dead-time, ul/TAI is the uncertainty in the link to TAI, u is the quadratic sum of all four uncertainty values. All values are expressed in 10**-15. Standard Period of d uA uB Ref(uB) ul/lab ul/TAI u Note estimation SYRTE-FO2 52699-52734 8.5 0.2 0.5 T183 0.7 0.9 1.3 (1) SYRTE-FOM 52704-52709 14.0 0.6 0.8 T184 2.0 6. 6.4 (2) SYRTE-FOM 52739-52744 21.6 0.8 0.8 T184 2.4 6. 6.6 (2) IEN-CSF1 52744-52754 17.2 1.3 2.0 [1] 0.4 3. 3.9 (3) PTB CS1 52759-52789 11.3 5. 8. T148 0. 1. 9. (4) PTB CS2 52759-52789 5.0 3. 12. T148 0. 1. 12. (4) [1] Levi F. et al., Proc. EFTF/FCS meeting, 2003, in press. Notes: (1) Report 27 May by BNM-SYRTE. (2) Report 12 June by BNM-SYRTE. (3) IEN atomic caesium fountain. Report 4 June by IEN. (4) Continuously operating as a clock participating to TAI. The second table gives the BIPM estimate of d, based on all available PFS measurements over the period MJD 52399-52789, 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 52759-52789 +9.8x10**-15 2.4x10**-15 5 - Relations of UTC and TAI with GPS time and GLONASS time. [UTC-GPS time] = -13 s + C0, [TAI-GPS time] = 19 s + C0, global uncertainty is of order 10 ns. [UTC-GLONASS time] = 0 s + C1, [TAI-GLONASS time] = 32 s + C1, global uncertainty is of order hundreds ns. The C0 values are obtained using the values [UTC-UTC(OP)] and the GPS data taken at the Paris Observatory, corrected for IGS precise orbits and ionosphere maps. The C1 vaules are obtained using the values [UTC-UTC(VSL)] and the GLONASS data taken at the NMi Van Swinden Laboratorium (VSL). The standard deviations S0 and S1 characterize the dispersion of individual measurements. N0 and N1 are the numbers of measurements. For this circular, S0 = 2.7 ns, S1 = 32.1 ns Date 2003 0h UTC MJD C0/ns N0 C1/ns N1 APR 30 52759 -4.2 44 213.9 67 MAY 1 52760 -3.0 43 162.3 64 MAY 2 52761 -6.3 43 135.1 69 MAY 3 52762 -9.0 43 117.9 77 MAY 4 52763 -11.1 44 104.1 77 MAY 5 52764 -11.3 41 112.3 51 MAY 6 52765 -10.6 44 108.3 69 MAY 7 52766 -9.7 45 113.0 69 MAY 8 52767 -9.7 44 118.8 78 MAY 9 52768 -8.6 44 121.8 75 MAY 10 52769 -5.9 45 124.3 66 MAY 11 52770 -5.0 44 128.3 63 MAY 12 52771 -4.9 45 120.2 57 MAY 13 52772 -3.5 45 114.5 81 MAY 14 52773 -0.5 39 129.1 29 MAY 15 52774 -3.6 43 149.8 71 MAY 16 52775 -6.7 45 142.5 67 MAY 17 52776 -6.9 43 182.8 60 MAY 18 52777 -7.2 45 178.5 65 MAY 19 52778 -10.8 45 112.3 66 MAY 20 52779 -16.2 44 107.9 70 MAY 21 52780 -12.2 45 138.2 77 MAY 22 52781 -10.8 44 149.4 38 MAY 23 52782 -12.6 44 150.0 71 MAY 24 52783 -14.1 45 165.6 51 MAY 25 52784 -12.9 45 167.7 47 MAY 26 52785 -10.1 45 140.1 76 MAY 27 52786 -8.8 38 130.4 42 MAY 28 52787 -6.9 44 140.9 73 MAY 29 52788 -9.1 42 136.2 83 MAY 30 52789 -9.5 42 131.6 66 6 - Time links used for the computation of TAI. The time links used in the elaboration of this Circular T are listed in this section. The type of link is indicated as follows: GPS SC for GPS common-view single-channel C/A data; GPS MC for GPS common-view multi-channel C/A data; GPS GT for 'GPS time' observations; INT LK for internal cable link and TWSTFT for two-way satellite time and frequency transfer data. Link Type Link Type AOS /NPL GPS MC NPL /PTB TWSTFT AUS /CRL GPS MC NPLI/PTB GPS SC BEV /NPL GPS MC NRC /USNO GPS SC BIRM/CRL GPS MC NTSC/CRL TWSTFT CAO /PTB GPS SC OMH /PTB GPS SC CH /PTB GPS SC ONBA/USNO GPS MC CNM /NIST GPS SC ONRJ/NIST GPS SC CRL /PTB GPS SC OP /PTB GPS SC CSIR/NPL GPS MC ORB /PTB GPS SC DLR /PTB GPS SC PL /NPL GPS MC DTAG/PTB GPS SC IEN /PTB TWSTFT ROA /PTB TWSTFT IFAG/PTB GPS SC SCL /CRL GPS SC IGMA/NIST GPS GT SG /CRL GPS MC INPL/PTB GPS SC SMU /PTB GPS SC IPQ /PTB GPS SC SP /PTB GPS SC JATC/NTSC INT LK SU /PTB GPS SC JV /PTB GPS GT TCC /NIST GPS SC KRIS/CRL GPS SC TL /CRL TWSTFT LDS /PTB GPS SC TP /PTB GPS SC LT /NPL GPS MC UME /PTB GPS SC MSL /CRL GPS MC USNO/PTB TWSTFT NAO /CRL GPS SC VSL /PTB TWSTFT NIM /CRL GPS SC NIMB/PTB GPS SC NIMT/CRL GPS MC NIST/PTB TWSTFT NMC /PTB GPS GT NMIJ/CRL TWSTFT NMLS/CRL GPS MC