CIRCULAR T 192 ISSN 1143-1393 2004 JANUARY 13, 15h UTC BUREAU INTERNATIONAL DES POIDS ET MESURES ORGANISATION INTERGOUVERNEMENTALE 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 NOV 26 DEC 1 DEC 6 DEC 11 DEC 16 DEC 21 DEC 26 DEC 31 MJD 52969 52974 52979 52984 52989 52994 52999 53004 Laboratory k [UTC-UTC(k)]/ns AOS (Borowiec) 22.5 16.0 6.5 -1.9 -3.8 -3.3 -2.0 0.3 APL (Laurel) - - - - -377.4 -352.5 -329.2 -309.5 (1) AUS (Sydney) -417.5 -396.8 -402.6 -402.4 -413.4 -423.3 -418.0 -428.0 BEV (Wien) 5.0 7.0 5.0 5.8 8.6 7.1 1.5 9.2 BIRM (Beijing) 1480.8 1501.0 1516.0 1524.4 1543.6 1558.9 1580.7 1596.1 CAO (Cagliari) -4267.7 -4268.6 -4251.2 -4240.8 -4223.3 -4228.7 -4213.2 -4196.5 CH (Bern) 30.6 33.1 37.7 39.8 39.3 30.5 25.3 25.1 CNM (Queretaro) -7.3 2.4 10.9 10.0 28.7 33.5 42.4 44.3 CNMP (Panama) -1523.7 -1577.9 -1637.2 -1690.2 -1762.1 -1823.0 -1865.9 -1912.4 CRL (Tokyo) -2.3 -6.8 -3.1 -5.1 -3.3 -6.7 -9.0 -4.3 CSIR (Pretoria) 3915.1 3824.6 3753.4 3697.1 3634.2 3546.9 3494.7 3397.2 DLR (Oberpfaffenhofen) 4.9 4.8 0.9 1.4 2.4 2.4 13.9 16.6 DTAG (Darmstadt) 222.0 230.6 216.8 212.1 223.4 233.3 229.1 230.8 IEN (Torino) 1.9 0.7 1.6 -2.0 -14.3 -24.2 -41.6 -45.3 IFAG (Wettzell) -2470.4 -2481.7 -2502.4 -2518.9 -2528.5 -2548.5 -2566.9 -2579.0 IGMA (Buenos Aires) -85.2 -82.5 -78.1 -82.1 -84.4 -83.3 -82.3 -82.2 INPL (Jerusalem) -9028.8 -9047.1 -9073.2 -9092.4 -9121.3 -9137.5 -9168.1 -9186.7 IPQ (Monte de Caparica) - - - - - - - - JATC (Lintong) -11152.4 -11151.9 -11148.2 -11134.1 -11135.1 -11125.4 -11123.2 -11116.0 JV (Kjeller) -10333.0 -10279.6 -10235.1 -10195.2 -10147.6 -10143.9 -10088.6 -10055.9 KRIS (Daejon) 7.1 1.7 12.3 8.2 9.5 -0.3 1.1 3.1 LDS (Leeds) 4425.2 4467.2 4499.9 4540.4 4590.8 4608.2 4639.1 4671.1 LT (Vilnius) 94.6 96.6 102.0 111.3 138.9 144.2 150.4 146.3 MSL (Lower Hutt) -97.1 -116.3 -118.4 -146.5 -146.4 -160.0 -163.4 -126.4 NAO (Mizusawa) -8.1 -1.3 43.3 51.8 55.3 72.3 56.0 40.6 (2) NIM (Beijing) -2641.4 -2643.2 -2638.8 -2638.5 -2625.8 -2636.3 -2635.9 -2637.0 NIMB (Bucharest) -346.9 -340.5 -328.5 -331.2 -343.1 -349.3 -340.3 -346.2 NIMT (Bangkok) -647.2 -668.9 -686.4 -696.9 -718.2 -739.6 -760.4 -776.4 NIST (Boulder) -1.1 -0.7 -0.2 -1.6 -2.8 -4.1 -4.0 -3.7 NMC (Sofiya) -3277.8 -3289.7 -3341.9 -3353.2 -3348.0 -3383.6 -3406.2 -3455.1 NMIJ (Tsukuba) 65.2 59.4 57.9 54.5 57.4 65.3 63.3 75.2 NMLS (Shah Alam) 362.1 357.6 362.2 265.6 292.5 292.1 304.7 314.4 NPL (Teddington) 54.6 54.3 55.3 52.2 51.7 50.5 50.2 50.7 NPLI (New-Delhi) - 6090.1 6107.3 6156.3 6200.5 6237.2 6269.8 6311.5 NRC (Ottawa) 36.3 41.6 46.7 45.6 48.8 55.6 53.6 50.4 NTSC (Lintong) 11.4 9.0 21.2 28.2 29.5 34.4 34.5 39.1 OMH (Budapest) 8650.4 8666.0 8682.6 8698.4 8717.2 8729.0 8736.6 8776.6 ONBA (Buenos Aires) -1571.5 -1802.3 -1921.0 -1923.6 -2014.5 -2073.6 -2263.3 -2410.9 ONRJ (Rio de Janeiro) 5864.1 - 6125.6 6082.3 6053.2 6010.7 5976.8 5940.8 (3) OP (Paris) 45.8 51.9 48.2 39.7 36.8 37.1 31.7 33.6 ORB (Bruxelles) -13.4 -13.2 -14.9 -16.9 -18.7 -23.2 -25.8 -28.4 PL (Warszawa) 33.1 17.2 3.1 -3.3 -2.0 -2.4 -14.9 -22.0 PTB (Braunschweig) 0.0 0.8 -0.7 -4.1 -6.9 -7.2 -2.5 -2.4 ROA (San Fernando) 79.6 89.8 91.9 80.5 72.4 61.1 51.5 43.3 SCL (Hong Kong) -62.6 -67.0 -70.7 -65.4 -63.3 -58.6 -61.5 -59.4 SG (Singapore) 57.9 60.4 58.6 58.4 54.6 60.1 71.1 79.0 SMU (Bratislava) -9130.6 -9143.6 -9158.1 -9171.9 -9202.6 -9239.1 -9271.8 -9278.2 SP (Boras) 76.8 83.7 91.8 99.5 106.2 110.2 108.0 125.8 SU (Moskva) -14.2 -13.7 -15.3 -18.9 -18.7 -23.8 -25.2 -26.4 TCC (Concepcion) -5233.0 -5279.9 -5325.8 -5365.7 -5427.5 -5471.5 -5523.5 -5570.6 TL (Chung-Li) 0.7 0.9 2.3 5.1 6.2 11.6 10.0 10.8 TP (Praha) 47.8 48.5 43.0 29.5 20.8 17.5 18.0 16.0 UME (Gebze-Kocaeli) 52.7 53.5 74.6 84.6 86.6 89.7 90.1 99.4 USNO (Washington DC) 4.8 5.8 8.3 8.1 6.2 7.0 7.4 8.5 VSL (Delft) -21.7 -25.7 -28.6 -27.2 -30.2 -33.7 -36.4 -35.2 - Notes on section 1: (1) APL : Applied Physics Laboratory, Laurel, MA, USA. (2) NAO : Time step of UTC(NAO) of -50 ns on MJD = 52978.38 due to change of master clock. (3) ONRJ: Change of master clock on MJD = 52978 2 - International Atomic Time TAI and Local atomic time scales TA(k). Computed values of [TAI-TA(k)]. Date 2003 0h UTC NOV 26 DEC 1 DEC 6 DEC 11 DEC 16 DEC 21 DEC 26 DEC 31 MJD 52969 52974 52979 52984 52989 52994 52999 53004 Laboratory k [TAI-TA(k)]/ns CH (Bern) 38578.8 38730.5 38884.3 39035.7 39185.5 39331.1 39480.4 39634.6 CRL (Tokyo) 180638.5 180838.6 181041.3 181241.5 181445.2 181642.7 181844.8 182049.7 F (Paris) 169342.4 169346.7 169346.0 169350.9 169356.4 169356.8 169359.4 169361.8 IEN (Torino) 31854.1 31984.6 32114.6 32217.0 32337.4 32466.3 32594.3 32720.1 JATC (Lintong) -33699.4 -33793.9 -33874.2 -33952.1 -34055.1 -34141.4 -34245.2 -34339.0 KRIS (Taejon) 6397.7 6422.8 6454.4 6477.6 6506.2 6523.7 6551.5 6578.5 NIST (Boulder) -45257320.2 -45257516.8 -45257713.3 -45257911.7 -45258109.9 -45258308.2 -45258505.5 -45258702.7 NRC (Ottawa) 28706.1 28715.8 28725.8 28728.9 28736.5 28747.6 28748.9 28750.0 NTSC (Lintong) 323.1 325.5 335.1 350.7 354.8 366.9 373.5 385.7 PL (Warszawa) -1888.9 -1909.8 -1924.9 -1941.3 -1952.0 -1962.4 -1980.9 -1996.0 PTB (Braunschweig) -359310.5 -359304.3 -359301.0 -359299.2 -359297.1 -359292.1 -359282.4 -359277.3 SU (Moskva) 27240985.8 27240986.3 27240984.7 27240981.1 27240981.3 27240976.2 27240974.8 27240973.6 (1) USNO (Washington DC) -34921098.9 -34921406.2 -34921712.7 -34922021.0 -34922330.9 -34922638.1 -34922945.6 -34923253.0 - 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) Steering correction 52969 - 53034 6.940x10**-13 (2003 NOV 26 - 2004 JAN 30) New correction foreseen 53034 - 53064 6.930x10**-13 (2004 JAN 30 - 2004 FEB 29) 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 RefB uLab uTai u Note Estimation SYRTE-FO2 52824 52829 7.3 0.6 0.5 T183 0.1 6.0 6.1 (1) SYRTE-FOM 52824 52829 4.8 0.3 0.8 T183 0.1 6.0 6.1 (1) SYRTE-FO2 52884 52909 7.9 0.1 0.6 T183 0.3 1.2 1.4 (1) SYRTE-JPO 52974 52984 22.0 0.7 6.5 T160 0.3 3.0 7.2 (2) SYRTE-JPO 52989 53004 19.2 0.5 6.5 T160 0.3 2.0 6.8 (2) NIST-F1 52969 52999 9.4 0.5 0.4 T182 0.2 1.0 1.2 (3) PTB-CS1 52969 53004 0.9 5.0 8.0 T148 0.0 1.0 9.5 (4) PTB-CS2 52969 53004 6.2 3.0 12.0 T148 0.0 1.0 12.4 (4) Notes: (1) Report 22 Dec. 2003 by BNM-SYRTE. (2) Report 8 Jan. 2004 by BNM-SYRTE. (3) Report 29 Dec. 2003 by NIST. (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 52609-53004, 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 52969-53004 9.7x10**-15 1.1x10**-15 (2003 NOV 26 - 2003 DEC 31) 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 values 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 = 2.6 ns, S1 = 26.0 ns Date 2003 0h UTC MJD C0/ns N0 C1/ns N1 NOV 26 52969 -1.0 39 97.9 66 NOV 27 52970 -3.8 42 99.5 60 NOV 28 52971 -1.1 42 94.6 68 NOV 29 52972 0.9 44 101.5 63 NOV 30 52973 1.7 44 105.6 68 DEC 1 52974 1.7 44 103.5 62 DEC 2 52975 -1.4 41 118.5 59 DEC 3 52976 -0.5 41 124.5 56 DEC 4 52977 3.0 42 112.7 51 DEC 5 52978 6.4 43 115.7 61 DEC 6 52979 5.1 45 133.0 21 DEC 7 52980 4.6 44 139.6 0 DEC 8 52981 2.2 44 148.7 18 DEC 9 52982 1.8 42 133.8 34 DEC 10 52983 4.9 45 129.1 51 DEC 11 52984 3.8 44 140.7 60 DEC 12 52985 4.5 43 136.3 63 DEC 13 52986 2.5 43 149.1 71 DEC 14 52987 1.0 44 160.5 62 DEC 15 52988 0.2 44 164.6 70 DEC 16 52989 1.3 43 159.6 65 DEC 17 52990 2.5 41 169.0 55 DEC 18 52991 2.6 36 170.3 63 DEC 19 52992 2.0 40 160.8 46 DEC 20 52993 1.2 41 157.9 61 DEC 21 52994 -1.0 41 157.4 68 DEC 22 52995 -0.6 40 156.6 65 DEC 23 52996 1.4 44 173.4 68 DEC 24 52997 2.9 44 181.2 59 DEC 25 52998 2.8 43 171.6 58 DEC 26 52999 2.1 45 170.3 53 DEC 27 53000 5.1 43 174.5 46 DEC 28 53001 3.9 43 166.0 61 DEC 29 53002 3.9 44 164.4 63 DEC 30 53003 3.1 45 182.8 55 DEC 31 53004 2.1 44 185.4 73 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 P3 for GPS common-view multi-channel dual-frequency P code 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 /PTB GPS MC NMIJ/CRL TWSTFT APL /USNO GPS MC NMLS/CRL GPS MC AUS /CRL GPS MC NPL /PTB TWSTFT BEV /PTB GPS MC NPLI/PTB GPS SC BIRM/CRL GPS MC NRC /USNO GPS SC CAO /PTB GPS SC NTSC/CRL TWSTFT CH /PTB GPS SC OMH /PTB GPS SC CNM /NIST GPS SC ONBA/USNO GPS MC CNMP/USNO GPS MC ONRJ/NIST GPS SC CRL /PTB GPS MC OP /PTB GPS SC CSIR/PTB GPS MC ORB /PTB GPS P3 DLR /PTB GPS P3 PL /PTB GPS MC DTAG/PTB GPS SC ROA /PTB TWSTFT IEN /PTB TWSTFT SCL /CRL GPS SC IFAG/PTB GPS P3 SG /CRL GPS MC IGMA/NIST GPS GT SMU /PTB GPS SC INPL/PTB GPS SC SP /PTB GPS SC IPQ /PTB - SU /PTB GPS SC JATC/NTSC INT LK TCC /NIST GPS SC JV /PTB GPS GT TL /CRL TWSTFT KRIS/CRL GPS MC TP /PTB GPS SC LDS /PTB GPS SC UME /PTB GPS SC LT /PTB GPS MC USNO/PTB TWSTFT MSL /CRL GPS MC VSL /PTB TWSTFT NAO /CRL GPS SC NIM /CRL GPS SC NIMB/PTB GPS SC NIMT/CRL GPS MC NIST/PTB TWSTFT NMC /PTB GPS GT