APSG-4 (Asian Pacific Space Geodesy-4) 1998 November 12 Notes prepared by Dr. Qian Zhihan, Shanghai Observatory Cynthia Thomas, NVI/GSFC Schedule name: APSG4.SKD on CDDISA Nominal Start: 23:00 U.T. on November 12 (day 316) first observation at 23:00 U.T. on 1308-326 for GC-HO-KK-TS first observation at 23:00 U.T. on 4C39.25 for SH-UR Duration: 24 hours Nominal Stop: 23:00 U.T. on November 13 (day 317) last observation at 22:53 U.T. on 0727-115 for HO-UR last observation at 22:54 U.T. on 0749+540 for SH last observation at 22:56 U.T. on 0718+793 for GC-KK-TS Correlator: Washington **Frequency Sequence**: CDPSX - Standard CDP SX sequence. (360 MHz wide at X, 85 MHz wide at S) 1 letter 2 letter Station Code Code # of tapes # of obs Occupation Code Fairbanks A GC 1 (TT) 368 40476601 Hobart H HO 3 (HDT) 248 72425901 Kokee K KK 1 (TT) 392 72983001 Seshan D SH 3 (HDT) 292 72336101 Tsukuba T TS 1 (TT) 389 73452301 Urumqi U UR 3 (HDT) 295 73303201 Purpose ======= This is second of the second group of two Asian Pacific Space Geodesy (APSG) experiments. The primary purpose of these APSG sessions is to continue monitoring the relative motions of the plates in the Asia-Pacific region. These sessions involve sites on the four plates. Tsukuba and Fairbanks are on the North American Plate, Hobart is on the Australian Plate, Seshan and Urumqi are on the Eurasian Plate, and Kokee is on the Pacific Plate. Thus, these sessions will produce critical data for the investigation of the current crustal motions in the Asia-Pacific region combined with the data from the APSG SLR and GPS campaigns which will also be performed in November 1998. Also, these experiments will improve the accuracy of the geocentric coordinates of the participating stations, especially Urumqi and Tuskuba. Station Information =================== Tsukuba, the new Japanese station operated by GSI, will replace Kashima in this network. Kashima participated in the first two APSG experiments but Tsukuba is more sensitive and will make the APSG network more robust. Schedule ======== This is a new schedule generated by C. Thomas with the automatic mode of sked. The following are the characteristics of the schedule: 1) This schedule was optimized for sky coverage. 2) Only the observations in the previous two hours of the schedule were considered for the minor options. The best 50% of the configurations were considered for minor options. 3) The "minor options" were set to select observations to maximize the total number of observations, to minimize the idle time between scans, and to minimize time between scans on the same source by thirty minutes. 5) The minimum SNR limits for most baselines were set to 20 for X-band and 15 for S-band. 6) This schedule was made using 64 sources which helped improve the sky coverage. Flux Information ================ Several years ago John Gipson wrote a program called snranal which compares the measured performance of an experiment with respect to the predicted. One of the things this program calculates is an empirical flux density for each source. Recently J. Gipson compared the fluxes generated by this program with those from more careful modeling. The agreement is generally good (~15%) for those sources which have been observed more than 20 times. In order to account for changes in the flux catalog since the last update, J. Gipson adjusted the fluxes in the flux catalog for the sources in the current source catalog using the 98AUG11 CORE-A042, 98AUG17 EURO44, and 98AUG25 experiments. Procedures ========== Please generate the procedures for this session using drudg. Correlation =========== This experiment will be correlated at the Washington Correlator with all baselines being correlated. SKED Summary from file ./apsg4.skd for experiment APSG4 (all scans with at least one subnet station) SOURCE |0 6 12 18 | #SCANS #OBS #Obs/bl 0003-066I xx x x xx x xx xx I 11 19 3.5 0048-097I x x x x xx x xx x x x I 12 51 8.4 0059+581Ix x x xxx xx x xx x xx x x x x x xx x xx I 24 112 11.9 0104-408I x xx x xx x xx x xxx xx x I 16 24 4.4 0119+115I x x x x xx x x x x x xx I 13 74 10.2 0119+041I xx x xx x x x x x I 10 16 2.3 0208-512I xx x x x xx x I 8 8 1.1 0229+131I x x x x x x x x I 8 13 1.8 0235+164I x I 1 1 .1 CTA26 I xx x x x xxx x x x x x I 13 23 3.6 0402-362I x x x x xxx xx x x x x x I 14 30 5.9 0454-234I x x xx xx xx x x x xx xxx I 16 45 9.3 0458-020I x x x x x x x x xx x I 11 15 2.4 0528+134Ix xxx xx x xxxx x x x x x x xxx xx I 22 110 15.0 0537-441I x x x x x I 5 7 1.1 0552+398Ix x x x x x xx xx xxx xx xx xxx x xx x xxI 26 98 12.0 0556+238I x x xx x x x xx I 9 16 1.9 0718+793I x x x x x x x x x x x x xx I 14 28 2.5 0727-115Ixx xx xx x x x xx x xxx I 15 67 13.2 0749+540I x x x x x x xx xx x x x x x x x x x x xI 21 86 9.4 0804+499I x x x x xx x x x x x x I 12 39 4.5 0805+410I x x x x I 4 13 1.5 0823+033Ix xx x x x x xx x x xI 12 26 3.6 OJ287 Ix x x x I 4 4 .5 0919-260I x x x x I 4 6 1.6 0920-397Ix x x x I 4 4 1.4 4C39.25 Ix x xx x x x x x x x xx x x xx x xx x I 21 79 14.6 OK290 I xx x x x x x x x x x x x x xI 15 33 3.4 0955+476I x xx x x xx x xx x x x x I 14 40 4.4 1034-293Ix x x xx xx x x xI 10 26 5.3 1044+719I x x x x x x x x x x x x x x x xI 16 89 8.3 1053+815I x x x x x I 5 5 .5 1104-445I x x x I 3 3 1.0 1124-186Ix xx x x xx x x x I 10 29 5.9 1128+385I x x x x x x x I 7 21 1.8 1144-379I x xx x x x x xx xxI 11 24 4.8 1219+044Ixx x x x x x xx x I 10 16 2.2 1255-316I x x x x I 4 4 .7 1300+580I x x xx x x x x x x x x x I 13 23 2.3 1308+326I x x x x x x x xx x x x xxxI 15 51 6.9 1313-333I x x xx xx xI 7 7 1.2 1334-127Ix x x xx xx I 7 9 4.2 1351-018I x x x x x xI 6 8 1.3 1357+769I x x xx x x x x x x x xI 12 67 6.1 1424-418I x x x x x xx xx x I 10 14 2.6 1451-375I x x x x x I 5 9 1.9 1606+106Ix x xx x xx x xxx xx I 13 34 4.6 1622-253Ix x x x xx I 6 8 1.9 NRAO512 I x xx x x x x x x x xxx xxx x x x xxx x xI 24 87 10.8 1726+455I x x x x x x x x x x I 10 16 1.7 1739+522Ix x x xx xx x x x x x x x x x x x x x xx I 22 90 10.1 1741-038Ixx x xx xx xx xxx xx x x I 16 93 14.9 1749+096I x x xx x x xx x xx x I 12 37 5.0 1908-201I x xx x xx x I 7 11 2.7 1921-293I xx xxx xx x x x x x x x xI 15 27 5.3 1954-388I x x x xx x xxx x xx x x xxI 16 25 4.8 1958-179Ix xxx x x x x x x x I 11 27 5.6 2005-489I x I 1 1 .1 2052-474I xx I 2 2 .3 2121+053Ixx x x x x x x x x x x x I 13 55 7.8 2128-123I xx xx x x x x I 8 12 3.4 2145+067I x xx x xx x x x xx I 11 43 6.0 2234+282Ixx x x xxx x x x xx x x x I 15 19 1.9 2255-282I x x x x x x x I 7 7 2.0 Total scans, obs: 719 2086 Average number of obs. per baseline per source (normalized by up-time) = 4.9 Min = .0 Max = 38.6 (Baseline Gc-Kk on 1334-127) RMS = 5.8 Total time: 1438 minutes ( 24.0 hours). Key: Gc=GILCREEK Ho=HOBART26 Kk=KOKEE Sh=SESHAN25 Ts=TSUKUB32 Ur=URUMQI Gc Ho Kk Sh Ts Ur Avg % obs. time: 45 36 45 40 37 41 41 % cal. time: 4 2 4 3 4 3 3 % slew time: 21 30 18 41 12 27 25 % idle time: 28 30 31 14 45 27 29 # of tapes : .8 2.2 .8 2.5 .7 2.5 total # scans: 368 248 392 292 389 295 330 # scans/hour : 15 10 16 12 16 12 13.8 Avg scan (sec): 105 125 99 120 83 121 108 # OF OBSERVATIONS BY BASELINE | Gc Ho Kk Sh Ts Ur StnTotal -------------------------------------- Gc|368 36 261 111 190 143 777 Ho| 248 130 113 134 65 492 Kk| 392 84 177 68 752 Sh| 292 185 209 756 Ts| 389 180 576 Ur| 295 819 Number of 2-station scans: 381 Number of 3-station scans: 185 Number of 4-station scans: 110 Number of 5-station scans: 31 Number of 6-station scans: 12 Total # of scans, observations: 719 2086 Average baseline components for all observations Average XY = 4255. Average XZ = 4285. Average YZ = 4931. Average length = 5812.