CORE-B801 (Continuous Observations of the Rotation of the Earth-B801) 2000 January 12 Notes prepared by Cynthia Thomas and Nancy Vandenberg,NVI/GSFC Schedule name: CB801.SKD on CDDISA Nominal Start: 18:30 U.T. on January 12 (day 012) first observation at 18:30 U.T. on 1044+719 for KK-GN-NY-SH-SH-UR first observation at 18:30 U.T. on 0454-234 for NT-YB Nominal Stop: 18:30 U.T. on January 13 (day 013) last observation at 18:18 U.T. on 1741-038 for KK-GN last observation at 18:23 U.T. on 0552+398 for YB last observation at 18:27 U.T. on OJ287 for NT-NY-SH-UR Correlator: Haystack **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 Kokee K KK 1 (TT) 236 72983001 Noto S NT 2 (HDT) 216 75478901 NRAO 20M N GN 1 (TT) 257 72484701 Ny Alesund O NY 1 (TT) 232 73313301 Seshan C SH 3 (HDT) 193 72336101 Urumqi U UR 3 (HDT) 212 73303201 Yebes Y YB 2 (HDT) 186 73333601 Purpose ======= The purpose of the CORE-B sessions is to obtain EOP data on days adjacent to the main NEOS/CORE-A and CORE-3 sessions and thus extend the span of continuous data. The secondary purpose of CORE-B is to provide observing sessions during which the stations can demonstrate their performance and their ability to participate in future regular CORE sessions. The CORE-B networks are numbered 7 and 8 to distinguish them from the networks used in 1999. Schedule ======== This is a new schedule generated by C. Thomas with the automatic mode of sked. The characteristics of the CORE-B schedules have changed slightly. Changes were made to smooth out the distribution of observations over the sky. Following are the characteristics of the CORE-B schedule file: 1) This schedule was optimized for sky coverage. 2) Only the observations in the previous 2 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 the baselines were set to 20 for X-band and 15 for S-band, with the exception of the Yebes baselines. The minimum SNR limits for the Yebes baselines were set to 15 for X-bannd and 12 for S-band. 6) This schedule was made using 48 sources which helped improve the sky coverage. Simulation Results ================== Simulated data from this schedule was used in a global solution to estimate the formal errors. The table below lists the formal errors for Earth orientation parameters. These results meet the simulation goals for the CORE-B network. Also shown in the table are the maximum correlations between the Earth orientation parameters and other parameters. ____________________________________________ | | | | | | EOP |Formal| Other | | |Parameters |Errors|Parameters|Correlation| |____________|______|_________ |___________| | | | | | |X-Wobble | 76.64| UT1-TAI | 43% | | | | | | |Y-Wobble | 87.76| ------- | under 40% | | | | | | |UT1-TAI | 2.96| URUMQI X | 64% | | | | | | |UT1-TAI Rate| 4.42| ------- | under 40% | | | | | | ____________________________________________ 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 following databases: Date Experiment ==== ========== 99OCT04 CORE-B605 99OCT05 CORE-A072 99OCT05 NEOS-A336 99OCT11 EUROPE-51 99OCT12 NEOS-A337 99OCT19 NEOS-A338 99OCT26 NEOS-A339 99NOV02 CORE-A074 99NOV02 NEOS-A340 99NOV09 NEOS-A341 99NOV16 NEOS-A342 Procedures ========== Please generate the procedures for this session using drudg. Correlation ========== This experiment will be correlated at the Haystack Correlator with all baselines being correlated. SKED Summary from file ./cb801.skd for experiment CB801 (all scans with at least one subnet station) SOURCE |0 6 12 18 | #SCANS #OBS #Obs/bl 0003-066I x x x x x x x x x xx x x x x x I 16 24 3.0 0048-097I x I 1 1 .1 0059+581Ix x x x x x x x x I 9 115 6.6 0119+115Ix x x x x x x x x x x x x x xx xx x x xx x I 23 126 11.1 0119+041I x x x I 3 8 .8 0229+131I x x I 2 7 .6 0235+164I x x x x I 4 22 1.8 CTA26 I x x xx x x x x x x I 10 17 3.0 0402-362I x x x x x x x I 7 7 1.3 0454-234Ix x x x x x xx x x xx x x x x xx I 18 26 3.9 0458-020I x x xI 3 8 .9 0528+134Ixx x x xx x xx x xx x x x x xx x x xx x x x I 25 137 11.7 0552+398I x xx x x x x xx x x x x xx xx x x xx x x x x xI 26 253 17.7 0556+238I x x I 2 2 .2 0727-115I x x x xx x x x xx x x xx x x x xx x x x I 22 47 6.2 0749+540Ix x x x x x x x x I 9 83 5.1 0804+499I x x x I 3 31 1.8 0805+410I x xI 2 6 .5 0823+033I x x x x x x x xx x x x x xI 14 45 4.6 OJ287 I x x x x x xx x x x xx x x x I 15 86 6.8 4C39.25 I x xx xx x x x x x x x x x x x x xx x xI 21 193 13.6 0955+476I x x x I 3 35 2.3 1034-293I x x x I 3 3 .5 1044+719I x x x x x x x x x x x I 11 151 7.5 1053+815I x I 1 3 .1 1124-186I x x xx xx x x x x x xx x x x x x xI 19 33 4.7 1128+385I I 0 0 .0 1144-379I x x I 2 2 .3 1219+044I x x x x xx x xx I 9 24 2.4 1255-316I x x x x x xI 6 6 1.0 1300+580I I 0 0 .0 1313-333I I 0 0 .0 1334-127I x x x x x x x x x x xx x x I 14 20 2.7 1351-018I x I 1 6 1.1 1357+769I x x x x x x x I 7 147 7.0 1606+106Ix xx x x xx x x x xx xxx x x x xx I 20 101 9.1 1622-253I x x x x x xx x x x x x I 12 14 2.1 NRAO512 Ix x x x xx x xx x x x x x xx x x x x x I 21 207 14.4 1739+522I x I 1 6 .4 1741-038I x x x x xx x xx xx x x xx x x xx x xx x xI 24 54 7.2 1749+096I x x x x x xx xI 8 39 3.6 1908-201I I 0 0 .0 1921-293I I 0 0 .0 1954-388I x x x x x x x x I 8 8 1.5 1958-179I I 0 0 .0 2121+053I x x x x x x x x x x xx xx x x x x x x x I 21 94 9.4 2145+067I x x x x x x I 6 17 1.7 2234+282I x x x x x x x x x xx xx I 13 64 4.8 Total scans, obs: 445 2278 Average number of obs. per baseline per source (normalized by up-time) = 4.0 Min = .0 Max = 36.5 (Baseline Ny-Yb on 1741-038) RMS = 5.7 Total time: 1439 minutes ( 24.0 hours). Key: Kk=KOKEE Nt=NOTO Gn=NRAO20 Ny=NYALES20 Sh=SESHAN25 Ur=URUMQI Yb=YEBES Kk Nt Gn Ny Sh Ur Yb Avg % obs. time: 34 28 38 31 34 35 32 33 % cal. time: 2 2 2 2 2 2 2 2 % slew time: 14 34 15 14 40 24 20 23 % idle time: 48 34 43 51 22 37 44 40 # of tapes : .6 1.8 .7 .5 2.1 2.2 2.0 total # scans: 236 216 257 232 193 212 186 218 # scans/hour : 9 9 10 9 8 8 7 9.1 Avg scan (sec): 124 115 127 117 153 145 148 132 # OF OBSERVATIONS BY BASELINE | Kk Nt Gn Ny Sh Ur Yb StnTotal ------------------------------------------ Kk|236 33 155 107 123 92 25 535 Nt| 216 123 155 73 125 176 685 Gn| 257 153 55 76 119 681 Ny| 232 116 154 129 814 Sh| 193 157 45 569 Ur| 212 87 691 Yb| 186 581 Number of 2-station scans: 156 Number of 3-station scans: 84 Number of 4-station scans: 97 Number of 5-station scans: 76 Number of 6-station scans: 24 Number of 7-station scans: 8 Total # of scans, observations: 445 2278 Average baseline components for all observations Average XY = 5914. Average XZ = 4210. Average YZ = 4351. Average length = 6178.