CORE-B311 (Continuous Observations of the Rotation of the Earth-B311) 1998 October 21 Notes prepared by Cynthia Thomas, NVI/GSFC Schedule name: CB311.SKD on CDDIS Nominal Start: 18:30 U.T. on October 21 (day 294) first observation at 18:30 U.T. on 1044+719 Duration: 24 hours Nominal Stop: 18:30 U.T. on October 22 (day 295) last observation at 18:27 U.T. on 1606+106 for NT last observation at 18:31 U.T. on 4C39.25 for GC-KK-GN -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 Fairbanks A GC 1 (TT) 267 40476601 Kokee K KK 1 (TT) 229 72983001 Noto S NT 2 (HDT) 175 75478901 NRAO 20M N GN 1 (TT) 241 72484701 Seshan C SH 2 (HDT) 186 72336101 Urumqi U UR 2 (HDT) 203 73303201 Purpose ======= The purpose of the CORE-B sessions is to provide additional data for comparison of EOP measurements and to obtain long 48-hour data sets for geophysical studies. The analysis of CORE-A and CORE-B has concentrated on comparing the EOP results from these sessions with the NEOS sessions. Preliminary results of the comparisons show that, while the EOP results generally agree between different networks, there are systematic differences that are not fully understood. Because of these discrepancies, it was decided that an improved comparison could be made if the CORE-A, NEOS, and CORE-B could all be compared for the same day, making possible a 3-way comparison. Therefore we will run the CORE-B sessions on days adjacent to the CORE-A/NEOS days instead of on the alternate week. This plan will concentrate the observing days but it will provide more a robust data set for understanding the differences. 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 60% 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 twenty 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 43 sources which helped improve the sky coverage. Station Information =================== Yebes will not participate in this experiment because of formatter problems. 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 98Mar03 NEOS-A253 and the 98JAN27XA CORE-A028 experiments. 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 ./cb311.skd for experiment CB311 (all scans with at least one subnet station) SOURCE |0 6 12 18 | #SCANS #OBS #Obs/bl 0003-066I xx xx x x I 6 16 2.9 0048-097Ix x x x x x x I 7 20 3.8 0059+581I x x x x x x x x xx x x x xx x x x I 18 207 15.8 0119+041I x xx x x I 5 13 1.8 0229+131Ix x x x x I 5 16 1.9 CTA26 I x I 1 1 .2 0454-234I x x x xx x x x x x xI 11 17 4.5 0458-020I x x x x xxx x xx x I 11 32 5.1 0528+134I x x x x xx x xx xx x x xx x xx x x I 20 76 9.2 0552+398Ix x xx x x x x x x x x xx x x x x xx xx xx xI 25 164 15.0 0718+793I I 0 0 .0 0727-115Ix x x x x x x xx x x xx I 13 29 6.4 0804+499I x x x x x x x x x x x x x x x x x x x I 19 162 13.6 0823+033Ix x x x x x x x x x I 10 24 3.4 OJ287 I I 0 0 .0 0919-260I I 0 0 .0 4C39.25 I x x x x x x x x xx x x x x x x x x xI 20 131 12.1 OK290 I x x I 2 2 .2 0955+476I x x x I 3 26 2.2 1034-293I I 0 0 .0 1044+719I x x x x x x x x x x x x I 12 175 12.1 1124-186I x x I 2 2 .5 1128+385I x x x I 3 9 .8 1219+044Ix x x x x x x xx xxx x I 14 45 6.2 1255-316I I 0 0 .0 1300+580I x x x x I 4 12 .9 1308+326I x x x x x x xI 7 15 1.4 1334-127I I 0 0 .0 1351-018I I 0 0 .0 1357+769I x x x x x x x I 7 105 7.0 1606+106I x x xx xx x x x xx x x xxx xI 17 65 8.2 1622-253I x x x x x I 5 5 1.4 NRAO512 Ix x x xx x xx xx x x x x x x x x xx x xx xxI 25 169 15.5 1739+522I x x x x x x x x x x x x x x x x x xI 18 178 14.7 1741-038I xx x xx x x x x x x xx x x xxI 17 51 8.3 1749+096I x x x x x x x x x I 9 31 4.0 1921-293Ix x x xx x xx x I 9 11 3.1 1954-388I x x I 2 2 .6 1958-179Ix x x x I 4 4 .9 2128-123I x x xx x x x x x x I 10 16 3.6 2145+067I x x xx xx xx x x x x x x x x x x xI 19 57 7.6 2234+282I x x x xx x I 6 18 1.7 2255-282I x I 1 1 .3 Total scans, obs: 367 1907 Average number of obs. per baseline per source (normalized by up-time) = 4.9 Min = .0 Max = 29.8 (Baseline Gc-Kk on 1741-038) RMS = 6.2 Total time: 1442 minutes ( 24.0 hours). Key: Gc=GILCREEK Kk=KOKEE Nt=NOTO Gn=NRAO20 Sh=SESHAN25 Ur=URUMQI Gc Kk Nt Gn Sh Ur Avg % obs. time: 29 33 22 33 31 29 29 % cal. time: 3 2 2 2 2 2 2 % slew time: 22 14 26 15 41 25 24 % idle time: 45 49 49 49 25 41 43 # of tapes : .5 .6 1.4 .6 1.9 1.8 total # scans: 267 229 175 241 186 203 216 # scans/hour : 11 9 7 10 7 8 9.0 Avg scan (sec): 95 127 110 119 144 127 120 # OF OBSERVATIONS BY BASELINE | Gc Kk Nt Gn Sh Ur StnTotal -------------------------------------- Gc|267 205 114 198 133 142 705 Kk| 229 58 162 116 105 787 Nt| 175 121 91 126 550 Gn| 241 75 94 548 Sh| 186 167 671 Ur| 203 553 Number of 2-station scans: 71 Number of 3-station scans: 133 Number of 4-station scans: 82 Number of 5-station scans: 54 Number of 6-station scans: 27 Total # of scans, observations: 367 1907 Average baseline components for all observations Average XY = 6488. Average XZ = 4527. Average YZ = 4815. Average length = 6786.