CORE-B312 (Continuous Observations of the Rotation of the Earth-B312) 1998 December 28 Notes prepared by Cynthia Thomas, NVI/GSFC Schedule name: CB312.SKD on CDDIS Nominal Start: 16:00 U.T. on December 28 (day 362) first observation at 16:00 U.T. on 0804+499 for KK-NT-GN- SH-UR first observation at 19:45 U.T. on 0048-097 for 65 Duration: 24 hours Nominal Stop: 16:00 U.T. on December 29 (day 363) last observation at 15:49 U.T. on 4C39.25 for KK last observation at 15:53 U.T. on 0059+581 for 65-NT-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 DSS65 M 65 1 (TT) 233 16658501 Kokee K KK 1 (TT) 219 72983001 Noto S NT 2 (HDT) 246 75478901 NRAO 20M N GN 1 (TT) 270 72484701 Seshan C SH 2 (HDT) 203 72336101 Urumqi U UR 2 (HDT) 236 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. Fairbanks will not participate in this experiment because of staffing 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 98AUG17 (EUROPE-44), 98AUG18 (NA277), 98AUG25 (CORE-A043 and NA278), 98AUG26 (CB111), 98SEP01 (NA279), and 98SEP22 (CA045). 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 ./cb312.skd for experiment CB312 (all scans with at least one subnet station) SOURCE |0 6 12 18 | #SCANS #OBS #Obs/bl 0003-066I x xxx x x xx x x x x xI 13 19 2.9 0048-097I x x I 2 4 .6 0059+581Ix x x x x x x x x x x x x xx x x x x x I 20 216 17.2 0119+041I xx x x x x xx I 8 14 2.0 0229+131I x I 1 1 .1 CTA26 I x x xI 3 3 .4 0454-234Ix x x x x x xx x x x x x x x xx I 17 27 4.9 0458-020I x x xx xx x xx x I 10 20 3.0 0528+134Ixx x xx x xx x x xx x x xx x x xx x I 21 66 8.6 0552+398I xx xx x x x x x x x xx x x x x x xx xx xxI 24 123 13.0 0718+793I x x x x x xI 6 6 .4 0727-115I x x xx x x x x x x x xx x x x x xx x xI 21 49 7.9 0804+499I x x x x x x x x x x x x x x xx x x x x x xI 22 164 15.4 0823+033I x x x x x x x x x I 9 25 3.5 OJ287 Ix x x x x I 5 5 .6 0919-260I x I 1 1 .2 4C39.25 Ix x x xx x x xx xx xx x xx x x x x x x x I 23 131 13.9 OK290 I x x x I 3 3 .3 0955+476I x x xI 3 22 2.1 1034-293I x x x I 3 3 .7 1044+719I x x x x x x x x x xx x I 12 165 11.4 1124-186I xx x x x x xx x xx x I 12 27 4.8 1128+385I x x x I 3 15 1.6 1219+044I x x x I 3 7 1.0 1255-316I x x I 2 2 .5 1300+580I x I 1 1 .1 1308+326I x x x I 3 3 .3 1334-127I x x xx x x x x x x x x I 12 29 4.8 1351-018I x I 1 3 .5 1357+769Ix x x x x x x x x x I 10 140 9.3 1606+106I x x x x xx I 6 14 1.9 1622-253I x x xx x x xx x x x x I 12 18 3.6 NRAO512 Ix x xx x x x x xx x x x x x xx x x x x xx x xx I 26 152 16.0 1739+522I x x x x xx x x x x x x x x xx x x x x xx I 22 181 16.4 1741-038I x x x x x xx x x x x x x x xx x x xxI 20 52 7.8 1749+096I x xx x x xx x xxx x x x x x x xxI 19 67 9.0 1921-293I I 0 0 .0 1954-388I x x x x x x x x x x I 10 10 2.6 1958-179I x x x x x x x x x x x xx I 13 26 4.5 2128-123I x x xx x I 5 7 1.1 2145+067I x x x x x x x x xx x x x x x x xxI 18 43 5.9 2234+282Ix x x x x x I 6 15 1.8 2255-282I x x x I 3 3 .6 Total scans, obs: 434 1882 Average number of obs. per baseline per source (normalized by up-time) = 4.7 Min = .0 Max = 25.7 (Baseline Sh-Ur on NRAO512 ) RMS = 6.1 Total time: 1435 minutes ( 23.9 hours). Key: 65=DSS65 Kk=KOKEE Nt=NOTO Gn=NRAO20 Sh=SESHAN25 Ur=URUMQI 65 Kk Nt Gn Sh Ur Avg % obs. time: 19 25 27 34 29 26 27 % cal. time: 2 2 2 3 2 2 2 % slew time: 38 11 41 15 43 30 29 % idle time: 39 60 28 46 25 40 40 # of tapes : .4 .5 1.7 .6 1.8 1.6 total # scans: 233 219 246 270 203 236 234 # scans/hour : 9 9 10 11 8 9 9.8 Avg scan (sec): 73 102 96 110 123 96 100 # OF OBSERVATIONS BY BASELINE | 65 Kk Nt Gn Sh Ur StnTotal -------------------------------------- 65|233 59 206 156 80 132 610 Kk| 219 65 159 124 110 635 Nt| 246 146 106 164 621 Gn| 270 84 113 536 Sh| 203 178 717 Ur| 236 645 Number of 2-station scans: 149 Number of 3-station scans: 121 Number of 4-station scans: 100 Number of 5-station scans: 38 Number of 6-station scans: 26 Total # of scans, observations: 434 1882 Average baseline components for all observations Average XY = 6732. Average XZ = 4504. Average YZ = 4542. Average length = 6798.