CORE-B110 (Continuous Observations of the Rotation of the Earth-B110) 1998 july 01 Notes prepared by Cynthia Thomas, NVI/GSFC Schedule name: CB110.SKD on CDDIS Nominal Start: 18:30 U.T. on July 01 (day 182) first observation at 18:30 U.T. on 1044+719 for YK-GC-KA first observation at 18:30 U.T. on 4C39.25 for AP-15-FT-ON-WZ Duration: 24 hours Nominal Stop: 18:30 U.T. on July 02 (day 183) last observation at 18:25 U.T. on 0106+013 for YK last observation at 18:27 U.T. on 1334-127 for FT-ON-WZ last observation at 18:28 U.T. on 0048-097 for 15-KA last observation at 18:31 U.T. on CTA26 for AP-GC 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 Algonquin G AP 2 (HDT) 253 72828201 Yellowknife X YK 2 (HDT) 118 72965101 DSS15 D 15 1 (TT) 275 72318701 Fortaleza F FT 2 (HDT) 125 72974801 Fairbanks A GC 1 (TT) 276 40476601 Kashima-26 Q KA 3 (HDT) 190 18567601 Onsala T ON 3 (HDT) 195 72137701 Wettzell V WZ 3 (HDT) 261 72247801 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 50 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 98Mar03 NEOS-A253 and the 98JAN27XA CORE-A028 experiments. Procedures ========== There are no special procedures for this experiment. Please use your standard SGP procedures. Correlation ========== This experiment will be correlated at the Haystack Correlator with all baselines being correlated. SKED Summary from file ./cb110.skd for experiment CB110 (all scans with at least one subnet station) SOURCE |0 6 12 18 | #SCANS #OBS #Obs/bl 0003-066I xx x x x x x I 7 15 1.4 0048-097I x x x x xx I 6 19 1.8 0059+581I x x x x x x x x x x x x xI 13 282 11.2 0106+013Ix xx xx xxx xx xxx x x x x xxx I 20 20 1.6 0119+115I xx x x x x x x x x x x x x I 14 40 2.8 0119+041I x x x xx x x x I 8 16 1.2 0229+131I x I 1 10 .7 0235+164I x x x x I 4 6 .4 CTA26 I x x x x xx x x x xx x x x I 14 22 1.8 0454-234I x xx x x x xx x x I 10 18 3.2 0458-020I xx x x x x x x x x x I 11 31 2.6 0528+134I x x x x x xxx x x xxxI 13 38 2.5 0552+398Ix xxx x xx x x xx x x x x x x x x xxx x x x xx I 27 413 19.4 0556+238I I 0 0 .0 0718+793I x x x x x x x x x xI 10 28 1.0 0727-115I x x xxx x x xx x xxx x xxx xI 18 60 6.4 0749+540I x x x x x I 5 66 2.7 0804+499Ix x x x x x x x xI 9 116 5.0 0805+410I x x x x x x xI 7 33 1.6 0823+033I x x x x x xx x x x x x I 12 31 2.4 OJ287 Ixx x x xx xx x x x I 11 23 1.5 0919-260I x x xx I 4 4 .9 4C39.25 I xx x x x x xx x x x x x x xxx x xx x xI 22 342 16.3 OK290 I x x x x x x x x xxI 10 24 1.5 0955+476I x I 1 15 .7 1044+719I x x x x x x x I 7 89 3.2 1053+815I x x I 2 6 .3 1124-186Ix x x x x x x x I 8 18 2.5 1128+385I x x x x x I 5 27 1.4 1219+044Ixxx x x x xx x xx xx x I 14 30 2.3 1300+580I x x x x I 4 24 .9 1308+326I x x x x x x x x x I 9 21 1.2 1334-127Ix x x x x xx xx x xxx x x I 15 37 3.9 1351-018I x xx x x I 5 9 .7 1357+769I x x x x x x I 6 80 2.9 1606+106I x x xx x x x xx x x x I 12 52 3.7 1622-253I x x x x x xxx xI 9 9 1.3 NRAO512 I x x x I 3 35 1.7 1726+455I x x I 2 12 .5 1739+522I x x x x x x x x x x x x x I 13 257 10.8 1741-038I x x xx x x xx x xx xxx x xx xx x I 20 95 8.1 1749+096I x x x x x x xxxx x I 11 71 5.0 1908-201I x xx x xx x x I 8 20 2.8 1958-179Ix x x x xx x x I 8 10 1.1 2121+053I x x x x x x x x x x x I 11 21 1.6 2128-123I x x x xx x x x x xxx I 12 28 3.3 2134+00 Ix xx xx xx xx x x x x x x xx x I 18 18 1.4 2145+067I xx x x xx x x xx x x x x I 14 86 6.3 2234+282I x x xx x I 5 17 1.0 2255-282I x xx x x I 5 13 3.1 Total scans, obs: 483 2757 Average number of obs. per baseline per source (normalized by up-time) = 3.3 Min = .0 Max = 30.3 (Baseline On-Wz on 0106+013) RMS = 5.5 Total time: 1442 minutes ( 24.0 hours). Key: Ap=ALGOPARK Yk=ARIES_9M 15=DSS15 Ft=FORTLEZA Gc=GILCREEK Ka=KASHIMA On=ONSALA60 Wz=WETTZELL Ap Yk 15 Ft Gc Ka On Wz Avg % obs. time: 22 25 29 29 34 38 36 39 31 % cal. time: 2 1 3 1 3 2 2 3 2 % slew time: 54 19 37 23 19 19 15 10 25 % idle time: 20 53 29 45 42 39 46 47 40 # of tapes : 1.4 1.5 .5 1.8 .6 2.3 2.2 2.4 total # scans: 253 118 276 125 276 190 195 261 211 # scans/hour : 10 4 11 5 11 7 8 10 8.8 Avg scan (sec): 76 185 91 201 109 173 161 130 140 # OF OBSERVATIONS BY BASELINE | Ap Yk 15 Ft Gc Ka On Wz StnTotal ---------------------------------------------- Ap|253 72 208 81 170 76 84 120 837 Yk| 118 83 33 104 69 78 68 627 15| 276 69 207 115 83 95 673 Ft| 125 36 7 59 83 655 Gc| 276 154 104 116 650 Ka| 190 96 102 652 On| 195 185 580 Wz| 261 840 Number of 2-station scans: 161 Number of 3-station scans: 158 Number of 4-station scans: 46 Number of 5-station scans: 35 Number of 6-station scans: 47 Number of 7-station scans: 31 Number of 8-station scans: 5 Total # of scans, observations: 483 2757 Average baseline components for all observations Average XY = 5186. Average XZ = 4165. Average YZ = 3896. Average length = 5624.