CORE-B107 (Continuous Observations of the Rotation of the Earth-B107) 1998 March 11 Notes prepared by Cynthia Thomas, NVI/GSFC Schedule name: CB107.SKD on CDDIS Nominal Start: 18:30 U.T. on March 11 (day 070) first observation at 18:30 U.T. on 0528+134 for FT-ON first observation at 18:30 U.T. on 0804+499 for AP-65-GC-KA -NY-WZ Duration: 24 hours Nominal Stop: 18:30 U.T. on March 12 (day 071) last observation at 18:21 U.T. on OJ287 for 65 last observation at 18:22 U.T. on 2128-123 for FT last observation at 18:33 U.T. on 0955+476 for AP-GC-KA-NY -ON-WZ 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) 244 72828201 DSS65 M 65 1 (TT) 288 16658501 Fortaleza F FT 2 (HDT) 136 t2974801 Fairbanks A GC 1 (TT) 277 40476601 Kashima-26 Q KA 3 (HDT) 201 18567601 Ny Alesund N NY 1 (TT) 281 73313301 Onsala T ON 3 (HDT) 205 72137701 Wettzell V WZ 3 (HDT) 319 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. 7) The source models were updated as of the middle of August by Dave Shaffer. 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 ./cb107.skd for experiment CB107 (all scans with at least one subnet station) SOURCE |0 6 12 18 | #SCANS #OBS #Obs/bl 0003-066I I 0 0 .0 0048-097Ix xx x x x x xx xx x xx x I 15 47 4.7 0059+581I x x x x x x x x x x x x x x xI 15 330 13.1 0106+013I x x x x x xx x x x I 10 14 1.1 0119+115I x x x xx x x xI 8 30 2.0 0119+041I x xx x x x x x x x x x I 12 30 2.3 0229+131I xx x x x x I 6 21 1.3 0235+164I x I 1 1 .1 CTA26 I x x x x x x x xx x xx x x x xx xI 18 41 5.6 0454-234I x x x xx xI 6 8 1.2 0458-020I x x I 2 7 .6 0528+134I xx xx x x xx x x xx x x xx x x x x xx I 22 169 11.1 0552+398Ix x xx xx x xx xx xx xx x x x xx x x x xx x I 27 414 20.2 0556+238I x x x x xx x x x x I 10 68 4.0 0718+793I x x I 2 12 .4 0727-115I xx x x x x x x x x x x I 12 38 4.5 0749+540Ix x x I 3 57 2.4 0804+499I x I 1 15 .6 0805+410Ix x x I 3 26 1.2 0823+033I x x x x x x x x x x x xxxx x x x I 18 68 5.4 OJ287 Ix x xx xx x x xxx xx x x x I 16 32 1.8 0919-260I x x x x xxI 6 6 .9 4C39.25 Ix x xx x x x x x x x x xx xx x x x xx x I 22 356 17.8 OK290 I xx x x x x I 6 19 1.1 0955+476I x x x x x x x x x x x I 11 195 8.6 1044+719I x x x x x x x x x x I 10 211 7.9 1053+815I I 0 0 .0 1124-186I x x x x x x I 6 12 1.6 1128+385I x I 1 15 .7 1219+044I x x x x x x xx x xx xx xx xI 16 36 2.8 1300+580I x I 1 10 .4 1308+326I x x x x x x x x x xI 10 73 3.9 1334-127I x xx x x x xx x xx x xI 13 40 4.3 1351-018I x x x I 3 9 .7 1357+769I x x x x x x I 6 126 4.5 1606+106Ix x x x x xxx x x x x x x x x x I 17 153 10.6 1622-253I xx x x x x x xx I 9 15 2.4 NRAO512 I x x x x x x x x x x x x xI 13 228 11.3 1726+455I x I 1 15 .7 1739+522I x x x x x x x x x x x x xx xx x xI 18 352 15.3 1741-038I xxx x x x xx x x x x xxx x x x x x x I 21 96 10.3 1749+096I x x x x x x x x x I 9 32 2.3 1908-201I xx x xx xxx x xx x x I 13 17 2.4 1958-179I x I 1 3 .3 2121+053I x x x x xx x x xxx x x I 13 31 2.4 2128-123I xx x x x x x xx xx x x I 13 17 2.4 2134+00 I x x xx xx x x xx I 10 18 1.5 2145+067Ix xx x x x x x x x x x x xx x I 16 98 7.3 2234+282I x x xx x x xx x x x x x x x I 15 100 5.5 2255-282I x xx x x x x xx xxx I 12 12 2.3 Total scans, obs: 499 3723 Average number of obs. per baseline per source (normalized by up-time) = 4.4 Min = .0 Max = 65.5 (Baseline Ny-Wz on CTA26 ) RMS = 6.6 Total time: 1444 minutes ( 24.1 hours). Key: Ap=ALGOPARK 65=DSS65 Ft=FORTLEZA Gc=GILCREEK Ka=KASHIMA Ny=NYALES20 On=ONSALA60 Wz=WETTZELL Ap 65 Ft Gc Ka Ny On Wz Avg % obs. time: 20 25 29 36 36 35 37 35 32 % cal. time: 2 3 1 3 2 3 2 3 2 % slew time: 54 39 22 21 19 14 15 11 24 % idle time: 22 32 46 38 41 45 45 48 40 # of tapes : 1.3 .5 1.9 .6 2.2 .6 2.2 2.2 total # scans: 244 288 136 277 201 281 205 319 243 # scans/hour : 10 11 5 11 8 11 8 13 10.2 Avg scan (sec): 73 76 185 114 156 110 157 97 121 # OF OBSERVATIONS BY BASELINE | Ap 65 Ft Gc Ka Ny On Wz StnTotal ---------------------------------------------- Ap|244 142 107 166 85 162 113 141 884 65| 288 92 124 83 204 158 274 929 Ft| 136 53 11 64 77 85 981 Gc| 277 179 192 131 141 788 Ka| 201 132 112 113 804 Ny| 281 161 226 1057 On| 205 195 923 Wz| 319 1080 Number of 2-station scans: 165 Number of 3-station scans: 106 Number of 4-station scans: 50 Number of 5-station scans: 51 Number of 6-station scans: 50 Number of 7-station scans: 68 Number of 8-station scans: 9 Total # of scans, observations: 499 3723 Average baseline components for all observations Average XY = 4653. Average XZ = 4133. Average YZ = 3334. Average length = 5141.