CORE-B207 (Continuous Observations of the Rotation of the Earth-B207) 1998 January 26 Notes prepared by Cynthia Thomas, NVI/GSFC Schedule name: CB207.SKD on CDDIS Nominal Start: 16:00 U.T. on January 26 (day 026) first observation at 16:00 U.T. on 4C39.25 for SM-GC-KA-KK-MC-NY first observation at 16:03 U.T. on 1739+522 for FT Duration: 24 hours Nominal Stop: 16:00 U.T. on January 27 (day 027) last observation at 15:50 U.T. on 0229+131 for FT last observation at 15:59 U.T. on 4C39.25 for GC-KK last observation at 16:03 U.T. on 0528+134 for SM-KA-MC-NY 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 Crimea C SM 3 (HDT) 230 73323401 Fortaleza F FT 2 (HDT) 148 72974801 Fairbanks A GC 1 (TT) 325 40476601 Kashima-26 Q KA 3 (HDT) 266 18567601 Kokee K KK 1 (TT) 298 72983001 Medicina B MC 3 (HDT) 315 72308801 Ny Alesund N NY 1 (TT) 282 73313301 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 45 sources which helped improve the sky coverage. 7) The source models were updated as of the middle of August by Dave Shaffer. Fortaleza was tagged along to this experiment because it is not certain that the station will be online by the start of this experiment. Fortaleza is still waiting for two encoders that are scheduled to be shipped on January 19. 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 ./cb207.skd for experiment CB207 (all scans with at least one subnet station) SOURCE |0 6 12 18 | #SCANS #OBS #Obs/bl 0003-066I xx xx x x xx x xx x xx x xx xx x xxI 22 40 4.9 0048-097I x x I 2 4 .5 0059+581I x x xx x x x x x x x x x x x x x I 17 227 13.7 0119+041I xx xx x x x x xx xx xx x x x xI 18 56 5.6 0229+131I x x x x x x x x x xx x x x xI 15 61 5.5 CTA26 I xx x x x x x x x xx x x x x I 15 36 3.9 0454-234I x x xx xx x x x x xx xx I 14 20 3.5 0458-020I xx x x x x x I 7 25 2.8 0528+134Ix xxx xx x xx xx x xx xxx x x xxx x xxx x x xI 29 160 14.5 0552+398Ix xx xx x x x x xx x xx x x xx x x x x xI 23 200 14.5 0718+793I x x x x I 4 6 .3 0727-115Ix x x xx x x x x xx xI 13 29 5.4 0804+499I x x x x x x x x x x x I 11 107 7.1 0823+033Ix x xx xx x x xx x x x xx xxx xI 19 59 6.0 OJ287 I xx x x x x x x x x x x xx xx xx I 18 24 2.0 0919-260I x x xI 3 7 1.3 0920-397I x I 1 1 .3 4C39.25 Ixx x x x xxx xx x xxx xx x x xxxxx x xx x xx I 29 279 20.0 OK290 I xx xx I 4 19 1.6 0955+476Ix x x x x x x x x x x x x I 14 144 9.4 1034-293I xx x x I 4 4 .7 1044+719I x x x x x x x x x x x x I 12 186 9.8 1124-186I x x x x x x x xI 8 12 2.0 1128+385I x x x x x xx x x I 9 80 5.5 1144-379I x xx x x I 5 7 2.0 1219+044I x xxx x x I 6 14 1.4 1255-316I x x x x I 4 6 1.3 1300+580Ix x x x x x x I 7 18 1.1 1308+326I xx x x x xx x x xx x I 12 80 6.3 1334-127I x x xx xx xx x xx xx x xI 15 25 5.0 1351-018I x xx x x x x x x xx I 11 18 2.0 1357+769I x x x x x x I 6 90 4.3 1606+106I xx x x x x xx xx x xxx xxxx x xx xI 22 91 8.5 1622-253I x x x x x x x x x I 9 17 3.0 NRAO512 I x x xx x x x xx x x xx x x x xI 17 145 10.5 1739+522I x xx x x x xx x xx x x xx x xx x xx x I 22 265 17.1 1741-038Ixx xx x x xx x xx xxx x xx xx xx xI 22 53 6.1 1749+096I x x x I 3 12 1.1 1921-293Ixx x x x xx x x xI 10 18 3.5 1954-388Ix x x xI 4 4 1.3 1958-179I I 0 0 .0 2128-123I I 0 0 .0 2145+067Ix xx x x x x x xx xx x xx xxxxx x xx xI 24 84 8.1 2234+282I x x x x x x x x xx x xx I 13 39 3.1 2255-282I x x x xx xx x x x I 10 14 2.7 Total scans, obs: 533 2786 Average number of obs. per baseline per source (normalized by up-time) = 5.3 Min = .0 Max = 31.8 (Baseline Kk-Ny on 4C39.25 ) RMS = 7.1 Total time: 1444 minutes ( 24.1 hours). Key: Sm=CRIMEA Ft=FORTLEZA Gc=GILCREEK Ka=KASHIMA Kk=KOKEE Mc=MEDICINA Ny=NYALES20 Sm Ft Gc Ka Kk Mc Ny Avg % obs. time: 39 18 42 43 47 34 34 37 % cal. time: 2 1 3 3 3 3 3 3 % slew time: 31 22 21 24 16 33 14 23 % idle time: 26 57 31 28 33 29 47 36 # of tapes : 2.4 1.2 .7 2.6 .8 2.2 1.0 total # scans: 230 148 325 266 298 315 282 266 # scans/hour : 9 6 13 11 12 13 11 11.1 Avg scan (sec): 147 110 114 143 137 94 105 121 # OF OBSERVATIONS BY BASELINE | Sm Ft Gc Ka Kk Mc Ny StnTotal ------------------------------------------ Sm|230 95 93 81 48 220 154 633 Ft| 148 80 18 38 133 95 709 Gc| 325 191 246 167 202 755 Ka| 266 222 104 143 810 Kk| 298 88 138 609 Mc| 315 230 1131 Ny| 282 925 Number of 2-station scans: 150 Number of 3-station scans: 151 Number of 4-station scans: 106 Number of 5-station scans: 71 Number of 6-station scans: 53 Number of 7-station scans: 2 Total # of scans, observations: 533 2786 Average baseline components for all observations Average XY = 5458. Average XZ = 5033. Average YZ = 3886. Average length = 6111.