CORE-B206 (Continuous Observations of the Rotation of the Earth-B206) 1997 December 10 Notes prepared by Cynthia Thomas, NVI/GSFC Schedule name: CB206.SKD on CDDIS Nominal Start: 18:30 U.T. on December 10 (day 344) first observation at 18:30 U.T. on 1044+719 for SM-GC-KA-KK-MC-SH first observation at 18:33 U.T. on NRAO512 for FT first observation at 00:45 U.T. on 1300+580 for 15 (day 345) Duration: 24 hours Nominal Stop: 18:30 U.T. on December 11 (day 345) last observation at 16:47 U.T. on 0804+499 for 15 last observation at 18:15 U.T. on 1606+106 for FT last observation at 18:18 U.T. on 0552+398 for MC last observation at 18:22 U.T. on 0454-234 for SM last observation at 18:29 U.T. on 0823+033 for GC-SH last observation at 18:31 U.T. on 1144-379 for KA-KK Correlator: Washington **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 2 (HDT) 134 73323401 DSS15 D 15 1 (TT) 232 72318701 Fortaleza F FT 1 (HDT) 122 72974801 Fairbanks A GC 1 (TT) 317 40476601 Kashima Q KA 3 (HDT) 285 18567601 Kokee K KK 1 (TT) 301 72983001 Medicina B MC 2 (HDT) 224 72308801 Seshan D SH 3 (HDT) 253 72336101 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. All three of the CORE-B networks were designed to have EOP precision comparable to the NEOS and CORE-A networks. Although simultaneous data would be best for comparison of EOP, it is not always feasible, and therefore the CORE-B experiments are scheduled as close as possible in time to the NEOS sessions. Because the Earth can change its orientation significantly from hour to hour, data from the CORE-B networks will be useful for comparisons only at the "seams" between observing days. The comparison will be done by examining the data from the last hour of the NEOS session and the first hour of the CORE-B session to see if they agree within the error bars and whether the trend of the hourly signal between the two days is smooth. In effect the NEOS/CORE-B sessions will give us 18 "mini- CONTs" of 48 hours length in 1997. 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. 4) The minimum SNR limits for most baselines were set to 20 for X-band and 15 for S-band. 5) This schedule was made using 45 sources which helped improve the sky coverage. 6) The source models were updated as of the middle of August by Dave Shaffer. Crimea and Fortaleza were tagged along to this schedule file. Procedures ========== There are no special procedures for this experiment. Please use your standard SGP procedures. Correlation ========== This experiment will be correlated at the Washington Correlator with all baselines being correlated. SKED Summary from file ./cb206.skd for experiment CB206 (all scans with at least one subnet station) SOURCE |0 6 12 18 | #SCANS #OBS #Obs/bl 0003-066I x x xxx x x x x x x xx x I 14 74 6.5 0048-097I x x x x x I 5 23 2.2 0059+581I x x x x xx x x x x x x x x xx xI 17 250 11.1 0119+041Ix x x xx x x I 7 29 2.2 0229+131I x x x x x x xx xI 9 43 2.9 CTA26 I x x x x xx I 6 19 1.5 0454-234I xx xx x x x x x x xx x I 13 29 3.3 0458-020I x x x xx xx x x I 9 38 3.1 0528+134I x xx x x xx x x x x xx xx x x x I 18 96 6.5 0552+398I x x x x x x xxx xx xx x xxx xx xx x xx xI 25 266 14.3 0718+793I x x x x x x x x x I 9 31 1.4 0727-115I xx x x x xx x xx x x I 12 41 5.1 0804+499I x x x x x x x x x x x x x x I 14 176 8.9 0823+033Ix x x xx x x x x x I 10 41 3.1 OJ287 I x x x x x x I 6 14 .8 0919-260I xx x x x x x I 7 13 1.5 0920-397I x x x x x I 5 7 1.2 4C39.25 Ix x xx xxx xx x x x x xx xx x xx x x xx x x I 26 255 13.9 OK290 I x x x x xx x xx x xI 11 55 3.4 0955+476Ix x x x x x x x I 8 77 3.8 1034-293I x x x I 3 7 .9 1044+719Ix x x x x x x x x x x x x I 13 259 10.7 1124-186I x x x x x x x x x I 9 17 1.9 1128+385I x x x x x x x x x x x I 11 113 6.3 1144-379I x x x x x x I 6 12 1.8 1219+044I x x x x xx x I 7 25 1.9 1255-316Ix x x x I 4 6 .8 1300+580I x x x x x I 5 13 .5 1308+326Ix x x x x xx x x xx x x I 13 66 3.7 1334-127Ix x x x x x x x x xx xx I 13 34 4.1 1351-018I x x xx x I 5 5 .5 1357+769I x x x x x x x x x I 9 185 7.6 1606+106I x x x x x x x x x xx x x x x xx I 17 82 5.7 1622-253I I 0 0 .0 NRAO512 I x xx x x x x x x xx xx xx x x xx xI 20 169 9.0 1739+522I xx x xx x xx x x xx x x xx x x xx x x x xI 24 294 14.4 1741-038I xx xx x x xx x xx xx x xxx xI 18 67 5.6 1749+096I x x x I 3 18 1.3 1921-293I x x xx x x x I 7 15 1.9 1954-388I x x x x x x I 6 8 1.3 1958-179I x x x x x x xx x I 9 26 2.9 2128-123I x x x x x x x I 7 18 2.2 2145+067Ix x x xx x x x xx x xx x xx x I 17 98 7.1 2234+282Ix x x xx x x x x xx x I 12 55 3.4 2255-282I x x x xxxx x x xx x I 12 14 1.7 Total scans, obs: 481 3183 Average number of obs. per baseline per source (normalized by up-time) = 4.4 Min = .0 Max = 26.7 (Baseline 15-Gc on 0552+398) RMS = 5.6 Total time: 1443 minutes ( 24.1 hours). Key: Sm=CRIMEA 15=DSS15 Ft=FORTLEZA Gc=GILCREEK Ka=KASHIMA Kk=KOKEE Mc=MEDICINA Sh=SESHAN25 Sm 15 Ft Gc Ka Kk Mc Sh Avg % obs. time: 20 22 13 38 38 38 29 37 29 % cal. time: 1 2 1 3 3 3 2 2 2 % slew time: 23 27 12 20 23 13 26 42 23 % idle time: 53 47 72 37 35 44 42 17 43 # of tapes : 1.3 .4 .8 .7 2.3 .7 1.8 2.3 total # scans: 134 232 122 317 285 301 224 253 233 # scans/hour : 5 9 5 13 11 12 9 10 9.7 Avg scan (sec): 134 83 96 104 115 111 112 127 110 # OF OBSERVATIONS BY BASELINE | Sm 15 Ft Gc Ka Kk Mc Sh StnTotal ---------------------------------------------- Sm|134 50 37 95 83 48 117 96 666 15| 232 88 177 93 175 106 63 663 Ft| 122 98 25 73 81 20 631 Gc| 317 185 226 175 152 859 Ka| 285 195 122 235 800 Kk| 301 95 145 787 Mc| 224 128 888 Sh| 253 1072 Number of 2-station scans: 84 Number of 3-station scans: 135 Number of 4-station scans: 115 Number of 5-station scans: 76 Number of 6-station scans: 47 Number of 7-station scans: 19 Number of 8-station scans: 5 Total # of scans, observations: 481 3183 Average baseline components for all observations Average XY = 6167. Average XZ = 4804. Average YZ = 4364. Average length = 6588.