CORE-B211 (Continuous Observations of the Rotation of the Earth-B211) 1998 October 7 Notes prepared by Cynthia Thomas, NVI/GSFC Schedule name: CB211.SKD on CDDIS Nominal Start: 18:30 U.T. on October 7 (day 280) first observation at 18:30 U.T. on 1044+719 for SM-GC-KK-MC- NY-Ts first observation at 18:30 U.T. on 1124-186 for 45-FT Duration: 24 hours Nominal Stop: 18:30 U.T. on October 8 (day 281) last observation at 18:26 U.T. on CTA26 for 45 last observation at 18:27 U.T. on 1739+522 for SM-FT-MC last observation at 18:31 U.T. on 0528+134 for GC-KK-NY-TS 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 2 (HDT) 181 73323401 DSS45 T 45 1 (TT) 288 16426001 Fortaleza F FT 2 (HDT) 150 72974801 Fairbanks A GC 1 (TT) 315 40476601 Kokee K KK 2 (TT) 331 72983001 Medicina B MC 3 (HDT) 320 72308801 Ny Alesund N NY 1 (TT) 301 73313301 Tsukuba U TS 1 (TT) 389 73452301 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. 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. Station Information =================== Fairbanks and Kokee will record this experiment on thin tapes in low density. There are only 3 MKIV drives at Haystack, so Ny Alesund, DSS45, and Tsukuba will record on thin tapes in high density. This is the first CORE experiment with Tsukuba as a participating station. 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 ./cb211.skd for experiment CB211 (all scans with at least one subnet station) SOURCE |0 6 12 18 | #SCANS #OBS #Obs/bl 0003-066I x x x x xx xxx xx xxx x xx xx xx xx xx I 25 37 3.0 0048-097I x x x x x x x xxx I 10 43 4.0 0059+581I x x x x x x x x xx xx x x x x xx x xx xI 23 328 19.5 0119+041I x xx xxx xxx xx xxx xx xx xxxI 21 25 1.9 0229+131Ix x x x x xxx xx xxxx xx x xI 18 92 6.7 CTA26 Ix x xx xx x xx xxx x xx x x x x xI 20 28 2.2 0454-234I x x x x x x x x xxxxx xx x xxx xxx xI 23 45 4.6 0458-020I xx x x x x x xxx xxx x I 14 55 4.4 0528+134Ix x xxxxx x x x xx xxxx xxx x xx x xx xI 27 149 10.6 0552+398Ixx xxx x x x x x x xx xx xx xx xx x x x x I 25 238 14.5 0718+793I x x x x x x x x x x x I 11 21 1.0 0727-115I x xxx x x x xx x xxx xxx xx xx xx xx x I 25 60 6.5 0804+499Ix x x x x x xx x x x x xx I 14 138 7.9 0823+033I x xxx x xx xx x x xx I 13 17 1.3 OJ287 I x xx xx x x x I 8 8 .5 0919-260I x xxx x I 5 7 .6 0920-397I x I 1 1 .1 4C39.25 Ixx xx x x x xxx x x x xxx x xx x x xxx x xxx I 28 313 20.3 OK290 I x x x x x x x x x x xxI 12 16 1.1 0955+476I x x x x I 4 48 6.2 1034-293I xx xx x x x x x x x x x I 13 19 1.7 1044+719I x x x x x x x x xx I 10 156 8.1 1124-186I x xxx xx xx xx x x x xx xxxx xx I 21 37 3.4 1128+385I x x x x x xx x x I 9 57 3.6 1144-379Ix xx x x x x x x x I 10 14 1.1 1219+044I I 0 0 .0 1255-316Ix x x I 3 7 .6 1300+580I x x x x x x x I 7 47 2.3 1308+326I xx xx x x x x x x x x xx xI 16 76 5.3 1334-127I I 0 0 .0 1351-018I x x x xx x x xx x x I 11 17 1.4 1357+769I x x x x x xI 6 90 4.1 1606+106Ix xx xxx xxxx x xx x x x x x xx x xxI 23 127 9.3 1622-253Ixx xx xx x x xx x x xx xx x I 17 27 2.3 NRAO512 I x xx xxx xxx xx xx x x x x x x xx xI 22 257 17.1 1739+522I x x xx x x x x x x xx x x x x x xx xx xx xI 24 305 18.9 1741-038Ix xx xx xx x xx xx x x x xxxxxx xx xx xx x xx xI 31 111 9.0 1749+096I xxxx x x xI 7 53 3.9 1921-293Ix x xx xx xx x xx x xx xx xxx x x I 21 41 4.5 1954-388I x x x xx x x xx x xx x I 13 23 3.1 1958-179I x xx xx xx xx xx x xx x x x x x x xx I 22 42 4.0 2128-123I x xx x x x I 6 8 .6 2145+067Ix x xxxx xx x xxxx x xx xxx xx xxx xx xx xx I 30 119 9.0 2234+282Ix x xx x x x x x x x xx xx I 15 46 2.6 2255-282I xx xxx xxxx x x I 11 11 .9 Total scans, obs: 675 3359 Average number of obs. per baseline per source (normalized by up-time) = 5.2 Min = .0 Max = 35.8 (Baseline 45-Gc on NRAO512 ) RMS = 8.0 Total time: 1443 minutes ( 24.1 hours). Key: Sm=CRIMEA 45=DSS45 Ft=FORTLEZA Gc=GILCREEK Kk=KOKEE Mc=MEDICINA Ny=NYALES20 Ts=TSUKUB32 Sm 45 Ft Gc Kk Mc Ny Ts Avg % obs. time: 30 31 28 35 43 34 36 40 35 % cal. time: 2 3 1 3 3 3 3 4 3 % slew time: 29 33 26 22 18 37 17 13 24 % idle time: 38 31 43 38 34 24 42 42 36 # of tapes : 1.9 .5 1.8 1.0 1.3 2.1 .6 .7 total # scans: 181 288 150 315 331 320 301 389 284 # scans/hour : 7 11 6 13 13 13 12 16 11.8 Avg scan (sec): 144 94 164 98 113 94 104 89 112 # OF OBSERVATIONS BY BASELINE | Sm 45 Ft Gc Kk Mc Ny Ts StnTotal ---------------------------------------------- Sm|181 34 71 99 54 166 132 100 633 45| 288 2 95 183 22 44 245 495 Ft| 150 55 36 130 66 18 797 Gc| 315 227 155 213 222 1050 Kk| 331 84 137 233 810 Mc| 320 239 123 738 Ny| 301 174 983 Ts| 389 1212 Number of 2-station scans: 256 Number of 3-station scans: 149 Number of 4-station scans: 114 Number of 5-station scans: 88 Number of 6-station scans: 56 Number of 7-station scans: 12 Number of 8-station scans: 0 Total # of scans, observations: 675 3359 Average baseline components for all observations Average XY = 5207. Average XZ = 5618. Average YZ = 4643. Average length = 6627.