CORE-B210 (Continuous Observations of the Rotation of the Earth-B210) 1998 July 15 Notes prepared by Cynthia Thomas, NVI/GSFC Schedule name: CB210.SKD on CDDIS Nominal Start: 18:30 U.T. on July 15 (day 196) first observation at 18:30 U.T. on 4C39.25 for SM-FT-GC-KK- MC-NY first observation at 18:30 U.T. on 1958-179 for 45-KA Duration: 24 hours Nominal Stop: 18:30 U.T. on July 16 (day 197) last observation at 18:11 U.T. on 0454-234 for 45 last observation at 18:21 U.T. on 1739+522 for SM-NY-GC last observation at 18:26 U.T. on 1124-186 for MC last observation at 18:27 U.T. on CTA26 for KA last observation at 18:33 U.T. on 0823+033 for FT-KK 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) 157 73323401 DSS45 T 45 1 (TT) 238 16426001 Fortaleza F FT 2 (HDT) 150 72974801 Fairbanks A GC 1 (TT) 275 40476601 Kashima-26 Q KA 3 (HDT) 272 18567601 Kokee K KK 1 (TT) 296 72983001 Medicina B MC 3 (HDT) 306 72308801 Ny Alesund N NY 1 (TT) 270 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. 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 will record this experiment on thin tapes in low density. There are only 3 MKIV drives at Haystack, so Ny Alesund, DSS45, and Kokee will record on thin tapes in high density. 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 ./cb210.skd for experiment CB210 (all scans with at least one subnet station) SOURCE |0 6 12 18 | #SCANS #OBS #Obs/bl 0003-066Ix x xx x x x x x xxx x x xx x I 17 27 2.1 0048-097I x x x x x x x x xx xI 11 39 3.5 0059+581I x x x x x x x x x x x x x x x I 15 217 12.7 0119+041I xx x x xx xx x xxx x xx xx xI 18 20 1.5 0229+131I x x x xx x x xx xx x x x I 14 67 4.8 CTA26 I x x x xx x x x x xx x x I 13 13 1.0 0454-234I xx x x x x x x x x x x x x xxI 16 30 2.8 0458-020I x x x x x xx x xxxI 11 41 3.3 0528+134Ix xx x x xx x x x x xxx x xxx x x xxI 22 113 8.2 0552+398I xxx x x x x x x x x xx x x x x x x x xx xI 23 241 16.0 0718+793I x x x x x xI 6 14 .6 0727-115Ix x x x xx x x x x x xx xx x xxx x xx xxxI 25 69 7.1 0804+499I xx xx x x x x x x x x x x x I 15 148 8.8 0823+033I x xx xx x xx xxx x xx xx x I 17 27 2.1 OJ287 I x x x xxxxx xx x x x x I 14 14 .9 0919-260I x x I 2 2 .3 0920-397I x I 1 1 .1 4C39.25 Ix x xx x xx x x xx x x x x xx x x x x x x x xx I 26 292 19.1 OK290 I x x x x x xx xI 8 10 .6 0955+476I x x x I 3 33 3.6 1034-293Ix x x x xxxx x x x x I 12 16 1.3 1044+719I x x x x x x x I 7 105 4.9 1124-186Ix xx x x x x xx x x x x I 13 21 1.8 1128+385I x x x x I 4 19 1.3 1144-379I x x x x xx x x x I 9 13 1.4 1219+044I x x x x x x xx x xx x x xx x I 16 18 1.4 1255-316I x x x I 3 3 .2 1300+580I x I 1 3 .1 1308+326I xx x x x xx x xx x xx x x x I 16 51 3.0 1334-127I x x xx x xx x xx x x xx xx x x I 18 42 4.9 1351-018I x x x x x xx I 7 9 .7 1357+769Ix x x x x I 5 75 3.4 1606+106Ix xxx xx xxxx x xx x x x x x x x I 20 105 7.7 1622-253I xx x x xx x x x x x I 11 15 1.3 NRAO512 I x x x x x x x xx x xx xx x x I 16 186 13.1 1739+522Ix x x x x x xx x x x x x x x xx x x x I 20 245 15.2 1741-038I x xx xx x xx xxx x x x xxx x x xxx xx xx xI 27 109 8.9 1749+096I x x x x x x x xx xxI 11 79 5.9 1921-293I x x x x x xx xx x xx x xxx x xx xI 20 40 4.0 1954-388I x x x xxx x x x xx x xx I 14 20 2.2 1958-179I x x x x x xxx xx x x x x xx x xx x xI 21 35 3.1 2128-123I x x x x x I 5 7 .6 2145+067Ix x x xx xx xx xx xxx x xx x x xx x x x x xI 27 110 8.3 2234+282I x xx x x x x xx x x x I 12 42 2.7 2255-282I x x x x x xx x xI 9 11 1.0 Total scans, obs: 601 2797 Average number of obs. per baseline per source (normalized by up-time) = 4.4 Min = .0 Max = 31.3 (Baseline 45-Gc on NRAO512 ) RMS = 7.0 Total time: 1447 minutes ( 24.1 hours). Key: Sm=CRIMEA 45=DSS45 Ft=FORTLEZA Gc=GILCREEK Ka=KASHIMA Kk=KOKEE Mc=MEDICINA Ny=NYALES20 Sm 45 Ft Gc Ka Kk Mc Ny Avg % obs. time: 31 30 33 35 43 47 35 34 36 % cal. time: 1 2 1 3 3 3 3 3 2 % slew time: 25 29 25 20 23 16 34 13 23 % idle time: 41 37 39 40 29 32 26 48 36 # of tapes : 2.0 .5 2.0 1.0 2.6 .8 2.1 .6 total # scans: 157 238 150 275 272 296 306 270 245 # scans/hour : 6 9 6 11 11 12 12 11 10.2 Avg scan (sec): 172 110 196 112 137 140 100 109 134 # OF OBSERVATIONS BY BASELINE | Sm 45 Ft Gc Ka Kk Mc Ny StnTotal ---------------------------------------------- Sm|157 35 65 81 73 45 143 108 660 45| 238 4 84 183 159 22 34 494 Ft| 150 51 8 41 123 64 556 Gc| 275 161 200 141 179 773 Ka| 272 184 85 117 656 Kk| 296 69 111 526 Mc| 306 227 957 Ny| 270 972 Number of 2-station scans: 250 Number of 3-station scans: 126 Number of 4-station scans: 102 Number of 5-station scans: 72 Number of 6-station scans: 39 Number of 7-station scans: 12 Number of 8-station scans: 0 Total # of scans, observations: 601 2797 Average baseline components for all observations Average XY = 5196. Average XZ = 5638. Average YZ = 4642. Average length = 6620.