CORE-B112 (Continuous Observations of the Rotation of the Earth-B112) 1998 November 4 Notes prepared by Cynthia Thomas, NVI/GSFC Schedule name: CB112.SKD on CDDISA Nominal Start: 18:30 U.T. on November 4 (day 308) first observation at 18:30 U.T. on 2145+067 for AP-FT-NY-ON-WZ first observation at 18:30 U.T. on 0805+410 for GC-TS first observation at 19:45 U.T. on 1739+522 for 15 Duration: 24 hours Nominal Stop: 18:30 U.T. on November 5 (day 309) last observation at 12:57 U.T. on 0454-234 for 15 last observation at 18:16 U.T. on 0119+041 for ON-TS last observation at 18:19 U.T. on 1749+096 for FT-GC-NY last observation at 18:27 U.T. on NRAO512 for AP-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) 247 72828201 DSS15 D 15 1 (TT) 193 72318701 Fortaleza F FT 2 (HDT) 132 72974801 Fairbanks A GC 2 (TT) 311 40476601 Ny Alesund N NY 1 (TT) 307 73313301 Onsala T ON 3 (HDT) 258 72137701 Tsukuba U TS 1 (TT) 288 73452301 Wettzell V WZ 3 (HDT) 311 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 all 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. 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 98AUG11 CORE-A042, 98AUG17 EURO44, and 98AUG25 experiments. Station Information =================== There are four thin tape stations in this experiment and Haystack only has three Mark IV tape drives. So, Fairbanks will record this experiment in low density so that the other three thin tape stations can record in high density.. Procedures ========== Please generate the procedures for this session using drudg. Correlation ========== This experiment will be correlated at the Haystack Correlator with all baselines being correlated. SKED Summary from file ./cb112.skd for experiment CB112 (all scans with at least one subnet station) SOURCE |0 6 12 18 | #SCANS #OBS #Obs/bl 0003-066I xx x x x xx I 7 15 1.5 0048-097I x x x x I 4 11 1.1 0059+581I x x x x x xx x x x x x x x x xx xx x I 20 414 17.2 0106+013Ix x x x x xx xx xI 10 10 .8 0119+115I x x x x x I 5 16 1.1 0119+041I x x x x x x xx x x x I 11 42 3.3 0229+131I x x x x x xx x x x x I 11 49 2.9 0235+164I I 0 0 .0 CTA26 Ix xx x x xx x x x x I 11 21 1.9 0454-234I x xx x x x x I 7 15 2.4 0458-020I x x x x x I 5 12 .9 0528+134I x xx xxx x x x xx xx xxxx x x x xI 21 161 10.4 0552+398I xxx xx x xx x x xx xx x x x x x xx xx x x xx xI 28 414 20.0 0556+238I x x x x x x x xx x x I 11 61 3.3 0718+793I x x x x x I 5 24 .9 0727-115I x xx xx x x xx x x x xxI 14 37 4.4 0749+540I x x x x x x x x x x x x x x x xI 16 296 12.2 0804+499I x x x x x x x I 7 118 5.5 0805+410I x x x I 3 13 .6 0823+033I x x xxx xx x x x x xx x x x xI 17 38 3.1 OJ287 I x x I 2 2 .1 0919-260I x x x x I 4 4 .8 4C39.25 Ixx xx xx x xx x x x x xx x x x xx x x I 22 333 16.3 OK290 I x x x x x x x xxx I 10 26 1.3 0955+476I x x x xx x x x I 8 127 5.2 1044+719Ix x x x x x x x x xx x x I 13 264 10.8 1053+815I I 0 0 .0 1124-186I x x x x x x I 6 8 1.2 1128+385I x x x x x I 5 55 2.6 1219+044Ix x x x x x x xx xI 10 16 1.3 1300+580Ix x x I 3 40 1.5 1308+326I x xx x xx I 6 21 1.0 1334-127I xx x x x x x x I 8 12 1.7 1351-018I x x x x x I 5 9 1.1 1357+769I x x x x x x x x x xI 10 199 8.1 1606+106Ix x xx xx x x x x x xI 12 44 2.9 1622-253Ix x x x x x x I 7 7 1.1 NRAO512 I x xx xx xx x xx xx x x x x x x x x x x xxI 24 330 15.5 1726+455I x I 1 21 .9 1739+522Ixx x x x x x x xx x x x x x xx x x xx xx I 23 416 18.2 1741-038Ix x x x x xx xxxx x x x x x x x xI 19 67 10.2 1749+096Ix x x x x xx x x x I 10 50 3.4 1908-201I xx x x x xI 6 12 1.8 1958-179I x xx x x I 5 7 1.0 2121+053I x x x xx x x I 7 23 1.7 2128-123I x x xx x x x x x x I 10 22 3.2 2134+00 I x x x x x xx xx I 9 11 .9 2145+067I x x x x x xx x x x x xx x I 14 79 5.8 2234+282I x x x xx x x x x xx xx x x x I 16 115 5.7 2255-282I x x x x I 4 8 1.7 Total scans, obs: 492 4095 Average number of obs. per baseline per source (normalized by up-time) = 4.6 Min = .0 Max = 68.6 (Baseline Ny-On on 1741-038) RMS = 6.8 Total time: 1439 minutes ( 24.0 hours). Key: Ap=ALGOPARK 15=DSS15 Ft=FORTLEZA Gc=GILCREEK Ny=NYALES20 On=ONSALA60 Ts=TSUKUB32 Wz=WETTZELL Ap 15 Ft Gc Ny On Ts Wz Avg % obs. time: 20 18 26 37 40 40 33 37 31 % cal. time: 2 2 1 3 3 2 3 3 2 % slew time: 55 25 20 20 16 20 11 12 22 % idle time: 20 54 51 38 39 35 52 46 42 # of tapes : 1.3 .3 1.6 1.1 .7 2.4 .6 2.3 total # scans: 247 193 132 311 307 258 288 311 255 # scans/hour : 10 8 5 12 12 10 12 12 10.7 Avg scan (sec): 72 82 175 104 113 134 99 103 110 # OF OBSERVATIONS BY BASELINE | Ap 15 Ft Gc Ny On Ts Wz StnTotal ---------------------------------------------- Ap|247 144 102 190 180 138 124 152 927 15| 193 66 161 112 89 118 90 901 Ft| 132 70 78 85 31 95 967 Gc| 311 230 175 238 175 1103 Ny| 307 214 205 249 915 On| 258 171 242 925 Ts| 288 171 1025 Wz| 311 1427 Number of 2-station scans: 126 Number of 3-station scans: 107 Number of 4-station scans: 57 Number of 5-station scans: 58 Number of 6-station scans: 66 Number of 7-station scans: 64 Number of 8-station scans: 14 Total # of scans, observations: 492 4095 Average baseline components for all observations Average XY = 5231. Average XZ = 4331. Average YZ = 3834. Average length = 5690.