CORE-A023 (Continuous Observations of the Rotation of the Earth-A023) 1997 November 18 Notes prepared by Cynthia Thomas, NVI/GSFC Schedule name: CA023.SKD on CDDIS Nominal Start: 18:00 U.T. on November 18 (day 322) first observation at 18:00 U.T. on 1357+769 for GC-MA-WF first observation at 18:00 U.T. on 0104-408 for HH-HO Duration: 24 hours Nominal Stop: 18:00 U.T. on November 19 (day 323) last observation at 17:53 U.T. on 0454-234 for HO last observation at 17:56 U.T. on 0229+131 for HH last observation at 18:01 U.T. on 1357+769 for GC-MA-WF Correlator: Haystack **Frequency Sequence**: CDP-WBCA - Modified CDP wide-band SX sequence. (720 MHz wide at X, 125 MHz wide at S), Shifted to avoid RFI at Matera 1 letter 2 letter Station Code Code # of tapes # of obs Occupation Code Fairbanks A GC 1 (TT) 445 40476601 HartRAO J HH 3 (HDT) 266 72326201 Hobart H HO 2 (HDT) 196 72425901 Matera I MA 3 (HDT) 389 72435701 Westford E WF 1 (TT) 413 72097301 Purpose ======= The purpose of the CORE-A sessions is to measure EOP simultaneously with NEOS, using a network of comparable precision, to assess the true accuracy of VLBI results. Both daily and hourly estimates of EOP for the NEOS and CORE-A sessions will be compared in detail. We hope to determine if there are any systematic differences between measurements of EOP with different networks because we will have sufficient data to make statistically significant studies. This is probably the most important set of experiments for this pre-CORE year because it will provide such a rich comparison data set. 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 hour of the schedule were considered for the minor options. The best 70% 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 47 sources which helped improve the sky coverage. 7) The source models were updated as of mid August 1997 by Dave Shaffer. Procedures ========== Please use the modified CDP Wide-band SX sequence, CDP-WBCA, for this experiment. Correlation ========== This experiment will be correlated at the Haystack Correlator with all baselines being correlated. SKED Summary from file ./ca023.skd for experiment CA023 (all scans with at least one subnet station) SOURCE |0 6 12 18 | #SCANS #OBS #Obs/bl 0003-066Ix x x xx xxx x xx x xI 14 14 3.5 0048-097I x x xx x xxxx xx xx xI 15 29 7.1 0059+581I xx xx x xx xx x x x xx xx xx xx xxx xx x x x I 28 84 16.8 0104-408I xx xxx xxxxxx xx I 13 17 5.6 0208-512I x x xx xxx xx x I 10 10 4.1 0229+131I x xxxxxxx xxx x I 12 12 2.3 CTA26 I xxxxx x I 6 6 1.5 0454-234Ixxxx x xxx xxxxx x xxI 18 26 8.8 0458-020Ix x x x x xx x xx x x I 12 14 3.4 0528+134Ixxxxx xxxxxxxx xx xxxx x x xxx x xxxxI 31 64 13.2 0537-441I x I 1 1 .3 0552+398I x xxxxx xxx xxxx xxxxx x x xxx xxxxxxx I 30 66 11.8 0637-752I x x x x x x x x x xI 10 10 4.1 0718+793I x x x x x I 5 5 1.0 0727-115Ixxxxx x x x xx xx xxxx I 17 23 7.0 0749+540I xx x x xx x x xx x xx xx xxx x xxx xxxx x xxI 29 81 16.5 0804+499I x x I 2 4 .8 0823+033I x x x x x x xxxxxx x x x I 17 19 4.1 OJ287 I x I 1 1 .1 4C39.25 Ix xx x xx xx xxxx xxxxxx xxxx xxxxx x xxxxxx I 34 90 13.9 0955+476Ixx xxxxxxxx xx xx xx x xx xxxx xx xx xxx xxx xx I 35 73 15.7 1034-293Ixxx x x xxxxx x xxI 13 15 5.0 1044+719I x x x x x x x x x x x x x x x x x x x x x xI 22 66 13.2 1057-797I x x x x x x x x I 8 8 3.3 1124-186I x xx xx x x xI 8 8 2.7 1128+385Ixx x x xxx x xxxxxxxx xxxxx x xx xxxI 28 49 6.0 1144-379I xxxxx x xx x I 9 9 3.1 1255-316I x I 1 1 .3 1300+580Ix x x x I 4 4 .8 1308+326I x x xx xxxx xxxx x xxxxx xxx xxxI 24 24 2.9 1334-127I xx xxx xx x xxx xx x I 14 14 3.0 1357+769I x x x x x x x x x x x x x x x x x x x x xI 22 66 13.2 1424-418I xx x xxxxx x x I 10 10 3.4 1606+106Ixxxx xxxx x x x xx x x x xxxxxxxx x xxI 29 35 6.6 1610-771I x x x x x x x x x x I 10 10 4.1 NRAO512 I xxx x x xx x x x x xx x xxxxxxxxxxxxxx xxxxI 32 81 14.5 1739+522Ixxx x xxx xx xx x xx xx x xxx xxx xxx xxxx xx x I 33 89 18.6 1741-038Ixx xx xxx x x xxx x x xx xxx xx x xx xxxxI 29 49 11.6 1815-553I x x I 2 2 .8 1921-293I xxxx xxxxxxxx xxx xxx I 18 18 5.9 1954-388I x x xx xxxxx x x I 11 11 3.8 1958-179Ix x x xx x xx I 8 14 4.6 2005-489I I 0 0 .0 2052-474I I 0 0 .0 2145+067Ix xxxx x xx x x x xxx xx x x xxx xxxx xxI 27 31 6.3 2234+282I xxxx x x x x I 8 8 1.1 2255-282I x x x x x x I 7 11 3.6 Total scans, obs: 717 1282 Average number of obs. per baseline per source (normalized by up-time) = 5.9 Min = .0 Max = 40.5 (Baseline Hh-Ma on 0528+134) RMS = 8.9 Total time: 1443 minutes ( 24.1 hours). Key: Gc=GILCREEK Hh=HARTRAO Ho=HOBART26 Ma=MATERA Wf=WESTFORD Gc Hh Ho Ma Wf Avg % obs. time: 46 41 31 45 50 42 % cal. time: 5 3 2 4 4 3 % slew time: 26 39 27 18 18 26 % idle time: 22 16 38 31 26 27 # of tapes : .8 2.5 1.9 2.8 .8 total # scans: 445 266 196 389 413 341 # scans/hour : 18 11 8 16 17 14.2 Avg scan (sec): 89 133 141 101 105 113 # OF OBSERVATIONS BY BASELINE | Gc Hh Ho Ma Wf StnTotal ---------------------------------- Gc|445 22 46 247 364 469 Hh| 266 143 142 37 435 Ho| 196 23 11 446 Ma| 389 247 896 Wf| 413 318 Number of 2-station scans: 457 Number of 3-station scans: 245 Number of 4-station scans: 15 Number of 5-station scans: 0 Total # of scans, observations: 717 1282 Average baseline components for all observations Average XY = 6011. Average XZ = 6007. Average YZ = 4747. Average length = 7219.