CORE-A020 (Continuous Observations of the Rotation of the Earth-A020) 1997 October 7 Notes prepared by Cynthia Thomas, NVI/GSFC Schedule name: CA020.SKD on CDDIS Nominal Start: 18:00 U.T. on October 7 (day 280) first observation at 18:00 U.T. on 1044+719 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 October 8 (day 281) last observation at 17:57 U.T. on 1739+522 for MA last observation at 17:58 U.T. on 1815-553 for HH-HO last observation at 18:00 U.T. on 0552+398 for GC-WF Correlator: Washington **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) 451 40476601 HartRAO J HH 3 (HDT) 259 72326201 Hobart H HO 2 (HDT) 190 72425901 Matera I MA 3 (HDT) 387 72435701 Westford E WF 1 (TT) 427 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 Washington Correlator with all baselines being correlated. SKED Summary from file ./ca020.skd for experiment CA020 (all scans with at least one subnet station) SOURCE |0 6 12 18 | #SCANS #OBS #Obs/bl 0003-066I x xxxx x x x xx x xI 13 13 3.3 0048-097Ixx x x x x x x x xxxxx x x x I 17 29 7.1 0059+581Ixx x x xx x xx x xx x xx x xxx x xxxx xx xx xxx I 31 93 18.6 0104-408I xxxxx xxxxxx xI 12 18 5.8 0208-512I x x xx xx xx xI 9 9 3.7 0229+131I x xxx xxx x I 9 9 1.6 CTA26 I xx xx x I 5 5 1.3 0454-234Ixx xxxxxx x x x xxxxxxx I 18 28 9.4 0458-020I xx x xxx xx x xx x x x I 14 14 3.3 0528+134Ix xxx xx xxx xxxxxxxxxxx xx x xxxxxI 28 59 12.2 0537-441I x I 1 1 .3 0552+398I xxx x xxxxxxxxx xxx xxxxxx xx x xx xxI 29 60 9.8 0637-752Ix x x x x x x x x x I 10 10 4.1 0718+793I x x x x x x I 6 6 1.2 0727-115Ix xxxx xxxxx x xxxxx xxxI 20 26 9.1 0749+540Ix xx x xx xx xx x xx x xxx xx xx xxxx x x x I 28 78 15.9 0804+499I I 0 0 .0 0823+033Ix x x x xxxxxx xxxxx x I 16 18 3.9 OJ287 I I 0 0 .0 4C39.25 Ixxx xxx xxx x xxxx x xxx xxxxxxxx xxxxxx x x I 38 99 19.2 0955+476Ix xxx x xxx xx xx xx xx xx xxxxxxx x xxx xxx xxxI 35 77 16.6 1034-293I xxx xxxxx xxxx xx x I 15 21 6.9 1044+719I x x x x x x x x x x x x x x x x xx x x x x xI 23 69 13.8 1057-797I x x x x x x x x x I 9 9 3.7 1124-186I xx xx x x xxx I 9 11 3.7 1128+385Ixx xx xxx x x x xxxxxxxxxxx xxxxx I 26 47 5.8 1144-379I x xxxx x x I 7 7 2.4 1255-316I I 0 0 .0 1300+580I x x x x I 4 4 .8 1308+326I x x x xx xxxxx xxxxxxxx x xxxxxxxI 27 27 3.4 1334-127I I 0 0 .0 1357+769I x x x x x x x x x x x x x x x x x x x x xI 21 63 12.6 1424-418I xx xxx x xx x I 9 9 3.1 1606+106Ix xxxxxx xx x x xx x x x x xx xxxxxxxI 26 32 6.0 1610-771I x x x x x x x x x x I 10 10 4.1 NRAO512 Ix xxxxxxxx x x xx xx xx x xx xxxx xxxxxxxxxI 34 82 15.5 1739+522Ix x x xx xxxx x xx xxx xx xxxx xxxxx xxxxx xx xxI 35 95 19.9 1741-038Ixxx x xx xxxx x xxxx xxxx x xxxx x xx xxxxI 33 55 12.9 1815-553I x x xx I 4 4 1.6 1921-293I xxx xxx xxxxxxxxx x xxx I 19 19 6.5 1954-388I x xx xxxxxxxxxxx xxx I 17 17 5.7 1958-179I x x xxx x x x I 8 14 4.6 2005-489I I 0 0 .0 2052-474I I 0 0 .0 2145+067I xxx xxxx xx xx xx x x x xxx xx x x xxxx xI 29 35 7.1 2234+282I xxxx xxx x I 8 8 1.0 2255-282I x xx xI 4 4 1.4 Total scans, obs: 716 1294 Average number of obs. per baseline per source (normalized by up-time) = 6.0 Min = .0 Max = 47.4 (Baseline Gc-Ho on 0727-115) RMS = 9.5 Total time: 1442 minutes ( 24.0 hours). Key: Gc=GILCREEK Hh=HARTRAO Ho=HOBART26 Ma=MATERA Wf=WESTFORD Gc Hh Ho Ma Wf Avg % obs. time: 45 38 31 43 50 41 % cal. time: 5 2 2 4 4 3 % slew time: 27 37 26 18 19 25 % idle time: 21 20 40 33 25 28 # of tapes : .8 2.3 2.0 2.6 .9 total # scans: 451 259 190 387 427 342 # scans/hour : 18 10 7 16 17 14.3 Avg scan (sec): 87 128 141 96 102 110 # OF OBSERVATIONS BY BASELINE | Gc Hh Ho Ma Wf StnTotal ---------------------------------- Gc|451 22 41 249 376 477 Hh| 259 141 139 38 438 Ho| 190 26 9 438 Ma| 387 253 909 Wf| 427 326 Number of 2-station scans: 448 Number of 3-station scans: 254 Number of 4-station scans: 14 Number of 5-station scans: 0 Total # of scans, observations: 716 1294 Average baseline components for all observations Average XY = 6021. Average XZ = 5963. Average YZ = 4716. Average length = 7186.