CORE-A017 (Continuous Observations of the Rotation of the Earth-A017) 1997 August 26 Notes prepared by Cynthia Thomas, NVI/GSFC Schedule name: CA017.SKD on CDDIS Nominal Start: 18:00 U.T. on August 26 (day 238) first observation at 18:00 U.T. on 1921-293 for HH-HO-WF first observation at 18:00 U.T. on 1958-179 for HH-HO Duration: 24 hours Nominal Stop: 18:00 U.T. on August 27 (day 239) last observation at 17:58 U.T. on 4C39.25 for GC-MA-WF last observation at 18:00 U.T. on 1954-388 for HH-HO 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 3 (HDT) 401 40476601 HartRAO J HH 3 (HDT) 271 72326201 Hobart H HO 2 (HDT) 210 72425901 Matera I MA 3 (HDT) 382 72435701 Westford E WF 1 (TT) 409 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 the middle of December 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 ./ca017.skd for experiment CA017 (all scans with at least one subnet station) SOURCE |0 6 12 18 | #SCANS #OBS #Obs/bl 0003-066I x x xx xxx xx x xxx xx x x I 19 19 4.5 0048-097I x xx xx x x x xx x xx I 14 26 6.5 0059+581Ix xx x x x x xx x x x x x x x xx x xx x xx x x I 26 78 15.6 0104-408Ixx x x x xxx xxxI 11 15 4.9 0208-512Ix xxx x xxx x xI 10 10 4.1 0229+131I x x xx x x x x I 8 8 1.5 CTA26 I x x x x xx x I 8 8 1.9 0454-234I xx xxx xxxxxxxx x xxxI 18 18 6.4 0458-020I xx x x xx x xx x x xx x x x xI 17 17 4.0 0528+134Ixxx x x xxx xxx xx xxxxx x xxxxx x x I 26 50 10.4 0537-441I x xx xx xx x xI 9 9 3.1 0552+398I xx x x xxx x xxxxx xxxx xxxxxxxx x xxxI 29 55 8.1 0637-752I x x x x x x x x x I 9 9 3.7 0718+793I x x x I 3 3 .6 0727-115I xxx xxx xxxx xx x x x xxx I 18 26 8.4 0749+540Ix xx x x xx x x xx x x xx x xxx x x xxxx xI 26 74 15.1 0804+499I x I 1 1 .2 0823+033I x x x xxx x x xxxxxx I 15 17 3.6 OJ287 I x x x x I 4 4 .6 4C39.25 I x xx xx xx xx x x xxx xxxx xxxxxx xx xxxI 30 66 9.5 0955+476I xxx x x xxx xxxxx x x xx x xx xx xx xxx x x xxxI 32 70 15.1 1034-293I x xxxxxx x x xx x x I 13 17 5.6 1044+719I 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 1057-797I x x x x x x x x I 8 8 3.3 1124-186I x xxx x x I 7 9 3.0 1128+385Ixx xxx xx xxxx x x x xx xxx xxxxx x xxxx I 29 64 8.8 1144-379I x xxxxx xxx x x x x x I 14 18 5.9 1255-316I x x xx x I 5 5 1.7 1300+580I x x I 2 2 .4 1308+326Ixxx x x xxx x x x x x x xxx xxI 19 27 3.4 1334-127Ix xxx xxx x xx xx x xx I 15 15 3.2 1357+769I x x x x x x x x x x x x x x x x x xI 18 54 10.8 1424-418I x x xx xx xx xx x I 11 13 4.3 1606+106Ixxx x x xxxxx xxxx x x x xx x x x xxI 25 25 4.7 1610-771I x x x x x x x x x x x I 11 11 4.5 NRAO512 Ixxx xxx xxxxx x xx x x x x xxx x xI 23 44 6.8 1739+522I xxxx xx xxx xxx xxx x x x xx xx x xxx x xxx xxxI 33 89 18.6 1741-038I xxx xxxxxxx xx xxx x x x xxxx xxxx xx x I 29 45 10.8 1815-553I xx x I 3 3 1.2 1921-293Ix xx xxx xx x x xxx x x I 15 19 6.2 1954-388I x x xxxxx x xx xx I 12 12 4.0 1958-179Ix x xxxxxxxx xx x x I 14 14 5.1 2005-489I I 0 0 .0 2052-474I I 0 0 .0 2145+067Ix xxxxxxxxxxxx xxx xx x x x x x xxxx x x xxx I 32 40 8.2 2234+282I x x xx xx x x x I 9 9 1.2 2255-282Ix xx xx x xx xxI 10 16 5.2 Total scans, obs: 711 1205 Average number of obs. per baseline per source (normalized by up-time) = 5.6 Min = .0 Max = 37.9 (Baseline Gc-Ho on 0727-115) RMS = 8.2 Total time: 1441 minutes ( 24.0 hours). Key: Gc=GILCREEK Hh=HARTRAO Ho=HOBART26 Ma=MATERA Wf=WESTFORD Gc Hh Ho Ma Wf Avg % obs. time: 42 37 31 47 50 41 % cal. time: 4 3 2 4 4 3 % slew time: 24 37 30 18 18 25 % idle time: 27 21 35 29 26 28 # of tapes : 2.6 2.3 2.0 2.8 .8 total # scans: 401 271 210 382 402 333 # scans/hour : 16 11 8 15 16 13.9 Avg scan (sec): 92 120 131 106 108 111 # OF OBSERVATIONS BY BASELINE | Gc Hh Ho Ma Wf StnTotal ---------------------------------- Gc|401 9 45 222 330 415 Hh| 271 157 128 31 409 Ho| 210 21 11 406 Ma| 382 251 866 Wf| 402 314 Number of 2-station scans: 473 Number of 3-station scans: 232 Number of 4-station scans: 6 Number of 5-station scans: 0 Total # of scans, observations: 711 1205 Average baseline components for all observations Average XY = 6066. Average XZ = 5976. Average YZ = 4668. Average length = 7214.