******************* NEW FREQUENCY SEQUENCE ****************** CORE-A012 (Continuous Observations of the Rotation of the Earth-A012) 1997 June 17 Notes prepared by Cynthia Thomas, NVI/GSFC Schedule name: CA012.SKD on CDDIS Nominal Start: 18:00 U.T. on June 17 (day 168) first observation at 18:00 U.T. on 1741-038 for HH-HO-MA first observation at 18:00 U.T. on 1300+580 for GC-WF Duration: 24 hours Nominal Stop: 18:00 U.T. on June 18 (day 169) last observation at 17:59 U.T. on 0048-097 for HO last observation at 17:59 U.T. on 1124-186 for HH last observation at 18:04 U.T. on 4C39.25 for GC-MA-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 3 (HDT) 402 40476601 HartRAO J HH 3 (HDT) 271 72326201 Hobart H HO 2 (HDT) 217 72425901 Matera I MA 3 (HDT) 376 72435701 Westford E WF 1 (TT) 400 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 ./ca012.skd for experiment CA012 (all scans with at least one subnet station) SOURCE |0 6 12 18 | #SCANS #OBS #Obs/bl 0003-066I xx x x x xx x x x xx x xxI 17 17 4.1 0048-097I x x xx x xxx x x x xx x x xx I 19 31 8.2 0059+581Ixx x x x xx xx x x xx x x x xx x x xx x x xx xx I 28 84 16.8 0104-408I xxx xxxxx x x x x xI 13 15 4.9 0208-512I x xx xx xxxx x x I 11 11 4.5 0229+131I x x xxx xx xx I 9 9 1.7 CTA26 I x x x xxx xx x I 9 9 2.1 0454-234I xx xxxx xxx xx x xxxx I 17 17 6.4 0458-020I xx xx x xxx xx x x xxx xx x I 18 18 4.1 0528+134I I 0 0 .0 0537-441I x xx xxxxx xxx I 11 11 3.8 0552+398Ixxx xxx xx x x xxx xxx xxx xxxx xx xxxx I 29 60 9.4 0637-752I x x x x x x x x x I 9 9 3.7 0718+793I x x I 2 2 .4 0727-115Ixx xxx x xx xxx xxxxx I 16 16 7.0 0749+540I xx xx xx xx x x xx x x x x xx x x x xx xx xxI 27 77 15.7 0804+499I x xI 2 2 .4 0823+033I x x x xxx xxxxxx xxxxI 17 19 4.0 OJ287 I x x x I 4 4 .6 4C39.25 Ix xxx xxx x xxx xx x xx x x xxx xx xxxxxxxxxI 33 81 12.1 0955+476Ix xx x xx x xx x xx x xxx xx xxx x x xxxxxx x I 31 69 14.9 1034-293I xxx xxx x x xxx x xI 13 17 5.9 1044+719Ix x x x x x x x x x x x x x x x x x x x x I 21 63 12.6 1057-797I x x x x x x x x I 8 8 3.3 1124-186I xxxx x x I 6 8 2.7 1128+385Ixx xx x xx xx x xxx xx x x x xxxxxxxI 25 55 7.2 1144-379Ix x xxxx xxx xx xx x I 14 18 5.9 1255-316I xx x xx x I 6 6 2.0 1300+580I x x x x I 4 4 .8 1308+326I xxx xx xxxxxx xxx xx x x xxx xx x x I 25 37 5.1 1334-127I x x xx xxxxxx xxxxx xxxx I 19 19 5.2 1357+769I x x x x x x x x x x x x x x x x xI 17 51 10.2 1424-418I xxx xxxxx xxx xx I 13 17 5.6 1606+106I xx xx xxxxxxxx xxxx x xx x x xx xx x I 27 35 6.6 1610-771Ix x x x x x x x x x x I 11 11 4.5 NRAO512 I xx x x xxxxxxx xx xxx xx x x x I 22 40 5.7 1739+522Ixxx xx xxx x xx xx xx xxx xx xx x x x xx xxx xx I 33 89 18.6 1741-038Ixx xxxx x xxxx xx x xx xxxx xxx xxx xxxxxI 32 54 12.5 1815-553Ixx x I 3 3 1.2 1921-293Ixxxxx x xx x xxxx x x I 15 19 6.5 1954-388I x x x xxxxxxxx I 11 11 3.6 1958-179Ix x x xxxxxxxx xI 13 13 4.6 2005-489I I 0 0 .0 2052-474I I 0 0 .0 2145+067Ix x x xx xx xx xxx x xx xxxx xxxx x x xxxxxxI 31 39 8.0 2234+282I x x xxx xx xx I 9 9 1.2 2255-282I x xx xx xxxxx xx I 12 16 5.2 Total scans, obs: 712 1203 Average number of obs. per baseline per source (normalized by up-time) = 5.6 Min = .0 Max = 47.4 (Baseline Gc-Ho on 0727-115) RMS = 8.6 Total time: 1446 minutes ( 24.1 hours). Key: Gc=GILCREEK Hh=HARTRAO Ho=HOBART26 Ma=MATERA Wf=WESTFORD Gc Hh Ho Ma Wf Avg % obs. time: 42 36 30 45 50 40 % cal. time: 4 3 2 4 4 3 % slew time: 24 38 30 18 19 26 % idle time: 28 21 36 31 26 28 # of tapes : 2.6 2.2 1.9 2.7 .8 total # scans: 402 271 217 376 400 333 # scans/hour : 16 11 9 15 16 13.9 Avg scan (sec): 91 116 121 105 108 108 # OF OBSERVATIONS BY BASELINE | Gc Hh Ho Ma Wf StnTotal ---------------------------------- Gc|402 9 47 226 333 416 Hh| 271 162 118 27 412 Ho| 217 15 13 404 Ma| 376 253 866 Wf| 400 308 Number of 2-station scans: 477 Number of 3-station scans: 228 Number of 4-station scans: 7 Number of 5-station scans: 0 Total # of scans, observations: 712 1203 Average baseline components for all observations Average XY = 6103. Average XZ = 5953. Average YZ = 4614. Average length = 7198.