THIS IS A NEW FILE WITHOUT HARTRAO!!!!! CORE-A047 (Continuous Observations of the Rotation of the Earth-A047) 1998 October 20 Notes prepared by Cynthia Thomas, NVI/GSFC Schedule name: CA047.SKD on CDDISA Nominal Start: 18:00 U.T. on October 20 (day 293) first observation at 18:00 U.T. on 0229+131 for HO-MA first observation at 18:00 U.T. on 4C39.25 for AP-GC-WF Duration: 24 hours Nominal Stop: 18:00 U.T. on October 21 (day 294) last observation at 17:57 U.T. on 0727-115 for HO last observation at 18:02 U.T. on 1606+106 for AP-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 Algonquin G AP 2 (HDT) 319 72828201 Fairbanks A GC 1 (TT) 341 40476601 Hobart H HO 1 (HDT) 78 72425901 Matera I MA 3 (HDT) 260 72435701 Westford E WF 1 (TT) 353 72097301 Purpose ======= The CORE-A sessions measure EOP simultaneously with NEOS, using an independent network of comparable or better precision. The purpose of the parallel sessions is to assess the true accuracy of VLBI results for EOP by comparing the measurements from the two networks. Note on Core-A 1998 results to date: As of early January 1998, 18 CORE-A sessions from 1997 have been completed and analyzed. The comparisons of the EOP results from these sessions with NEOS are quite encouraging. The levels of agreement for daily measurements are 125 micro-arcsec for X-pole, 105 micro-arcsec for Y-pole, and 7.4 microsec for UT1 and 20 microsec for LOD. The corresponding Chi-squares per degree of freedom are 1.2, 1.3, 2.2, and 2.4, respectively. The goals for EOP in the Mark IV era are 25 micro-arcsec for the pole components and 1 microsec for UT1. (No goal for LOD has been set.) We have a lot of work remaining, but these goals are not out of reach. 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 59 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 98Mar03 NEOS-A253 and the 98JAN27XA CORE-A028 experiments. Station Information =================== Matera's SEFD at S-band has been changed from 850 to 1300 for this experiment. HartRAO will not participate in this experiment because the electric drive will be upgraded during this experiment. Procedures ========== Please use the modified CDP Wide-band SX sequence, CDP-WBCA, for this experiment. Please generate the procedure for this session using drudg. Correlation ========== This experiment will be correlated at the Washington Correlator with all baselines being correlated. SKED Summary from file ./ca047.skd for experiment CA047 (all scans with at least one subnet station) SOURCE |0 6 12 18 | #SCANS #OBS #Obs/bl 0003-066I xx x x x I 5 11 2.9 0048-097I xx x x xx x x x x I 10 16 4.6 0059+581I x x x x x x x x x x x x xx xxxx x xx x xI 23 126 15.8 0104-408I x x I 2 2 .9 0106+013I x x x x I 4 4 .9 0119+115I x xxxx x x x x x I 10 33 6.2 0119+041I x I 1 3 .6 0208-512I I 0 0 .0 0229+131Ix x x x x x x I 7 13 2.5 0235+164Ix x I 2 2 .4 CTA26 I x x x x I 4 6 1.4 0402-362I x x I 2 2 1.0 0454-234I x x xx I 4 4 1.5 0458-020I x x x x x xx x I 8 14 3.4 0530-727I I 0 0 .0 0528+134I x x x x x x x x x xx x I 12 27 5.3 0537-441I I 0 0 .0 0552+398Ix x x xx x x x x x x x x x xx x x xx xxx I 24 86 13.9 0556+238I x x x x x x I 6 17 2.7 0637-752I I 0 0 .0 0718+793I I 0 0 .0 0727-115Ix x x x x x xx xx I 10 12 5.9 0749+540I x xx x x xx x x x x x x x x x x x x xI 20 111 14.0 0804+499I x I 1 6 .8 0805+410I x x x x xx x x x x x x x x x x x x x x I 20 71 11.3 0823+033I x x x x x xx xx I 9 28 6.2 OJ287 I x x x I 3 3 .5 0919-260I x x I 2 2 1.3 0920-397I I 0 0 .0 4C39.25 Ix x x x x x x x xx x xx x x x x xx x x x x I 23 78 10.1 OK290 I x x x x xx I 6 10 1.7 0955+476Ix x x xx x x x x x x x x x x x x I 17 67 9.7 1034-293I x I 1 1 .8 1044+719I x x x x x x x x x x x x x x x x x x x xI 20 108 13.5 1053+815I I 0 0 .0 1057-797I I 0 0 .0 1104-445I I 0 0 .0 1124-186I x x x x x I 5 7 3.0 1128+385Ix x x x x x x I 7 16 2.0 1144-379I x I 1 1 .5 1219+044I x x x x x I 5 11 2.4 1255-316I x x I 2 2 2.0 1300+580I x x x I 3 7 .9 1308+326Ixx xx x x x x x x x I 11 19 2.6 1313-333I x I 1 1 1.4 1334-127I I 0 0 .0 1351-018I I 0 0 .0 1357+769I x x x x x x x x x x x x x x x x x xI 18 105 13.1 1424-418I I 0 0 .0 1451-375I I 0 0 .0 1606+106Ix x x xxx x x x x x x x xxx x xI 19 56 10.9 1610-771I I 0 0 .0 1622-253I x x x x x I 5 5 2.7 NRAO512 I x x x x x x x x x x x xx x x xx x xI 19 71 11.5 1726+455I x I 1 6 .9 1739+522I x x x xx x x x x x x x x x xx x x x x x xI 22 113 15.0 1741-038I x x xxxx x x x x xx x x x x xx xxI 20 41 10.3 1749+096I x x x x x x x x x x x xxxxx I 16 44 8.9 1815-553I I 0 0 .0 1908-201Ix x x x x I 5 5 2.4 1921-293I xx x x x x I 6 8 4.7 1954-388I I 0 0 .0 1958-179Ix xx x x x I 6 8 3.2 2005-489I I 0 0 .0 2052-474I I 0 0 .0 2121+053I x I 1 1 .2 2128-123I x x x x x I 5 9 2.4 2134+00 I x x x I 3 3 .7 2145+067Ix x x x xx x x xx x x x x x x I 16 42 8.6 2234+282I xx x x x I 5 13 2.0 2255-282I x x xx I 4 4 1.8 Total scans, obs: 462 1461 Average number of obs. per baseline per source (normalized by up-time) = 4.2 Min = .0 Max = 38.1 (Baseline Gc-Ho on 0727-115) RMS = 6.6 Total time: 1443 minutes ( 24.1 hours). Key: Ap=ALGOPARK Gc=GILCREEK Ho=HOBART26 Ma=MATERA Wf=WESTFORD Ap Gc Ho Ma Wf Avg % obs. time: 26 41 16 37 44 33 % cal. time: 3 3 0 3 4 3 % slew time: 54 20 11 16 14 23 % idle time: 15 34 71 43 37 40 # of tapes : 1.7 .7 1.0 2.3 .8 total # scans: 319 341 78 260 353 270 # scans/hour : 13 14 3 10 14 11.3 Avg scan (sec): 71 105 178 126 107 117 # OF OBSERVATIONS BY BASELINE | Ap Gc Ho Ma Wf StnTotal ---------------------------------- Ap|319 241 7 166 311 817 Gc| 341 50 192 258 483 Ho| 78 26 7 372 Ma| 260 203 756 Wf| 353 494 Number of 2-station scans: 180 Number of 3-station scans: 137 Number of 4-station scans: 145 Number of 5-station scans: 0 Total # of scans, observations: 462 1461 Average baseline components for all observations Average XY = 4757. Average XZ = 3872. Average YZ = 3694. Average length = 5182.