CORE-B701 (Continuous Observations of the Rotation of the Earth-B701) 2000 May 10 Notes prepared by Cynthia Thomas and Nancy Vandenberg,NVI/GSFC Schedule name: CB701.SKD on CDDISA Nominal Start: 18:30 U.T. on May 10 (day 131) first observation at 18:30 U.T. on 1749+096 for SM-NY-TS first observation at 18:30 U.T. on 0552+398 for AP-YK-65-FT Nominal Stop: 18:30 U.T. on May 11 (day 132) last observation at 17:58 U.T. on 0552+398 for YK last observation at 18:09 U.T. on 0804+499 for SM last observation at 18:12 U.T. on 1606+106 for NY-TS last observation at 18:14 U.T. on 0727-115 for 65 last observation at 18:18 U.T. on 0454-234 for AP-FT Correlator: Haystack **Frequency Sequence**: CDPSX - Standard CDP SX sequence. (360 MHz wide at X, 85 MHz wide at S) 1 letter 2 letter Station Code Code # of tapes # of obs Occupation Code Algonquin G AP 2 (HDT) 242 72828201 Yellowknife X YK 2 (HDT) 148 72965101 Crimea C SM 2 (HDT) 162 73323401 DSS65 M 65 1 (TT) 273 13313301 Fortaleza F FT 1 (HDT) 139 72974801 Ny Alesund N NY 1 (TT) 267 73313301 Tsukuba T TS 1 (TT) 218 73452301 Purpose ======= The purpose of the CORE-B sessions is to obtain EOP data on days adjacent to the main NEOS/CORE-A and CORE-3 sessions and thus extend the span of continuous data. The secondary purpose of CORE-B is to provide observing sessions during which the stations can demonstrate their performance and their ability to participate in future regular CORE sessions. The CORE-B networks are numbered 7 and 8 to distinguish them from the networks used in 1999. Schedule ======== This is a new schedule generated by C. Thomas with the automatic mode of sked. The characteristics of the CORE-B schedules have changed slightly. Changes were made to smooth out the distribution of observations over the sky. Following are the characteristics of the CORE-B schedule file: 1) This schedule was optimized for sky coverage. 2) Only the observations in the previous 2 hours of the schedule were considered for the minor options. The best 60% 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 thirty minutes. 5) The minimum SNR limits for the baselines were set to 20 for X-band and 15 for S-band, with the exception of the Yellowknife baselines. The minimum SNR limits for the Yellowknife baselines were set to 15 for X-bannd and 12 for S-band. 6) This schedule was made using 66 sources which helped improve the sky coverage. Simulation Results ================== Simulated data from this schedule was used in a global solution to estimate the formal errors. The table below lists the formal errors for Earth orientation parameters. These results meet the simulation goals for the CORE-B network. Also shown in the table are the maximum correlations between the Earth orientation parameters and other parameters. ____________________________________________ | | | | | | EOP |Formal| Other | | |Parameters |Errors|Parameters|Correlation| |____________|______|_________ |___________| | | | | | |X-Wobble | 85.86| ------- | Under 40% | | | | | | |Y-Wobble | 75.73| ------- | under 40% | | | | | | |UT1-TAI | 2.87| ------- | under 40% | | | | | | |UT1-TAI Rate| 4.42| ------- | under 40% | | | | | | ____________________________________________ 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 following databases: Date Experiment ==== ========== 99NOV02 CORE-A074 99NOV02 NEOS-A340 99NOV09 NEOS-A341 99NOV16 NEOS-A342 99NOV30 NEOS-A344 99DEC14 NEOS-A346 99DEC21 NEOS-A347 99DEC28 NEOS-A348 Procedures ========== Please generate the procedures for this session using drudg. Correlation ========== This experiment will be correlated at the Haystack Correlator with all baselines being correlated. SKED Summary from file ./cb701.skd for experiment CB701 (all scans with at least one subnet station) SOURCE |0 6 12 18 | #SCANS #OBS #Obs/bl 0003-066I x x xx x x x x x x I 10 28 3.5 0048-097I x x x x x I 5 9 1.2 0059+581I x x x x x x x x xI 9 74 3.8 0104-408I x x I 2 2 3.0 0106+013I x x x x x x x x xx xx I 12 55 5.9 0119+115I x xx x x x x x xx x xI 12 25 2.1 0119+041I x x I 2 4 .4 0208-512I I 0 0 .0 0229+131I I 0 0 .0 0235+164I I 0 0 .0 CTA26 I x x x x xx x x x x I 10 27 3.0 0402-362I x I 1 1 .5 0454-234I x x x x x xx x x I 9 15 3.5 0458-020I xx x x x xxI 7 16 1.8 0530-727I I 0 0 .0 0528+134Ix x x x xxxx xxxx xxx x x xx x x x I 22 74 6.5 0537-441I I 0 0 .0 0552+398I x x xx x x xx xx xx xxx xx xx x xx xx x xx x xI 29 292 18.7 0556+238I x xx x x xx x x x x x I 12 41 3.3 0637-752I I 0 0 .0 0718+793I x x x x x x x x I 8 48 2.3 0727-115I x x x x x x xx x I 9 24 3.4 0749+540Ixx x x x x x x x x xx x x x x I 16 169 9.2 0804+499I x x I 2 12 .7 0805+410I x x x x xI 5 27 1.8 0823+033Ix x x x xxx xx x x x x x xx I 16 37 3.9 OJ287 I xx x xx xx x x x x x xI 13 53 4.4 0919-260I I 0 0 .0 0920-397I I 0 0 .0 4C39.25 Ix x x x xx xx xx xx x x x x x x x x xI 21 198 12.6 OK290 I xx x x xx x x xI 9 22 1.7 0955+476I x x x x x x x x x x I 10 84 4.8 1034-293I x x x I 3 3 1.0 1044+719I x x x x x x x x x x I 10 121 5.8 1053+815I x x x x x x x I 7 55 2.9 1057-797I I 0 0 .0 1104-445I I 0 0 .0 1124-186I x x x I 3 7 1.1 1128+385I x x x x x x I 6 33 2.4 1144-379I x I 1 1 .6 1219+044I xx xx xxx x xx x x x x I 14 53 5.5 1255-316I x x I 2 2 .7 1300+580I x x x x x x x I 7 51 2.6 1334-127I xx x x x x x x x I 9 15 2.1 1351-018I x x x x x x x I 7 18 5.5 1357+769I x x x x x x x x x I 9 121 6.5 1424-418I I 0 0 .0 1451-375I x I 1 1 .6 1606+106I x x x xx x xx x xx x x x xxx x x x I 20 67 6.3 1622-253I x x x x xxx I 7 11 2.8 NRAO512 Ix x x x x x xx x x x I 11 56 3.7 1726+455I x x x x x x x x I 8 26 1.6 1739+522I x I 1 6 .3 1741-038I x x x xxx xx xxxx x x x I 15 35 4.0 1749+096Ix x x xx xx x x x x I 11 78 7.4 1815-553I I 0 0 .0 1908-201I x x xx xxx x x x I 10 22 3.5 1954-388I x x x I 3 3 2.0 1958-179I x x I 2 4 .6 2005-489I I 0 0 .0 2052-474I I 0 0 .0 2121+053I I 0 0 .0 2128-123I I 0 0 .0 2134+00 I I 0 0 .0 2145+067I I 0 0 .0 2255-282I I 0 0 .0 Total scans, obs: 418 2126 Average number of obs. per baseline per source (normalized by up-time) = 3.2 Min = .0 Max = 75.8 (Baseline Ny-Ts on 1351-018) RMS = 5.4 Total time: 1430 minutes ( 23.8 hours). Key: Ap=ALGOPARK Yk=ARIES_9M Sm=CRIMEA 65=DSS65 Ft=FORTLEZA Ny=NYALES20 Ts=TSUKUB32 Ap Yk Sm 65 Ft Ny Ts Avg % obs. time: 22 23 22 25 16 36 27 25 % cal. time: 2 1 1 3 1 3 2 2 % slew time: 56 18 24 44 22 13 10 27 % idle time: 18 56 51 26 59 46 59 45 # of tapes : 1.4 1.4 1.4 .5 1.0 .6 .5 total # scans: 242 148 162 273 139 267 218 207 # scans/hour : 10 6 6 11 5 11 9 8.6 Avg scan (sec): 79 134 121 81 104 117 107 106 # OF OBSERVATIONS BY BASELINE | Ap Yk Sm 65 Ft Ny Ts StnTotal ------------------------------------------ Ap|242 85 94 171 98 166 99 713 Yk| 148 44 67 27 91 118 432 Sm| 162 150 49 142 77 556 65| 273 108 205 113 814 Ft| 139 45 10 337 Ny| 267 167 816 Ts| 218 584 Number of 2-station scans: 123 Number of 3-station scans: 104 Number of 4-station scans: 99 Number of 5-station scans: 59 Number of 6-station scans: 31 Number of 7-station scans: 2 Total # of scans, observations: 418 2126 Average baseline components for all observations Average XY = 5400. Average XZ = 4358. Average YZ = 4280. Average length = 5942.