CORE-B504 (Continuous Observations of the Rotation of the Earth-B504) 1999 July 28 Notes prepared by Cynthia Thomas and Nancy Vandenberg,NVI/GSFC Schedule name: CB504.SKD on CDDISA Nominal Start: 18:30 U.T. on July 28 (day 209) first observation at 18:30 U.T. on 4C39.25 for KK-NT-GN-YB first observation at 18:30 U.T. on 1053+815 for SH-UR Nominal Stop: 18:30 U.T. on July 29 (day 210) last observation at 18:15 U.T. on 0805+410 for KK last observation at 18:18 U.T. on 1739+522 for SH-UR-YB last observation at 18:27 U.T. on 1124-186 for NT-GN 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 Kokee K KK 1 (TT) 271 72983001 Noto S NT 2 (HDT) 229 75478901 NRAO 20M N GN 1 (TT) 289 72484701 Seshan C SH 3 (HDT) 222 72336101 Urumqi U UR 3 (HDT) 249 73303201 Yebes Y YB 2 (HDT) 168 73333601 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. During the period of January through September CORE-B is observed on Wednesdays starting at 18:30 UT, following a NEOS session. Beginning on October 1 CORE-B is observed on Thursdays starting at 19:00 UT, following the CORE-3 sessions. The CORE-B networks are numbered 4, 5, and 6 to distinguish them from the networks used in 1998. 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 50% 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. 6) This schedule was made using 54 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 | 73.00| ------- | under 40% | | | | | | |Y-Wobble | 88.93| ------- | under 40% | | | | | | |UT1-TAI | 2.95| URUMQI X | 48% | | | | | | |UT1-TAI Rate| 5.23| ------- | 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 ==== ========== 99APR06 NEOS-A310 99APR06 CORE-A059 99APR13 NEOS-A311 99APR19 IRIS-S137 99APR20 NEOS-A312 99APR20 CORE-A060 99APR26 EUROPE-48 99APR27 NEOS-A313 99MAY03 IRIS-S138 99MAY04 NEOS-A314 99MAY05 CORE-B403 99MAY11 NEOS-A315 99MAY18 NEOS-A316 Station Information =================== Yebes was tagged along to this schedule file. 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 ./cb504.skd for experiment CB504 (all scans with at least one subnet station) SOURCE |0 6 12 18 | #SCANS #OBS #Obs/bl 0048-097I x x x x x xx xx xx x x xx xxx xx x xxI 23 46 7.1 0059+581Ix x x x xx x x xx x x x x x x x x I 18 200 16.3 0104-408I x x x x I 4 4 .9 0106+013I x I 1 1 .1 0119+115I x x xx x x xx xxx xx x x x x I 17 43 5.7 0119+041I x x x x xx x x I 8 12 1.7 0229+131I x I 1 1 .1 0235+164I x I 1 1 .1 CTA26 I x x x x x x x x x I 9 15 2.2 0402-362Ix x x x x x I 6 6 1.2 0454-234I x xx x x x x x x x x xx x x x xI 17 29 5.1 0458-020I x xx I 3 3 .4 0528+134I xxx x x x x x xx xx x xxx x x x xx xx x xI 25 56 7.3 0552+398Ixx x x x x xx xx x x xx xx x xx x xx x x xx x I 27 150 16.0 0556+238I I 0 0 .0 0718+793I I 0 0 .0 0727-115I x x x x xx x x x xx x xx x x x xx x xx xI 23 48 7.6 0804+499Ix x x x x x x x x x x x x xI 14 105 10.0 0805+410I x I 1 1 .1 OJ287 I I 0 0 .0 0919-260I I 0 0 .0 0920-397I x I 1 1 .2 4C39.25 I xx x x x x xx x xxx x x x x xx x x x x x xI 24 130 13.9 OK290 I x I 1 3 .4 0955+476I x x I 2 16 1.6 1034-293I x x x xx x x x x x I 10 12 2.3 1053+815I x x x x x x x x x I 9 15 1.0 1124-186I x x x x x x x xx xx x x xx x xx xxI 20 38 6.5 1128+385I x x I 2 4 .4 1144-379I xx x x x I 5 5 1.1 1219+044I xx x x x xx x x x x x xxI 14 31 4.3 1255-316I I 0 0 .0 1300+580I x I 1 3 .2 1308+326I x x x I 3 5 .6 1334-127I x x x x x x x x xx x xI 12 22 3.5 1351-018I x I 1 1 .1 1357+769I x x x x x x x x x x x I 11 150 10.0 1451-375I x x I 2 2 .5 1606+106I x xx x xx x x x x x xI 12 22 2.9 1622-253I x x xx x x xx xx x xxx x x xx I 18 26 4.7 1739+522Ixx x x xx x x x x x x x xx x x x x I 19 164 14.9 1741-038Ix x xx xx xx x x xx x xx x xx x xx xx x xx x I 27 57 8.4 1749+096I x x x xx x xx xx x xx x x x xx I 18 60 8.0 1908-201I x x x x x x x xx xx x x x xI 15 23 3.9 1921-293I x x x x x x xx x x x I 11 17 3.2 1954-388I x x x x x x I 6 6 1.2 1958-179I x I 1 1 .2 2121+053I x x x xx x x x xxxx x xx xx x x x x x xxI 24 60 8.3 2128-123Ix x x x x x x I 7 17 2.7 2134+00 I I 0 0 .0 2145+067I xx x x I 4 8 1.1 2234+282I xx x x x x x x x I 9 23 2.7 3C454.3 I I 0 0 .0 2255-282I x xx I 3 3 .6 Total scans, obs: 490 1646 Average number of obs. per baseline per source (normalized by up-time) = 3.5 Min = .0 Max = 24.2 (Baseline Sh-Ur on 4C39.25 ) RMS = 5.5 Total time: 1438 minutes ( 24.0 hours). Key: Kk=KOKEE Nt=NOTO Gn=NRAO20 Sh=SESHAN25 Ur=URUMQI Yb=YEBES Kk Nt Gn Sh Ur Yb Avg % obs. time: 34 32 43 33 34 28 34 % cal. time: 3 2 3 2 2 1 2 % slew time: 15 35 16 42 28 19 26 % idle time: 46 29 37 21 34 50 36 # of tapes : .6 1.9 .7 2.1 2.1 1.7 total # scans: 271 229 289 222 249 168 238 # scans/hour : 11 9 12 9 10 7 9.9 Avg scan (sec): 109 121 128 132 120 144 125 # OF OBSERVATIONS BY BASELINE | Kk Nt Gn Sh Ur Yb StnTotal -------------------------------------- Kk|271 53 187 127 101 45 513 Nt| 229 145 85 149 160 592 Gn| 289 59 81 122 594 Sh| 222 185 53 509 Ur| 249 94 610 Yb| 168 474 Number of 2-station scans: 219 Number of 3-station scans: 161 Number of 4-station scans: 59 Number of 5-station scans: 35 Number of 6-station scans: 16 Total # of scans, observations: 490 1646 Average baseline components for all observations Average XY = 6628. Average XZ = 4541. Average YZ = 4421. Average length = 6703.