CORE-B403 (Continuous Observations of the Rotation of the Earth-B403) 1999 May 5 Notes prepared by Cynthia Thomas and Nancy Vandenberg,NVI/GSFC Schedule name: CB403.SKD on CDDISA Nominal Start: 18:30 U.T. on May 5 (day 125) first observation at 18:30 U.T. on 1053+815 Nominal Stop: 18:30 U.T. on May 6 (day 126) last observation at 18:23 U.T. on 0119+115 for GC-KK last observation at 18:26 U.T. on 0823+033 for SM-MC-NY-WF 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 Crimea C SM 2 (HDT) 137 73323401 Fairbanks A GC 1 (TT) 306 40476601 Kokee K KK 1 (TT) 238 72983001 Medicina B MC 3 (HDT) 256 72308801 Ny Alesund N NY 1 (TT) 287 73313301 Westford E WF 1 (TT) 275 72097301 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 first three quarters of the year 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 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. 6) This schedule was made using 33 sources which helped improve the sky coverage. Station Information =================== Fairbanks will record this experiment on thin tapes in low density. There are only 3 MKIV drives at Haystack, so Ny Alesund, Westford, and Kokee will record on thin tapes in high density. 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 | 90.49| UT1-TAI | 60% | | | | | | |Y-Wobble | 76.55| ------- | under 40% | | | | | | |UT1-TAI | 2.62| X-Wobble | 60% | | | | | | |UT1-TAI Rate| 6.10| ------- | 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 ==== ========== 98DEC15 NEOS-A294 98DEC15 CORE-A051 98DEC16 CORE-B212 98DEC22 NEOS-A295 98DEC28 CORE-B312 98DEC29 NEOS-A296 98DEC29 CORE-A052 99JAN05 NEOS-A297 99JAN13 CORE-B401 99JAN19 NEOS-A299 99JAN26 CORE-A054 99JAN27 CORE-B501 99FEB01 EUROPE-47 99MAR16 NEOS-A307 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 ./cb403.skd for experiment CB403 (all scans with at least one subnet station) SOURCE |0 6 12 18 | #SCANS #OBS #Obs/bl 0003-066I xxxx x xx x I 8 18 3.6 0048-097I x x I 2 4 .9 0059+581I xx xxx xx x xx x x x xx xx xx x xx x x x xI 26 280 21.2 0106+013I I 0 0 .0 0119+115I xx x xx xx x x xxxx xxxx xx xx xI 22 95 11.4 0229+131I I 0 0 .0 0235+164I I 0 0 .0 0458-020I x x x x x x xxI 8 16 2.5 0528+134Ix xx xxx x xx xx xx xxx xx xxx xx xxx xx xI 29 109 12.8 0718+793I x x x x I 4 15 1.0 0727-115Ix x x x x x x xI 8 8 2.3 0749+540I x x x x x xxx x x x x xx xx x xxx xx x x xx x xI 28 297 23.3 0804+499I x I 1 10 .8 0823+033I x xxx x x x x xx x xx x I 14 44 6.4 4C39.25 Ix xx xx xx xxxxx xx x x xxx x x xxxx x x x xxx xI 32 232 20.7 OK290 I xxx x xxx x x I 9 24 2.5 0955+476Ix x xx xx xx xxx xx x xx xx x xx x xx I 24 200 16.6 1044+719Ix x x x x x x x x x x x x x I 14 180 12.3 1053+815I x x x x x x x I 7 100 6.7 1144-379I x I 1 1 .3 1219+044I x x x x I 4 12 1.7 1308+326Ix xx x x xxxx x x x xx x I 15 38 3.8 1334-127I x x x x x I 5 5 1.6 1357+769I x x x x x x x x x x x I 11 155 10.3 1606+106I x xx xxx xxx xx x x x xxx xx x x xxI 23 94 11.7 1739+522I xx xxx x xxxx xx x x x x xx xxx x xx x xx x xI 29 294 23.2 1741-038I xx xx x xx x xxxx xx xx x xI 18 46 7.3 1749+096I x x xx x xI 6 12 1.5 2121+053I x x x x xxxxx x xx xx xx xxx xx I 21 75 10.3 2128-123I xx x x I 4 4 1.8 2134+00 I I 0 0 .0 2145+067I x x x x x I 5 19 2.6 2234+282I x x xxx x x xxxx x I 12 52 5.0 Total scans, obs: 390 2439 Average number of obs. per baseline per source (normalized by up-time) = 7.0 Min = .0 Max = 31.9 (Baseline Gc-Ny on 4C39.25 ) RMS = 8.7 Total time: 1438 minutes ( 24.0 hours). Key: Sm=CRIMEA Gc=GILCREEK Kk=KOKEE Mc=MEDICINA Ny=NYALES20 Wf=WESTFORD Sm Gc Kk Mc Ny Wf Avg % obs. time: 21 31 41 33 36 42 34 % cal. time: 1 3 2 2 3 3 2 % slew time: 25 23 14 34 18 14 21 % idle time: 51 41 40 28 41 39 40 # of tapes : 1.4 .9 .7 2.1 .6 .7 total # scans: 137 306 238 256 287 275 249 # scans/hour : 5 12 9 10 11 11 10.4 Avg scan (sec): 138 87 150 112 110 132 121 # OF OBSERVATIONS BY BASELINE | Sm Gc Kk Mc Ny Wf StnTotal -------------------------------------- Sm|137 93 41 136 135 103 599 Gc| 306 227 183 221 226 725 Kk| 238 104 147 172 873 Mc| 256 243 199 768 Ny| 287 209 943 Wf| 275 970 Number of 2-station scans: 69 Number of 3-station scans: 100 Number of 4-station scans: 80 Number of 5-station scans: 105 Number of 6-station scans: 36 Total # of scans, observations: 390 2439 Average baseline components for all observations Average XY = 5333. Average XZ = 4551. Average YZ = 3493. Average length = 5691.