CORE-B602 (Continuous Observations of the Rotation of the Earth-B602) 1999 May 19 Notes prepared by Cynthia Thomas and Nancy Vandenberg,NVI/GSFC Schedule name: CB602.SKD on CDDISA Nominal Start: 18:30 U.T. on May 19 (day 139) first observation at 18:30 U.T. on 1958-179 for KK-TS first observation at 18:30 U.T. on 0552+398 for AP-YK-FT-ON first observation at 22:35 U.T. on 4C39.25 for 65 Nominal Stop: 18:30 U.T. on March 11 (day 140) last observation at 18:12 U.T. on 1749+096 for KK-TS last observation at 18:17 U.T. on 4C39.25 for YK last observation at 18:27 U.T. on 0727-115 for AP-65-FT-ON 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) 211 72828201 Yellowknife X YK 2 (HDT) 115 72965101 DSS65 M 65 1 (TT) 185 16658501 Fortaleza F FT 2 (HDT) 148 72974801 Kokee K KK 1 (TT) 228 72983001 Onsala T ON 3 (HDT) 179 72137701 Tsukuba U TS 1 (TT) 241 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. 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 34 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 | 64.61| UT1-TAI | 47% | | | | | | |Y-Wobble | 58.27| Tsukuba Z| 40% | | | | | | |UT1-TAI | 2.34| X WOBBLE | 47% | | | | | | |UT1-TAI Rate| 5.65| ------- | 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 ./cb602.skd for experiment CB602 (all scans with at least one subnet station) SOURCE |0 6 12 18 | #SCANS #OBS #Obs/bl 0048-097Ix xx x x x xx x x x I 11 21 2.6 0059+581Ix x x x x x x x x x x x xx I 14 157 9.4 0119+115Ixx x x xx x I 7 11 1.0 CTA26 I xx x x x xx x x x x x x x I 14 20 2.2 0402-362I x x x x x x x xI 8 8 3.3 0528+134I xxx xxx x x x xx x xx x x xx xx xI 21 75 6.8 0552+398Ixx x x x x xx x xx xx xx x xx x xxx x x x x I 26 248 16.1 0718+793Ix x x x I 4 4 .2 0727-115I xxx x xxx x x x x x x x xxx xx x xI 21 53 6.7 0749+540I x x x x x x x x x x x x x x x I 15 78 4.3 0805+410I x x x x x x x I 7 20 1.4 0823+033I x x x x x xxx x xx x x I 13 19 2.0 OJ287 I x x xx x xx x x x xx x xI 14 33 2.8 0919-260I x x x I 3 3 .5 4C39.25 I x x x x x x x x x x x xx xx xx x x x xI 21 211 13.9 OK290 I x x x x x x xI 7 7 .6 1034-293I xx x xx x xI 7 7 2.1 1044+719Ix x x x x x x x x I 9 56 2.7 1053+815I x x x x x I 5 22 1.2 1124-186I xx x x x xx x xx x xI 12 20 2.8 1128+385I x x x x x I 5 16 1.2 1219+044I x x x x x x xx x x x I 11 17 1.7 1357+769Ix x x x x x x x x x I 10 89 4.8 1606+106I x x x xx x xx x I 9 9 .8 1622-253I x x x x x x x x xI 9 11 2.2 NRAO512 I x xx x x xx x x x x I 11 71 5.1 1739+522I x x x x x x x x x x x x x x I 14 170 9.8 1741-038Ix xx x xxx x x x x xx x xx x x x x x xx I 23 89 10.1 1749+096I x xx x x x x xx xx xx x x xx x x xI 20 109 10.4 1921-293I xx x x x xx x xx x I 11 13 3.1 1958-179Ix x x x x x x x x xx xx x I 14 16 2.0 2121+053I xx x x x x x xxx x I 11 29 2.9 2128-123I x xx x x x x I 7 11 1.4 2145+067I xx x x xx xx x x x x x I 13 52 5.2 Total scans, obs: 407 1775 Average number of obs. per baseline per source (normalized by up-time) = 4.3 Min = .0 Max = 27.3 (Baseline Ap-Yk on 0552+398) RMS = 5.8 Total time: 1439 minutes ( 24.0 hours). Key: Ap=ALGOPARK Yk=ARIES_9M 65=DSS65 Ft=FORTLEZA Kk=KOKEE On=ONSALA60 Ts=TSUKUB32 Ap Yk 65 Ft Kk On Ts Avg % obs. time: 17 26 17 30 34 35 25 26 % cal. time: 2 1 2 1 2 2 2 2 % slew time: 54 18 28 22 13 14 23 25 % idle time: 24 54 52 45 48 47 48 45 # of tapes : 1.2 1.6 .3 2.0 .6 2.2 .5 total # scans: 211 115 185 148 228 179 241 186 # scans/hour : 8 4 7 6 9 7 10 7.8 Avg scan (sec): 72 195 81 177 132 172 90 131 # OF OBSERVATIONS BY BASELINE | Ap Yk 65 Ft Kk On Ts StnTotal ------------------------------------------ Ap|211 79 107 100 124 104 102 458 Yk| 115 44 42 81 70 73 503 65| 185 107 52 116 79 461 Ft| 148 31 71 19 587 Kk| 228 71 187 503 On| 179 116 543 Ts| 241 495 Number of 2-station scans: 164 Number of 3-station scans: 95 Number of 4-station scans: 72 Number of 5-station scans: 54 Number of 6-station scans: 18 Number of 7-station scans: 4 Total # of scans, observations: 407 1775 Average baseline components for all observations Average XY = 6073. Average XZ = 5267. Average YZ = 4417. Average length = 6696.