CORE-B604 (Continuous Observations of the Rotation of the Earth-B604) 1999 August 23 Notes prepared by Cynthia Thomas and Nancy Vandenberg,NVI/GSFC Schedule name: CB604.SKD on CDDISA Nominal Start: 18:30 U.T. on August 23 (day 235) first observation at 16:00 U.T. on 4C39.25 for YK-FT first observation at 16:00 U.T. on 1357+769 for AP-15-KA-KK-ON Nominal Stop: 18:30 U.T. on August 24 (day 236) last observation at 15:41 U.T. on CTA26 for KA last observation at 15:54 U.T. on 4C39.25 for AP-YK-15-FT-KK-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) 233 72828201 Yellowknife X YK 1 (HDT) 104 72965101 DSS15 M 65 1 (TT) 271 72318701 Fortaleza F FT 2 (HDT) 138 72974801 Kashima-26m Q KA 2 (HDT) 221 18567601 Kokee K KK 1 (TT) 274 72983001 Onsala T ON 2 (HDT) 175 72137701 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, except for the Fortaleza and Yellowknife baselines. The baselines to Fortaleza and Yellowknife were set to 15 for X-band and 12 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 | 64.90| UT1-TAI | 49% | | | | | | |Y-Wobble | 69.89| ------- | under 40% | | | | | | |UT1-TAI | 3.23| X WOBBLE | 49% | | | | | | |UT1-TAI Rate| 8.02| -------- | 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 ==== ========== 99MAY03 IRIS-S138 99MAY04 NEOS-A314 99MAY05 CORE-B403 99MAY11 NEOS-A315 99MAY18 NEOS-A316 99MAY18 CORE-A062 99MAY25 NEOS-A317 99JUN01 CORE-A063 99JUN01 NEOS-A318 99JUN22 NEOS-A321 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 ./cb604.skd for experiment CB604 (all scans with at least one subnet station) SOURCE |0 6 12 18 | #SCANS #OBS #Obs/bl 0048-097Ix x x x x x x xx xx xx x x x I 16 51 6.1 0059+581I x x x x x x x I 7 17 .9 0119+115I xx x x x x xx x xxx xx x x x xxx x I 21 79 7.4 CTA26 I xx x x xx xx xx x x x x x I 15 31 3.4 0402-362I x x x x xx x x x I 9 13 4.6 0528+134Ixx x x xx x x x xx x x x x x xxx I 19 77 7.0 0552+398Ix x x x xx xx x xx xx xx x xx x x x x x xx xx I 27 284 18.9 0718+793Ix xx x x x x x x x x I 11 15 .7 0727-115I x x xxxx xx xx x xx xx x x xx x x xx xxI 25 86 11.2 0749+540I x x x x x x x x xI 9 42 2.3 0805+410I x x x x xx x x x x x xI 12 47 3.3 0823+033I x xx xxx x xx x xx xx x xx x xx xx xI 23 65 6.7 OJ287 I x x x x x x x x x x x xx xI 14 49 4.3 0919-260I x xx x x xx x xx x I 11 11 2.6 4C39.25 I x x x x xx xx x x x x x x xxx x x x x xI 22 204 13.7 OK290 I I 0 0 .0 1034-293I xx x x x I 5 9 2.3 1044+719I x x x x x x I 6 30 1.4 1053+815I x x x I 3 15 .8 1124-186I xx xx xx x x xx x xx x xx x x x xI 20 51 8.0 1128+385Ix x x x x x x x x x I 10 33 2.4 1219+044I xx x x xx x x x xx x I 12 26 2.6 1357+769Ix x x x x x x I 7 71 3.8 1606+106Ixx x x xx x x xx x x I 12 37 3.5 1622-253Ix xx xxx xxx xxx x x x x x I 17 25 5.0 NRAO512 I x x I 2 11 .9 1739+522I x I 1 6 .4 1741-038Ixx x xx xxx xx xx x xx x x xx x xx x x x x I 26 119 13.5 1749+096I xx x x x xxxx x xx x xx xx x x x xxI 22 111 10.5 1921-293I x x xx xx xx xxx xx x xx I 16 34 8.0 1958-179I x xxx x x xx x xxx xx x x x x x I 19 53 7.2 2121+053I xx x xx x x x xx x x x xx x xx x xI 20 75 7.5 2128-123I x x xx x x x x I 8 14 1.7 2145+067I x x xx x x x I 7 27 2.7 Total scans, obs: 454 1818 Average number of obs. per baseline per source (normalized by up-time) = 5.2 Min = .0 Max = 30.5 (Baseline Yk-15 on 1741-038) RMS = 6.9 Total time: 1435 minutes ( 23.9 hours). Key: Ap=ALGOPARK Yk=ARIES_9M 15=DSS15 Ft=FORTLEZA Ka=KASHIMA Kk=KOKEE On=ONSALA60 Ap Yk 15 Ft Ka Kk On Avg % obs. time: 21 16 23 25 30 33 25 25 % cal. time: 2 1 3 1 2 3 2 2 % slew time: 54 16 38 24 21 16 12 26 % idle time: 21 65 34 48 45 47 60 46 # of tapes : 1.3 1.0 .5 1.6 1.8 .6 1.6 total # scans: 233 104 271 138 221 274 175 202 # scans/hour : 9 4 11 5 9 11 7 8.4 Avg scan (sec): 78 138 75 159 118 104 126 114 # OF OBSERVATIONS BY BASELINE | Ap Yk 15 Ft Ka Kk On StnTotal ------------------------------------------ Ap|233 73 188 101 62 123 99 646 Yk| 104 82 45 51 71 55 377 15| 271 84 109 203 68 734 Ft| 138 4 46 75 355 Ka| 221 178 65 469 Kk| 274 36 657 On| 175 398 Number of 2-station scans: 187 Number of 3-station scans: 112 Number of 4-station scans: 89 Number of 5-station scans: 47 Number of 6-station scans: 18 Number of 7-station scans: 1 Total # of scans, observations: 454 1818 Average baseline components for all observations Average XY = 5626. Average XZ = 4633. Average YZ = 4231. Average length = 6177.