CORE-B606 (Continuous Observations of the Rotation of the Earth-B606) 1999 October 18 Notes prepared by Cynthia Thomas and Nancy Vandenberg,NVI/GSFC Schedule name: CB606.SKD on CDDISA Nominal Start: 16:00 U.T. on October 18 (day 291) first observation at 16:00 U.T. on 1606+106 for 65-FT first observation at 16:00 U.T. on 4C39.25 for AP-YK-KA-KK-ON Nominal Stop: 16:00 U.T. on October 19 (day 292) last observation at 15:44 U.T. on 1739+522 for 65 last observation at 15:46 U.T. on 1741-038 for FT last observation at 15:55 U.T. on 0552+398 for AP-YK-KA-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) 108 72965101 DSS65 M 65 1 (TT) 266 16658501 Fortaleza F FT 2 (HDT) 153 72974801 Kashima-26m Q KA 2 (HDT) 229 18567601 Kokee K KK 1 (TT) 243 72983001 Onsala T ON 2 (HDT) 218 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. 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 | 68.90| UT1-TAI | 47% | | | | | | |Y-Wobble | 56.89| ------- | under 40% | | | | | | |UT1-TAI | 2.50| X WOBBLE | 47% | | | | | | |UT1-TAI Rate| 6.38| -------- | 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 ==== ========== 99JUN15 CORE-A064 99JUN22 NEOS-A321 99JUN28 EUROPE-49 99JUN29 CORE-A065 99JUN29 NEOS-A322 99JUL06 NEOS-A323 99JUL13 NEOS-A324 99JUL19 IRIS-S140 99JUL20 NEOS-A325 99JUL27 NEOS-A326 99AUG03 NEOS-A327 99AUG10 NEOS-A328 99AUG17 NEOS-A329 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 ./cb606.skd for experiment CB606 (all scans with at least one subnet station) SOURCE |0 6 12 18 | #SCANS #OBS #Obs/bl 0048-097I x x x x x x x xx xx x xx I 14 29 3.5 0059+581I x x x x I 4 24 1.2 0119+115I x x xx xx x x xx x x xx x x x x x x x I 21 67 6.2 CTA26 Ixx xx x xxx xx x x x x xx x xx xx xI 22 34 3.7 0402-362Ix xx x xx x xx x x xx I 13 13 5.0 0528+134Ixx x x xx xx x x xx xI 13 34 3.1 0552+398I xxx x xx x x x xx x xx x x x xxx x xx xx x x xxI 29 283 18.6 0718+793I x x x x x x x x x x I 10 10 .5 0727-115I xxxx xx xx xx xx x xx x xx xx xxx xx x I 26 73 9.4 0749+540I x x x x x x x I 7 34 1.9 0805+410I x x x x x x x x x xI 10 36 2.5 0823+033I x x x xx xx xx xx xx x x x x xxx xx xxx I 25 49 5.1 OJ287 I x x x xxxx xx x xx x x xx xxI 18 30 2.6 0919-260I x xx x x x x x I 8 10 2.1 4C39.25 Ix x xx x x x x xx x x xx x xx x x x x xx I 23 233 15.5 OK290 I x xx x x x I 6 6 .5 1034-293I x xx x x x x x xI 9 9 2.3 1044+719I x x x x I 4 21 1.0 1053+815I x x I 2 12 .7 1124-186Ix x xxx x x x x xx x xx xxx xI 18 39 5.6 1128+385I x x x x x x x I 7 19 1.4 1219+044I x xx x xx xxx x x xx x xxxI 17 27 2.7 1357+769I x x x x x x x x x x x I 11 125 7.1 1606+106Ixx x x x xx x x x x x x x x xxx I 18 44 4.2 1622-253I x xx xx xx x x x x x x x x I 15 25 5.0 NRAO512 I x x x x x I 5 42 3.2 1739+522I x x x x x xx x I 8 30 1.7 1741-038I x xxx xx xxx xx x xx xx xx xx xx x xx x xxxxI 30 113 12.8 1749+096I x x xxx x x x x x x xxx x x I 16 90 8.6 1921-293Ix x x xx xx x x x x xx x x xx xI 18 22 5.2 1958-179Ix xx xx xx xx xxx xx x x x x xx x I 21 39 5.5 2121+053I x xxx xx xx x x xx x x x x I 16 47 4.7 2128-123Ix x x xx x x x x I 9 13 1.6 2145+067Ixx x x x x x xx x xx I 12 53 5.3 Total scans, obs: 485 1735 Average number of obs. per baseline per source (normalized by up-time) = 4.7 Min = .0 Max = 29.9 (Baseline Kk-On on 0552+398) RMS = 6.8 Total time: 1436 minutes ( 23.9 hours). Key: Ap=ALGOPARK Yk=ARIES_9M 65=DSS65 Ft=FORTLEZA Ka=KASHIMA Kk=KOKEE On=ONSALA60 Ap Yk 65 Ft Ka Kk On Avg % obs. time: 20 15 23 21 33 30 26 24 % cal. time: 2 1 3 1 2 2 2 2 % slew time: 54 18 37 26 23 13 14 26 % idle time: 22 64 35 49 41 53 56 46 # of tapes : 1.3 .9 .5 1.3 2.0 .5 1.6 total # scans: 233 108 266 153 229 243 218 207 # scans/hour : 9 4 11 6 9 10 9 8.6 Avg scan (sec): 75 121 77 122 124 107 104 104 # OF OBSERVATIONS BY BASELINE | Ap Yk 65 Ft Ka Kk On StnTotal ------------------------------------------ Ap|233 68 152 97 67 111 113 608 Yk| 108 42 39 62 77 59 347 65| 266 116 66 49 187 612 Ft| 153 6 39 81 378 Ka| 229 185 72 458 Kk| 243 47 508 On| 218 559 Number of 2-station scans: 206 Number of 3-station scans: 151 Number of 4-station scans: 70 Number of 5-station scans: 44 Number of 6-station scans: 13 Number of 7-station scans: 1 Total # of scans, observations: 485 1735 Average baseline components for all observations Average XY = 5681. Average XZ = 4951. Average YZ = 4278. Average length = 6329.