CORE-B605 (Continuous Observations of the Rotation of the Earth-B605) 1999 October 4 Notes prepared by Cynthia Thomas and Nancy Vandenberg,NVI/GSFC Schedule name: CB605.SKD on CDDISA Nominal Start: 16:00 U.T. on October 4 (day 277) first observation at 16:00 U.T. on 4C39.25 Nominal Stop: 16:00 U.T. on October 5 (day 278) last observation at 15:48 U.T. on 1124-186 for FT last observation at 15:54 U.T. on 0552+398 for YK-KA-KK-ON last observation at 15:58 U.T. on 0718+793 for AP-65 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) 226 72828201 Yellowknife X YK 1 (HDT) 111 72965101 DSS65 M 65 1 (TT) 265 16658501 Fortaleza F FT 2 (HDT) 160 72974801 Kashima-26m Q KA 2 (HDT) 221 18567601 Kokee K KK 1 (TT) 243 72983001 Onsala T ON 2 (HDT) 223 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 | 67.39| UT1-TAI | 49% | | | | | | |Y-Wobble | 54.50| ------- | under 40% | | | | | | |UT1-TAI | 2.53| X WOBBLE | 49% | | | | | | |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 ==== ========== 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 ./cb605.skd for experiment CB605 (all scans with at least one subnet station) SOURCE |0 6 12 18 | #SCANS #OBS #Obs/bl 0048-097I xx x x x xx xx x x x xI 13 25 3.0 0059+581I x x xI 3 12 .6 0119+115I x x xxx x xx xxx x xx xx x xx x xx x I 23 76 7.1 CTA26 Ix xx x x xx x x xxx x x x xx x xx I 20 30 3.3 0402-362I x x xx xx xx x x x x xx I 14 14 5.4 0528+134Ixx x x x x xx xx x x xx I 14 39 3.5 0552+398Ix x xx xx xx xx xxx xx xx x x xxx xx x x xx x x I 30 306 20.1 0718+793Ix x x x x x x x x x I 10 10 .5 0727-115I x x xxx xxx xxx xx x x xxx xx x xx x x I 25 74 9.4 0749+540I x x x xx x x x x xI 10 42 2.4 0805+410I x x xx x x x I 7 22 1.5 0823+033I x x xx xx xxxxx x xxx xx x x x xx x xx x x xI 28 54 5.6 OJ287 I x x x xx xxx x xx x x x x x xI 17 27 2.3 0919-260I xxx xx xx x I 8 8 1.6 4C39.25 I x x xx x xxx x x xx x x xx x x x xxx x x xI 25 253 16.8 OK290 I x x x x I 4 4 .3 1034-293Ix x x x x x x xx x x I 11 11 2.8 1044+719I x x I 2 12 .6 1053+815I x x x I 3 15 .8 1124-186I xxx x x xx x x xx x xx x xx x xI 19 40 6.0 1128+385I x x x x x xI 6 21 1.5 1219+044I I 0 0 .0 1357+769I x x x x x x x x x x x I 11 126 7.6 1606+106I xx x x xx x x x x x xx x x I 15 47 4.5 1622-253I x xxx xx x x x x x xxx x x x x I 18 26 5.1 NRAO512 I x x x x x x x x x x I 10 70 5.4 1739+522Ix xx x x x x x xx I 10 34 1.9 1741-038Ixxx xx xx xx xxx x xxx x xx x xx x xx x x x I 28 100 11.3 1749+096Ix xx x x x x xx x x xx x x x x xx x I 20 95 9.0 1921-293Ixxx x xx xxx x xx xx x x x x I 18 24 5.7 1958-179Ix xx xxx xx xxx x xx x x x x I 18 32 4.5 2121+053I x xx xx xx xxx xxx xx xx xx x I 20 55 5.4 2128-123I x x x xx x xx x I 9 11 1.4 2145+067I x x x x x x xxx xxI 11 50 5.0 Total scans, obs: 480 1765 Average number of obs. per baseline per source (normalized by up-time) = 4.8 Min = .0 Max = 32.2 (Baseline 65-On on 0823+033) RMS = 7.0 Total time: 1439 minutes ( 24.0 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: 19 15 24 24 31 30 28 24 % cal. time: 2 1 3 1 2 2 2 2 % slew time: 56 18 35 28 22 13 15 27 % idle time: 21 65 37 45 42 52 53 45 # of tapes : 1.3 1.0 .5 1.5 2.0 .5 1.8 total # scans: 226 111 265 160 221 243 223 207 # scans/hour : 9 4 11 6 9 10 9 8.6 Avg scan (sec): 74 116 78 131 124 109 110 105 # OF OBSERVATIONS BY BASELINE | Ap Yk 65 Ft Ka Kk On StnTotal ------------------------------------------ Ap|226 69 147 102 60 112 115 605 Yk| 111 44 39 64 81 61 358 65| 265 125 64 50 190 620 Ft| 160 7 44 88 405 Ka| 221 176 75 446 Kk| 243 52 515 On| 223 581 Number of 2-station scans: 201 Number of 3-station scans: 148 Number of 4-station scans: 69 Number of 5-station scans: 46 Number of 6-station scans: 15 Number of 7-station scans: 1 Total # of scans, observations: 480 1765 Average baseline components for all observations Average XY = 5672. Average XZ = 5002. Average YZ = 4270. Average length = 6344.