SUR001 (Survey North 1) 2000 June 8 Notes prepared by Dave Shaffer, Radiometrics Cynthia Thomas,NVI/GSFC Schedule name: SUR001.SKD on CDDISA Nominal Start: 12:00 U.T. on June 8 (day 160) first observation at 12:00 U.T. on 0014+813 Nominal Stop: 12:00 U.T. on June 9 (day 161) last observation at 11:56 U.T. on 0718+793 Correlator: Washington **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 Fairbanks A GC 2 (TT) 320 40476601 Tsukuba T TS 2 (TT) 320 73452301 Kokee K KK 2 (TT) 320 72983001 Purpose ======= This experiment continues our on-going search for good geodetic calibrator sources. We want to use the strongest but most compact sources for our baseline measurements. Since these sources evolve with time, we face a continuous need to identify the best sources. We also look for sources which might fill gaps in our coverage of the sky, in order to have good observing geometry. This experiment observes sources above about 10 degrees declination. The sources observed include some which we have used extensively in the past (and continue to use) for geodetic experiments but whose structure models are not well-determined, some "old" sources which might evolve back into usefulness, some sources observed in previous survey and reference frame experiments which are being checked again, and half a dozen or so "new" sources from the VLA calibrator manual which have spectra (i.e. flat) indicative of compact structure. Schedule ======== This is a new schedule hand generated by Dave Shaffer. Basically, we just cycle through all the sources while they are "UP" for all three antennas (Gilcreek, Kokee, and Tsukuba). All scan lengths are 200 seconds. This scan length provides a good match to the tape length as well as providing fairly high sensitivity. All but the last few scans fit on a single thin tape. Procedures ========== These observations use our standard narrow-band frequency sequence. Please make sure your best antenna pointing model is used. Accurate fringe amplitudes are much more critical to the success of this experiment than for regular experiments. Two tapes are needed at each site. Please PREPASS the tapes ahead of time, as no time has been allowed in the schedule for PREPASSing. Since these antennas slew relatively rapidly, there are not many slew intervals long enough for parity checking. However, time is allocated for one parity check per tape pass. Hence, please pay careful attention to the parity checks that do occur. Since there are only three participating stations, and nearly all the data is written on a single tape, any tape head problems could seriously compromise the observations. Missing a scan or two while heads are cleaned is OK! Correlation ========== This experiment will be correlated at the Washington Correlator with all baselines being correlated. SKED Summary from file ./sur001.skd for experiment SUR001 (all scans with at least one subnet station) SOURCE |0 6 12 18 | #SCANS #OBS #Obs/bl 0014+813I x x x xx x x x xI 9 27 9.0 0109+224Ix x x x x x x I 7 21 11.9 0119+115I xx x x x x xI 7 21 14.1 0133+476Ix x x x x x x x x I 9 27 11.4 0322+222Ix x x x x x x I 7 21 12.0 0341+158Ix x x x x x x I 7 21 13.2 0440+345Ix x x x x x x I 7 21 9.8 0602+673I x x x x x x x x x I 9 27 10.5 0642+449I x x x x x x x x I 8 24 10.2 0718+793I x x x xx x x x xI 9 27 9.0 0743+259I x x x x x xx I 7 21 11.4 0749+540I x x x x x x x I 7 21 8.7 0804+499I x x x x x xx I 7 21 8.8 0805+410I x x x x x x I 6 18 7.9 0820+560I x x x x x x x I 7 21 8.6 0821+394I x x x x x x I 6 18 8.0 4C39.25 Ix x x x x x x I 7 21 9.4 0945+408Ix x x x x x x I 7 21 9.0 OK290 I x x x x x x I 6 18 9.8 1004+141I x x x x x x I 6 18 11.7 1039+811I x x x x x x x xI 8 24 8.0 1053+815I x x x x x x x xI 8 24 8.0 1101+384I x x x x x x x I 7 21 9.4 1128+385I x x x x x x x I 7 21 9.4 1144+402I x x x x x x x I 7 21 9.3 1150+497I x x x x x x x I 7 21 8.8 1300+580I x x x x x x x x x I 9 27 11.0 1417+385I x x x x x x x I 7 21 9.4 1600+335I x x x x x x x I 7 21 10.0 NRAO512 I x x x x x x x I 7 21 9.3 1739+522I x x x x x x x x I 8 24 10.0 1758+388I x x x x x x x I 7 21 9.4 J1816+53I x x x x x x x x x I 9 27 11.2 1823+568I x x x x x x x x x I 9 27 11.1 1849+670I x x x x x x x x x I 9 27 10.6 2000+472I x x x x x x x x x I 9 27 11.4 2021+317I x x x x x x x I 7 21 10.3 2023+336I x x x x x x x I 7 21 10.0 2029+121I x x x x x x I 6 18 12.1 2113+293I x x x x x x x I 7 21 10.7 2209+236I x x x x x x x I 7 21 11.8 2234+282I x x x x x x x I 7 21 10.9 2320+506I x x x x x x x x xI 9 27 11.3 Total scans, obs: 320 960 Average number of obs. per baseline per source (normalized by up-time) = 10.2 Min = 6.2 Max = 16.3 (Baseline Kk-Ts on 2000+472) RMS = 2.7 Total time: 1440 minutes ( 24.0 hours). Key: Gc=GILCREEK Kk=KOKEE Ts=TSUKUB32 Gc Kk Ts Avg % obs. time: 74 74 74 74 % cal. time: 3 3 3 3 % slew time: 9 8 8 8 % idle time: 12 13 13 13 # of tapes : 1.0 1.0 1.0 total # scans: 320 320 320 320 # scans/hour : 13 13 13 13.3 Avg scan (sec): 200 200 200 200 # OF OBSERVATIONS BY BASELINE | Gc Kk Ts StnTotal -------------------------- Gc|320 320 320 640 Kk| 320 320 640 Ts| 320 640 Number of 2-station scans: 0 Number of 3-station scans: 320 Total # of scans, observations: 320 960 Average baseline components for all observations Average XY = 4654. Average XZ = 3132. Average YZ = 4710. Average length = 5307.