COHIG (CORE O'HIGGINS 3) 1997 November 20 Notes prepared by Klaus Boerger Geodetic Institute of the University of Bonn, Germany GIUB Schedule name: /data5/vlbi/vlbigeo/nov97/cohig3.skd on CDDISA for Koke-Hart-Hoba-Ohig-Wett Nominal Start: 14:00 U.T. on November 20 (doy 324) first observation at 14:00 U.T. on 1144-379 for H-K-P first observation at 14:00 U.T. on 1749+096 for J-V Duration: 24 hours Nominal Stop: 14:00 U.T. on November 21 (doy 325) last observation at 13:50 U.T. on 1954-388 for P last observation at 14:01 U.T. on NRAO512 for J-V last observation at 14:01 U.T. on 0528+134 for H-K Correlator: Bonn Purpose ======= The purpose of the O'Higgins sessions is to continue the monitoring the position of this Antarctic station. This station is not manned year round, and so data is required in campaign mode because of the difficulty of reaching the station. There are two campaigns per year, one in the Antarctic summer months of January-February, and one in the Antarctic spring in September. O'Higgins observes with a network of southern hemisphere stations. Because of the very long baselines in this network, good EOP results are obtained even with the inclusion of the relatively less sensitive O'Higgins antenna. The EOP results from this network meet the goals of the CORE networks. This network includes O#Higgins plus the southern hemisphere stations and would be used only during O'Higgins occupations. Schedule ======== This is a schedule generated with the automatic mode of sked using the variable scan length with a minimum of 90 seconds. The most recent and updated source flux models are included. SNR goals are 20 at X-band and 15 at S-band for all stations (Margins 5). The predicted SNRs used include a 30 ps noise contribution added in quadrature, which is a typical size for the reweight constants size for the reweight constants required in SOLVE solutions. This schedule was optimized by different features: - the covariance analysis during schedule generation considers the previous 4 hours of observations, - minor SKED optimization parameters . maximum number of observations, were optimized over the best ( in a covariance sense ) 30% of the possible observations, this produces a somewhat more even sky distribution, - observations were weighted by their expected SNRs, - 30 ps noise contribution added, - mimimum time between observations of the same radio source was set to 20 min This schedule was made using 52 sources which helped improve the sky coverage. Procedures ========== Please use your standard SGP procedures. Frequency sequence ================== Wideband frequency sequence is used. Early Tape Start ================ Early Tape Start is used to gain synchronization time at the correlator. Materials ========= A supply of mailing labels and red dots for used tapes has been shipped to each station. Correlation ========== This experiment will be correlated at the Bonn Correlator with all baselines being correlated. Summary ======= SKED Summary from file cohig3.skd for experiment COHIG3 (all scans with at least one subnet station) SOURCE |0 3 6 9 12 15 18 21 | #SCANS #OBS #Obs/bl 0048-097IS x x x x x x x x x x x x x x x x x xx x x x x x x x x I 28 32 7.0 0059+581ISx x x x x x x x xx x x x x x x x x x x x x x x x x xI 27 27 20.4 0119+041IS x x x x x x x I 7 7 1.7 0208-512IS x x x x x x x x x x x xx x x x x x x x x x x x x I 25 31 4.4 0229+131IS x x x x x x x x x x xx x x x x x x xI 19 19 4.7 CTA26 IS I 0 0 .0 0454-234IS x x xx x x x x x x x x x x x x x x x x x x x x x x I 27 33 6.3 0458-020ISx x x x x x x x x x I 11 11 2.6 0530-727IS x I 1 1 .3 0528+134IS x xx x x x x x x x x x x x x x x x x I 20 20 4.8 0537-441IS x x x I 3 3 .4 0552+398IS x x x x x x x x x x x x x x I 15 15 5.9 0637-752ISx x x x x x x x x x x x x x x x x x x x x x x x xI 25 45 8.3 0718+793IS I 0 0 .0 0727-115IS x x x x x xx x x x x x x x x xx x x x x x x x x I 25 25 5.3 0804+499IS x x x x x x x x x I 9 9 7.4 0823+033IS x x x x I 4 4 .9 OJ287 IS I 0 0 .0 0919-260IS I 0 0 .0 0920-397IS x I 1 1 .2 4C39.25 IS x x x x xx x x x x x x x x x I 15 15 7.0 OK290 IS x I 1 1 .4 0955+476IS x x x x x x x x x x x x x I 13 13 10.9 1034-293IS x x x x x x x x x x x x x x x x x x I 18 26 4.8 1044+719IS x xx x x x x x x x x x x x x x x x x x x I 21 21 11.9 1057-797IS x x I 2 2 .3 1104-445IS x x I 2 2 .3 1124-186IS x x x xx x x x x x x x x x x I 15 17 3.3 1128+385IS x x x x x x x x x x I 10 10 2.9 1144-379ISx x x x x x x x x x x x I 12 14 2.2 1219+044IS I 0 0 .0 1255-316IS x I 1 1 .2 1308+326IS x x x x x x x x x x x x I 12 12 4.1 1334-127IS x x x x x x I 6 6 1.2 1357+769IS x xx x x x x x x x x x x x x x xI 17 17 8.5 1606+106IS x x x x x x x x x x x x x x x x I 16 16 3.8 1610-771IS x x x x x x I 6 8 1.4 1622-253IS I 0 0 .0 NRAO512 IS x x x xx x x x xx x x x x x x x x x x x I 21 21 8.2 1726+455IS x xx x x x I 6 6 5.1 1739+522IS x xx x x x x x x x x x x x x x I 16 16 12.9 1741-038IS x x x x x x x x x x x x x xx x x x x I 19 33 7.1 1749+096IS x x I 2 2 .5 1815-553IS x x I 3 3 .3 1921-293IS x x x x x x x x x x x x x x xx x x x x I 21 25 4.5 1954-388IS x x x x x x x x x x x x x x x x x x I 19 23 3.7 1958-179IS x x xx x x x x x x x x I 13 15 3.0 2052-474IS I 0 0 .0 2128-123IS I 0 0 .0 2145+067IS x x x x x x x xx x x x x x I 14 16 3.7 2234+282IS x x x I 3 3 .8 2255-282IS x x x I 3 3 .6 Total scans, obs: 554 630 Average number of obs. per baseline per source (normalized by up-time) = 2.8 Min = .0 Max = 40.8 (Baseline Kk-Wz on 0059+581) RMS = 6.5 Total time: 1443 minutes ( 24.1 hours). Key: Hh=HARTRAO Ho=HOBART26 Kk=KOKEE Oh=OHIGGINS Wz=WETTZELL Hh Ho Kk Oh Wz Avg % obs. time: 45 49 48 50 49 48 % cal. time: 2 2 3 1 3 2 % slew time: 31 27 12 10 10 18 % idle time: 20 20 35 37 37 30 # of tapes : 2.7 3.0 .8 3.0 2.9 total # scans: 221 220 276 126 303 229 # scans/hour : 9 9 11 5 12 9.6 Avg scan (sec): 178 196 151 348 140 202 # OF OBSERVATIONS BY BASELINE | Hh Ho Kk Oh Wz StnTotal ---------------------------------- Hh|221 47 0 56 151 203 Ho| 220 119 77 5 237 Kk| 276 15 147 280 Oh| 126 13 360 Wz| 303 180 Number of 2-station scans: 516 Number of 3-station scans: 38 Number of 4-station scans: 0 Number of 5-station scans: 0 Total # of scans, observations: 554 630 Average baseline components for all observations Average XY = 6197. Average XZ = 7802. Average YZ = 6048. Average length = 8654. Parameter values for experiment COHIG3 Current SNR parameter values: VSCAN Y (compute scan lengths) MINSCAN 90sec (min. scan length) MODSCAN 10sec (modular unit of scan) CORSYNCH 0 (corr. tape sync time) MINSUBNET 0 (min. subnet size) Current Procedure parameter values: PREOB PREOB (pre-obs. procedure) MIDOB MIDOB (mid-obs. procedure) POSTOB POSTOB (post-obs. procedure) PREPASS 0sec (accomm. tape pass) CHANGE 420sec (tape change time) SOURCE 5sec (SOURCE command time) SETUP 20sec (MkIII setup procedure) MIDTP 10sec (MIDTP procedure time) CALIBRATION 10sec (time before obs.) DURATION 196sec (default scan time) HEAD 6sec (HEAD command time) PARITY 70sec (parity check procedure) TAPETM 1sec (TAPE command time) IDLE 0sec (idle time after obs.) Current General parameter values: SUBNET HhHoKkOhWz PRFLAG YYNN (required procedures) MODULAR 10sec (start time mark) MINIMUM 0sec (time between obs.) LOOKAHEAD 20min (for WHATSUP) SYNCHRONIZE OFF (tape synchronization) SNR AUTO (reject for low SNR) WIDTH 123columns (width of screen) VIS SUB (subnet source visibility) CONFIRM Y (ask before adding obs) FREQUENCY WB (default freq. code) SUNDIS 15deg (min. distance from sun) Schedule file: /diskB5/sked97/sched/cohig3.skd Process ID: 14287 sked version: 970418 Printer commands: lsk, lskp Current yyddd: 97325 (1997.89) ( 10774 MJD, FRI. 21NOV.) Greenwich sidereal time: 18: 3:36.19 (14: 1:10 UT) Sun's RA and DEC: 15h 48.4m -20d .0