Session Notes for RD1107 Prepared by D. Behrend, NVI, Inc./GSFC =========================================================== PURPOSE AND GENERAL NOTES =========================================================== With the start of the IVS observing program in 2002 (based on the WG2 Report), sources were only scheduled when they had an angular distance to the Sun of more than 15 deg. Based on data from RDV and VCS experiments, Sebastien Lambert (Paris Observatory) expects that the inclusion of sources closer to the Sun can improve the determination of the post-Newtonian parameter gamma by 15% (even with a modest number of observations below 15 deg per session; for instance, 1-2 observations per session). The purpose of RD1107 is to provide observational data to support this claim and, if successful, to eventually change the general IVS scheduling to include one or two observations per session close to the Sun. This is the second session to support observations close to the Sun. The RD1107 schedule uses the R1 frequency setup. It was generated using SNRs of 20 at X-band and 15 at S-band for all stations. All stations have been fully scheduled. The schedule uses a selection of 120 sources from the good geodetic source list plus three extra sources with a closer angular distance to the Sun. There are four sources with an angular distance less than 15 deg to the Sun: 1622-253, 1657-261, 1706-174, and 1730-130 (NRA0530). The limit for the angular distance to the Sun was set to 4 deg and a regular R1 scheduling was done. This resulted in 27 observational scans with a distance to the Sun ranging from 4.1 deg to 13.6 deg. These scans are observed by subnets of the following seven stations: Kk, Ma, On, Sh, Ts, Wf, and Wz. There is no scan close to the Sun for Ny. Scans with observations close to the Sun Source Start DURATIONS name yyddd-hhmmss Kk Ma Ny On Sh Ts Wf Wz ------------------------------------------------------- 1622-253 11340-221157| 40 40 | 6.6 deg from sun NRAO530 11340-222809| 40 40 | 13.6 deg from sun 1622-253 11340-224623| 40 40 | 6.6 deg from sun NRAO530 11340-235302| 40 40 40 | 13.6 deg from sun 1622-253 11340-235420| 40 40 40 | 6.7 deg from sun 1657-261 11340-235816| 154 154 74 | 4.2 deg from sun NRAO530 11341-002707| 40 40 40 | 13.6 deg from sun 1622-253 11341-002825| 40 40 40 | 6.7 deg from sun NRAO530 11341-013500| 40 40 40 | 13.5 deg from sun 1622-253 11341-013619| 40 40 40 | 6.7 deg from sun 1657-261 11341-014347| 158 158 74 | 4.1 deg from sun 1706-174 11341-015010| 205 205 95 | 6.5 deg from sun 1622-253 11341-031525| 40 40 | 6.8 deg from sun 1622-253 11341-034809| 40 40 | 6.8 deg from sun NRAO530 11341-042057| 40 40 40 | 13.4 deg from sun 1622-253 11341-042417| 40 40 | 6.8 deg from sun 1622-253 11341-045859| 40 40 | 6.9 deg from sun 1622-253 11341-054455| 40 40 | 6.9 deg from sun NRAO530 11341-075551| 40 40 40| 13.3 deg from sun NRAO530 11341-090029| 93 93 55| 13.3 deg from sun 1622-253 11341-093413| 40 40 40| 7.0 deg from sun 1622-253 11341-103531| 40 40 40| 7.1 deg from sun NRAO530 11341-105049| 88 88 50| 13.3 deg from sun 1622-253 11341-111456| 40 40 40| 7.1 deg from sun NRAO530 11341-124847| 88 88 71 50| 13.2 deg from sun NRAO530 11341-133742| 90 90 64 52| 13.2 deg from sun NRAO530 11341-145416| 96 96 65 60| 13.2 deg from sun ------------------------------------------------------- Sources with observations close to the Sun 4 chars/hour SOURCE | 0 3 6 9 12 15 18 21 | #SCANS #OBS #Obs/bl ---------------------------------------------------------------------------------------------------------- 1622-253| x x x x x x x x x x x x x| 13 25 11.6 1657-261| x x| 2 6 2.6 1706-174| x | 1 3 0.8 NRAO530 | x x x x x x x x x x x| 11 40 12.5 ---------------------------------------------------------------------------------------------------------- Total scans, obs: 27 74 Kokee and Wettzell will observe INT I11340 during the time from 1815 UT to 1945 UT. =========================================================== Experiment: RD1107 Description R&D-07 2011 Scheduler: NASA Correlator: HAYS Start: 2011-340-17:30:00 End: 2011-341-17:30:00 Current yyyyddd: 2011340 (2011.93) ( 15902 MJD, TUES 6DEC.) Greenwich sidereal time: 22:30: 0.00 (17:30: 0 UT) Sun's RA and DEC: 16h 51.6m -22d 30.4 =========================================================== First observations Observation listing from file ./rd1107.skd for experiment RD1107 Source Start DURATIONS name yyddd-hhmmss Kk Ma Ny On Sh Ts Wf Wz 0716+714 11340-173000| 54 59 44 59 44 40 55 40| 0059+581 11340-173158| 54 49 54 40| ...... End of listing. =========================================================== Last observations Observation listing from file ./rd1107.skd for experiment RD1107 Source Start DURATIONS name yyddd-hhmmss Kk Ma Ny On Sh Ts Wf Wz ...... 1133-032 11341-172554| 242 242 104 | 0059+581 11341-172858| 43 40 40 40 43 40| End of listing. =========================================================== SKED Summary from file ./rd1107.skd for experiment RD1107 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 4.9 Min = 0.0 Max = 96.0 (Baseline Ny-Ts on 1351-018) RMS = 7.7 Total time: 1440 minutes ( 24.0 hours). Key: Kk=KOKEE Ma=MATERA Ny=NYALES20 On=ONSALA60 Sh=SESHAN25 Ts=TSUKUB32 Wf=WESTFORD Wz=WETTZELL Kk Ma Ny On Sh Ts Wf Wz Avg % obs. time: 39 53 56 51 53 39 40 43 47 % cal. time: 4 4 4 4 5 7 3 5 5 % slew time: 19 25 17 21 28 23 13 11 20 % idle time: 37 17 23 23 13 30 43 40 29 total # scans: 369 358 354 358 438 580 292 404 394 # scans/hour : 15 15 15 15 18 24 12 17 16 Avg scan (sec): 91 129 136 122 105 58 119 92 106 # data tracks: 16 16 16 16 16 16 16 16 # Mk5 tracks: 16 16 16 16 16 16 16 16 Total GBytes: 1204 1657 1728 1574 1656 1220 1250 1340 1454 Total GB(M5): 1070 1473 1536 1399 1472 1085 1111 1191 1292 # of tapes : 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 tape change times (hhmm): Total number of tapes: 8.0 Total GBytes (M5) recorded: 10338.0 # OF OBSERVATIONS BY BASELINE | Kk Ma Ny On Sh Ts Wf Wz StnTotal -------------------------------------------------- Kk| 33 79 44 236 324 97 38 851 Ma| 186 294 113 138 141 293 1198 Ny| 190 140 201 174 239 1209 On| 96 128 158 280 1190 Sh| 411 51 121 1168 Ts| 126 165 1493 Wf| 161 908 Wz| 1297 Number of 2-station scans: 103 Number of 3-station scans: 446 Number of 4-station scans: 166 Number of 5-station scans: 95 Number of 6-station scans: 52 Number of 7-station scans: 18 Number of 8-station scans: 4 Total # of scans, observations: 884 4657 =========================================================== Recording mode Name Code GEOSX SX Recording mode setup for: KOKEE MATERA NYALES20 ONSALA60 SESHAN25 TSUKUB32 WESTFORD WETTZELL Mode Tot.Rate Tot.BandW #chan #bits Barrel Mk341:2 256.000 Mbits 128.000 MHz 14 1 NONE Chan.BW #Subpasses Tracks(*fan) Tot.tracks Speed 8.00 MHz 1 16(*2) 32 0.00 X-band spanned bw= 720.0 MHz rms spanned bw= 280.4 MHz S-band spanned bw= 140.0 MHz rms spanned bw= 50.9 MHz Effective number of channels recorded per sub-pass X S Total 10.000 6.000 16.000 =========================================================== Tape types ID Station Tape length Density Passes Kk KOKEE Mark5A Ma MATERA Mark5A Ny NYALES20 Mark5A On ONSALA60 Mark5A Sh SESHAN25 Mark5A Ts TSUKUB32 K5 Wf WESTFORD Mark5A Wz WETTZELL Mark5A =========================================================== SNR Targets Minimum SNR by baseline for multi-baseline scans X-band (margin 0) S-band (margin 0) Kk Ma Ny On Sh Ts Wf Kk Ma Ny On Sh Ts Wf Ma 20 Ma 15 Ny 20 20 Ny 15 15 On 20 20 20 On 15 15 15 Sh 20 20 20 20 Sh 15 15 15 15 Ts 20 20 20 20 20 Ts 15 15 15 15 15 Wf 20 20 20 20 20 20 Wf 15 15 15 15 15 15 Wz 20 20 20 20 20 20 20 Wz 15 15 15 15 15 15 15 ===========================================================