Session Notes for RD1202 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 RD1202 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 fourth session to support observations close to the Sun. The RD1202 schedule uses the R1 frequency setup. It was generated using SNRs of 20 at X-band and 15 at S-band for all stations except TIGO which was scheduled with values of 18 and 12. All stations have been fully scheduled; TIGO was given extra weight. The schedule uses a selection of 120 sources from the good geodetic source list plus four extra sources with a closer angular distance to the Sun. There are six sources with an angular distance less than 15 deg to the Sun: 0007+106 (IIIZW2), 0019+058, 0055-059, 0111+021, 0119+115, and 0119+041. The limit for the angular distance to the Sun was set to 4 deg and a regular R1 scheduling was done. This resulted in 22 observational scans with a distance to the Sun ranging from 5.8 deg to 12.0 deg. These scans are observed by subnets of the following seven stations: Hh, Kk, Ny, On, Ts, Wf, and Wz. There is no scan close to the Sun for Tc. Scans with observations close to the Sun Source Start DURATIONS name yyddd-hhmmss Hh Kk Ny On Tc Ts Wf Wz ------------------------------------------------------- IIIZW2 12094-201504| 66 66 | 11.7 deg from sun 0019+058 12094-223547| 82 82 | 7.6 deg from sun 0111+021 12095-014104| 62 62 | 6.1 deg from sun 0019+058 12095-021558| 86 86 | 7.7 deg from sun 0119+041 12095-021919| 84 84 | 7.2 deg from sun IIIZW2 12095-022125| 87 87 | 11.9 deg from sun IIIZW2 12095-035156| 72 72 | 11.9 deg from sun 0119+041 12095-052804| 62 62 | 7.1 deg from sun 0055-059 12095-053930| 62 62 | 11.5 deg from sun 0111+021 12095-070018| 208 196 208| 5.9 deg from sun 0055-059 12095-073528| 56 56| 11.5 deg from sun IIIZW2 12095-074500| 237 237 68 211| 12.0 deg from sun 0119+115 12095-075211| 238 238 68 217| 9.0 deg from sun 0119+115 12095-083519| 177 62 177| 9.0 deg from sun 0111+021 12095-084213| 303 303 175| 5.9 deg from sun 0119+041 12095-091037| 219 219| 7.0 deg from sun 0111+021 12095-095509| 167 167| 5.9 deg from sun 0019+058 12095-110651| 286 286 186| 8.1 deg from sun 0111+021 12095-112347| 269 269 164| 5.8 deg from sun 0019+058 12095-142140| 217 217 153| 8.2 deg from sun 0119+115 12095-145139| 285 258 285 213| 8.8 deg from sun 0019+058 12095-145657| 220 220 156| 8.2 deg from sun ------------------------------------------------------- Sources with observations close to the Sun (indicated by an 'x') 4 chars/hour SOURCE | 0 3 6 9 12 15 18 21 | #SCANS #OBS #Obs/bl ---------------------------------------------------------------------------------------------------------- IIIZW2 | x x x x | 4 9 1.5 0019+058| x x x x x | 5 11 1.3 0055-059| x x | 2 2 0.9 0111+021| x x x x x | 5 11 1.6 0119+115| x x x | 3 15 2.1 0119+041| x x x | 3 3 0.5 ---------------------------------------------------------------------------------------------------------- Total scans, obs: 22 51 Kokee and Wettzell will observe INT I12094 during the time from 1815 UT to 1945 UT. =========================================================== Experiment: RD1202 Description R&D-02 2012 Scheduler: NASA Correlator: HAYS Start: 2012-094-18:00:00 End: 2012-095-18:00:00 Current yyyyddd: 2012094 (2012.26) ( 16021 MJD, TUES 3APR.) Greenwich sidereal time: 6:49: 0.00 (18: 0: 0 UT) Sun's RA and DEC: 0h 52.9m 5d 40.1 =========================================================== First observations Observation listing from file ./rd1202.skd for experiment RD1202 Source Start DURATIONS name yyddd-hhmmss Hh Kk Ny On Tc Ts Wf Wz 0059+581 12094-180000| 40 40 40 | 0420-014 12094-180000| 59 147 147 64 64| ...... End of listing. =========================================================== Last observations Observation listing from file ./rd1202.skd for experiment RD1202 Source Start DURATIONS name yyddd-hhmmss Kk Ma Ny On Sh Ts Wf Wz ...... 0332-403 12095-175448| 116 116 | 1803+784 12095-175649| 40 40 40 40 40 40| End of listing. =========================================================== SKED Summary from file ./rd1202.skd for experiment RD1202 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 4.2 Min = 0.0 Max = 84.7 (Baseline Kk-Wf on 1144-379) RMS = 8.1 Total time: 1438 minutes ( 24.0 hours). Key: Hh=HARTRAO Kk=KOKEE Ny=NYALES20 On=ONSALA60 Tc=TIGO Ts=TSUKUB32 Wf=WESTFORD Wz=WETTZELL Hh Kk Ny On Tc Ts Wf Wz Avg % obs. time: 31 52 57 57 58 42 58 52 51 % cal. time: 3 4 4 4 3 6 4 5 4 % slew time: 50 19 20 23 7 22 15 13 22 % idle time: 16 23 18 14 31 29 22 30 23 total # scans: 236 375 385 375 292 496 360 423 367 # scans/hour : 10 16 16 16 12 21 15 18 15 Avg scan (sec): 112 120 127 131 171 73 139 105 122 # data tracks: 16 16 16 16 16 16 16 16 # Mk5 tracks: 16 16 16 16 16 16 16 16 Total GBytes: 950 1625 1766 1774 1800 1307 1805 1605 1579 Total GB(M5): 844 1445 1569 1576 1600 1162 1605 1426 1404 # 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: 11228.3 # OF OBSERVATIONS BY BASELINE | Hh Kk Ny On Tc Ts Wf Wz StnTotal -------------------------------------------------- Hh| 0 30 61 117 61 53 90 412 Kk| 107 55 120 210 154 66 712 Ny| 264 15 219 155 244 1034 On| 31 162 135 274 982 Tc| 24 141 29 477 Ts| 92 221 989 Wf| 127 857 Wz| 1051 Number of 2-station scans: 567 Number of 3-station scans: 246 Number of 4-station scans: 142 Number of 5-station scans: 62 Number of 6-station scans: 32 Number of 7-station scans: 0 Number of 8-station scans: 0 Total # of scans, observations: 1049 3257 =========================================================== Recording mode Name Code GEOSX SX Recording mode setup for: HARTRAO KOKEE NYALES20 ONSALA60 TIGOCONC 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 Hh HARTRAO Mark5B Kk KOKEE Mark5A Ny NYALES20 Mark5A On ONSALA60 Mark5A Tc TIGOCONC Mark5B 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) Hh Kk Ny On Tc Ts Wf Hh Kk Ny On Tc Ts Wf Kk 20 Kk 15 Ny 20 20 Ny 15 15 On 20 20 20 On 15 15 15 Tc 18 18 18 18 Tc 12 12 12 12 Ts 20 20 20 20 18 Ts 15 15 15 15 12 Wf 20 20 20 20 18 20 Wf 15 15 15 15 12 15 Wz 20 20 20 20 18 20 20 Wz 15 15 15 15 12 15 15 ===========================================================