Session Notes for rd1907 Prepared by K. Le Bail, NVI, Inc./GSFC =========================================================== PURPOSE AND GENERAL NOTES =========================================================== GAIA proposal The Laboratory d'Astrophysique de Bordeaux (LAB) subnmitted in 2012 a proposal to observe 195 ICRF2 transfer sources in the context of the GAIA mission. These sources were added to the GSFC monitoring program and 37 sources were scheduled in Gaia-dedicated R&D sessions. In February 2017, we studied the position uncertainties and the observation frequency of the 195 sources of the LAB proposal. Twenty-seven of these sources have a bad observation frequency: they were observed successfully in less than five sessions a year while the LAB requirement was twelve sessions a year. Most of these sources have bad uncertainties compared to the other sources of the set (larger than 50 microas). Three additional sources have good position uncertainties and an observation frequency of five to eleven successful sessions a year. However they are sources that were observed in previous Gaia-dedicated R&D sessions and the concern is that if they are not scheduled in coming dedicated R&D sessions, their observation frequency may drop. The sources scheduled in the Gaia-dedicated R&D sessions scheduled to observe after March 1st, 2017 are these thirty sources. When compared to the previous categories determined by the LAB, one source was in category 1, five sources were in category 2, five sources were in category 3 and nineteen sources were in category 4. In RD1907, we schedule all thirty sources in the astro mode of sked. We use a maxscan value of 600 seconds. We use the sked flux catalog for all sources. The command fill is used with an offset of 10 seconds. We added the source 3C48 to the set of sources in the ASTRO section to monitor its position. We use a modified version of the 1Gbps wide-band mode currently used to schedule AOV sessions. Wettzell will observe INT I19205 during the time from 1815 UT to 1945 UT. Wettzell will observe INT W19206 during the time from 0700 UT to 0930 UT. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD1907 Description R&D-07/2019 Scheduler: NASA Correlator: SHAO Start: 2019-205-18:00:00 End: 2019-206-18:00:00 Current yyyyddd: 2019205 (2019.56) ( 18689 MJD, WED. 24JUL.) Greenwich sidereal time: 14:08:41 (18:00:00 UT) Sun's RA and DEC: 8h 15.2m 19d 48.5 =========================================================== First observations Observation listing from file ./rd1907.skd for experiment RD1907 Source Start DURATIONS name yyddd-hhmmss Ft Hh Ho Mc Ny T6 Wz 0606-223 19205-180000| 259 259 | 1929+226 19205-180000| 48 102 158 40 158| 1659+399 19205-180331| 453 453 453 40 312| 1104+728 19205-180710| 108 108 | 0749+540 19205-180957| 164 164| 0241+622 19205-181322| 118 118 118 98| 1954-388 19205-181538| 40 40 | End of listing. =========================================================== Observation listing from file ./rd1907.skd for experiment RD1907 Source Start DURATIONS name yyddd-hhmmss Ft Hh Ho Mc Ny T6 Wz 1417+385 19206-174050| 112 168 74 88 168| 0137+012 19206-174233| 52 52 | 0749+540 19206-174442| 322 220 122 322| 0211+171 19206-174448| 101 101 | 3C48 19206-174806| 458 458 290 | 1251-197 19206-175107| 291 379 379| 2254+024 19206-175732| 138 138 | 1639-062 19206-175920| 30 30 30 30| End of listing. =========================================================== SKED Summary from file ./rd1907.skd for experiment RD1907 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 7.6 Min = 0.0 Max = 110.8 (Baseline Ft-Ny on 0237-027) RMS = 10.4 Total time: 1440 minutes ( 24.0 hours). Key: Ft=FORTLEZA Hh=HARTRAO Ho=HOBART26 Mc=MEDICINA Ny=NYALES20 T6=TIANMA65 Wz=WETTZELL Ft Hh Ho Mc Ny T6 Wz Avg % obs. time: 50 52 37 68 72 27 64 53 % cal. time: 2 2 2 2 2 3 2 2 % slew time: 20 37 29 24 9 42 5 24 % idle time: 27 8 30 5 15 27 28 20 total # scans: 151 181 198 186 182 245 163 186 # scans/hour : 6 8 8 8 8 10 7 8 Avg scan (sec): 287 249 163 316 343 96 341 255 # data tracks: 32 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 32 Total TB(M5): 5.55 5.77 4.14 7.52 8.00 3.01 7.11 5.87 # OF OBSERVATIONS BY BASELINE | Ft Hh Ho Mc Ny T6 Wz Total --------------------------------------------- Ft| 72 28 97 89 40 82 408 Hh| 63 110 83 72 89 489 Ho| 23 17 133 16 280 Mc| 155 90 149 624 Ny| 104 132 580 T6| 84 523 Wz| 552 Number of 2-station scans: 208 Number of 3-station scans: 54 Number of 4-station scans: 73 Number of 5-station scans: 68 Number of 6-station scans: 16 Number of 7-station scans: 0 Total number of scans: 419 Total number of obs: 1728 Total integrated obs-time: 419898 Average obs-time: 243.0 Histogram of observation durations Dur: 30 60 90 120 150 180 210 240 270 300 330 360 390 420 450 480 510 540 570 600 #Obs: | 422| 125| 99| 92| 110| 75| 72| 38| 63| 80| 83| 51| 52| 49| 38| 30| 38| 47| 164| Average X-band SNRs by baseline | Ft Hh Ho Mc Ny T6 Wz AVG -------------------------------------------- Ft| 43 31 38 38 97 53 47 Hh| 44 47 41 115 58 57 Ho| 43 31 106 47 71 Mc| 70 150 94 77 Ny| 163 100 83 T6| 178 137 Wz| 95 Average S-band SNRs by baseline | Ft Hh Ho Mc Ny T6 Wz AVG -------------------------------------------- Ft| 28 25 22 22 47 28 27 Hh| 37 34 33 70 40 40 Ho| 25 18 52 26 40 Mc| 35 67 43 39 Ny| 70 45 41 T6| 75 64 Wz| 45 =========================================================== Recording mode Name Code AOVSX16W SX Recording mode for: FORTLEZA Mode Tot.Rate Tot.BandW #BBC #bits Barrel Mk341:2 1024 Mbits 128 MHz 14 2 NONE Chan.BW #Subpasses Tracks(*fan) Tot.tracks 16.00 MHz 1 16(*2) 32 X-band spanned bw= 720.0 MHz rms spanned bw= 275.0 MHz S-band spanned bw= 88.0 MHz rms spanned bw= 30.9 MHz Effective number of 1-bit channels recorded per sub-pass X S Total 19.13 11.48 30.61 Recording mode for: HARTRAO HOBART26 MEDICINA NYALES20 TIANMA65 WETTZELL Mode Tot.Rate Tot.BandW #BBC #bits Barrel Mk341:1 1024 Mbits 256 MHz 14 2 NONE Chan.BW #Subpasses Tracks(*fan) Tot.tracks 16.00 MHz 1 32(*1) 32 X-band spanned bw= 720.0 MHz rms spanned bw= 275.0 MHz S-band spanned bw= 88.0 MHz rms spanned bw= 30.9 MHz Effective number of 1-bit channels recorded per sub-pass X S Total 19.13 11.48 30.61 =========================================================== Tape types ID Station Tape length Density Passes Ft FORTLEZA Mark5A Hh HARTRAO Mark5B Ho HOBART26 Mark5B Mc MEDICINA 17640feet (Thin ) 56250 (HIGH ) 14 Ny NYALES20 Mark5B T6 TIANMA65 Mark5B Wz WETTZELL Mark5B =========================================================== SNR targets Minimum SNR by baseline for multi-baseline scans X-band (margin 0) S-band (margin 0) X-band (ast_margin 0) S-band (ast_margin 0) Ft Hh Ho Mc Ny T6 Ft Hh Ho Mc Ny T6 Hh 20 Hh 15 Ho 20 20 Ho 15 15 Mc 20 20 20 Mc 15 15 15 Ny 20 20 20 20 Ny 15 15 15 15 T6 20 20 20 20 20 T6 15 15 15 15 15 Wz 20 20 20 20 20 20 Wz 15 15 15 15 15 15 ===========================================================