Session Notes for rd1906 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 RD1906, 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 I19191 during the time from 1815 UT to 1945 UT. Wettzell will observe INT W19192 during the time from 0700 UT to 0930 UT. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD1906 Description R&D-07/2019 Scheduler: NASA Correlator: SHAO Start: 2019-191-18:00:00 End: 2019-192-18:00:00 Current yyyyddd: 2019191 (2019.52) ( 18675 MJD, WED. 10JUL.) Greenwich sidereal time: 13:13:29 (18:00:00 UT) Sun's RA and DEC: 7h 18.9m 22d 11.9 =========================================================== First observations Observation listing from file ./rd1906.skd for experiment RD1906 Source Start DURATIONS name yyddd-hhmmss Ft Hh Ho Mc Ny On T6 Wz 1417+385 19191-180000| 402 402 73 161 148 364 176| 2113+293 19191-180407| 504 135 501 504 208| 0716+714 19191-180829| 166 40 181 181| 1351-018 19191-181358| 600 600 600 600 600 | 2314-409 19191-181656| 101 101 | IIIZW2 19191-182122| 135 135 | 1145+268 19191-182620| 247 271 241 271 265 | End of listing. =========================================================== Observation listing from file ./rd1906.skd for experiment RD1906 Source Start DURATIONS name yyddd-hhmmss Ft Hh Ho Mc Ny On T6 Wz 0528-250 19192-172531| 599 599 | 1555+001 19192-172735| 72 137 45 72 106 137| DA426 19192-173136| 141 86 47 77 73 141| 3C371 19192-173442| 155 40 101 155| 1330+476 19192-173909| 600 600 540 600 155 600| 1954-388 19192-174624| 57 42 57 | 2155-304 19192-174840| 127 127 | 1555+001 19192-175425| 325 71 325 162 265 325 325| 1657-261 19192-175748| 122 122 | End of listing. =========================================================== SKED Summary from file ./rd1906.skd for experiment RD1906 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 8.5 Min = 0.0 Max = 96.0 (Baseline Ho-On on 0823-223) RMS = 10.0 Total time: 1440 minutes ( 24.0 hours). Key: Ft=FORTLEZA Hh=HARTRAO Ho=HOBART26 Mc=MEDICINA Ny=NYALES20 On=ONSALA60 T6=TIANMA65 Wz=WETTZELL Ft Hh Ho Mc Ny On T6 Wz Avg % obs. time: 51 50 42 64 71 72 45 64 58 % cal. time: 2 2 2 2 2 2 3 2 2 % slew time: 21 39 27 29 10 11 42 6 24 % idle time: 25 7 28 4 15 13 9 26 16 total # scans: 150 181 189 192 188 178 251 176 188 # scans/hour : 6 8 8 8 8 7 10 7 8 Avg scan (sec): 293 241 192 287 328 351 155 316 270 # data tracks: 32 32 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 32 32 Total TB(M5): 5.62 5.58 4.63 7.06 7.90 7.99 4.98 7.13 6.36 # OF OBSERVATIONS BY BASELINE | Ft Hh Ho Mc Ny On T6 Wz Total -------------------------------------------------- Ft| 78 23 98 89 99 37 88 512 Hh| 59 122 102 106 89 110 666 Ho| 21 22 17 146 18 306 Mc| 169 159 98 159 826 Ny| 151 101 145 779 On| 90 137 759 T6| 91 652 Wz| 748 Number of 2-station scans: 178 Number of 3-station scans: 50 Number of 4-station scans: 27 Number of 5-station scans: 64 Number of 6-station scans: 73 Number of 7-station scans: 19 Number of 8-station scans: 0 Total number of scans: 411 Total number of obs: 2624 Total integrated obs-time: 647748 Average obs-time: 246.9 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: | 383| 260| 297| 234| 147| 138| 99| 140| 53| 113| 62| 47| 55| 82| 38| 47| 48| 48| 333| Average X-band SNRs by baseline | Ft Hh Ho Mc Ny On T6 Wz AVG ------------------------------------------------- Ft| 53 30 58 58 46 179 91 68 Hh| 51 67 55 51 220 87 83 Ho| 46 44 38 187 75 114 Mc| 115 91 301 157 125 Ny| 108 331 182 138 On| 240 138 108 T6| 419 270 Wz| 170 Average S-band SNRs by baseline | Ft Hh Ho Mc Ny On T6 Wz AVG ------------------------------------------------- Ft| 29 21 27 27 22 74 36 31 Hh| 32 41 36 32 115 46 47 Ho| 25 26 22 80 37 53 Mc| 47 37 117 57 51 Ny| 42 129 63 55 On| 94 49 44 T6| 141 108 Wz| 62 =========================================================== 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 ONSALA60 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 On ONSALA60 17640feet (Thin ) 56250 (HIGH ) 14 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 On T6 Ft Hh Ho Mc Ny On 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 On 20 20 20 20 20 On 15 15 15 15 15 T6 20 20 20 20 20 20 T6 15 15 15 15 15 15 Wz 20 20 20 20 20 20 20 Wz 15 15 15 15 15 15 15 ===========================================================