Session Notes for rd1908 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 RD1908, we schedule twenty-seven of these 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 and Kokee will observe INT I19239 during the time from 1815 UT to 1945 UT. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD1908 Description R&D-08/2019 Scheduler: NASA Correlator: SHAO Start: 2019-239-17:30:00 End: 2019-240-17:30:00 Current yyyyddd: 2019239 (2019.65) ( 18723 MJD, TUES 27AUG.) Greenwich sidereal time: 15:52:39 (17:30:00 UT) Sun's RA and DEC: 10h 24.2m 9d 58.9 =========================================================== First observations Observation listing from file ./rd1908.skd for experiment RD1908 Source Start DURATIONS name yyddd-hhmmss Ft Hh Ho Kk Km Mc Ny On Wz 0537-441 19239-173000| 332 332 | 1725+123 19239-173000| 436 219 86 256 260 436 192| 0133+476 19239-173725| 40 40 40 42 42| 0241+622 19239-173851| 150 233 284 347 348 348| 1758-651 19239-173922| 129 129 129 | 0823-223 19239-174349| 349 349 | 2145+082 19239-174552| 600 600 250 600 475 600 491| End of listing. =========================================================== Last observations Observation listing from file ./rd1908.skd for experiment RD1908 Source Start DURATIONS name yyddd-hhmmss Ft Hh Ho Kk Km Mc Ny On Wz 0522-611 19240-170622| 439 439 | 1418+546 19240-171250| 123 70 123 48| IIIZW2 19240-171655| 600 600 395 600 | 1334-127 19240-172015| 47 40 47 40 40| 1519-273 19240-172301| 139 139 117 98| 0716+714 19240-172534| 40 40 40| 1806+456 19240-172803| 107 107 107 61 99 46| 0256-005 19240-172851| 59 59 | End of listing. =========================================================== SKED Summary from file ./rd1908.skd for experiment RD1908 (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 Ho-On on 2208-137) RMS = 8.8 Total time: 1440 minutes ( 24.0 hours). Key: Ft=FORTLEZA Hh=HARTRAO Ho=HOBART26 Kk=KOKEE Km=KUNMING Mc=MEDICINA Ny=NYALES20 On=ONSALA60 Wz=WETTZELL Ft Hh Ho Kk Km Mc Ny On Wz Avg % obs. time: 54 50 59 60 57 63 72 71 72 62 % cal. time: 2 2 2 2 3 2 2 2 3 2 % slew time: 24 35 27 13 29 29 12 12 7 21 % idle time: 19 12 11 24 10 4 12 13 17 14 total # scans: 174 167 183 194 257 206 204 178 227 198 # scans/hour : 7 7 8 8 11 9 9 7 9 8 Avg scan (sec): 268 258 278 266 192 266 306 346 274 272 # data tracks: 32 32 32 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 32 32 32 Total TB(M5): 5.96 5.52 6.52 6.61 6.33 7.01 7.98 7.87 7.95 6.86 # OF OBSERVATIONS BY BASELINE | Ft Hh Ho Kk Km Mc Ny On Wz Total ------------------------------------------------------- Ft| 78 14 50 63 96 84 95 107 587 Hh| 60 0 84 89 63 70 89 533 Ho| 94 108 24 31 23 28 382 Kk| 105 72 96 64 88 569 Km| 133 141 111 146 891 Mc| 168 155 189 926 Ny| 145 173 901 On| 156 819 Wz| 976 Number of 2-station scans: 149 Number of 3-station scans: 94 Number of 4-station scans: 36 Number of 5-station scans: 71 Number of 6-station scans: 66 Number of 7-station scans: 45 Number of 8-station scans: 0 Number of 9-station scans: 0 Total number of scans: 461 Total number of obs: 3292 Total integrated obs-time: 793970 Average obs-time: 241.2 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: | 761| 230| 309| 199| 128| 167| 150| 101| 111| 72| 151| 93| 98| 120| 61| 47| 73| 72| 349| Average X-band SNRs by baseline | Ft Hh Ho Kk Km Mc Ny On Wz AVG ------------------------------------------------------ Ft| 46 31 33 59 48 44 43 69 50 Hh| 43 - 68 61 52 48 86 59 Ho| 35 54 36 40 29 46 42 Kk| 65 47 60 40 74 53 Km| 85 99 71 126 83 Mc| 79 72 122 79 Ny| 73 128 82 On| 113 71 Wz| 107 Average S-band SNRs by baseline | Ft Hh Ho Kk Km Mc Ny On Wz AVG ------------------------------------------------------ Ft| 28 28 30 38 23 21 20 31 27 Hh| 32 - 49 34 29 27 41 35 Ho| 33 36 22 19 16 23 30 Kk| 70 44 51 36 63 49 Km| 48 54 40 66 51 Mc| 35 32 50 38 Ny| 31 50 40 On| 45 33 Wz| 49 =========================================================== 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 KOKEE KUNMING MEDICINA NYALES20 ONSALA60 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 Kk KOKEE Mark5B Km KUNMING Mark5B Mc MEDICINA 17640feet (Thin ) 56250 (HIGH ) 14 Ny NYALES20 Mark5B On ONSALA60 17640feet (Thin ) 56250 (HIGH ) 14 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 Kk Km Mc Ny On Ft Hh Ho Kk Km Mc Ny On Hh 20 Hh 15 Ho 20 20 Ho 15 15 Kk 20 20 20 Kk 15 15 15 Km 20 20 20 20 Km 15 15 15 15 Mc 20 20 20 20 20 Mc 15 15 15 15 15 Ny 20 20 20 20 20 20 Ny 15 15 15 15 15 15 On 20 20 20 20 20 20 20 On 15 15 15 15 15 15 15 Wz 20 20 20 20 20 20 20 20 Wz 15 15 15 15 15 15 15 15 ===========================================================