Session Notes for rd1903 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 RD1903, we schedule 22 out of the 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 and Kokee will observe INT I19099 during the time from 1815 UT to 1945 UT. Wettzell will observe INT W19100 during the time from 0700 UT to 0930 UT. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD1903 Description R&D-04/2019 Scheduler: NASA Correlator: HAYS Start: 2019-099-17:30:00 End: 2019-100-17:30:00 Current yyyyddd: 2019100 (2019.27) ( 18584 MJD, WED. 10APR.) Greenwich sidereal time: 06:43:09 (17:28:32 UT) Sun's RA and DEC: 1h 16.0m 8d 1.7 ==================================================== First observations Observation listing from file ./rd1903_v5.skd for experiment RD1903 Source Start DURATIONS name yyddd-hhmmss Ft Hh Ho Kb Kk Ny Wz 0016+731 19099-173000| 40 169 286 247 286| 1057-797 19099-173000| 40 40 | 3C274 19099-173551| 44 52 87 110 110| 1514+197 19099-173837| 157 96 171 171 | 0823-223 19099-174012| 80 80 79| End of listing. ==================================================== Last observations Observation listing from file ./rd1903_v5.skd for experiment RD1903 Source Start DURATIONS name yyddd-hhmmss Ft Hh Ho Kb Kk Ny Wz 2329-415 19100-170816| 390 390 | 1806+456 19100-171440| 82 40 82| 0133+476 19100-171723| 464 464 97 147| 1251-197 19100-172004| 284 284 239 | 1104+728 19100-172044| 276 276| 1418+546 19100-172630| 40 72 40 72| 1144-379 19100-172639| 191 191 | 0716+714 19100-172832| 78 78 40 78| End of listing. ==================================================== SKED Summary from file ./rd1903_v5.skd for experiment RD1903 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 7.3 Min = 0.0 Max = 51.4 (Baseline Ft-Ny on 0458-020) RMS = 8.3 Total time: 1440 minutes ( 24.0 hours). Key: Ft=FORTLEZA Hh=HARTRAO Ho=HOBART26 Kb=KASHIM34 Kk=KOKEE Ny=NYALES20 Wz=WETTZELL Ft Hh Ho Kb Kk Ny Wz Avg % obs. time: 49 49 56 63 62 72 64 59 % cal. time: 2 2 2 2 2 2 2 2 % slew time: 23 37 29 24 12 12 7 21 % idle time: 25 11 13 10 23 13 26 18 total # scans: 162 178 196 201 194 201 187 188 # scans/hour : 7 7 8 8 8 8 8 8 Avg scan (sec): 263 238 245 271 275 310 298 271 # data tracks: 32 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 32 Total TB(M5): 5.46 5.42 6.15 6.98 6.84 7.99 7.13 6.57 # OF OBSERVATIONS BY BASELINE | Ft Hh Ho Kb Kk Ny Wz Total --------------------------------------------- Ft| 81 22 22 40 89 92 346 Hh| 65 32 0 67 89 334 Ho| 110 105 24 18 344 Kb| 137 98 69 468 Kk| 87 61 430 Ny| 141 506 Wz| 470 Number of 2-station scans: 167 Number of 3-station scans: 172 Number of 4-station scans: 86 Number of 5-station scans: 25 Number of 6-station scans: 0 Number of 7-station scans: 0 Total number of scans: 450 Total number of obs: 1449 Total integrated obs-time: 383226 Average obs-time: 264.5 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: | 241| 154| 102| 62| 79| 76| 77| 66| 44| 36| 43| 42| 32| 39| 43| 71| 25| 53| 164| Average X-band SNRs by baseline | Ft Hh Ho Kb Kk Ny Wz AVG -------------------------------------------- Ft| 42 33 29 31 40 58 43 Hh| 41 30 - 44 63 47 Ho| 32 31 34 52 34 Kb| 31 41 50 36 Kk| 39 47 35 Ny| 92 55 Wz| 66 Average S-band SNRs by baseline | Ft Hh Ho Kb Kk Ny Wz AVG -------------------------------------------- Ft| 27 21 20 25 19 25 23 Hh| 33 28 - 25 33 29 Ho| 27 32 16 26 29 Kb| 43 26 30 32 Kk| 30 36 35 Ny| 36 27 Wz| 32 ==================================================== 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 KASHIM34 KOKEE NYALES20 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 Kb KASHIM34 K5 Kk KOKEE Mark5B Ny NYALES20 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 Kb Kk Ny Ft Hh Ho Kb Kk Ny Hh 20 Hh 15 Ho 20 20 Ho 15 15 Kb 20 20 20 Kb 15 15 15 Kk 20 20 20 20 Kk 15 15 15 15 Ny 20 20 20 20 20 Ny 15 15 15 15 15 Wz 20 20 20 20 20 20 Wz 15 15 15 15 15 15 ====================================================