Session Notes for rd1807 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 RD1807, we schedule 23 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 source 3C48 is added to the astro set of sources to monitor the position. In RD1807, we focus on scheduling each source on at least 3 scans. For this reason only twenty of the good geodetic sources are used as base of a stable source set and uniform sky coverage. The command fill is used with an offset of 10 seconds. We use a 1Gbps wide-band mode currently used to schedule AOV sessions. Wettzell and Kokee will observe INT I18254 during the time from 1815 UT to 1945 UT. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD1807 Description R&D-09/2018 Scheduler: NASA Correlator: HAYS Start: 2018-254-17:30:00 End: 2018-255-17:30:00 Current yyyyddd: 2018254 (2018.70) ( 18373 MJD, TUES 11SEP.) Greenwich sidereal time: 16:52:44 (17:30:00 UT) Sun's RA and DEC: 11h 19.3m 4d 22.7 =========================================================== First observations Observation listing from file ./rd1807.skd for experiment RD1807 Source Start DURATIONS name yyddd-hhmmss Ft Hh Ho Kk Ma Ny Wz 0237-027 18254-173000| 309 309 | 1749+096 18254-173000| 97 40 73 134 134| NRAO512 18254-173303| 134 184 159 161 184| 0955+476 18254-173710| 156 125 103 125 156| 3C48 18254-174042| 600 600 600 600 600| 0241+622 18254-175148| 170 151 151 170| 2329-415 18254-175354| 97 97 | End of listing. =========================================================== Last observations Observation listing from file ./rd1807.skd for experiment RD1807 Source Start DURATIONS name yyddd-hhmmss Ft Hh Ho Kk Ma Ny Wz 3C48 18255-170403| 600 600 600 600| 1749+096 18255-170542| 59 40 59 | 1936-155 18255-170831| 45 40 45 | 1639-062 18255-171205| 207 72 207 | 2145+082 18255-171727| 491 491 491 347 352| 0059+581 18255-172409| 142 136 142| 1803+784 18255-172728| 142 142 142 142| 3C446 18255-172730| 140 140 | End of listing. =========================================================== SKED Summary from file ./rd1807.skd for experiment RD1807 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 7.8 Min = 0.0 Max = 188.9 (Baseline Ft-Ny on 1749+096) RMS = 12.4 Total time: 1440 minutes ( 24.0 hours). Key: Ft=FORTLEZA Hh=HARTRAO Ho=HOBART26 Kk=KOKEE Ma=MATERA Ny=NYALES20 Wz=WETTZELL Ft Hh Ho Kk Ma Ny Wz Avg % obs. time: 33 53 53 57 64 65 70 56 % cal. time: 2 2 2 2 2 2 2 2 % slew time: 25 34 26 13 18 11 7 19 % idle time: 39 10 19 27 15 22 20 22 total # scans: 150 162 154 182 187 185 179 171 # scans/hour : 6 7 6 8 8 8 7 7 Avg scan (sec): 193 284 297 270 295 302 337 282 # data tracks: 32 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 32 Total TB(M5): 3.70 5.89 5.85 6.28 7.07 7.15 7.73 6.24 # OF OBSERVATIONS BY BASELINE | Ft Hh Ho Kk Ma Ny Wz Total --------------------------------------------- Ft| 66 14 41 91 67 67 346 Hh| 52 0 104 46 87 355 Ho| 94 31 29 24 244 Kk| 38 93 48 314 Ma| 106 132 502 Ny| 114 455 Wz| 472 Number of 2-station scans: 187 Number of 3-station scans: 117 Number of 4-station scans: 71 Number of 5-station scans: 38 Number of 6-station scans: 0 Number of 7-station scans: 0 Total number of scans: 413 Total number of obs: 1344 Total integrated obs-time: 360217 Average obs-time: 268.0 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: | 255| 100| 66| 114| 94| 46| 54| 61| 43| 39| 33| 40| 52| 34| 20| 22| 11| 51| 209| Average X-band SNRs by baseline | Ft Hh Ho Kk Ma Ny Wz AVG -------------------------------------------- Ft| 30 24 26 35 42 57 38 Hh| 41 - 53 38 65 48 Ho| 28 32 29 39 32 Kk| 51 64 69 47 Ma| 106 115 76 Ny| 137 84 Wz| 94 Average S-band SNRs by baseline | Ft Hh Ho Kk Ma Ny Wz AVG -------------------------------------------- Ft| 20 17 29 19 23 27 23 Hh| 32 - 30 30 35 30 Ho| 30 21 20 24 27 Kk| 44 47 49 39 Ma| 42 45 35 Ny| 52 40 Wz| 42 =========================================================== 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 MATERA 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 Kk KOKEE Mark5B Ma MATERA 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 Kk Ma Ny Ft Hh Ho Kk Ma Ny Hh 20 Hh 15 Ho 20 20 Ho 15 15 Kk 20 20 20 Kk 15 15 15 Ma 20 20 20 20 Ma 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 ===========================================================