Session Notes for rd1806 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 RD1806, 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 source 3C48 is added to the astro set of sources to monitor the position. In RD1806, we focus on scheduling each source on at least 3 scans. For this reason only seventeen 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. The station Onsala60 is tagged along. We use a 1Gbps wide-band mode currently used to schedule AOV sessions. Wettzell and Kokee will observe INT I18234 during the time from 1815 UT to 1945 UT. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD1806 Description R&D-08/2018 Scheduler: NASA Correlator: HAYS Start: 2018-234-18:00:00 End: 2018-235-18:00:00 Current yyyyddd: 2018234 (2018.64) ( 18353 MJD, WED. 22AUG.) Greenwich sidereal time: 16:03:58 (18:00:00 UT) Sun's RA and DEC: 10h 6.8m 11d 36.7 =========================================================== First observations Observation listing from file ./rd1806.skd for experiment RD1806 Source Start DURATIONS name yyddd-hhmmss Hh Ho Kk Mc Ny Wz On 2209+236 18234-180000| 40 81 60 90 90 | 0059+581 18234-180229| 54 40 52 77 77| 0613+570 18234-180426| 40 40 50 50 | 2314-409 18234-180436| 302 302 | 0821+394 18234-180606| 165 88 62 165 | 1330+476 18234-180948| 168 168 127 | 2155-304 18234-181129| 163 163 | End of listing. =========================================================== Last observations Observation listing from file ./rd1806.skd for experiment RD1806 Source Start DURATIONS name yyddd-hhmmss Hh Ho Kk Mc Ny Wz On 2155-304 18235-172524| 86 86 | 1803+784 18235-172607| 146 58 40 98 146| 1104+728 18235-172823| 419 452 452 | 3C446 18235-172900| 40 40 | 0048-097 18235-173127| 40 40 | 0054+161 18235-173340| 73 73 | 1125+366 18235-173645| 600 600 600 600 | 2145+082 18235-175118| 512 512 512 313 512 | 0307+380 18235-175735| 135 135 | End of listing. =========================================================== SKED Summary from file ./rd1806.skd for experiment RD1806 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 7.7 Min = 0.0 Max = 102.9 (Baseline Hh-Ho on 2209+236) RMS = 10.7 Total time: 1440 minutes ( 24.0 hours). Key: Hh=HARTRAO Ho=HOBART26 Kk=KOKEE Mc=MEDICINA Ny=NYALES20 Wz=WETTZELL On=ONSALA60 Hh Ho Kk Mc Ny Wz On Avg % obs. time: 46 49 52 63 66 72 11 51 % cal. time: 2 2 2 3 3 3 1 2 % slew time: 34 22 10 29 13 7 3 18 % idle time: 17 26 35 5 17 17 84 29 total # scans: 176 140 178 238 235 247 51 180 # scans/hour : 7 6 7 10 10 10 2 8 Avg scan (sec): 226 302 252 229 244 252 191 241 # data tracks: 32 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 32 Total TB(M5): 5.10 5.42 5.74 6.97 7.33 7.98 1.25 5.68 # OF OBSERVATIONS BY BASELINE | Hh Ho Kk Mc Ny Wz On Total --------------------------------------------- Hh| 47 0 150 92 129 20 438 Ho| 89 35 35 26 2 234 Kk| 62 110 86 30 377 Mc| 173 210 42 672 Ny| 190 38 638 Wz| 44 685 On| 176 Number of 2-station scans: 115 Number of 3-station scans: 104 Number of 4-station scans: 133 Number of 5-station scans: 37 Number of 6-station scans: 1 Number of 7-station scans: 0 Total number of scans: 390 Total number of obs: 1610 Total integrated obs-time: 332291 Average obs-time: 206.4 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: | 444| 157| 127| 110| 96| 60| 94| 65| 55| 44| 27| 35| 37| 31| 28| 29| 29| 14| 128| Average X-band SNRs by baseline | Hh Ho Kk Mc Ny Wz On AVG -------------------------------------------- Hh| 40 - 39 35 51 92 44 Ho| 31 33 34 46 106 36 Kk| 43 59 72 97 56 Mc| 66 84 154 67 Ny| 98 197 76 Wz| 235 88 On| 166 Average S-band SNRs by baseline | Hh Ho Kk Mc Ny Wz On AVG -------------------------------------------- Hh| 30 - 22 20 26 35 24 Ho| 30 20 19 24 54 26 Kk| 35 45 52 73 43 Mc| 28 36 61 32 Ny| 40 79 36 Wz| 95 41 On| 72 =========================================================== Recording mode Name Code AOVSX16W SX Recording mode for: HARTRAO HOBART26 KOKEE 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 Hh HARTRAO Mark5B Ho HOBART26 Mark5B Kk KOKEE Mark5B Mc MEDICINA Mark5B Ny NYALES20 Mark5B On ONSALA60 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) Hh Ho Kk Mc Ny Wz Hh Ho Kk Mc Ny Wz Ho 20 Ho 15 Kk 20 20 Kk 15 15 Mc 20 20 20 Mc 15 15 15 Ny 20 20 20 20 Ny 15 15 15 15 Wz 20 20 20 20 20 Wz 15 15 15 15 15 On 20 20 20 20 20 20 On 15 15 15 15 15 15 ===========================================================