Session Notes for rd1809 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 RD1809, 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 RD1809, we focus on scheduling each source on at least 3 scans. For this reason only 18 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. The SEFDs for the station Ny were increased by a factor of 3 for X-band and 2 for S-band as the station has been running warm. Wettzell and Kokee will observe INT I18332 during the time from 1815 UT to 1945 UT. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD1809 Description R&D-11/2018 Scheduler: NASA Correlator: SHAO Start: 2018-332-18:00:00 End: 2018-333-18:00:00 Current yyyyddd: 2018332 (2018.91) ( 18451 MJD, WED. 28NOV.) Greenwich sidereal time: 22:30:20 (18:00:00 UT) Sun's RA and DEC: 16h 18.4m -21d 23.0 =========================================================== First observations Observation listing from file ./rd1809.skd for experiment RD1809 Source Start DURATIONS name yyddd-hhmmss Ft Hh Ho Kk Ma Ny Wz 3C446 18332-180000| 256 256 40 40 99| 0748+126 18332-180212| 40 40 40 | 1053+704 18332-180301| 45 45| 1330+476 18332-180425| 437 450 450| 1758-651 18332-180654| 146 146 | 1806+456 18332-181240| 140 140 140| 0410+110 18332-181341| 406 428 600 600 | End of listing. =========================================================== Last observations Observation listing from file ./rd1809.skd for experiment RD1809 Source Start DURATIONS name yyddd-hhmmss Ft Hh Ho Kk Ma Ny Wz 0410+110 18333-172647| 392 524 524 509 517| 2145+082 18333-173629| 427 427| 2329-415 18333-173719| 492 454 492 | 1348+308 18333-174459| 344 344 | 2155-304 18333-174704| 345 295 337 345| 1349-439 18333-175200| 179 179 | 1954-388 18333-175417| 333 333 | 1806+456 18333-175430| 45 45 45| 0016+731 18333-175642| 188 188 188| 0823-223 18333-175725| 145 145 | End of listing. =========================================================== SKED Summary from file ./rd1809.skd for experiment RD1809 (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 = 68.6 (Baseline Ft-Kk on 2155-304) RMS = 10.3 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: 45 49 59 55 64 56 69 57 % cal. time: 2 2 2 2 2 2 2 2 % slew time: 29 34 29 11 19 11 8 21 % idle time: 23 14 9 31 14 30 20 21 total # scans: 171 157 168 164 197 168 202 175 # scans/hour : 7 7 7 7 8 7 8 7 Avg scan (sec): 226 271 304 291 279 291 294 278 # data tracks: 32 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 32 Total TB(M5): 4.94 5.45 6.53 6.10 7.05 6.25 7.60 6.27 # OF OBSERVATIONS BY BASELINE | Ft Hh Ho Kk Ma Ny Wz Total --------------------------------------------- Ft| 61 48 38 79 69 75 370 Hh| 73 0 95 33 78 340 Ho| 68 36 14 25 264 Kk| 40 78 67 291 Ma| 105 142 497 Ny| 112 411 Wz| 499 Number of 2-station scans: 186 Number of 3-station scans: 130 Number of 4-station scans: 85 Number of 5-station scans: 25 Number of 6-station scans: 0 Number of 7-station scans: 0 Total number of scans: 426 Total number of obs: 1336 Total integrated obs-time: 356148 Average obs-time: 266.6 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: | 283| 93| 75| 125| 57| 50| 39| 34| 60| 27| 47| 31| 45| 51| 37| 26| 15| 43| 198| Average X-band SNRs by baseline | Ft Hh Ho Kk Ma Ny Wz AVG -------------------------------------------- Ft| 35 25 33 44 28 61 39 Hh| 33 - 49 35 66 45 Ho| 30 33 32 41 31 Kk| 47 40 69 44 Ma| 52 113 66 Ny| 78 51 Wz| 80 Average S-band SNRs by baseline | Ft Hh Ho Kk Ma Ny Wz AVG -------------------------------------------- Ft| 23 20 31 20 18 27 23 Hh| 31 - 28 25 35 29 Ho| 31 21 18 25 26 Kk| 34 36 53 38 Ma| 25 40 29 Ny| 37 29 Wz| 37 =========================================================== 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 ===========================================================