Session Notes for rd1705 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 RD1705, we could schedule twenty-six of the sources in the astro mode of sked. The other four sources are too weak to be possibly observed with this session network. We used a maxscan value of 620 seconds. Forty of the good geodetic sources are used as base of a stable sources set and uniform sky coverage. We use the sked flux catalog for all sources. Wettzell will observe INT I17109 during the time from 1815 UT to 1945 UT. The command FILL was used on all stations and on the entire period with a fill_off (buffer offset) of 5 seconds. ----- Parameter listing -------------------------------------- Experiment: RD1705 Description R&D-04/2017 Scheduler: NASA Correlator: SHAO Start: 2017-109-17:30:00 End: 2017-110-17:30:00 Current yyyyddd: 2017109 (2017.30) ( 17863 MJD, WED. 19APR.) Greenwich sidereal time: 07:22:01 (17:30:00 UT) Sun's RA and DEC: 1h 51.1m 11d 25.0 =========================================================== First observations Observation listing from file ./rd1705.skd for experiment RD1705 Source Start DURATIONS name yyddd-hhmmss Hh Ho Km Mc Ny On Wz 1324+224 17109-173000| 124 112 205 157 195 191 205| 1803+784 17109-173425| 125 126 40 126| 1144-379 17109-173549| 47 40 47 | 0241+622 17109-173748| 171 148 107 171| 1334-127 17109-173851| 620 620 40 | 1104+728 17109-174214| 418 620 620 620 620| End of listing. =========================================================== Last observations Observation listing from file ./rd1705.skd for experiment RD1705 Source Start DURATIONS name yyddd-hhmmss Hh Ho Km Mc Ny On Wz 1330+476 17110-170125| 459 459 394| 1333-337 17110-170147| 529 529 329 | 0823+033 17110-170858| 106 177 177| 1333-152 17110-171227| 620 620 620 | 0410+110 17110-171243| 620 615 620| 1143-332 17110-172459| 296 296 | 0823-223 17110-172705| 170 170 170 170| End of listing. =========================================================== SKED Summary from file ./rd1705.skd for experiment RD1705 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 4.3 Min = 0.0 Max = 46.5 (Baseline Hh-Ho on 1324+224) RMS = 7.0 Total time: 1440 minutes ( 24.0 hours). Key: Hh=HARTRAO Ho=HOBART26 Km=KUNMING Mc=MEDICINA Ny=NYALES20 On=ONSALA60 Wz=WETTZELL Hh Ho Km Mc Ny On Wz Avg % obs. time: 59 51 70 63 72 45 73 62 % cal. time: 2 2 2 2 2 2 2 2 % slew time: 27 18 19 29 14 13 7 19 % idle time: 12 28 8 5 11 38 17 18 total # scans: 137 133 182 214 204 178 201 178 # scans/hour : 6 6 8 9 9 7 8 7 Avg scan (sec): 370 332 332 253 305 220 312 302 # data tracks: 32 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 32 Total TB(M5): 3.2 2.8 3.9 3.5 4.0 2.5 4.0 3.4 # OF OBSERVATIONS BY BASELINE | Hh Ho Km Mc Ny On Wz Total --------------------------------------------- Hh| 70 86 62 24 27 49 318 Ho| 101 14 23 7 13 228 Km| 54 59 36 62 398 Mc| 136 143 136 545 Ny| 128 137 507 On| 123 464 Wz| 520 Number of 2-station scans: 104 Number of 3-station scans: 188 Number of 4-station scans: 71 Number of 5-station scans: 36 Number of 6-station scans: 1 Number of 7-station scans: 1 Total number of scans: 401 Total number of obs: 1490 Total integrated obs-time: 399560 Average obs-time: 268.2 Histogram of observation durations Dur: 30 60 90 120 150 180 210 240 270 300 330 360 390 420 450 480 510 540 570 600 630 #Obs: | 302| 116| 178| 94| 71| 46| 50| 54| 28| 32| 19| 28| 28| 39| 35| 26| 27| 21| 27| 269 Average X-band SNRs by baseline | Hh Ho Km Mc Ny On Wz AVG -------------------------------------------- Hh| 30 34 29 33 32 37 32 Ho| 38 30 25 47 41 34 Km| 42 47 56 67 45 Mc| 60 53 73 55 Ny| 61 79 61 On| 75 60 Wz| 70 Average S-band SNRs by baseline | Hh Ho Km Mc Ny On Wz AVG -------------------------------------------- Hh| 32 26 21 23 23 24 26 Ho| 37 24 22 31 28 33 Km| 27 30 34 39 32 Mc| 23 24 32 26 Ny| 27 33 27 On| 34 28 Wz| 33 =========================================================== Recording mode Name Code GEOSX8N 8F Recording mode for: HARTRAO HOBART26 KUNMING MEDICINA NYALES20 ONSALA60 WETTZELL Mode Tot.Rate Tot.BandW #BBC #bits Barrel Mk341:1 512 Mbits 128 MHz 14 2 NONE Chan.BW #Subpasses Tracks(*fan) Tot.tracks 8.00 MHz 1 32(*1) 32 X-band spanned bw= 720.0 MHz rms spanned bw= 280.4 MHz S-band spanned bw= 140.0 MHz rms spanned bw= 50.9 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 Mark5A Km KUNMING 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 Km Mc Ny On Hh Ho Km Mc Ny On Ho 20 Ho 15 Km 20 20 Km 15 15 Mc 20 20 20 Mc 15 15 15 Ny 20 20 20 20 Ny 15 15 15 15 On 20 20 20 20 20 On 15 15 15 15 15 Wz 20 20 20 20 20 20 Wz 15 15 15 15 15 15 ===========================================================