Session Notes for rd1802 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 RD1802, we schedule all thirty sources in the astro mode of sked. We used a maxscan value of 480 seconds. Forty of the good geodetic sources are used as base of a stable source set and uniform sky coverage. We use the sked flux catalog for all sources. Wettzell and Kokee will observe INT I18030 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: RD1802 Description R&D-01/2018 Scheduler: NASA Correlator: SHAO Start: 2018-030-17:30:00 End: 2018-031-17:30:00 Current yyyyddd: 2018030 (2018.08) ( 18149 MJD, TUES 30JAN.) Greenwich sidereal time: 02:09:36 (17:30:00 UT) Sun's RA and DEC: 20h 52.9m -17d 31.7 =========================================================== First observations Observation listing from file ./rd1802.skd for experiment RD1802 Source Start DURATIONS name yyddd-hhmmss Hh Ho Kk Mc Ny T6 Wz 1803+784 18030-173000| 157 40 160 86 160| 1504+377 18030-173329| 194 194 171 | 0627-199 18030-173403| 239 124 315 315| 1349-439 18030-173914| 480 480 | 0544+273 18030-174116| 114 144 191 199 199| 0410+110 18030-174511| 291 342 395 395| End of listing. =========================================================== Observation listing from file ./rd1802.skd for experiment RD1802 Source Start DURATIONS name yyddd-hhmmss Hh Ho Kk Mc Ny T6 Wz 0528-250 18031-171039| 480 295 480 194| 1330+476 18031-171453| 347 347| 1333-337 18031-171513| 138 138 | 1333-152 18031-171845| 480 480 199 | 0410+110 18031-172142| 287 302 302| 1215+303 18031-172510| 98 98 | 1324+224 18031-172840| 75 75 75 | 0202+319 18031-172852| 63 63 63 63| End of listing. =========================================================== SKED Summary from file ./rd1802.skd for experiment RD1802 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 4.2 Min = 0.0 Max = 54.7 (Baseline Kk-T6 on 0316-444) RMS = 6.4 Total time: 1440 minutes ( 24.0 hours). Key: Hh=HARTRAO Ho=HOBART26 Kk=KOKEE Mc=MEDICINA Ny=NYALES20 T6=TIANMA65 Wz=WETTZELL Hh Ho Kk Mc Ny T6 Wz Avg % obs. time: 50 56 53 59 61 46 65 56 % cal. time: 2 2 2 2 2 3 2 2 % slew time: 31 19 9 27 11 43 8 22 % idle time: 16 22 36 10 25 7 24 21 total # scans: 147 139 138 187 180 218 198 172 # scans/hour : 6 6 6 8 8 9 8 7 Avg scan (sec): 295 348 329 275 293 183 285 286 # data tracks: 32 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 32 Total TB(M5): 2.78 3.09 2.90 3.29 3.38 2.56 3.61 3.09 # OF OBSERVATIONS BY BASELINE | Hh Ho Kk Mc Ny T6 Wz Total --------------------------------------------- Hh| 55 0 79 35 56 73 298 Ho| 66 7 6 98 12 244 Kk| 33 42 97 32 270 Mc| 109 52 141 421 Ny| 71 129 392 T6| 46 420 Wz| 433 Number of 2-station scans: 161 Number of 3-station scans: 197 Number of 4-station scans: 52 Number of 5-station scans: 16 Number of 6-station scans: 1 Number of 7-station scans: 0 Total number of scans: 427 Total number of obs: 1239 Total integrated obs-time: 308965 Average obs-time: 249.4 Histogram of observation durations Dur: 25 50 75 100 125 150 175 200 225 250 275 300 325 350 375 400 425 450 475 500 #Obs: | 141| 78| 74| 72| 92| 78| 60| 65| 52| 26| 39| 14| 29| 34| 46| 23| 49| 24| 243 Average X-band SNRs by baseline | Hh Ho Kk Mc Ny T6 Wz AVG -------------------------------------------- Hh| 26 - 38 40 90 54 50 Ho| 22 22 31 86 32 49 Kk| 28 48 103 67 61 Mc| 58 141 76 68 Ny| 252 95 102 T6| 413 161 Wz| 112 Average S-band SNRs by baseline | Hh Ho Kk Mc Ny T6 Wz AVG -------------------------------------------- Hh| 26 - 22 20 50 26 29 Ho| 20 22 16 40 21 29 Kk| 22 35 80 45 47 Mc| 23 62 28 29 Ny| 93 34 40 T6| 154 75 Wz| 44 =========================================================== Recording mode Name Code GEOSX8N 8F Recording mode for: HARTRAO HOBART26 KOKEE MEDICINA NYALES20 TIANMA65 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 Mark5B Kk KOKEE Mark5B Mc MEDICINA Mark5B Ny NYALES20 Mark5B T6 TIANMA65 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 T6 Hh Ho Kk Mc Ny T6 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 T6 20 20 20 20 20 T6 15 15 15 15 15 Wz 20 20 20 20 20 20 Wz 15 15 15 15 15 15 ===========================================================