Session Notes for rd1804 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 RD1805, we schedule 24 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 RD1805, we focus on scheduling each source on at least 3 scans. For this reason only sixteen of the good geodetic sources are used as base of a stable source set and uniform sky coverage. We did not use the sked command fill to keep the media size at its minimum. The station Sheshan may not participate due to antenna problems so it is tagged along in RD1805. We use a 1Gbps wide-band mode currently used to schedule AOV sessions. Wettzell and Kokee will observe INT I18192 during the time from 1815 UT to 1945 UT. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD1805 Description R&D-07/2018 Scheduler: NASA Correlator: HAYS Start: 2018-192-18:00:00 End: 2018-193-18:00:00 Current yyyyddd: 2018192 (2018.53) ( 18311 MJD, WED. 11JUL.) Greenwich sidereal time: 13:18:23 (18:00:00 UT) Sun's RA and DEC: 7h 23.9m 22d 2.1 =========================================================== First observations Observation listing from file ./rd1805.skd for experiment RD1805 Source Start DURATIONS name yyddd-hhmmss Ft Hh Ho Kk Ny Wz Sh 2155+312 18192-180000| 122 122 85 86 62| 1441+252 18192-180247| 404 404 278 205 | 1053+704 18192-180836| 40 40 40 40| OJ287 18192-181232| 40 40 40 40 | 1657-261 18192-181413| 40 40 40 | 1215+303 18192-181854| 165 165 | 2029+024 18192-182745| 243 243 206| 1348+308 18192-183703| 223 223 | 1144+402 18192-184130| 67 67 | End of listing. =========================================================== Observation listing from file ./rd1805.skd for experiment RD1805 Source Start DURATIONS name yyddd-hhmmss Ft Hh Ho Kk Ny Wz Sh 1333-152 18193-173053| 575 575 | 2155-304 18193-173849| 148 148 76| 1333-337 18193-174219| 434 434 | IIIZW2 18193-174315| 555 555 | 1034-293 18193-175228| 164 164 | 0241+622 18193-175354| 54 87 87 77| 2329-415 18193-175635| 71 71 | 1330+476 18193-175707| 123 123 122| End of listing. =========================================================== SKED Summary from file ./rd1805.skd for experiment RD1805 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 7.2 Min = 0.0 Max = 62.6 (Baseline Hh-Ho on OJ287 ) RMS = 9.6 Total time: 1439 minutes ( 24.0 hours). Key: Ft=FORTLEZA Hh=HARTRAO Ho=HOBART26 Kk=KOKEE Ny=NYALES20 Wz=WETTZELL Sh=SESHAN25 Ft Hh Ho Kk Ny Wz Sh Avg % obs. time: 18 47 49 53 56 54 27 43 % cal. time: 1 2 2 3 3 3 2 2 % slew time: 19 39 29 15 15 9 17 21 % idle time: 61 11 19 29 26 34 53 34 total # scans: 102 182 198 226 218 228 139 184 # scans/hour : 4 8 8 9 9 10 6 8 Avg scan (sec): 148 223 212 201 223 204 170 196 # data tracks: 32 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 32 Total TB(M5): 1.94 5.19 5.37 5.81 6.22 5.94 3.03 4.79 # OF OBSERVATIONS BY BASELINE | Ft Hh Ho Kk Ny Wz Sh Total --------------------------------------------- Ft| 51 12 30 55 66 11 225 Hh| 68 0 75 108 45 347 Ho| 125 28 17 66 316 Kk| 118 97 82 452 Ny| 183 91 550 Wz| 84 555 Sh| 379 Number of 2-station scans: 170 Number of 3-station scans: 160 Number of 4-station scans: 92 Number of 5-station scans: 21 Number of 6-station scans: 0 Number of 7-station scans: 0 Total number of scans: 443 Total number of obs: 1412 Total integrated obs-time: 263405 Average obs-time: 186.5 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: | 453| 156| 81| 90| 98| 74| 81| 42| 28| 27| 53| 22| 13| 25| 20| 25| 27| 20| 77| Average X-band SNRs by baseline | Ft Hh Ho Kk Ny Wz Sh AVG -------------------------------------------- Ft| 43 29 24 46 48 46 42 Hh| 36 - 63 93 36 61 Ho| 31 61 107 81 49 Kk| 44 46 55 41 Ny| 122 86 81 Wz| 92 90 Sh| 73 Average S-band SNRs by baseline | Ft Hh Ho Kk Ny Wz Sh AVG -------------------------------------------- Ft| 21 17 17 21 21 15 20 Hh| 27 - 31 36 23 29 Ho| 29 24 28 30 28 Kk| 29 29 35 29 Ny| 34 25 29 Wz| 27 31 Sh| 28 =========================================================== 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 NYALES20 SESHAN25 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 Ny NYALES20 Mark5B Sh SESHAN25 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 Ny Wz Ft Hh Ho Kk Ny Wz Hh 20 Hh 15 Ho 20 20 Ho 15 15 Kk 20 20 20 Kk 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 Sh 20 20 20 20 20 20 Sh 15 15 15 15 15 15 ===========================================================