Session Notes for rd1905 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 RD1905, we schedule 28 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 command fill is used with an offset of 10 seconds. We added the source 3C48 to the set of sources in the ASTRO section to monitor its position. We use a modified version of the 1Gbps wide-band mode currently used to schedule AOV sessions. Wettzell and Kokee will observe INT I19177 during the time from 1815 UT to 1945 UT. Wettzell will observe INT W19178 during the time from 0700 UT to 0930 UT. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD1905 Description R&D-06/2019 Scheduler: NASA Correlator: SHAO Start: 2019-177-18:00:00 End: 2019-178-18:00:00 Current yyyyddd: 2019177 (2019.48) ( 18661 MJD, WED. 26JUN.) Greenwich sidereal time: 12:18:17 (18:00:00 UT) Sun's RA and DEC: 6h 21.2m 23d 20.8 =========================================================== First observations Observation listing from file ./rd1905.skd for experiment RD1905 Source Start DURATIONS name yyddd-hhmmss Ft Hh Ho Kk Km Mc Ny On Wz 1144+402 19177-180000| 118 40 40 79 92 118| 3C446 19177-180000| 40 40 40 | 0241+622 19177-180259| 114 364 206 365 365 151| 1424-418 19177-180523| 120 69 120 | 0442+389 19177-180556| 274 274| 1348+308 19177-181100| 471 172 506 539 539 | 0805+410 19177-181115| 47 40 47| End of listing. =========================================================== Last observations Observation listing from file ./rd1905.skd for experiment RD1905 Source Start DURATIONS name yyddd-hhmmss Ft Hh Ho Kk Km Mc Ny On Wz 1330+476 19178-172654| 600 286 540 540 600 494| 1741-038 19178-173624| 56 40 47 56| 0602+673 19178-173831| 600 600 252 334 506 367| 2029+024 19178-173900| 223 223 | 1520+319 19178-174551| 183 40 106 73 183| 1929+226 19178-174951| 101 170 92 102 70 156 170| 2155-304 19178-175354| 128 128 106 | 1354-152 19178-175400| 350 350 350 307 140| 0151+474 19178-175745| 125 125 112 125| End of listing. =========================================================== SKED Summary from file ./rd1905.skd for experiment RD1905 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 6.6 Min = 0.0 Max = 48.8 (Baseline Km-On on 0823-223) RMS = 8.0 Total time: 1440 minutes ( 24.0 hours). Key: Ft=FORTLEZA Hh=HARTRAO Ho=HOBART26 Kk=KOKEE Km=KUNMING Mc=MEDICINA Ny=NYALES20 On=ONSALA60 Wz=WETTZELL Ft Hh Ho Kk Km Mc Ny On Wz Avg % obs. time: 55 51 53 58 57 68 69 72 64 61 % cal. time: 2 2 2 2 3 2 2 2 2 2 % slew time: 22 36 31 14 32 24 12 11 7 22 % idle time: 20 9 13 25 7 5 16 14 26 15 total # scans: 150 177 200 201 263 188 204 170 193 194 # scans/hour : 6 7 8 8 11 8 9 7 8 8 Avg scan (sec): 318 251 228 247 187 312 292 368 285 276 # data tracks: 32 32 32 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 32 32 32 Total TB(M5): 6.11 5.68 5.84 6.36 6.31 7.51 7.61 8.00 7.05 6.72 # OF OBSERVATIONS BY BASELINE | Ft Hh Ho Kk Km Mc Ny On Wz Total ------------------------------------------------------- Ft| 74 16 43 48 79 70 85 75 490 Hh| 73 0 94 84 65 78 76 544 Ho| 91 109 23 32 23 23 390 Kk| 108 68 95 61 80 546 Km| 131 148 111 138 887 Mc| 159 149 151 844 Ny| 139 146 854 On| 127 773 Wz| 816 Number of 2-station scans: 172 Number of 3-station scans: 102 Number of 4-station scans: 33 Number of 5-station scans: 56 Number of 6-station scans: 72 Number of 7-station scans: 36 Number of 8-station scans: 0 Number of 9-station scans: 0 Total number of scans: 471 Total number of obs: 3072 Total integrated obs-time: 815993 Average obs-time: 265.6 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: | 625| 236| 230| 169| 106| 152| 103| 131| 154| 90| 119| 62| 64| 104| 68| 47| 53| 62| 497| Average X-band SNRs by baseline | Ft Hh Ho Kk Km Mc Ny On Wz AVG ------------------------------------------------------ Ft| 45 36 36 58 43 42 37 68 47 Hh| 40 - 63 56 47 41 71 52 Ho| 33 52 37 36 27 48 41 Kk| 67 46 57 37 68 51 Km| 92 102 70 141 86 Mc| 84 66 110 76 Ny| 68 119 79 On| 88 61 Wz| 100 Average S-band SNRs by baseline | Ft Hh Ho Kk Km Mc Ny On Wz AVG ------------------------------------------------------ Ft| 27 28 33 33 21 21 19 31 26 Hh| 32 - 47 33 30 27 42 34 Ho| 33 35 23 21 19 26 30 Kk| 66 39 45 33 49 45 Km| 49 52 38 67 50 Mc| 35 30 44 37 Ny| 30 43 37 On| 35 30 Wz| 45 =========================================================== 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 KUNMING 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 Ft FORTLEZA Mark5A Hh HARTRAO Mark5B Ho HOBART26 Mark5B Kk KOKEE Mark5B Km KUNMING Mark5B Mc MEDICINA 17640feet (Thin ) 56250 (HIGH ) 14 Ny NYALES20 Mark5B On ONSALA60 17640feet (Thin ) 56250 (HIGH ) 14 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 Km Mc Ny On Ft Hh Ho Kk Km Mc Ny On Hh 20 Hh 15 Ho 20 20 Ho 15 15 Kk 20 20 20 Kk 15 15 15 Km 20 20 20 20 Km 15 15 15 15 Mc 20 20 20 20 20 Mc 15 15 15 15 15 Ny 20 20 20 20 20 20 Ny 15 15 15 15 15 15 On 20 20 20 20 20 20 20 On 15 15 15 15 15 15 15 Wz 20 20 20 20 20 20 20 20 Wz 15 15 15 15 15 15 15 15 ===========================================================