Session Notes for rd1909 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 RD1909, we schedule all of these 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 I19254 during the time from 1815 UT to 1945 UT. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD1909 Description R&D-09/2019 Scheduler: NASA Correlator: SHAO Start: 2019-254-18:00:00 End: 2019-255-18:00:00 Current yyyyddd: 2019254 (2019.70) ( 18738 MJD, WED. 11SEP.) Greenwich sidereal time: 17:21:52 (18:00:00 UT) Sun's RA and DEC: 11h 18.5m 4d 27.8 =========================================================== First observations Observation listing from file ./rd1909.skd for experiment RD1909 Source Start DURATIONS name yyddd-hhmmss Ft Hh Ho Kk Mc Ny On T6 Wz 0823-223 19254-180000| 231 231 | 1923+210 19254-180000| 600 507 374 600 600 507 443| 2208-137 19254-180822| 115 115 96| 0716+714 19254-181049| 40 40| 0133+476 19254-181224| 40 40| 1725+123 19254-181224| 436 219 267 311 436 | 0016+731 19254-181348| 72 72| 1514+197 19254-181828| 93 105 105 | 0312+100 19254-181844| 221 221 | 1330+476 19254-182149| 600 585 600 600 | End of listing. =========================================================== Observation listing from file ./rd1909.skd for experiment RD1909 Source Start DURATIONS name yyddd-hhmmss Ft Hh Ho Kk Mc Ny On T6 Wz 0805+410 19255-173134| 182 40 182 133| 1514+197 19255-173145| 92 92 | 1908-201 19255-173643| 600 485 600 | 3C48 19255-174000| 600 600 600 487 185 460| 2155+312 19255-174819| 45 195 112 195| 3C274 19255-175317| 393 393 73 103 122 85| 2329-415 19255-175325| 100 97 100 | 1215+303 19255-175517| 273 273| 1101+384 19255-175606| 145 145 | 0316-444 19255-175654| 68 68 | 0131-522 19255-175919| 31 31 | End of listing. =========================================================== SKED Summary from file ./rd1909.skd for experiment RD1909 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 6.9 Min = 0.0 Max = 96.0 (Baseline Ho-On on 0823-223) RMS = 7.8 Total time: 1440 minutes ( 24.0 hours). Key: Ft=FORTLEZA Hh=HARTRAO Ho=HOBART26 Kk=KOKEE Mc=MEDICINA Ny=NYALES20 On=ONSALA60 T6=TIANMA65 Wz=WETTZELL Ft Hh Ho Kk Mc Ny On T6 Wz Avg % obs. time: 55 49 52 59 63 72 72 43 72 60 % cal. time: 2 2 2 2 2 2 2 3 2 2 % slew time: 22 35 27 14 28 12 12 41 7 22 % idle time: 19 13 18 24 5 13 13 12 18 16 total # scans: 157 158 174 200 201 203 172 232 214 190 # scans/hour : 7 7 7 8 8 8 7 10 9 8 Avg scan (sec): 305 268 261 256 272 307 361 160 291 275 # 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): 6.13 5.42 5.80 6.55 7.00 7.99 7.96 4.75 7.96 6.62 # OF OBSERVATIONS BY BASELINE | Ft Hh Ho Kk Mc Ny On T6 Wz Total ------------------------------------------------------- Ft| 61 11 49 98 89 102 49 97 556 Hh| 55 0 78 61 63 65 83 466 Ho| 87 23 23 18 75 25 317 Kk| 69 96 60 103 81 545 Mc| 166 147 112 177 870 Ny| 142 128 161 866 On| 96 138 766 T6| 126 754 Wz| 888 Number of 2-station scans: 194 Number of 3-station scans: 79 Number of 4-station scans: 35 Number of 5-station scans: 57 Number of 6-station scans: 60 Number of 7-station scans: 43 Number of 8-station scans: 0 Number of 9-station scans: 0 Total number of scans: 468 Total number of obs: 3014 Total integrated obs-time: 754565 Average obs-time: 250.4 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: | 471| 319| 295| 219| 183| 174| 113| 85| 78| 89| 118| 103| 91| 91| 72| 42| 41| 54| 376| Average X-band SNRs by baseline | Ft Hh Ho Kk Mc Ny On T6 Wz AVG ------------------------------------------------------ Ft| 51 62 36 47 46 38 195 65 61 Hh| 50 - 49 48 40 144 66 64 Ho| 41 35 42 35 158 49 71 Kk| 60 62 48 236 82 90 Mc| 89 81 299 121 109 Ny| 83 354 136 125 On| 255 111 96 T6| 428 282 Wz| 149 Average S-band SNRs by baseline | Ft Hh Ho Kk Mc Ny On T6 Wz AVG ------------------------------------------------------ Ft| 30 25 33 23 23 19 92 31 32 Hh| 33 - 32 29 30 80 38 39 Ho| 35 19 20 18 69 22 38 Kk| 52 49 42 176 65 71 Mc| 38 36 124 52 50 Ny| 37 139 53 54 On| 112 48 45 T6| 164 127 Wz| 64 =========================================================== 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 MEDICINA NYALES20 ONSALA60 TIANMA65 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 Mc MEDICINA 17640feet (Thin ) 56250 (HIGH ) 14 Ny NYALES20 Mark5B On ONSALA60 17640feet (Thin ) 56250 (HIGH ) 14 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) Ft Hh Ho Kk Mc Ny On T6 Ft Hh Ho Kk Mc Ny On T6 Hh 20 Hh 15 Ho 20 20 Ho 15 15 Kk 20 20 20 Kk 15 15 15 Mc 20 20 20 20 Mc 15 15 15 15 Ny 20 20 20 20 20 Ny 15 15 15 15 15 On 20 20 20 20 20 20 On 15 15 15 15 15 15 T6 20 20 20 20 20 20 20 T6 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 ===========================================================