Session Notes for rd1910 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 RD1910, we schedule twenty-two 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 I19268 during the time from 1815 UT to 1945 UT. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD1910 Description R&D-09/2019 Scheduler: NASA Correlator: HAYS Start: 2019-268-18:00:00 End: 2019-269-18:00:00 Current yyyyddd: 2019268 (2019.73) ( 18752 MJD, WED. 25SEP.) Greenwich sidereal time: 18:17:04 (18:00:00 UT) Sun's RA and DEC: 12h 8.7m 0d 56.8 =========================================================== First observations Observation listing from file ./rd1910.skd for experiment RD1910 Source Start DURATIONS name yyddd-hhmmss Ft Hh Ho Kb Kk Ma Ny On Wz 0133+476 19268-180000| 97 62 40 40 40 97| 1758-651 19268-180000| 129 129 129 | 1348+308 19268-180237| 318 600 464 600 441| 1057-797 19268-180334| 210 210 | 0528-250 19268-180947| 184 227 227 | 1923+210 19268-181129| 126 126 40| 1806+456 19268-181248| 132 132| 0410+110 19268-181451| 177 177 | 2029+024 19268-181536| 392 600 600 600 | End of listing. =========================================================== Last observations Observation listing from file ./rd1910.skd for experiment RD1910 Source Start DURATIONS name yyddd-hhmmss Ft Hh Ho Kb Kk Ma Ny On Wz 1806+456 19269-173204| 99 99 | 0528-250 19269-173351| 225 225 225 | 2029+024 19269-173503| 395 395 | 0415+398 19269-173942| 191 160 191| 1330+476 19269-174343| 600 499 600 542 600 600| 2314-409 19269-174436| 307 307 | 2155-304 19269-175134| 92 92 | 0716+714 19269-175502| 57 40 40 40 40 57| 2329-415 19269-175505| 97 97 | 1806+456 19269-175722| 148 87 61 99 148| 0458-020 19269-175915| 35 35 35 | End of listing. =========================================================== SKED Summary from file ./rd1910.skd for experiment RD1910 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 7.3 Min = 0.0 Max = 78.5 (Baseline Ft-Ny on 0458-020) RMS = 8.3 Total time: 1440 minutes ( 24.0 hours). Key: Ft=FORTLEZA Hh=HARTRAO Ho=HOBART26 Kb=KASHIM34 Kk=KOKEE Ma=MATERA Ny=NYALES20 On=ONSALA60 Wz=WETTZELL Ft Hh Ho Kb Kk Ma Ny On Wz Avg % obs. time: 51 55 58 60 56 71 71 72 71 63 % cal. time: 2 2 2 3 2 2 3 2 3 2 % slew time: 22 36 28 29 15 18 14 13 8 21 % idle time: 24 7 11 7 25 8 12 12 16 14 total # scans: 156 177 185 230 214 187 218 187 243 199 # scans/hour : 7 7 8 10 9 8 9 8 10 8 Avg scan (sec): 282 267 270 224 227 330 282 333 254 274 # 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): 5.63 6.06 6.38 6.59 6.21 7.90 7.87 7.98 7.91 6.95 # OF OBSERVATIONS BY BASELINE | Ft Hh Ho Kb Kk Ma Ny On Wz Total ------------------------------------------------------- Ft| 73 8 37 48 93 88 97 107 551 Hh| 61 44 0 99 77 85 104 543 Ho| 107 97 30 36 26 30 395 Kb| 151 87 126 100 120 772 Kk| 61 101 75 95 628 Ma| 146 152 166 834 Ny| 148 182 904 On| 151 834 Wz| 955 Number of 2-station scans: 146 Number of 3-station scans: 125 Number of 4-station scans: 50 Number of 5-station scans: 41 Number of 6-station scans: 66 Number of 7-station scans: 47 Number of 8-station scans: 0 Number of 9-station scans: 0 Total number of scans: 475 Total number of obs: 3208 Total integrated obs-time: 811921 Average obs-time: 253.1 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: | 751| 279| 274| 132| 125| 126| 87| 102| 78| 70| 120| 110| 101| 139| 107| 75| 98| 75| 359| Average X-band SNRs by baseline | Ft Hh Ho Kb Kk Ma Ny On Wz AVG ------------------------------------------------------ Ft| 41 39 32 31 40 44 38 66 44 Hh| 43 33 - 49 50 41 69 49 Ho| 38 33 33 40 28 46 37 Kb| 49 45 59 40 70 49 Kk| 47 59 41 70 49 Ma| 70 63 102 64 Ny| 73 116 72 On| 98 60 Wz| 87 Average S-band SNRs by baseline | Ft Hh Ho Kb Kk Ma Ny On Wz AVG ------------------------------------------------------ Ft| 24 24 26 31 20 22 19 30 24 Hh| 31 36 - 30 30 26 37 30 Ho| 28 31 21 21 17 24 27 Kb| 63 34 42 31 49 42 Kk| 41 50 37 60 48 Ma| 32 29 43 33 Ny| 34 49 37 On| 44 32 Wz| 44 =========================================================== 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 KASHIM34 KOKEE MATERA 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 Kb KASHIM34 K5 Kk KOKEE Mark5B Ma MATERA Mark5B 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 Kb Kk Ma Ny On Ft Hh Ho Kb Kk Ma Ny On Hh 20 Hh 15 Ho 20 20 Ho 15 15 Kb 20 20 20 Kb 15 15 15 Kk 20 20 20 20 Kk 15 15 15 15 Ma 20 20 20 20 20 Ma 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 ===========================================================