Session Notes for rd1901 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 RD1901, we schedule 24 out of the thirty sources in the astro mode of sked. We use a maxscan value of 480 seconds. We use the sked flux catalog for all sources. We focus on scheduling each source on at least 3 scans. For this reason only 21 of the good geodetic sources are used as base of a stable source set and uniform sky coverage. The command fill is used with an offset of 10 seconds. We use a modified version of the 1Gbps wide-band mode currently used to schedule AOV sessions. Wettzell and Kokee will observe INT I19008 during the time from 1815 UT to 1945 UT. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD1901 Description R&D-01/2019 Scheduler: NASA Correlator: HAYS Start: 2019-008-17:30:00 End: 2019-009-17:30:00 Current yyyyddd: 2019008 (2019.02) ( 18492 MJD, TUES 8JAN.) Greenwich sidereal time: 00:41:54 (17:30:00 UT) Sun's RA and DEC: 19h 18.6m -22d 12.5 =========================================================== First observations Observation listing from file ./rd1901.skd for experiment RD1901 Source Start DURATIONS name yyddd-hhmmss Ft Hh Ho Kb Kk Ma Ny On Wz 0016+731 19008-173000| 50 40 121 50 107 91 121| 0347-211 19008-173321| 158 53 119 160 158 160| OJ287 19008-173337| 208 208 146 | 0322+222 19008-173718| 341 89 195 306 319 341| 0823-223 19008-173833| 40 40 | 0528-250 19008-174157| 146 190 190 | End of listing. =========================================================== Observation listing from file ./rd1901.skd for experiment RD1901 Source Start DURATIONS name yyddd-hhmmss Ft Hh Ho Kb Kk Ma Ny On Wz 2155-304 19009-170833| 295 295 | 0241+622 19009-171101| 480 243 480 221| 1251-197 19009-171109| 268 325 325 | 2318+049 19009-171611| 147 40 181 181| 1333-337 19009-171711| 249 249 | 0312+100 19009-172017| 470 470 470| 0410+110 19009-172141| 298 470 470 | 1741-038 19009-172230| 40 40 | 1751+288 19009-172418| 130 130 | OJ287 19009-172824| 86 86 86 | End of listing. =========================================================== SKED Summary from file ./rd1901.skd for experiment RD1901 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 6.3 Min = 0.0 Max = 65.5 (Baseline Ft-Kk on 2155-304) RMS = 9.3 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: 33 52 53 63 62 66 67 62 69 59 % cal. time: 2 2 2 2 3 3 3 3 3 2 % slew time: 24 38 28 27 15 23 14 17 9 22 % idle time: 40 6 16 7 20 8 16 17 18 17 total # scans: 157 184 191 206 227 235 224 253 236 212 # scans/hour : 7 8 8 9 9 10 9 11 10 9 Avg scan (sec): 184 246 238 264 235 242 259 212 253 236 # 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): 3.70 5.79 5.82 6.97 6.84 7.29 7.42 6.88 7.63 6.48 # OF OBSERVATIONS BY BASELINE | Ft Hh Ho Kb Kk Ma Ny On Wz Total ------------------------------------------------------- Ft| 71 10 8 18 90 50 92 75 414 Hh| 59 31 0 86 55 59 99 460 Ho| 90 104 27 22 13 14 339 Kb| 116 50 76 49 68 488 Kk| 27 62 63 43 433 Ma| 114 180 148 722 Ny| 150 143 672 On| 131 737 Wz| 721 Number of 2-station scans: 213 Number of 3-station scans: 210 Number of 4-station scans: 89 Number of 5-station scans: 63 Number of 6-station scans: 24 Number of 7-station scans: 6 Number of 8-station scans: 0 Number of 9-station scans: 0 Total number of scans: 605 Total number of obs: 2493 Total integrated obs-time: 524888 Average obs-time: 210.5 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: | 605| 200| 186| 129| 93| 51| 94| 87| 77| 96| 98| 102| 66| 58| 65| 33| 81| 57| 315| Average X-band SNRs by baseline | Ft Hh Ho Kb Kk Ma Ny On Wz AVG ------------------------------------------------------ Ft| 57 31 37 33 50 72 50 93 60 Hh| 32 24 - 64 95 69 103 69 Ho| 43 34 40 40 111 43 40 Kb| 50 40 75 52 51 50 Kk| 47 77 45 61 50 Ma| 119 102 156 96 Ny| 129 221 126 On| 167 102 Wz| 139 Average S-band SNRs by baseline | Ft Hh Ho Kb Kk Ma Ny On Wz AVG ------------------------------------------------------ Ft| 30 18 24 33 25 35 25 44 31 Hh| 29 28 - 36 44 37 47 37 Ho| 33 36 25 27 31 25 31 Kb| 50 30 41 30 33 37 Kk| 38 49 35 46 43 Ma| 38 35 47 36 Ny| 39 58 44 On| 51 37 Wz| 48 =========================================================== 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 ===========================================================