Session Notes for rd2101 Prepared by K. Le Bail, OSO / Chalmers - Onsala, Sweden =========================================================== PURPOSE AND GENERAL NOTES =========================================================== GAIA proposal The session RD2101 will observe a total of 62 optically-bright ICRF3 sources selected from the Gaia Data Release 2 catalog with the following criteria: (i) relatively compact VLBI structure (structure index < 3), (ii) stronger than 0.25 Jy at X and S band, (iii) not observed in any of the IVS sessions during the past 30 days (excluding the intensive sessions), (iv) observed at least 6 times since August 2014 (beginning of the Gaia operations) and with no gap longer than two years. The optical magnitude of the sources ranges from 16.0 to 20.0. The goal is to improve the overall temporal coverage of the observations by IVS of those optically-bright ICRF3 sources during the Gaia operations. The command fill is used with an offset of 10 seconds. Wettzell and Kokee will observe INT I21013 during the time from 1815 UT to 1945 UT. =========================================================== ----- Parameter listing -------------------------------------- Experiment: RD2101 Description R&D-01/2021 Scheduler: OSO Correlator: SHAO Start: 2021-013-18:00:00 End: 2021-014-18:00:00 Current yyyyddd: 2021013 (2021.04) ( 19228 MJD, WED. 13JAN.) Greenwich sidereal time: 01:33:44 (18:00:00 UT) Sun's RA and DEC: 19h 42.6m -21d 20.6 =========================================================== First observations Observation listing from file ./rd2101.skd for experiment RD2101 Source Start DURATIONS name yyddd-hhmmss Hh Ho Kk Km On Wz 0722+145 21013-180000| 77 71 118 100 118| 0834+250 21013-180233| 40 40 40 40| NRAO190 21013-180412| 126 100 126| 1147+245 21013-180511| 57 57 40 | 0954+658 21013-180714| 48 40 40 48| 1101+384 21013-180857| 258 247 235 249 258| 4C39.25 21013-181351| 69 40 69 69| 0823-223 21013-181719| 40 184 184 | End of listing. =========================================================== Last observations Observation listing from file ./rd2101.skd for experiment RD2101 Source Start DURATIONS name yyddd-hhmmss Hh Ho Kk Km On Wz 1034-374 21014-172912| 254 319 319 | 0116-219 21014-173124| 40 235 235| 0607-157 21014-173605| 40 113 98 113| NRAO190 21014-173842| 143 40 113 143| 1459+480 21014-174209| 180 81 160 180| 0507+179 21014-174608| 79 141 156 156| 0406-127 21014-174951| 470 250 470 314| 0743-006 21014-175547| 165 40 165| 0814+425 21014-175917| 33 33 33 33| End of listing. =========================================================== SKED Summary from file ./rd2101.skd for experiment RD2101 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 13.6 Min = 0.0 Max = 96.0 (Baseline Ho-On on 0823-223) RMS = 11.5 Total time: 1440 minutes ( 24.0 hours). Key: Hh=HARTRAO Ho=HOBART26 Kk=KOKEE Km=KUNMING On=ONSALA60 Wz=WETTZELL Hh Ho Kk Km On Wz Avg % obs. time: 34 36 41 40 61 65 46 % cal. time: 3 2 3 4 4 4 3 % slew time: 47 31 14 48 22 10 29 % idle time: 15 30 41 7 12 20 21 total # scans: 248 213 232 381 343 346 293 # scans/hour : 10 9 10 16 14 14 12 Avg scan (sec): 119 146 153 90 153 163 136 # data tracks: 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 Total TB(M5): 3.77 3.98 4.55 4.38 6.70 7.20 5.10 # OF OBSERVATIONS BY BASELINE | Hh Ho Kk Km On Wz Total ---------------------------------------- Hh| 90 0 178 171 183 622 Ho| 95 196 47 59 487 Kk| 167 146 137 545 Km| 216 223 980 On| 317 897 Wz| 919 Number of 2-station scans: 64 Number of 3-station scans: 241 Number of 4-station scans: 193 Number of 5-station scans: 28 Number of 6-station scans: 0 Total number of scans: 526 Total number of obs: 2225 Total integrated obs-time: 245441 Average obs-time: 110.3 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: | 881| 225| 234| 193| 173| 142| 94| 60| 50| 40| 22| 22| 3| 11| 5| 3| 5| 15| 47| Average X-band SNRs by baseline | Hh Ho Kk Km On Wz AVG --------------------------------------- Hh| 87 - 113 81 144 109 Ho| 107 160 68 120 122 Kk| 91 46 79 79 Km| 101 175 130 On| 188 117 Wz| 156 Average S-band SNRs by baseline | Hh Ho Kk Km On Wz AVG --------------------------------------- Hh| 57 - 81 41 66 62 Ho| 87 95 37 57 76 Kk| 102 53 80 81 Km| 58 91 85 On| 73 58 Wz| 76 =========================================================== Recording mode Name Code AOVSX16W SX Recording mode for: HARTRAO HOBART26 KOKEE KUNMING ONSALA60 WETTZELL Mode Tot.Rate #Chan Chan.BW Tot.BW #BBC #bits Tracks*(fan) Tot.tracks Barrel Mk341:1 1024 Mbps 16 16 Mhz 256 Mhz 14 2 32*(1) 32 NONE 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 Hh HARTRAO Mark5B Ho HOBART26 Mark5B Kk KOKEE Mark5B Km KUNMING Mark5B On ONSALA60 17640feet (Thin ) 56250 (HIGH ) 1 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) Hh Ho Kk Km On Hh Ho Kk Km On Ho 20 Ho 15 Kk 20 20 Kk 15 15 Km 20 20 20 Km 15 15 15 On 20 20 20 20 On 15 15 15 15 Wz 20 20 20 20 20 Wz 15 15 15 15 15 ===========================================================